* [REVIEW][PATCH 01/22] signal/alpha: Use send_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
@ 2018-04-20 14:37 ` Eric W. Biederman
2018-04-20 14:37 ` [REVIEW][PATCH 02/22] signal/alpha: Use force_sig_fault " Eric W. Biederman
` (20 subsequent siblings)
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:37 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Richard Henderson,
Ivan Kokshaysky, linux-alpha
Filling in struct siginfo before calling send_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper send_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls send_sig_info.
In short about a 5 line reduction in code for every time send_sig_info
is called, which makes the calling function clearer.
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: linux-alpha@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/alpha/kernel/osf_sys.c | 10 ++-----
arch/alpha/kernel/signal.c | 22 +++-----------
arch/alpha/kernel/traps.c | 71 +++++++++++----------------------------------
3 files changed, 24 insertions(+), 79 deletions(-)
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index bb3619118926..6e921754c8fc 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -871,7 +871,6 @@ SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer,
send a signal. Old exceptions are not signaled. */
fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr;
if (fex) {
- siginfo_t info;
int si_code = FPE_FLTUNK;
if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
@@ -881,12 +880,9 @@ SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer,
if (fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV;
if (fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV;
- clear_siginfo(&info);
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_code = si_code;
- info.si_addr = NULL; /* FIXME */
- send_sig_info(SIGFPE, &info, current);
+ send_sig_fault(SIGFPE, si_code,
+ (void __user *)NULL, /* FIXME */
+ 0, current);
}
return 0;
}
diff --git a/arch/alpha/kernel/signal.c b/arch/alpha/kernel/signal.c
index cd306e602313..8c0c4ee0be6e 100644
--- a/arch/alpha/kernel/signal.c
+++ b/arch/alpha/kernel/signal.c
@@ -219,15 +219,8 @@ do_sigreturn(struct sigcontext __user *sc)
/* Send SIGTRAP if we're single-stepping: */
if (ptrace_cancel_bpt (current)) {
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = SIGTRAP;
- info.si_errno = 0;
- info.si_code = TRAP_BRKPT;
- info.si_addr = (void __user *) regs->pc;
- info.si_trapno = 0;
- send_sig_info(SIGTRAP, &info, current);
+ send_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *) regs->pc, 0,
+ current);
}
return;
@@ -254,15 +247,8 @@ do_rt_sigreturn(struct rt_sigframe __user *frame)
/* Send SIGTRAP if we're single-stepping: */
if (ptrace_cancel_bpt (current)) {
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = SIGTRAP;
- info.si_errno = 0;
- info.si_code = TRAP_BRKPT;
- info.si_addr = (void __user *) regs->pc;
- info.si_trapno = 0;
- send_sig_info(SIGTRAP, &info, current);
+ send_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *) regs->pc, 0,
+ current);
}
return;
diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
index 242c83d86ace..106a1692fca0 100644
--- a/arch/alpha/kernel/traps.c
+++ b/arch/alpha/kernel/traps.c
@@ -213,7 +213,6 @@ do_entArith(unsigned long summary, unsigned long write_mask,
struct pt_regs *regs)
{
long si_code = FPE_FLTINV;
- siginfo_t info;
if (summary & 1) {
/* Software-completion summary bit is set, so try to
@@ -228,21 +227,14 @@ do_entArith(unsigned long summary, unsigned long write_mask,
}
die_if_kernel("Arithmetic fault", regs, 0, NULL);
- clear_siginfo(&info);
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_code = si_code;
- info.si_addr = (void __user *) regs->pc;
- send_sig_info(SIGFPE, &info, current);
+ send_sig_fault(SIGFPE, si_code, (void __user *) regs->pc, 0, current);
}
asmlinkage void
do_entIF(unsigned long type, struct pt_regs *regs)
{
- siginfo_t info;
int signo, code;
- clear_siginfo(&info);
if ((regs->ps & ~IPL_MAX) == 0) {
if (type == 1) {
const unsigned int *data
@@ -272,31 +264,20 @@ do_entIF(unsigned long type, struct pt_regs *regs)
switch (type) {
case 0: /* breakpoint */
- info.si_signo = SIGTRAP;
- info.si_errno = 0;
- info.si_code = TRAP_BRKPT;
- info.si_trapno = 0;
- info.si_addr = (void __user *) regs->pc;
-
if (ptrace_cancel_bpt(current)) {
regs->pc -= 4; /* make pc point to former bpt */
}
- send_sig_info(SIGTRAP, &info, current);
+ send_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc, 0,
+ current);
return;
case 1: /* bugcheck */
- info.si_signo = SIGTRAP;
- info.si_errno = 0;
- info.si_code = TRAP_UNK;
- info.si_addr = (void __user *) regs->pc;
- info.si_trapno = 0;
- send_sig_info(SIGTRAP, &info, current);
+ send_sig_fault(SIGTRAP, TRAP_UNK, (void __user *) regs->pc, 0,
+ current);
return;
case 2: /* gentrap */
- info.si_addr = (void __user *) regs->pc;
- info.si_trapno = regs->r16;
switch ((long) regs->r16) {
case GEN_INTOVF:
signo = SIGFPE;
@@ -354,11 +335,8 @@ do_entIF(unsigned long type, struct pt_regs *regs)
break;
}
- info.si_signo = signo;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = (void __user *) regs->pc;
- send_sig_info(signo, &info, current);
+ send_sig_fault(signo, code, (void __user *) regs->pc, regs->r16,
+ current);
return;
case 4: /* opDEC */
@@ -382,11 +360,9 @@ do_entIF(unsigned long type, struct pt_regs *regs)
if (si_code == 0)
return;
if (si_code > 0) {
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_code = si_code;
- info.si_addr = (void __user *) regs->pc;
- send_sig_info(SIGFPE, &info, current);
+ send_sig_fault(SIGFPE, si_code,
+ (void __user *) regs->pc, 0,
+ current);
return;
}
}
@@ -411,11 +387,7 @@ do_entIF(unsigned long type, struct pt_regs *regs)
;
}
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLOPC;
- info.si_addr = (void __user *) regs->pc;
- send_sig_info(SIGILL, &info, current);
+ send_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)regs->pc, 0, current);
}
/* There is an ifdef in the PALcode in MILO that enables a
@@ -761,11 +733,9 @@ do_entUnaUser(void __user * va, unsigned long opcode,
unsigned long tmp1, tmp2, tmp3, tmp4;
unsigned long fake_reg, *reg_addr = &fake_reg;
- siginfo_t info;
+ int si_code;
long error;
- clear_siginfo(&info);
-
/* Check the UAC bits to decide what the user wants us to do
with the unaliged access. */
@@ -986,34 +956,27 @@ do_entUnaUser(void __user * va, unsigned long opcode,
give_sigsegv:
regs->pc -= 4; /* make pc point to faulting insn */
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
/* We need to replicate some of the logic in mm/fault.c,
since we don't have access to the fault code in the
exception handling return path. */
if ((unsigned long)va >= TASK_SIZE)
- info.si_code = SEGV_ACCERR;
+ si_code = SEGV_ACCERR;
else {
struct mm_struct *mm = current->mm;
down_read(&mm->mmap_sem);
if (find_vma(mm, (unsigned long)va))
- info.si_code = SEGV_ACCERR;
+ si_code = SEGV_ACCERR;
else
- info.si_code = SEGV_MAPERR;
+ si_code = SEGV_MAPERR;
up_read(&mm->mmap_sem);
}
- info.si_addr = va;
- send_sig_info(SIGSEGV, &info, current);
+ send_sig_fault(SIGSEGV, si_code, va, 0, current);
return;
give_sigbus:
regs->pc -= 4;
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRALN;
- info.si_addr = va;
- send_sig_info(SIGBUS, &info, current);
+ send_sig_fault(SIGBUS, BUS_ADRALN, va, 0, current);
return;
}
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 02/22] signal/alpha: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
2018-04-20 14:37 ` [REVIEW][PATCH 01/22] signal/alpha: Use send_sig_fault where appropriate Eric W. Biederman
@ 2018-04-20 14:37 ` Eric W. Biederman
2018-04-20 14:37 ` [REVIEW][PATCH 03/22] signal/c6x: " Eric W. Biederman
` (19 subsequent siblings)
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:37 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Richard Henderson,
Ivan Kokshaysky, linux-alpha
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: linux-alpha@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/alpha/kernel/traps.c | 9 +--------
arch/alpha/mm/fault.c | 15 ++-------------
2 files changed, 3 insertions(+), 21 deletions(-)
diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
index 106a1692fca0..bc9627698796 100644
--- a/arch/alpha/kernel/traps.c
+++ b/arch/alpha/kernel/traps.c
@@ -400,16 +400,9 @@ do_entIF(unsigned long type, struct pt_regs *regs)
asmlinkage void
do_entDbg(struct pt_regs *regs)
{
- siginfo_t info;
-
die_if_kernel("Instruction fault", regs, 0, NULL);
- clear_siginfo(&info);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLOPC;
- info.si_addr = (void __user *) regs->pc;
- force_sig_info(SIGILL, &info, current);
+ force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)regs->pc, 0, current);
}
diff --git a/arch/alpha/mm/fault.c b/arch/alpha/mm/fault.c
index 7f2202a9f50a..de2bd217adad 100644
--- a/arch/alpha/mm/fault.c
+++ b/arch/alpha/mm/fault.c
@@ -88,11 +88,8 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
struct mm_struct *mm = current->mm;
const struct exception_table_entry *fixup;
int fault, si_code = SEGV_MAPERR;
- siginfo_t info;
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
- clear_siginfo(&info);
-
/* As of EV6, a load into $31/$f31 is a prefetch, and never faults
(or is suppressed by the PALcode). Support that for older CPUs
by ignoring such an instruction. */
@@ -223,21 +220,13 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
up_read(&mm->mmap_sem);
/* Send a sigbus, regardless of whether we were in kernel
or user mode. */
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void __user *) address;
- force_sig_info(SIGBUS, &info, current);
+ force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *) address, 0, current);
if (!user_mode(regs))
goto no_context;
return;
do_sigsegv:
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = si_code;
- info.si_addr = (void __user *) address;
- force_sig_info(SIGSEGV, &info, current);
+ force_sig_fault(SIGSEGV, si_code, (void __user *) address, 0, current);
return;
#ifdef CONFIG_ALPHA_LARGE_VMALLOC
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 03/22] signal/c6x: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
2018-04-20 14:37 ` [REVIEW][PATCH 01/22] signal/alpha: Use send_sig_fault where appropriate Eric W. Biederman
2018-04-20 14:37 ` [REVIEW][PATCH 02/22] signal/alpha: Use force_sig_fault " Eric W. Biederman
@ 2018-04-20 14:37 ` Eric W. Biederman
2018-04-20 14:37 ` [REVIEW][PATCH 04/22] signal/hexagon: Use force_sig_fault as appropriate Eric W. Biederman
` (18 subsequent siblings)
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:37 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Mark Salter, Aurelien Jacquiot,
linux-c6x-dev
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Mark Salter <msalter@redhat.com>
Cc: Aurelien Jacquiot <jacquiot.aurelien@gmail.com>
Cc: linux-c6x-dev@linux-c6x.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/c6x/kernel/traps.c | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)
diff --git a/arch/c6x/kernel/traps.c b/arch/c6x/kernel/traps.c
index c5feee4542b0..5c60aea3b75a 100644
--- a/arch/c6x/kernel/traps.c
+++ b/arch/c6x/kernel/traps.c
@@ -244,9 +244,7 @@ static struct exception_info eexcept_table[128] = {
static void do_trap(struct exception_info *except_info, struct pt_regs *regs)
{
unsigned long addr = instruction_pointer(regs);
- siginfo_t info;
- clear_siginfo(&info);
if (except_info->code != TRAP_BRKPT)
pr_err("TRAP: %s PC[0x%lx] signo[%d] code[%d]\n",
except_info->kernel_str, regs->pc,
@@ -254,12 +252,8 @@ static void do_trap(struct exception_info *except_info, struct pt_regs *regs)
die_if_kernel(except_info->kernel_str, regs, addr);
- info.si_signo = except_info->signo;
- info.si_errno = 0;
- info.si_code = except_info->code;
- info.si_addr = (void __user *)addr;
-
- force_sig_info(except_info->signo, &info, current);
+ force_sig_fault(except_info->signo, except_info->code,
+ (void __user *)addr, current);
}
/*
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 04/22] signal/hexagon: Use force_sig_fault as appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (2 preceding siblings ...)
2018-04-20 14:37 ` [REVIEW][PATCH 03/22] signal/c6x: " Eric W. Biederman
@ 2018-04-20 14:37 ` Eric W. Biederman
2018-04-20 14:37 ` [REVIEW][PATCH 05/22] signal/m68k: Use force_sig_fault where appropriate Eric W. Biederman
` (17 subsequent siblings)
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:37 UTC (permalink / raw)
To: linux-arch; +Cc: linux-kernel, Eric W. Biederman, Richard Kuo, linux-hexagon
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: linux-hexagon@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/hexagon/kernel/traps.c | 10 ++--------
arch/hexagon/mm/vm_fault.c | 21 +++++++--------------
2 files changed, 9 insertions(+), 22 deletions(-)
diff --git a/arch/hexagon/kernel/traps.c b/arch/hexagon/kernel/traps.c
index 1ff6a6a7b97c..91ee04842c22 100644
--- a/arch/hexagon/kernel/traps.c
+++ b/arch/hexagon/kernel/traps.c
@@ -412,11 +412,6 @@ void do_trap0(struct pt_regs *regs)
case TRAP_DEBUG:
/* Trap0 0xdb is debug breakpoint */
if (user_mode(regs)) {
- struct siginfo info;
-
- clear_siginfo(&info);
- info.si_signo = SIGTRAP;
- info.si_errno = 0;
/*
* Some architecures add some per-thread state
* to distinguish between breakpoint traps and
@@ -424,9 +419,8 @@ void do_trap0(struct pt_regs *regs)
* set the si_code value appropriately, or we
* may want to use a different trap0 flavor.
*/
- info.si_code = TRAP_BRKPT;
- info.si_addr = (void __user *) pt_elr(regs);
- force_sig_info(SIGTRAP, &info, current);
+ force_sig_fault(SIGTRAP, TRAP_BRKPT,
+ (void __user *) pt_elr(regs), current);
} else {
#ifdef CONFIG_KGDB
kgdb_handle_exception(pt_cause(regs), SIGTRAP,
diff --git a/arch/hexagon/mm/vm_fault.c b/arch/hexagon/mm/vm_fault.c
index 2ad92edc877c..933bbcef5363 100644
--- a/arch/hexagon/mm/vm_fault.c
+++ b/arch/hexagon/mm/vm_fault.c
@@ -50,13 +50,12 @@ void do_page_fault(unsigned long address, long cause, struct pt_regs *regs)
{
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
- siginfo_t info;
+ int si_signo;
int si_code = SEGV_MAPERR;
int fault;
const struct exception_table_entry *fixup;
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
- clear_siginfo(&info);
/*
* If we're in an interrupt or have no user context,
* then must not take the fault.
@@ -141,28 +140,22 @@ void do_page_fault(unsigned long address, long cause, struct pt_regs *regs)
* unable to fix up the page fault.
*/
if (fault & VM_FAULT_SIGBUS) {
- info.si_signo = SIGBUS;
- info.si_code = BUS_ADRERR;
+ si_signo = SIGBUS;
+ si_code = BUS_ADRERR;
}
/* Address is not in the memory map */
else {
- info.si_signo = SIGSEGV;
- info.si_code = SEGV_ACCERR;
+ si_signo = SIGSEGV;
+ si_code = SEGV_ACCERR;
}
- info.si_errno = 0;
- info.si_addr = (void __user *)address;
- force_sig_info(info.si_signo, &info, current);
+ force_sig_fault(si_signo, si_code, (void __user *)address, current);
return;
bad_area:
up_read(&mm->mmap_sem);
if (user_mode(regs)) {
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = si_code;
- info.si_addr = (void *)address;
- force_sig_info(info.si_signo, &info, current);
+ force_sig_fault(SIGSEGV, si_code, (void __user *)address, current);
return;
}
/* Kernel-mode fault falls through */
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 05/22] signal/m68k: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (3 preceding siblings ...)
2018-04-20 14:37 ` [REVIEW][PATCH 04/22] signal/hexagon: Use force_sig_fault as appropriate Eric W. Biederman
@ 2018-04-20 14:37 ` Eric W. Biederman
2018-04-20 14:37 ` [REVIEW][PATCH 06/22] signal/microblaze: Remove the commented out force_sig_info in do_page_fault Eric W. Biederman
` (16 subsequent siblings)
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:37 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Geert Uytterhoeven, linux-m68k
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-m68k@lists.linux-m68k.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/m68k/kernel/traps.c | 60 ++++++++++++++++++++----------------------------
arch/m68k/mm/fault.c | 25 +++++++++-----------
2 files changed, 36 insertions(+), 49 deletions(-)
diff --git a/arch/m68k/kernel/traps.c b/arch/m68k/kernel/traps.c
index 0a00b476236d..b2fd000b9285 100644
--- a/arch/m68k/kernel/traps.c
+++ b/arch/m68k/kernel/traps.c
@@ -1007,11 +1007,10 @@ void bad_super_trap (struct frame *fp)
asmlinkage void trap_c(struct frame *fp)
{
- int sig;
+ int sig, si_code;
+ void __user *addr;
int vector = (fp->ptregs.vector >> 2) & 0xff;
- siginfo_t info;
- clear_siginfo(&info);
if (fp->ptregs.sr & PS_S) {
if (vector == VEC_TRACE) {
/* traced a trapping instruction on a 68020/30,
@@ -1030,21 +1029,21 @@ asmlinkage void trap_c(struct frame *fp)
/* send the appropriate signal to the user program */
switch (vector) {
case VEC_ADDRERR:
- info.si_code = BUS_ADRALN;
+ si_code = BUS_ADRALN;
sig = SIGBUS;
break;
case VEC_ILLEGAL:
case VEC_LINE10:
case VEC_LINE11:
- info.si_code = ILL_ILLOPC;
+ si_code = ILL_ILLOPC;
sig = SIGILL;
break;
case VEC_PRIV:
- info.si_code = ILL_PRVOPC;
+ si_code = ILL_PRVOPC;
sig = SIGILL;
break;
case VEC_COPROC:
- info.si_code = ILL_COPROC;
+ si_code = ILL_COPROC;
sig = SIGILL;
break;
case VEC_TRAP1:
@@ -1061,76 +1060,74 @@ asmlinkage void trap_c(struct frame *fp)
case VEC_TRAP12:
case VEC_TRAP13:
case VEC_TRAP14:
- info.si_code = ILL_ILLTRP;
+ si_code = ILL_ILLTRP;
sig = SIGILL;
break;
case VEC_FPBRUC:
case VEC_FPOE:
case VEC_FPNAN:
- info.si_code = FPE_FLTINV;
+ si_code = FPE_FLTINV;
sig = SIGFPE;
break;
case VEC_FPIR:
- info.si_code = FPE_FLTRES;
+ si_code = FPE_FLTRES;
sig = SIGFPE;
break;
case VEC_FPDIVZ:
- info.si_code = FPE_FLTDIV;
+ si_code = FPE_FLTDIV;
sig = SIGFPE;
break;
case VEC_FPUNDER:
- info.si_code = FPE_FLTUND;
+ si_code = FPE_FLTUND;
sig = SIGFPE;
break;
case VEC_FPOVER:
- info.si_code = FPE_FLTOVF;
+ si_code = FPE_FLTOVF;
sig = SIGFPE;
break;
case VEC_ZERODIV:
- info.si_code = FPE_INTDIV;
+ si_code = FPE_INTDIV;
sig = SIGFPE;
break;
case VEC_CHK:
case VEC_TRAP:
- info.si_code = FPE_INTOVF;
+ si_code = FPE_INTOVF;
sig = SIGFPE;
break;
case VEC_TRACE: /* ptrace single step */
- info.si_code = TRAP_TRACE;
+ si_code = TRAP_TRACE;
sig = SIGTRAP;
break;
case VEC_TRAP15: /* breakpoint */
- info.si_code = TRAP_BRKPT;
+ si_code = TRAP_BRKPT;
sig = SIGTRAP;
break;
default:
- info.si_code = ILL_ILLOPC;
+ si_code = ILL_ILLOPC;
sig = SIGILL;
break;
}
- info.si_signo = sig;
- info.si_errno = 0;
switch (fp->ptregs.format) {
default:
- info.si_addr = (void *) fp->ptregs.pc;
+ addr = (void __user *) fp->ptregs.pc;
break;
case 2:
- info.si_addr = (void *) fp->un.fmt2.iaddr;
+ addr = (void __user *) fp->un.fmt2.iaddr;
break;
case 7:
- info.si_addr = (void *) fp->un.fmt7.effaddr;
+ addr = (void __user *) fp->un.fmt7.effaddr;
break;
case 9:
- info.si_addr = (void *) fp->un.fmt9.iaddr;
+ addr = (void __user *) fp->un.fmt9.iaddr;
break;
case 10:
- info.si_addr = (void *) fp->un.fmta.daddr;
+ addr = (void __user *) fp->un.fmta.daddr;
break;
case 11:
- info.si_addr = (void *) fp->un.fmtb.daddr;
+ addr = (void __user*) fp->un.fmtb.daddr;
break;
}
- force_sig_info (sig, &info, current);
+ force_sig_fault(sig, si_code, addr, current);
}
void die_if_kernel (char *str, struct pt_regs *fp, int nr)
@@ -1162,13 +1159,6 @@ asmlinkage void fpsp040_die(void)
#ifdef CONFIG_M68KFPU_EMU
asmlinkage void fpemu_signal(int signal, int code, void *addr)
{
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = signal;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = addr;
- force_sig_info(signal, &info, current);
+ force_sig_fault(signal, code, addr, current);
}
#endif
diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c
index 03253c4f8e6a..f2ff3779875a 100644
--- a/arch/m68k/mm/fault.c
+++ b/arch/m68k/mm/fault.c
@@ -21,35 +21,32 @@ extern void die_if_kernel(char *, struct pt_regs *, long);
int send_fault_sig(struct pt_regs *regs)
{
- siginfo_t siginfo;
+ int signo, si_code;
+ void __user *addr;
- clear_siginfo(&siginfo);
- siginfo.si_signo = current->thread.signo;
- siginfo.si_code = current->thread.code;
- siginfo.si_addr = (void *)current->thread.faddr;
- pr_debug("send_fault_sig: %p,%d,%d\n", siginfo.si_addr,
- siginfo.si_signo, siginfo.si_code);
+ signo = current->thread.signo;
+ si_code = current->thread.code;
+ addr = (void __user *)current->thread.faddr;
+ pr_debug("send_fault_sig: %p,%d,%d\n", addr, signo, si_code);
if (user_mode(regs)) {
- force_sig_info(siginfo.si_signo,
- &siginfo, current);
+ force_sig_fault(signo, si_code, addr, current);
} else {
if (fixup_exception(regs))
return -1;
- //if (siginfo.si_signo == SIGBUS)
- // force_sig_info(siginfo.si_signo,
- // &siginfo, current);
+ //if (signo == SIGBUS)
+ // force_sig_fault(si_signo, si_code, addr, current);
/*
* Oops. The kernel tried to access some bad page. We'll have to
* terminate things with extreme prejudice.
*/
- if ((unsigned long)siginfo.si_addr < PAGE_SIZE)
+ if ((unsigned long)addr < PAGE_SIZE)
pr_alert("Unable to handle kernel NULL pointer dereference");
else
pr_alert("Unable to handle kernel access");
- pr_cont(" at virtual address %p\n", siginfo.si_addr);
+ pr_cont(" at virtual address %p\n", addr);
die_if_kernel("Oops", regs, 0 /*error_code*/);
do_exit(SIGKILL);
}
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 06/22] signal/microblaze: Remove the commented out force_sig_info in do_page_fault
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (4 preceding siblings ...)
2018-04-20 14:37 ` [REVIEW][PATCH 05/22] signal/m68k: Use force_sig_fault where appropriate Eric W. Biederman
@ 2018-04-20 14:37 ` Eric W. Biederman
2018-04-20 14:37 ` [REVIEW][PATCH 07/22] signal/microblaze: Use force_sig_fault where appropriate Eric W. Biederman
` (15 subsequent siblings)
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:37 UTC (permalink / raw)
To: linux-arch; +Cc: linux-kernel, Eric W. Biederman, Michal Simek
Remove the commented out call to force_sig_info right after a call to
_exception in do_page_fault. The function _exception does exactly the
work the commented out code does so there is no reason for the
commented out code.
Cc: Michal Simek <monstr@monstr.eu>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/microblaze/mm/fault.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/arch/microblaze/mm/fault.c b/arch/microblaze/mm/fault.c
index 43d92167012a..1251d380df47 100644
--- a/arch/microblaze/mm/fault.c
+++ b/arch/microblaze/mm/fault.c
@@ -268,11 +268,6 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
/* User mode accesses cause a SIGSEGV */
if (user_mode(regs)) {
_exception(SIGSEGV, regs, code, address);
-/* info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = (void *) address;
- force_sig_info(SIGSEGV, &info, current);*/
return;
}
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 07/22] signal/microblaze: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (5 preceding siblings ...)
2018-04-20 14:37 ` [REVIEW][PATCH 06/22] signal/microblaze: Remove the commented out force_sig_info in do_page_fault Eric W. Biederman
@ 2018-04-20 14:37 ` Eric W. Biederman
2018-04-20 14:37 ` [REVIEW][PATCH 08/22] signal/mips: " Eric W. Biederman
` (14 subsequent siblings)
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:37 UTC (permalink / raw)
To: linux-arch; +Cc: linux-kernel, Eric W. Biederman, Michal Simek
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Michal Simek <monstr@monstr.eu>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/microblaze/kernel/exceptions.c | 9 +--------
arch/microblaze/mm/fault.c | 9 +--------
2 files changed, 2 insertions(+), 16 deletions(-)
diff --git a/arch/microblaze/kernel/exceptions.c b/arch/microblaze/kernel/exceptions.c
index 443ec1feacb4..eafff21fcb0e 100644
--- a/arch/microblaze/kernel/exceptions.c
+++ b/arch/microblaze/kernel/exceptions.c
@@ -60,17 +60,10 @@ asmlinkage void sw_exception(struct pt_regs *regs)
void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
{
- siginfo_t info;
-
if (kernel_mode(regs))
die("Exception in kernel mode", regs, signr);
- clear_siginfo(&info);
- info.si_signo = signr;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = (void __user *) addr;
- force_sig_info(signr, &info, current);
+ force_sig_fault(signr, code, (void __user *)addr, current);
}
asmlinkage void full_exception(struct pt_regs *regs, unsigned int type,
diff --git a/arch/microblaze/mm/fault.c b/arch/microblaze/mm/fault.c
index 1251d380df47..af607447c683 100644
--- a/arch/microblaze/mm/fault.c
+++ b/arch/microblaze/mm/fault.c
@@ -289,14 +289,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
do_sigbus:
up_read(&mm->mmap_sem);
if (user_mode(regs)) {
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void __user *)address;
- force_sig_info(SIGBUS, &info, current);
+ force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, current);
return;
}
bad_page_fault(regs, address, SIGBUS);
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 08/22] signal/mips: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (6 preceding siblings ...)
2018-04-20 14:37 ` [REVIEW][PATCH 07/22] signal/microblaze: Use force_sig_fault where appropriate Eric W. Biederman
@ 2018-04-20 14:37 ` Eric W. Biederman
2018-05-09 15:14 ` Matt Redfearn
2018-04-20 14:37 ` [REVIEW][PATCH 09/22] signal/nds32: " Eric W. Biederman
` (13 subsequent siblings)
21 siblings, 1 reply; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:37 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Ralf Baechle, James Hogan, linux-mips
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@linux-mips.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/mips/kernel/traps.c | 65 ++++++++++++++----------------------------------
arch/mips/mm/fault.c | 19 ++++----------
2 files changed, 23 insertions(+), 61 deletions(-)
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 967e9e4e795e..66ec4b0b484d 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -699,17 +699,11 @@ static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
asmlinkage void do_ov(struct pt_regs *regs)
{
enum ctx_state prev_state;
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = SIGFPE;
- info.si_code = FPE_INTOVF;
- info.si_addr = (void __user *)regs->cp0_epc;
prev_state = exception_enter();
die_if_kernel("Integer overflow", regs);
- force_sig_info(SIGFPE, &info, current);
+ force_sig_fault(SIGFPE, FPE_INTOVF, (void __user *)regs->cp0_epc, current);
exception_exit(prev_state);
}
@@ -722,32 +716,27 @@ asmlinkage void do_ov(struct pt_regs *regs)
void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
struct task_struct *tsk)
{
- struct siginfo si;
-
- clear_siginfo(&si);
- si.si_addr = fault_addr;
- si.si_signo = SIGFPE;
+ int si_code;
if (fcr31 & FPU_CSR_INV_X)
- si.si_code = FPE_FLTINV;
+ si_code = FPE_FLTINV;
else if (fcr31 & FPU_CSR_DIV_X)
- si.si_code = FPE_FLTDIV;
+ si_code = FPE_FLTDIV;
else if (fcr31 & FPU_CSR_OVF_X)
- si.si_code = FPE_FLTOVF;
+ si_code = FPE_FLTOVF;
else if (fcr31 & FPU_CSR_UDF_X)
- si.si_code = FPE_FLTUND;
+ si_code = FPE_FLTUND;
else if (fcr31 & FPU_CSR_INE_X)
- si.si_code = FPE_FLTRES;
+ si_code = FPE_FLTRES;
- force_sig_info(SIGFPE, &si, tsk);
+ force_sig_fault(SIGFPE, si_code, fault_addr, tsk);
}
int process_fpemu_return(int sig, void __user *fault_addr, unsigned long fcr31)
{
- struct siginfo si;
+ int si_code;
struct vm_area_struct *vma;
- clear_siginfo(&si);
switch (sig) {
case 0:
return 0;
@@ -757,23 +746,18 @@ int process_fpemu_return(int sig, void __user *fault_addr, unsigned long fcr31)
return 1;
case SIGBUS:
- si.si_addr = fault_addr;
- si.si_signo = sig;
- si.si_code = BUS_ADRERR;
- force_sig_info(sig, &si, current);
+ force_sig_fault(SIGBUS, BUS_ADRERR, fault_addr, current);
return 1;
case SIGSEGV:
- si.si_addr = fault_addr;
- si.si_signo = sig;
down_read(¤t->mm->mmap_sem);
vma = find_vma(current->mm, (unsigned long)fault_addr);
if (vma && (vma->vm_start <= (unsigned long)fault_addr))
- si.si_code = SEGV_ACCERR;
+ si_code = SEGV_ACCERR;
else
- si.si_code = SEGV_MAPERR;
+ si_code = SEGV_MAPERR;
up_read(¤t->mm->mmap_sem);
- force_sig_info(sig, &si, current);
+ force_sig_fault(SIGSEGV, si_code, fault_addr, current);
return 1;
default:
@@ -896,10 +880,8 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
void do_trap_or_bp(struct pt_regs *regs, unsigned int code, int si_code,
const char *str)
{
- siginfo_t info;
char b[40];
- clear_siginfo(&info);
#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
if (kgdb_ll_trap(DIE_TRAP, str, regs, code, current->thread.trap_nr,
SIGTRAP) == NOTIFY_STOP)
@@ -921,13 +903,9 @@ void do_trap_or_bp(struct pt_regs *regs, unsigned int code, int si_code,
case BRK_DIVZERO:
scnprintf(b, sizeof(b), "%s instruction in kernel code", str);
die_if_kernel(b, regs);
- if (code == BRK_DIVZERO)
- info.si_code = FPE_INTDIV;
- else
- info.si_code = FPE_INTOVF;
- info.si_signo = SIGFPE;
- info.si_addr = (void __user *) regs->cp0_epc;
- force_sig_info(SIGFPE, &info, current);
+ force_sig_fault(SIGFPE,
+ code == BRK_DIVZERO ? FPE_INTDIV : FPE_INTOVF,
+ (void __user *) regs->cp0_epc, current);
break;
case BRK_BUG:
die_if_kernel("Kernel bug detected", regs);
@@ -952,9 +930,7 @@ void do_trap_or_bp(struct pt_regs *regs, unsigned int code, int si_code,
scnprintf(b, sizeof(b), "%s instruction in kernel code", str);
die_if_kernel(b, regs);
if (si_code) {
- info.si_signo = SIGTRAP;
- info.si_code = si_code;
- force_sig_info(SIGTRAP, &info, current);
+ force_sig_fault(SIGTRAP, si_code, NULL, current);
} else {
force_sig(SIGTRAP, current);
}
@@ -1506,13 +1482,8 @@ asmlinkage void do_mdmx(struct pt_regs *regs)
*/
asmlinkage void do_watch(struct pt_regs *regs)
{
- siginfo_t info;
enum ctx_state prev_state;
- clear_siginfo(&info);
- info.si_signo = SIGTRAP;
- info.si_code = TRAP_HWBKPT;
-
prev_state = exception_enter();
/*
* Clear WP (bit 22) bit of cause register so we don't loop
@@ -1528,7 +1499,7 @@ asmlinkage void do_watch(struct pt_regs *regs)
if (test_tsk_thread_flag(current, TIF_LOAD_WATCH)) {
mips_read_watch_registers();
local_irq_enable();
- force_sig_info(SIGTRAP, &info, current);
+ force_sig_fault(SIGTRAP, TRAP_HWBKPT, NULL, current);
} else {
mips_clear_watch_registers();
local_irq_enable();
diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index 75392becd933..5f71f2b903b7 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -42,7 +42,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
struct task_struct *tsk = current;
struct mm_struct *mm = tsk->mm;
const int field = sizeof(unsigned long) * 2;
- siginfo_t info;
+ int si_code;
int fault;
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
@@ -63,8 +63,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
return;
#endif
- clear_siginfo(&info);
- info.si_code = SEGV_MAPERR;
+ si_code = SEGV_MAPERR;
/*
* We fault-in kernel-space virtual memory on-demand. The
@@ -113,7 +112,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
* we can handle it..
*/
good_area:
- info.si_code = SEGV_ACCERR;
+ si_code = SEGV_ACCERR;
if (write) {
if (!(vma->vm_flags & VM_WRITE))
@@ -224,11 +223,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
pr_cont("\n");
}
current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- /* info.si_code has been set above */
- info.si_addr = (void __user *) address;
- force_sig_info(SIGSEGV, &info, tsk);
+ force_sig_fault(SIGSEGV, si_code, (void __user *)address, tsk);
return;
}
@@ -284,11 +279,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
#endif
current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
tsk->thread.cp0_badvaddr = address;
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void __user *) address;
- force_sig_info(SIGBUS, &info, tsk);
+ force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, tsk);
return;
#ifndef CONFIG_64BIT
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 08/22] signal/mips: Use force_sig_fault where appropriate
2018-04-20 14:37 ` [REVIEW][PATCH 08/22] signal/mips: " Eric W. Biederman
@ 2018-05-09 15:14 ` Matt Redfearn
2018-05-10 2:39 ` Eric W. Biederman
0 siblings, 1 reply; 77+ messages in thread
From: Matt Redfearn @ 2018-05-09 15:14 UTC (permalink / raw)
To: Eric W. Biederman, linux-arch
Cc: linux-kernel, Ralf Baechle, James Hogan, linux-mips
Hi Eric,
On 20/04/18 15:37, Eric W. Biederman wrote:
> Filling in struct siginfo before calling force_sig_info a tedious and
> error prone process, where once in a great while the wrong fields
> are filled out, and siginfo has been inconsistently cleared.
>
> Simplify this process by using the helper force_sig_fault. Which
> takes as a parameters all of the information it needs, ensures
> all of the fiddly bits of filling in struct siginfo are done properly
> and then calls force_sig_info.
>
> In short about a 5 line reduction in code for every time force_sig_info
> is called, which makes the calling function clearer.
>
> Cc: Ralf Baechle <ralf@linux-mips.org>
> Cc: James Hogan <jhogan@kernel.org>
> Cc: linux-mips@linux-mips.org
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
> ---
> arch/mips/kernel/traps.c | 65 ++++++++++++++----------------------------------
> arch/mips/mm/fault.c | 19 ++++----------
> 2 files changed, 23 insertions(+), 61 deletions(-)
>
> diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
> index 967e9e4e795e..66ec4b0b484d 100644
> --- a/arch/mips/kernel/traps.c
> +++ b/arch/mips/kernel/traps.c
> @@ -699,17 +699,11 @@ static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
> asmlinkage void do_ov(struct pt_regs *regs)
> {
> enum ctx_state prev_state;
> - siginfo_t info;
> -
> - clear_siginfo(&info);
> - info.si_signo = SIGFPE;
> - info.si_code = FPE_INTOVF;
> - info.si_addr = (void __user *)regs->cp0_epc;
>
> prev_state = exception_enter();
> die_if_kernel("Integer overflow", regs);
>
> - force_sig_info(SIGFPE, &info, current);
> + force_sig_fault(SIGFPE, FPE_INTOVF, (void __user *)regs->cp0_epc, current);
> exception_exit(prev_state);
> }
>
> @@ -722,32 +716,27 @@ asmlinkage void do_ov(struct pt_regs *regs)
> void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
> struct task_struct *tsk)
> {
> - struct siginfo si;
> -
> - clear_siginfo(&si);
> - si.si_addr = fault_addr;
> - si.si_signo = SIGFPE;
> + int si_code;
This is giving build errors in Linux next
(https://storage.kernelci.org/next/master/next-20180509/mips/defconfig+kselftest/build.log)
si_code would have ended up as 0 before from the clear_siginfo(), but
perhaps
int si_code = FPE_FLTUNK;
Would make a more sensible default?
Thanks,
Matt
>
> if (fcr31 & FPU_CSR_INV_X)
> - si.si_code = FPE_FLTINV;
> + si_code = FPE_FLTINV;
> else if (fcr31 & FPU_CSR_DIV_X)
> - si.si_code = FPE_FLTDIV;
> + si_code = FPE_FLTDIV;
> else if (fcr31 & FPU_CSR_OVF_X)
> - si.si_code = FPE_FLTOVF;
> + si_code = FPE_FLTOVF;
> else if (fcr31 & FPU_CSR_UDF_X)
> - si.si_code = FPE_FLTUND;
> + si_code = FPE_FLTUND;
> else if (fcr31 & FPU_CSR_INE_X)
> - si.si_code = FPE_FLTRES;
> + si_code = FPE_FLTRES;
>
> - force_sig_info(SIGFPE, &si, tsk);
> + force_sig_fault(SIGFPE, si_code, fault_addr, tsk);
> }
>
> int process_fpemu_return(int sig, void __user *fault_addr, unsigned long fcr31)
> {
> - struct siginfo si;
> + int si_code;
> struct vm_area_struct *vma;
>
> - clear_siginfo(&si);
> switch (sig) {
> case 0:
> return 0;
> @@ -757,23 +746,18 @@ int process_fpemu_return(int sig, void __user *fault_addr, unsigned long fcr31)
> return 1;
>
> case SIGBUS:
> - si.si_addr = fault_addr;
> - si.si_signo = sig;
> - si.si_code = BUS_ADRERR;
> - force_sig_info(sig, &si, current);
> + force_sig_fault(SIGBUS, BUS_ADRERR, fault_addr, current);
> return 1;
>
> case SIGSEGV:
> - si.si_addr = fault_addr;
> - si.si_signo = sig;
> down_read(¤t->mm->mmap_sem);
> vma = find_vma(current->mm, (unsigned long)fault_addr);
> if (vma && (vma->vm_start <= (unsigned long)fault_addr))
> - si.si_code = SEGV_ACCERR;
> + si_code = SEGV_ACCERR;
> else
> - si.si_code = SEGV_MAPERR;
> + si_code = SEGV_MAPERR;
> up_read(¤t->mm->mmap_sem);
> - force_sig_info(sig, &si, current);
> + force_sig_fault(SIGSEGV, si_code, fault_addr, current);
> return 1;
>
> default:
> @@ -896,10 +880,8 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
> void do_trap_or_bp(struct pt_regs *regs, unsigned int code, int si_code,
> const char *str)
> {
> - siginfo_t info;
> char b[40];
>
> - clear_siginfo(&info);
> #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
> if (kgdb_ll_trap(DIE_TRAP, str, regs, code, current->thread.trap_nr,
> SIGTRAP) == NOTIFY_STOP)
> @@ -921,13 +903,9 @@ void do_trap_or_bp(struct pt_regs *regs, unsigned int code, int si_code,
> case BRK_DIVZERO:
> scnprintf(b, sizeof(b), "%s instruction in kernel code", str);
> die_if_kernel(b, regs);
> - if (code == BRK_DIVZERO)
> - info.si_code = FPE_INTDIV;
> - else
> - info.si_code = FPE_INTOVF;
> - info.si_signo = SIGFPE;
> - info.si_addr = (void __user *) regs->cp0_epc;
> - force_sig_info(SIGFPE, &info, current);
> + force_sig_fault(SIGFPE,
> + code == BRK_DIVZERO ? FPE_INTDIV : FPE_INTOVF,
> + (void __user *) regs->cp0_epc, current);
> break;
> case BRK_BUG:
> die_if_kernel("Kernel bug detected", regs);
> @@ -952,9 +930,7 @@ void do_trap_or_bp(struct pt_regs *regs, unsigned int code, int si_code,
> scnprintf(b, sizeof(b), "%s instruction in kernel code", str);
> die_if_kernel(b, regs);
> if (si_code) {
> - info.si_signo = SIGTRAP;
> - info.si_code = si_code;
> - force_sig_info(SIGTRAP, &info, current);
> + force_sig_fault(SIGTRAP, si_code, NULL, current);
> } else {
> force_sig(SIGTRAP, current);
> }
> @@ -1506,13 +1482,8 @@ asmlinkage void do_mdmx(struct pt_regs *regs)
> */
> asmlinkage void do_watch(struct pt_regs *regs)
> {
> - siginfo_t info;
> enum ctx_state prev_state;
>
> - clear_siginfo(&info);
> - info.si_signo = SIGTRAP;
> - info.si_code = TRAP_HWBKPT;
> -
> prev_state = exception_enter();
> /*
> * Clear WP (bit 22) bit of cause register so we don't loop
> @@ -1528,7 +1499,7 @@ asmlinkage void do_watch(struct pt_regs *regs)
> if (test_tsk_thread_flag(current, TIF_LOAD_WATCH)) {
> mips_read_watch_registers();
> local_irq_enable();
> - force_sig_info(SIGTRAP, &info, current);
> + force_sig_fault(SIGTRAP, TRAP_HWBKPT, NULL, current);
> } else {
> mips_clear_watch_registers();
> local_irq_enable();
> diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
> index 75392becd933..5f71f2b903b7 100644
> --- a/arch/mips/mm/fault.c
> +++ b/arch/mips/mm/fault.c
> @@ -42,7 +42,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
> struct task_struct *tsk = current;
> struct mm_struct *mm = tsk->mm;
> const int field = sizeof(unsigned long) * 2;
> - siginfo_t info;
> + int si_code;
> int fault;
> unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
>
> @@ -63,8 +63,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
> return;
> #endif
>
> - clear_siginfo(&info);
> - info.si_code = SEGV_MAPERR;
> + si_code = SEGV_MAPERR;
>
> /*
> * We fault-in kernel-space virtual memory on-demand. The
> @@ -113,7 +112,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
> * we can handle it..
> */
> good_area:
> - info.si_code = SEGV_ACCERR;
> + si_code = SEGV_ACCERR;
>
> if (write) {
> if (!(vma->vm_flags & VM_WRITE))
> @@ -224,11 +223,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
> pr_cont("\n");
> }
> current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
> - info.si_signo = SIGSEGV;
> - info.si_errno = 0;
> - /* info.si_code has been set above */
> - info.si_addr = (void __user *) address;
> - force_sig_info(SIGSEGV, &info, tsk);
> + force_sig_fault(SIGSEGV, si_code, (void __user *)address, tsk);
> return;
> }
>
> @@ -284,11 +279,7 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
> #endif
> current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
> tsk->thread.cp0_badvaddr = address;
> - info.si_signo = SIGBUS;
> - info.si_errno = 0;
> - info.si_code = BUS_ADRERR;
> - info.si_addr = (void __user *) address;
> - force_sig_info(SIGBUS, &info, tsk);
> + force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, tsk);
>
> return;
> #ifndef CONFIG_64BIT
>
^ permalink raw reply [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 08/22] signal/mips: Use force_sig_fault where appropriate
2018-05-09 15:14 ` Matt Redfearn
@ 2018-05-10 2:39 ` Eric W. Biederman
2018-05-10 7:59 ` Matt Redfearn
0 siblings, 1 reply; 77+ messages in thread
From: Eric W. Biederman @ 2018-05-10 2:39 UTC (permalink / raw)
To: Matt Redfearn
Cc: linux-arch, linux-kernel, Ralf Baechle, James Hogan, linux-mips
Matt Redfearn <matt.redfearn@mips.com> writes:
> Hi Eric,
>
> On 20/04/18 15:37, Eric W. Biederman wrote:
>> Filling in struct siginfo before calling force_sig_info a tedious and
>> error prone process, where once in a great while the wrong fields
>> are filled out, and siginfo has been inconsistently cleared.
>>
>> Simplify this process by using the helper force_sig_fault. Which
>> takes as a parameters all of the information it needs, ensures
>> all of the fiddly bits of filling in struct siginfo are done properly
>> and then calls force_sig_info.
>>
>> In short about a 5 line reduction in code for every time force_sig_info
>> is called, which makes the calling function clearer.
>>
>> Cc: Ralf Baechle <ralf@linux-mips.org>
>> Cc: James Hogan <jhogan@kernel.org>
>> Cc: linux-mips@linux-mips.org
>> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
>> ---
>> arch/mips/kernel/traps.c | 65 ++++++++++++++----------------------------------
>> arch/mips/mm/fault.c | 19 ++++----------
>> 2 files changed, 23 insertions(+), 61 deletions(-)
>>
>> diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
>> index 967e9e4e795e..66ec4b0b484d 100644
>> --- a/arch/mips/kernel/traps.c
>> +++ b/arch/mips/kernel/traps.c
>> @@ -699,17 +699,11 @@ static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
>> asmlinkage void do_ov(struct pt_regs *regs)
>> {
>> enum ctx_state prev_state;
>> - siginfo_t info;
>> -
>> - clear_siginfo(&info);
>> - info.si_signo = SIGFPE;
>> - info.si_code = FPE_INTOVF;
>> - info.si_addr = (void __user *)regs->cp0_epc;
>> prev_state = exception_enter();
>> die_if_kernel("Integer overflow", regs);
>> - force_sig_info(SIGFPE, &info, current);
>> + force_sig_fault(SIGFPE, FPE_INTOVF, (void __user *)regs->cp0_epc, current);
>> exception_exit(prev_state);
>> }
>> @@ -722,32 +716,27 @@ asmlinkage void do_ov(struct pt_regs *regs)
>> void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
>> struct task_struct *tsk)
>> {
>> - struct siginfo si;
>> -
>> - clear_siginfo(&si);
>> - si.si_addr = fault_addr;
>> - si.si_signo = SIGFPE;
>> + int si_code;
>
> This is giving build errors in Linux next
> (https://storage.kernelci.org/next/master/next-20180509/mips/defconfig+kselftest/build.log)
>
> si_code would have ended up as 0 before from the clear_siginfo(), but perhaps
And si_code 0 is not a valid si_code to use with a floating point
siginfo layout.
> int si_code = FPE_FLTUNK;
>
> Would make a more sensible default?
FPE_FLTUNK would make a more sensible default.
I seem to remember someone telling me that case can never happen in
practice so I have simply not worried about it. Perhaps I am
misremembering this.
Eric
^ permalink raw reply [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 08/22] signal/mips: Use force_sig_fault where appropriate
2018-05-10 2:39 ` Eric W. Biederman
@ 2018-05-10 7:59 ` Matt Redfearn
2018-05-11 2:31 ` Eric W. Biederman
0 siblings, 1 reply; 77+ messages in thread
From: Matt Redfearn @ 2018-05-10 7:59 UTC (permalink / raw)
To: Eric W. Biederman
Cc: linux-arch, linux-kernel, Ralf Baechle, James Hogan, linux-mips
Hi Eric,
On 10/05/18 03:39, Eric W. Biederman wrote:
> Matt Redfearn <matt.redfearn@mips.com> writes:
>
>> Hi Eric,
>>
>> On 20/04/18 15:37, Eric W. Biederman wrote:
>>> Filling in struct siginfo before calling force_sig_info a tedious and
>>> error prone process, where once in a great while the wrong fields
>>> are filled out, and siginfo has been inconsistently cleared.
>>>
>>> Simplify this process by using the helper force_sig_fault. Which
>>> takes as a parameters all of the information it needs, ensures
>>> all of the fiddly bits of filling in struct siginfo are done properly
>>> and then calls force_sig_info.
>>>
>>> In short about a 5 line reduction in code for every time force_sig_info
>>> is called, which makes the calling function clearer.
>>>
>>> Cc: Ralf Baechle <ralf@linux-mips.org>
>>> Cc: James Hogan <jhogan@kernel.org>
>>> Cc: linux-mips@linux-mips.org
>>> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
>>> ---
>>> arch/mips/kernel/traps.c | 65 ++++++++++++++----------------------------------
>>> arch/mips/mm/fault.c | 19 ++++----------
>>> 2 files changed, 23 insertions(+), 61 deletions(-)
>>>
>>> diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
>>> index 967e9e4e795e..66ec4b0b484d 100644
>>> --- a/arch/mips/kernel/traps.c
>>> +++ b/arch/mips/kernel/traps.c
>>> @@ -699,17 +699,11 @@ static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
>>> asmlinkage void do_ov(struct pt_regs *regs)
>>> {
>>> enum ctx_state prev_state;
>>> - siginfo_t info;
>>> -
>>> - clear_siginfo(&info);
>>> - info.si_signo = SIGFPE;
>>> - info.si_code = FPE_INTOVF;
>>> - info.si_addr = (void __user *)regs->cp0_epc;
>>> prev_state = exception_enter();
>>> die_if_kernel("Integer overflow", regs);
>>> - force_sig_info(SIGFPE, &info, current);
>>> + force_sig_fault(SIGFPE, FPE_INTOVF, (void __user *)regs->cp0_epc, current);
>>> exception_exit(prev_state);
>>> }
>>> @@ -722,32 +716,27 @@ asmlinkage void do_ov(struct pt_regs *regs)
>>> void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
>>> struct task_struct *tsk)
>>> {
>>> - struct siginfo si;
>>> -
>>> - clear_siginfo(&si);
>>> - si.si_addr = fault_addr;
>>> - si.si_signo = SIGFPE;
>>> + int si_code;
>>
>> This is giving build errors in Linux next
>> (https://storage.kernelci.org/next/master/next-20180509/mips/defconfig+kselftest/build.log)
>>
>> si_code would have ended up as 0 before from the clear_siginfo(), but perhaps
>
> And si_code 0 is not a valid si_code to use with a floating point
> siginfo layout.
>
>> int si_code = FPE_FLTUNK;
>>
>> Would make a more sensible default?
>
> FPE_FLTUNK would make a more sensible default.
>
> I seem to remember someone telling me that case can never happen in
> practice so I have simply not worried about it. Perhaps I am
> misremembering this.
It probably can't happen in practise - but the issue is that the kernel
doesn't even compile because -Werror=maybe-uninitialized results in a
build error since the compiler can't know that one of the branches will
definitely be taken to set si_code.
Thanks,
Matt
>
> Eric
>
^ permalink raw reply [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 08/22] signal/mips: Use force_sig_fault where appropriate
2018-05-10 7:59 ` Matt Redfearn
@ 2018-05-11 2:31 ` Eric W. Biederman
0 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-05-11 2:31 UTC (permalink / raw)
To: Matt Redfearn
Cc: linux-arch, linux-kernel, Ralf Baechle, James Hogan, linux-mips
Matt Redfearn <matt.redfearn@mips.com> writes:
> Hi Eric,
>
> On 10/05/18 03:39, Eric W. Biederman wrote:
>> Matt Redfearn <matt.redfearn@mips.com> writes:
>>
>>> Hi Eric,
>>>
>>> On 20/04/18 15:37, Eric W. Biederman wrote:
>>>> Filling in struct siginfo before calling force_sig_info a tedious and
>>>> error prone process, where once in a great while the wrong fields
>>>> are filled out, and siginfo has been inconsistently cleared.
>>>>
>>>> Simplify this process by using the helper force_sig_fault. Which
>>>> takes as a parameters all of the information it needs, ensures
>>>> all of the fiddly bits of filling in struct siginfo are done properly
>>>> and then calls force_sig_info.
>>>>
>>>> In short about a 5 line reduction in code for every time force_sig_info
>>>> is called, which makes the calling function clearer.
>>>>
>>>> Cc: Ralf Baechle <ralf@linux-mips.org>
>>>> Cc: James Hogan <jhogan@kernel.org>
>>>> Cc: linux-mips@linux-mips.org
>>>> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
>>>> ---
>>>> arch/mips/kernel/traps.c | 65 ++++++++++++++----------------------------------
>>>> arch/mips/mm/fault.c | 19 ++++----------
>>>> 2 files changed, 23 insertions(+), 61 deletions(-)
>>>>
>>>> diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
>>>> index 967e9e4e795e..66ec4b0b484d 100644
>>>> --- a/arch/mips/kernel/traps.c
>>>> +++ b/arch/mips/kernel/traps.c
>>>> @@ -699,17 +699,11 @@ static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
>>>> asmlinkage void do_ov(struct pt_regs *regs)
>>>> {
>>>> enum ctx_state prev_state;
>>>> - siginfo_t info;
>>>> -
>>>> - clear_siginfo(&info);
>>>> - info.si_signo = SIGFPE;
>>>> - info.si_code = FPE_INTOVF;
>>>> - info.si_addr = (void __user *)regs->cp0_epc;
>>>> prev_state = exception_enter();
>>>> die_if_kernel("Integer overflow", regs);
>>>> - force_sig_info(SIGFPE, &info, current);
>>>> + force_sig_fault(SIGFPE, FPE_INTOVF, (void __user *)regs->cp0_epc, current);
>>>> exception_exit(prev_state);
>>>> }
>>>> @@ -722,32 +716,27 @@ asmlinkage void do_ov(struct pt_regs *regs)
>>>> void force_fcr31_sig(unsigned long fcr31, void __user *fault_addr,
>>>> struct task_struct *tsk)
>>>> {
>>>> - struct siginfo si;
>>>> -
>>>> - clear_siginfo(&si);
>>>> - si.si_addr = fault_addr;
>>>> - si.si_signo = SIGFPE;
>>>> + int si_code;
>>>
>>> This is giving build errors in Linux next
>>> (https://storage.kernelci.org/next/master/next-20180509/mips/defconfig+kselftest/build.log)
>>>
>>> si_code would have ended up as 0 before from the clear_siginfo(), but perhaps
>>
>> And si_code 0 is not a valid si_code to use with a floating point
>> siginfo layout.
>>
>>> int si_code = FPE_FLTUNK;
>>>
>>> Would make a more sensible default?
>>
>> FPE_FLTUNK would make a more sensible default.
>>
>> I seem to remember someone telling me that case can never happen in
>> practice so I have simply not worried about it. Perhaps I am
>> misremembering this.
>
> It probably can't happen in practise - but the issue is that the
> kernel doesn't even compile because -Werror=maybe-uninitialized
> results in a build error since the compiler can't know that one of the
> branches will definitely be taken to set si_code.
My cross compile work. So I don't know where that
-Werror=maybe-unitialized comes from.
I agree it is an issue. I agree that FPE_FLTUNK is one of the good
solutions. Another is to add a final else where you return without
doing anything.
Right now this looks like mips people issue that I have unearthed.
I could appreciate some guidance on which way mips folks would like to
handle this.
If you can point me to where the fatal error is coming from I will
definitely do something in my tree so that this is not a harmful issue.
Eric
^ permalink raw reply [flat|nested] 77+ messages in thread
* [REVIEW][PATCH 09/22] signal/nds32: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (7 preceding siblings ...)
2018-04-20 14:37 ` [REVIEW][PATCH 08/22] signal/mips: " Eric W. Biederman
@ 2018-04-20 14:37 ` Eric W. Biederman
2018-04-25 11:29 ` Vincent Chen
2018-04-20 14:37 ` [REVIEW][PATCH 10/22] signal/nios2: " Eric W. Biederman
` (12 subsequent siblings)
21 siblings, 1 reply; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:37 UTC (permalink / raw)
To: linux-arch; +Cc: linux-kernel, Eric W. Biederman, Greentime Hu, Vincent Chen
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/nds32/kernel/traps.c | 20 ++++----------------
arch/nds32/mm/fault.c | 19 +++++--------------
2 files changed, 9 insertions(+), 30 deletions(-)
diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
index 46911768f4b5..636d1c7aa895 100644
--- a/arch/nds32/kernel/traps.c
+++ b/arch/nds32/kernel/traps.c
@@ -222,20 +222,13 @@ void die_if_kernel(const char *str, struct pt_regs *regs, int err)
int bad_syscall(int n, struct pt_regs *regs)
{
- siginfo_t info;
-
if (current->personality != PER_LINUX) {
send_sig(SIGSEGV, current, 1);
return regs->uregs[0];
}
- clear_siginfo(&info);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLTRP;
- info.si_addr = (void __user *)instruction_pointer(regs) - 4;
-
- force_sig_info(SIGILL, &info, current);
+ force_sig_fault(SIGILL, ILL_ILLTRP,
+ (void __user *)instruction_pointer(regs) - 4, current);
die_if_kernel("Oops - bad syscall", regs, n);
return regs->uregs[0];
}
@@ -288,16 +281,11 @@ void __init early_trap_init(void)
void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
int error_code, int si_code)
{
- struct siginfo info;
-
tsk->thread.trap_no = ENTRY_DEBUG_RELATED;
tsk->thread.error_code = error_code;
- clear_siginfo(&info);
- info.si_signo = SIGTRAP;
- info.si_code = si_code;
- info.si_addr = (void __user *)instruction_pointer(regs);
- force_sig_info(SIGTRAP, &info, tsk);
+ force_sig_fault(SIGTRAP, si_code
+ (void __user *)instruction_pointer(regs), tsk);
}
void do_debug_trap(unsigned long entry, unsigned long addr,
diff --git a/arch/nds32/mm/fault.c b/arch/nds32/mm/fault.c
index 876ee01ff80a..9bdb7c3ecbb6 100644
--- a/arch/nds32/mm/fault.c
+++ b/arch/nds32/mm/fault.c
@@ -72,16 +72,15 @@ void do_page_fault(unsigned long entry, unsigned long addr,
struct task_struct *tsk;
struct mm_struct *mm;
struct vm_area_struct *vma;
- siginfo_t info;
+ int si_code;
int fault;
unsigned int mask = VM_READ | VM_WRITE | VM_EXEC;
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
- clear_siginfo(&info);
error_code = error_code & (ITYPE_mskINST | ITYPE_mskETYPE);
tsk = current;
mm = tsk->mm;
- info.si_code = SEGV_MAPERR;
+ si_code = SEGV_MAPERR;
/*
* We fault-in kernel-space virtual memory on-demand. The
* 'reference' page table is init_mm.pgd.
@@ -162,7 +161,7 @@ void do_page_fault(unsigned long entry, unsigned long addr,
*/
good_area:
- info.si_code = SEGV_ACCERR;
+ si_code = SEGV_ACCERR;
/* first do some preliminary protection checks */
if (entry == ENTRY_PTE_NOT_PRESENT) {
@@ -267,11 +266,7 @@ void do_page_fault(unsigned long entry, unsigned long addr,
tsk->thread.address = addr;
tsk->thread.error_code = error_code;
tsk->thread.trap_no = entry;
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- /* info.si_code has been set above */
- info.si_addr = (void *)addr;
- force_sig_info(SIGSEGV, &info, tsk);
+ force_sig_fault(SIGSEGV, si_code, (void __user *)addr, tsk);
return;
}
@@ -340,11 +335,7 @@ void do_page_fault(unsigned long entry, unsigned long addr,
tsk->thread.address = addr;
tsk->thread.error_code = error_code;
tsk->thread.trap_no = entry;
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void *)addr;
- force_sig_info(SIGBUS, &info, tsk);
+ force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)addr, tsk);
return;
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 09/22] signal/nds32: Use force_sig_fault where appropriate
2018-04-20 14:37 ` [REVIEW][PATCH 09/22] signal/nds32: " Eric W. Biederman
@ 2018-04-25 11:29 ` Vincent Chen
2018-04-25 15:57 ` Eric W. Biederman
0 siblings, 1 reply; 77+ messages in thread
From: Vincent Chen @ 2018-04-25 11:29 UTC (permalink / raw)
To: Eric W. Biederman; +Cc: linux-arch, Linux Kernel Mailing List, Greentime Hu
2018-04-20 22:37 GMT+08:00 Eric W. Biederman <ebiederm@xmission.com>:
> Filling in struct siginfo before calling force_sig_info a tedious and
> error prone process, where once in a great while the wrong fields
> are filled out, and siginfo has been inconsistently cleared.
>
> Simplify this process by using the helper force_sig_fault. Which
> takes as a parameters all of the information it needs, ensures
> all of the fiddly bits of filling in struct siginfo are done properly
> and then calls force_sig_info.
>
> In short about a 5 line reduction in code for every time force_sig_info
> is called, which makes the calling function clearer.
>
> Cc: Greentime Hu <green.hu@gmail.com>
> Cc: Vincent Chen <deanbo422@gmail.com>
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
> ---
> arch/nds32/kernel/traps.c | 20 ++++----------------
> arch/nds32/mm/fault.c | 19 +++++--------------
> 2 files changed, 9 insertions(+), 30 deletions(-)
>
> diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
> index 46911768f4b5..636d1c7aa895 100644
> --- a/arch/nds32/kernel/traps.c
> +++ b/arch/nds32/kernel/traps.c
> @@ -222,20 +222,13 @@ void die_if_kernel(const char *str, struct pt_regs *regs, int err)
>
> int bad_syscall(int n, struct pt_regs *regs)
> {
> - siginfo_t info;
> -
> if (current->personality != PER_LINUX) {
> send_sig(SIGSEGV, current, 1);
> return regs->uregs[0];
> }
>
> - clear_siginfo(&info);
> - info.si_signo = SIGILL;
> - info.si_errno = 0;
> - info.si_code = ILL_ILLTRP;
> - info.si_addr = (void __user *)instruction_pointer(regs) - 4;
> -
> - force_sig_info(SIGILL, &info, current);
> + force_sig_fault(SIGILL, ILL_ILLTRP,
> + (void __user *)instruction_pointer(regs) - 4, current);
> die_if_kernel("Oops - bad syscall", regs, n);
> return regs->uregs[0];
> }
> @@ -288,16 +281,11 @@ void __init early_trap_init(void)
> void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
> int error_code, int si_code)
> {
> - struct siginfo info;
> -
> tsk->thread.trap_no = ENTRY_DEBUG_RELATED;
> tsk->thread.error_code = error_code;
>
> - clear_siginfo(&info);
> - info.si_signo = SIGTRAP;
> - info.si_code = si_code;
> - info.si_addr = (void __user *)instruction_pointer(regs);
> - force_sig_info(SIGTRAP, &info, tsk);
> + force_sig_fault(SIGTRAP, si_code
> + (void __user *)instruction_pointer(regs), tsk);
> }
>
I found a comma is missing after argument si_code.
> void do_debug_trap(unsigned long entry, unsigned long addr,
> diff --git a/arch/nds32/mm/fault.c b/arch/nds32/mm/fault.c
> index 876ee01ff80a..9bdb7c3ecbb6 100644
> --- a/arch/nds32/mm/fault.c
> +++ b/arch/nds32/mm/fault.c
> @@ -72,16 +72,15 @@ void do_page_fault(unsigned long entry, unsigned long addr,
> struct task_struct *tsk;
> struct mm_struct *mm;
> struct vm_area_struct *vma;
> - siginfo_t info;
> + int si_code;
> int fault;
> unsigned int mask = VM_READ | VM_WRITE | VM_EXEC;
> unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
>
> - clear_siginfo(&info);
> error_code = error_code & (ITYPE_mskINST | ITYPE_mskETYPE);
> tsk = current;
> mm = tsk->mm;
> - info.si_code = SEGV_MAPERR;
> + si_code = SEGV_MAPERR;
> /*
> * We fault-in kernel-space virtual memory on-demand. The
> * 'reference' page table is init_mm.pgd.
> @@ -162,7 +161,7 @@ void do_page_fault(unsigned long entry, unsigned long addr,
> */
>
> good_area:
> - info.si_code = SEGV_ACCERR;
> + si_code = SEGV_ACCERR;
>
> /* first do some preliminary protection checks */
> if (entry == ENTRY_PTE_NOT_PRESENT) {
> @@ -267,11 +266,7 @@ void do_page_fault(unsigned long entry, unsigned long addr,
> tsk->thread.address = addr;
> tsk->thread.error_code = error_code;
> tsk->thread.trap_no = entry;
> - info.si_signo = SIGSEGV;
> - info.si_errno = 0;
> - /* info.si_code has been set above */
> - info.si_addr = (void *)addr;
> - force_sig_info(SIGSEGV, &info, tsk);
> + force_sig_fault(SIGSEGV, si_code, (void __user *)addr, tsk);
> return;
> }
>
> @@ -340,11 +335,7 @@ void do_page_fault(unsigned long entry, unsigned long addr,
> tsk->thread.address = addr;
> tsk->thread.error_code = error_code;
> tsk->thread.trap_no = entry;
> - info.si_signo = SIGBUS;
> - info.si_errno = 0;
> - info.si_code = BUS_ADRERR;
> - info.si_addr = (void *)addr;
> - force_sig_info(SIGBUS, &info, tsk);
> + force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)addr, tsk);
>
> return;
>
> --
> 2.14.1
>
Except the missing comma in send_sigtrap(), I think this patch for nds32 is OK.
Vincent Chen
^ permalink raw reply [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 09/22] signal/nds32: Use force_sig_fault where appropriate
2018-04-25 11:29 ` Vincent Chen
@ 2018-04-25 15:57 ` Eric W. Biederman
2018-04-26 1:24 ` Greentime Hu
0 siblings, 1 reply; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-25 15:57 UTC (permalink / raw)
To: Vincent Chen; +Cc: linux-arch, Linux Kernel Mailing List, Greentime Hu
Vincent Chen <deanbo422@gmail.com> writes:
> 2018-04-20 22:37 GMT+08:00 Eric W. Biederman <ebiederm@xmission.com>:
>> Filling in struct siginfo before calling force_sig_info a tedious and
>> error prone process, where once in a great while the wrong fields
>> are filled out, and siginfo has been inconsistently cleared.
>>
>> Simplify this process by using the helper force_sig_fault. Which
>> takes as a parameters all of the information it needs, ensures
>> all of the fiddly bits of filling in struct siginfo are done properly
>> and then calls force_sig_info.
>>
>> In short about a 5 line reduction in code for every time force_sig_info
>> is called, which makes the calling function clearer.
>>
>> Cc: Greentime Hu <green.hu@gmail.com>
>> Cc: Vincent Chen <deanbo422@gmail.com>
>> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
>> ---
>> arch/nds32/kernel/traps.c | 20 ++++----------------
>> arch/nds32/mm/fault.c | 19 +++++--------------
>> 2 files changed, 9 insertions(+), 30 deletions(-)
>>
>> diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
>> index 46911768f4b5..636d1c7aa895 100644
>> --- a/arch/nds32/kernel/traps.c
>> +++ b/arch/nds32/kernel/traps.c
>> @@ -222,20 +222,13 @@ void die_if_kernel(const char *str, struct pt_regs *regs, int err)
>>
>> int bad_syscall(int n, struct pt_regs *regs)
>> {
>> - siginfo_t info;
>> -
>> if (current->personality != PER_LINUX) {
>> send_sig(SIGSEGV, current, 1);
>> return regs->uregs[0];
>> }
>>
>> - clear_siginfo(&info);
>> - info.si_signo = SIGILL;
>> - info.si_errno = 0;
>> - info.si_code = ILL_ILLTRP;
>> - info.si_addr = (void __user *)instruction_pointer(regs) - 4;
>> -
>> - force_sig_info(SIGILL, &info, current);
>> + force_sig_fault(SIGILL, ILL_ILLTRP,
>> + (void __user *)instruction_pointer(regs) - 4, current);
>> die_if_kernel("Oops - bad syscall", regs, n);
>> return regs->uregs[0];
>> }
>> @@ -288,16 +281,11 @@ void __init early_trap_init(void)
>> void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
>> int error_code, int si_code)
>> {
>> - struct siginfo info;
>> -
>> tsk->thread.trap_no = ENTRY_DEBUG_RELATED;
>> tsk->thread.error_code = error_code;
>>
>> - clear_siginfo(&info);
>> - info.si_signo = SIGTRAP;
>> - info.si_code = si_code;
>> - info.si_addr = (void __user *)instruction_pointer(regs);
>> - force_sig_info(SIGTRAP, &info, tsk);
>> + force_sig_fault(SIGTRAP, si_code
>> + (void __user *)instruction_pointer(regs), tsk);
>> }
>>
>
> I found a comma is missing after argument si_code.
Good catch. Fixed.
Unfortunately the only compiler I have for nds32 is my eyeballs so
this slipped through. Grr.
> Except the missing comma in send_sigtrap(), I think this patch for nds32 is OK.
>
I have corrected the change as you suggested and have added your Acked
by.
Eric
^ permalink raw reply [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 09/22] signal/nds32: Use force_sig_fault where appropriate
2018-04-25 15:57 ` Eric W. Biederman
@ 2018-04-26 1:24 ` Greentime Hu
0 siblings, 0 replies; 77+ messages in thread
From: Greentime Hu @ 2018-04-26 1:24 UTC (permalink / raw)
To: Eric W. Biederman; +Cc: Vincent Chen, linux-arch, Linux Kernel Mailing List
2018-04-25 23:57 GMT+08:00 Eric W. Biederman <ebiederm@xmission.com>:
> Vincent Chen <deanbo422@gmail.com> writes:
>
>> 2018-04-20 22:37 GMT+08:00 Eric W. Biederman <ebiederm@xmission.com>:
>>> Filling in struct siginfo before calling force_sig_info a tedious and
>>> error prone process, where once in a great while the wrong fields
>>> are filled out, and siginfo has been inconsistently cleared.
>>>
>>> Simplify this process by using the helper force_sig_fault. Which
>>> takes as a parameters all of the information it needs, ensures
>>> all of the fiddly bits of filling in struct siginfo are done properly
>>> and then calls force_sig_info.
>>>
>>> In short about a 5 line reduction in code for every time force_sig_info
>>> is called, which makes the calling function clearer.
>>>
>>> Cc: Greentime Hu <green.hu@gmail.com>
>>> Cc: Vincent Chen <deanbo422@gmail.com>
>>> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
>>> ---
>>> arch/nds32/kernel/traps.c | 20 ++++----------------
>>> arch/nds32/mm/fault.c | 19 +++++--------------
>>> 2 files changed, 9 insertions(+), 30 deletions(-)
>>>
>>> diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
>>> index 46911768f4b5..636d1c7aa895 100644
>>> --- a/arch/nds32/kernel/traps.c
>>> +++ b/arch/nds32/kernel/traps.c
>>> @@ -222,20 +222,13 @@ void die_if_kernel(const char *str, struct pt_regs *regs, int err)
>>>
>>> int bad_syscall(int n, struct pt_regs *regs)
>>> {
>>> - siginfo_t info;
>>> -
>>> if (current->personality != PER_LINUX) {
>>> send_sig(SIGSEGV, current, 1);
>>> return regs->uregs[0];
>>> }
>>>
>>> - clear_siginfo(&info);
>>> - info.si_signo = SIGILL;
>>> - info.si_errno = 0;
>>> - info.si_code = ILL_ILLTRP;
>>> - info.si_addr = (void __user *)instruction_pointer(regs) - 4;
>>> -
>>> - force_sig_info(SIGILL, &info, current);
>>> + force_sig_fault(SIGILL, ILL_ILLTRP,
>>> + (void __user *)instruction_pointer(regs) - 4, current);
>>> die_if_kernel("Oops - bad syscall", regs, n);
>>> return regs->uregs[0];
>>> }
>>> @@ -288,16 +281,11 @@ void __init early_trap_init(void)
>>> void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
>>> int error_code, int si_code)
>>> {
>>> - struct siginfo info;
>>> -
>>> tsk->thread.trap_no = ENTRY_DEBUG_RELATED;
>>> tsk->thread.error_code = error_code;
>>>
>>> - clear_siginfo(&info);
>>> - info.si_signo = SIGTRAP;
>>> - info.si_code = si_code;
>>> - info.si_addr = (void __user *)instruction_pointer(regs);
>>> - force_sig_info(SIGTRAP, &info, tsk);
>>> + force_sig_fault(SIGTRAP, si_code
>>> + (void __user *)instruction_pointer(regs), tsk);
>>> }
>>>
>>
>> I found a comma is missing after argument si_code.
>
> Good catch. Fixed.
>
> Unfortunately the only compiler I have for nds32 is my eyeballs so
> this slipped through. Grr.
>
>
Sorry for that. Our nds32 toolchain upstreaming is on-going.
You may try this one. It is able to build defconfig and allnoconfig
https://lkml.org/lkml/2018/4/17/395
https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/6.4.0/x86_64-gcc-6.4.0-nolibc-nds32le-linux.tar.xz
or this one with glibc support
https://github.com/andestech/build_script.git
https://github.com/greentime/prebuilt-nds32-toolchain/releases
^ permalink raw reply [flat|nested] 77+ messages in thread
* [REVIEW][PATCH 10/22] signal/nios2: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (8 preceding siblings ...)
2018-04-20 14:37 ` [REVIEW][PATCH 09/22] signal/nds32: " Eric W. Biederman
@ 2018-04-20 14:37 ` Eric W. Biederman
2018-04-20 14:38 ` [REVIEW][PATCH 11/22] signal/openrisc: " Eric W. Biederman
` (11 subsequent siblings)
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:37 UTC (permalink / raw)
To: linux-arch; +Cc: linux-kernel, Eric W. Biederman, Ley Foon Tan, nios2-dev
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Ley Foon Tan <lftan@altera.com>
Cc: nios2-dev@lists.rocketboards.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/nios2/kernel/traps.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
diff --git a/arch/nios2/kernel/traps.c b/arch/nios2/kernel/traps.c
index a69861d3e1a3..3bc3cd22b750 100644
--- a/arch/nios2/kernel/traps.c
+++ b/arch/nios2/kernel/traps.c
@@ -26,14 +26,7 @@ static DEFINE_SPINLOCK(die_lock);
static void _send_sig(int signo, int code, unsigned long addr)
{
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = signo;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = (void __user *) addr;
- force_sig_info(signo, &info, current);
+ force_sig_fault(signo, code, (void __user *) addr, current);
}
void die(const char *str, struct pt_regs *regs, long err)
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 11/22] signal/openrisc: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (9 preceding siblings ...)
2018-04-20 14:37 ` [REVIEW][PATCH 10/22] signal/nios2: " Eric W. Biederman
@ 2018-04-20 14:38 ` Eric W. Biederman
2018-04-20 14:38 ` [REVIEW][PATCH 12/22] signal/parisc: Use force_sig_mceerr " Eric W. Biederman
` (10 subsequent siblings)
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:38 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Jonas Bonn, Stefan Kristiansson,
Stafford Horne, openrisc
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Stafford Horne <shorne@gmail.com>
Cc: openrisc@lists.librecores.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/openrisc/kernel/traps.c | 33 ++++-----------------------------
arch/openrisc/mm/fault.c | 19 +++++--------------
2 files changed, 9 insertions(+), 43 deletions(-)
diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c
index 1610b1d65a11..fac246e6f37a 100644
--- a/arch/openrisc/kernel/traps.c
+++ b/arch/openrisc/kernel/traps.c
@@ -250,28 +250,16 @@ void __init trap_init(void)
asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
{
- siginfo_t info;
- clear_siginfo(&info);
- info.si_signo = SIGTRAP;
- info.si_code = TRAP_TRACE;
- info.si_addr = (void *)address;
- force_sig_info(SIGTRAP, &info, current);
+ force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)address, current);
regs->pc += 4;
}
asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
{
- siginfo_t info;
-
if (user_mode(regs)) {
/* Send a SIGBUS */
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRALN;
- info.si_addr = (void __user *)address;
- force_sig_info(SIGBUS, &info, current);
+ force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address, current);
} else {
printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
show_registers(regs);
@@ -282,16 +270,9 @@ asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
{
- siginfo_t info;
-
if (user_mode(regs)) {
/* Send a SIGBUS */
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void *)address;
- force_sig_info(SIGBUS, &info, current);
+ force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, current);
} else { /* Kernel mode */
printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
show_registers(regs);
@@ -466,7 +447,6 @@ static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
asmlinkage void do_illegal_instruction(struct pt_regs *regs,
unsigned long address)
{
- siginfo_t info;
unsigned int op;
unsigned int insn = *((unsigned int *)address);
@@ -487,12 +467,7 @@ asmlinkage void do_illegal_instruction(struct pt_regs *regs,
if (user_mode(regs)) {
/* Send a SIGILL */
- clear_siginfo(&info);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLOPC;
- info.si_addr = (void *)address;
- force_sig_info(SIGBUS, &info, current);
+ force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address, current);
} else { /* Kernel mode */
printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
address);
diff --git a/arch/openrisc/mm/fault.c b/arch/openrisc/mm/fault.c
index 68be33e4ae17..9f011d16cc46 100644
--- a/arch/openrisc/mm/fault.c
+++ b/arch/openrisc/mm/fault.c
@@ -52,11 +52,10 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
struct task_struct *tsk;
struct mm_struct *mm;
struct vm_area_struct *vma;
- siginfo_t info;
+ int si_code;
int fault;
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
- clear_siginfo(&info);
tsk = current;
/*
@@ -98,7 +97,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
}
mm = tsk->mm;
- info.si_code = SEGV_MAPERR;
+ si_code = SEGV_MAPERR;
/*
* If we're in an interrupt or have no user
@@ -140,7 +139,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
*/
good_area:
- info.si_code = SEGV_ACCERR;
+ si_code = SEGV_ACCERR;
/* first do some preliminary protection checks */
@@ -214,11 +213,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
/* User mode accesses just cause a SIGSEGV */
if (user_mode(regs)) {
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- /* info.si_code has been set above */
- info.si_addr = (void *)address;
- force_sig_info(SIGSEGV, &info, tsk);
+ force_sig_fault(SIGSEGV, si_code, (void __user *)address, tsk);
return;
}
@@ -283,11 +278,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long address,
* Send a sigbus, regardless of whether we were in kernel
* or user mode.
*/
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void *)address;
- force_sig_info(SIGBUS, &info, tsk);
+ force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, tsk);
/* Kernel mode? Handle exceptions or die */
if (!user_mode(regs))
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 12/22] signal/parisc: Use force_sig_mceerr where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (10 preceding siblings ...)
2018-04-20 14:38 ` [REVIEW][PATCH 11/22] signal/openrisc: " Eric W. Biederman
@ 2018-04-20 14:38 ` Eric W. Biederman
2018-04-20 14:38 ` [REVIEW][PATCH 13/22] signal/parisc: Use force_sig_fault " Eric W. Biederman
` (9 subsequent siblings)
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:38 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, James Bottomley, Helge Deller,
linux-parisc
In do_page_fault where an mceerr is generated stop and call force_sig_mceerr.
Keeping the mcerr handling logic out of the force_sig_info call below.
This ensures that only and always in the mcerr case is lsb interesting.
This ensures setting set si_lsb in the future won't accidentally
stomp another siginfo field in the non mcerr case.
Cc: James Bottomley <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-parisc@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/parisc/mm/fault.c | 30 +++++++++++++++---------------
1 file changed, 15 insertions(+), 15 deletions(-)
diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c
index 657b35096bd8..51215b0048ef 100644
--- a/arch/parisc/mm/fault.c
+++ b/arch/parisc/mm/fault.c
@@ -354,7 +354,6 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
if (user_mode(regs)) {
struct siginfo si;
- unsigned int lsb = 0;
clear_siginfo(&si);
switch (code) {
@@ -391,26 +390,27 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
#ifdef CONFIG_MEMORY_FAILURE
if (fault & (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) {
+ unsigned int lsb = 0;
printk(KERN_ERR
"MCE: Killing %s:%d due to hardware memory corruption fault at %08lx\n",
tsk->comm, tsk->pid, address);
- si.si_signo = SIGBUS;
- si.si_code = BUS_MCEERR_AR;
+ /*
+ * Either small page or large page may be poisoned.
+ * In other words, VM_FAULT_HWPOISON_LARGE and
+ * VM_FAULT_HWPOISON are mutually exclusive.
+ */
+ if (fault & VM_FAULT_HWPOISON_LARGE)
+ lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));
+ else if (fault & VM_FAULT_HWPOISON)
+ lsb = PAGE_SHIFT;
+
+ force_sig_mceerr(BUS_MCEERR_AR, (void __user *) address,
+ lsb, current);
+ return;
}
#endif
- /*
- * Either small page or large page may be poisoned.
- * In other words, VM_FAULT_HWPOISON_LARGE and
- * VM_FAULT_HWPOISON are mutually exclusive.
- */
- if (fault & VM_FAULT_HWPOISON_LARGE)
- lsb = hstate_index_to_shift(VM_FAULT_GET_HINDEX(fault));
- else if (fault & VM_FAULT_HWPOISON)
- lsb = PAGE_SHIFT;
- else
- show_signal_msg(regs, code, address, tsk, vma);
- si.si_addr_lsb = lsb;
+ show_signal_msg(regs, code, address, tsk, vma);
si.si_errno = 0;
si.si_addr = (void __user *) address;
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 13/22] signal/parisc: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (11 preceding siblings ...)
2018-04-20 14:38 ` [REVIEW][PATCH 12/22] signal/parisc: Use force_sig_mceerr " Eric W. Biederman
@ 2018-04-20 14:38 ` Eric W. Biederman
2018-04-21 17:24 ` Helge Deller
2018-04-20 14:38 ` [REVIEW][PATCH 14/22] signal/riscv: " Eric W. Biederman
` (8 subsequent siblings)
21 siblings, 1 reply; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:38 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, James Bottomley, Helge Deller,
linux-parisc
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: James Bottomley <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-parisc@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/parisc/kernel/ptrace.c | 11 ++------
arch/parisc/kernel/traps.c | 63 ++++++++++++++----------------------------
arch/parisc/kernel/unaligned.c | 16 +++--------
arch/parisc/math-emu/driver.c | 9 ++----
arch/parisc/mm/fault.c | 25 +++++++----------
5 files changed, 39 insertions(+), 85 deletions(-)
diff --git a/arch/parisc/kernel/ptrace.c b/arch/parisc/kernel/ptrace.c
index b1c12ceb1c88..7aa1d4d0d444 100644
--- a/arch/parisc/kernel/ptrace.c
+++ b/arch/parisc/kernel/ptrace.c
@@ -76,8 +76,6 @@ void user_enable_single_step(struct task_struct *task)
set_tsk_thread_flag(task, TIF_SINGLESTEP);
if (pa_psw(task)->n) {
- struct siginfo si;
-
/* Nullified, just crank over the queue. */
task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1];
task_regs(task)->iasq[0] = task_regs(task)->iasq[1];
@@ -90,12 +88,9 @@ void user_enable_single_step(struct task_struct *task)
ptrace_disable(task);
/* Don't wake up the task, but let the
parent know something happened. */
- clear_siginfo(&si);
- si.si_code = TRAP_TRACE;
- si.si_addr = (void __user *) (task_regs(task)->iaoq[0] & ~3);
- si.si_signo = SIGTRAP;
- si.si_errno = 0;
- force_sig_info(SIGTRAP, &si, task);
+ force_sig_fault(SIGTRAP, TRAP_TRACE,
+ (void __user *) (task_regs(task)->iaoq[0] & ~3),
+ task);
/* notify_parent(task, SIGCHLD); */
return;
}
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 98f9f2f85940..132b09c657ff 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -297,14 +297,8 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
#define GDB_BREAK_INSN 0x10004
static void handle_gdb_break(struct pt_regs *regs, int wot)
{
- struct siginfo si;
-
- clear_siginfo(&si);
- si.si_signo = SIGTRAP;
- si.si_errno = 0;
- si.si_code = wot;
- si.si_addr = (void __user *) (regs->iaoq[0] & ~3);
- force_sig_info(SIGTRAP, &si, current);
+ force_sig_fault(SIGTRAP, wot,
+ (void __user *) (regs->iaoq[0] & ~3), current);
}
static void handle_break(struct pt_regs *regs)
@@ -488,9 +482,8 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
{
unsigned long fault_address = 0;
unsigned long fault_space = 0;
- struct siginfo si;
+ int si_code;
- clear_siginfo(&si);
if (code == 1)
pdc_console_restart(); /* switch back to pdc if HPMC */
else
@@ -573,7 +566,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
case 8:
/* Illegal instruction trap */
die_if_kernel("Illegal instruction", regs, code);
- si.si_code = ILL_ILLOPC;
+ si_code = ILL_ILLOPC;
goto give_sigill;
case 9:
@@ -584,7 +577,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
case 10:
/* Privileged operation trap */
die_if_kernel("Privileged operation", regs, code);
- si.si_code = ILL_PRVOPC;
+ si_code = ILL_PRVOPC;
goto give_sigill;
case 11:
@@ -607,20 +600,16 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
}
die_if_kernel("Privileged register usage", regs, code);
- si.si_code = ILL_PRVREG;
+ si_code = ILL_PRVREG;
give_sigill:
- si.si_signo = SIGILL;
- si.si_errno = 0;
- si.si_addr = (void __user *) regs->iaoq[0];
- force_sig_info(SIGILL, &si, current);
+ force_sig_fault(SIGILL, si_code,
+ (void __user *) regs->iaoq[0], current);
return;
case 12:
/* Overflow Trap, let the userland signal handler do the cleanup */
- si.si_signo = SIGFPE;
- si.si_code = FPE_INTOVF;
- si.si_addr = (void __user *) regs->iaoq[0];
- force_sig_info(SIGFPE, &si, current);
+ force_sig_fault(SIGFPE, FPE_INTOVF,
+ (void __user *) regs->iaoq[0], current);
return;
case 13:
@@ -628,13 +617,11 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
The condition succeeds in an instruction which traps
on condition */
if(user_mode(regs)){
- si.si_signo = SIGFPE;
/* Let userspace app figure it out from the insn pointed
* to by si_addr.
*/
- si.si_code = FPE_CONDTRAP;
- si.si_addr = (void __user *) regs->iaoq[0];
- force_sig_info(SIGFPE, &si, current);
+ force_sig_fault(SIGFPE, FPE_CONDTRAP,
+ (void __user *) regs->iaoq[0], current);
return;
}
/* The kernel doesn't want to handle condition codes */
@@ -743,14 +730,10 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
return;
die_if_kernel("Protection id trap", regs, code);
- si.si_code = SEGV_MAPERR;
- si.si_signo = SIGSEGV;
- si.si_errno = 0;
- if (code == 7)
- si.si_addr = (void __user *) regs->iaoq[0];
- else
- si.si_addr = (void __user *) regs->ior;
- force_sig_info(SIGSEGV, &si, current);
+ force_sig_fault(SIGSEGV, SEGV_MAPERR,
+ (code == 7)?
+ ((void __user *) regs->iaoq[0]) :
+ ((void __user *) regs->ior), current);
return;
case 28:
@@ -764,11 +747,8 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
"handle_interruption() pid=%d command='%s'\n",
task_pid_nr(current), current->comm);
/* SIGBUS, for lack of a better one. */
- si.si_signo = SIGBUS;
- si.si_code = BUS_OBJERR;
- si.si_errno = 0;
- si.si_addr = (void __user *) regs->ior;
- force_sig_info(SIGBUS, &si, current);
+ force_sig_fault(SIGBUS, BUS_OBJERR,
+ (void __user *)regs->ior, current);
return;
}
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
@@ -783,11 +763,8 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
"User fault %d on space 0x%08lx, pid=%d command='%s'\n",
code, fault_space,
task_pid_nr(current), current->comm);
- si.si_signo = SIGSEGV;
- si.si_errno = 0;
- si.si_code = SEGV_MAPERR;
- si.si_addr = (void __user *) regs->ior;
- force_sig_info(SIGSEGV, &si, current);
+ force_sig_fault(SIGSEGV, SEGV_MAPERR,
+ (void __user *)regs->ior, current);
return;
}
}
diff --git a/arch/parisc/kernel/unaligned.c b/arch/parisc/kernel/unaligned.c
index 30b7c7f6c471..932bfc0b7cd8 100644
--- a/arch/parisc/kernel/unaligned.c
+++ b/arch/parisc/kernel/unaligned.c
@@ -452,10 +452,8 @@ void handle_unaligned(struct pt_regs *regs)
unsigned long newbase = R1(regs->iir)?regs->gr[R1(regs->iir)]:0;
int modify = 0;
int ret = ERR_NOTHANDLED;
- struct siginfo si;
register int flop=0; /* true if this is a flop */
- clear_siginfo(&si);
__inc_irq_stat(irq_unaligned_count);
/* log a message with pacing */
@@ -691,21 +689,15 @@ void handle_unaligned(struct pt_regs *regs)
if (ret == ERR_PAGEFAULT)
{
- si.si_signo = SIGSEGV;
- si.si_errno = 0;
- si.si_code = SEGV_MAPERR;
- si.si_addr = (void __user *)regs->ior;
- force_sig_info(SIGSEGV, &si, current);
+ force_sig_fault(SIGSEGV, SEGV_MAPERR,
+ (void __user *)regs->ior, current);
}
else
{
force_sigbus:
/* couldn't handle it ... */
- si.si_signo = SIGBUS;
- si.si_errno = 0;
- si.si_code = BUS_ADRALN;
- si.si_addr = (void __user *)regs->ior;
- force_sig_info(SIGBUS, &si, current);
+ force_sig_fault(SIGBUS, BUS_ADRALN,
+ (void __user *)regs->ior, current);
}
return;
diff --git a/arch/parisc/math-emu/driver.c b/arch/parisc/math-emu/driver.c
index 0d10efb53361..0590e05571d1 100644
--- a/arch/parisc/math-emu/driver.c
+++ b/arch/parisc/math-emu/driver.c
@@ -81,7 +81,6 @@ int
handle_fpe(struct pt_regs *regs)
{
extern void printbinary(unsigned long x, int nbits);
- struct siginfo si;
unsigned int orig_sw, sw;
int signalcode;
/* need an intermediate copy of float regs because FPU emulation
@@ -93,7 +92,6 @@ handle_fpe(struct pt_regs *regs)
*/
__u64 frcopy[36];
- clear_siginfo(&si);
memcpy(frcopy, regs->fr, sizeof regs->fr);
frcopy[32] = 0;
@@ -118,11 +116,8 @@ handle_fpe(struct pt_regs *regs)
memcpy(regs->fr, frcopy, sizeof regs->fr);
if (signalcode != 0) {
- si.si_signo = signalcode >> 24;
- si.si_errno = 0;
- si.si_code = signalcode & 0xffffff;
- si.si_addr = (void __user *) regs->iaoq[0];
- force_sig_info(si.si_signo, &si, current);
+ force_sig_fault(signalcode >> 24, signalcode & 0xffffff,
+ (void __user *) regs->iaoq[0], current);
return -1;
}
diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c
index 51215b0048ef..a80117980fc2 100644
--- a/arch/parisc/mm/fault.c
+++ b/arch/parisc/mm/fault.c
@@ -353,23 +353,22 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
up_read(&mm->mmap_sem);
if (user_mode(regs)) {
- struct siginfo si;
+ int signo, si_code;
- clear_siginfo(&si);
switch (code) {
case 15: /* Data TLB miss fault/Data page fault */
/* send SIGSEGV when outside of vma */
if (!vma ||
address < vma->vm_start || address >= vma->vm_end) {
- si.si_signo = SIGSEGV;
- si.si_code = SEGV_MAPERR;
+ signo = SIGSEGV;
+ si_code = SEGV_MAPERR;
break;
}
/* send SIGSEGV for wrong permissions */
if ((vma->vm_flags & acc_type) != acc_type) {
- si.si_signo = SIGSEGV;
- si.si_code = SEGV_ACCERR;
+ signo = SIGSEGV;
+ si_code = SEGV_ACCERR;
break;
}
@@ -377,17 +376,16 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
/* fall through */
case 17: /* NA data TLB miss / page fault */
case 18: /* Unaligned access - PCXS only */
- si.si_signo = SIGBUS;
- si.si_code = (code == 18) ? BUS_ADRALN : BUS_ADRERR;
+ signo = SIGBUS;
+ si_code = (code == 18) ? BUS_ADRALN : BUS_ADRERR;
break;
case 16: /* Non-access instruction TLB miss fault */
case 26: /* PCXL: Data memory access rights trap */
default:
- si.si_signo = SIGSEGV;
- si.si_code = (code == 26) ? SEGV_ACCERR : SEGV_MAPERR;
+ signo = SIGSEGV;
+ si_code = (code == 26) ? SEGV_ACCERR : SEGV_MAPERR;
break;
}
-
#ifdef CONFIG_MEMORY_FAILURE
if (fault & (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) {
unsigned int lsb = 0;
@@ -409,12 +407,9 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
return;
}
#endif
-
show_signal_msg(regs, code, address, tsk, vma);
- si.si_errno = 0;
- si.si_addr = (void __user *) address;
- force_sig_info(si.si_signo, &si, current);
+ force_sig_fault(signo, si_code, (void __user *) address, current);
return;
}
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 13/22] signal/parisc: Use force_sig_fault where appropriate
2018-04-20 14:38 ` [REVIEW][PATCH 13/22] signal/parisc: Use force_sig_fault " Eric W. Biederman
@ 2018-04-21 17:24 ` Helge Deller
0 siblings, 0 replies; 77+ messages in thread
From: Helge Deller @ 2018-04-21 17:24 UTC (permalink / raw)
To: Eric W. Biederman, linux-arch; +Cc: linux-kernel, James Bottomley, linux-parisc
On 20.04.2018 16:38, Eric W. Biederman wrote:
> Filling in struct siginfo before calling force_sig_info a tedious and
> error prone process, where once in a great while the wrong fields
> are filled out, and siginfo has been inconsistently cleared.
>
> Simplify this process by using the helper force_sig_fault. Which
> takes as a parameters all of the information it needs, ensures
> all of the fiddly bits of filling in struct siginfo are done properly
> and then calls force_sig_info.
>
> In short about a 5 line reduction in code for every time force_sig_info
> is called, which makes the calling function clearer.
>
> Cc: James Bottomley <jejb@parisc-linux.org>
> Cc: Helge Deller <deller@gmx.de>
> Cc: linux-parisc@vger.kernel.org
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
I pulled this whole patch series from your git tree and
booted it on 32- and 64-bit parisc kernels.
Acked-by: Helge Deller <deller@gmx.de> # parisc
Thanks!
Helge
> ---
> arch/parisc/kernel/ptrace.c | 11 ++------
> arch/parisc/kernel/traps.c | 63 ++++++++++++++----------------------------
> arch/parisc/kernel/unaligned.c | 16 +++--------
> arch/parisc/math-emu/driver.c | 9 ++----
> arch/parisc/mm/fault.c | 25 +++++++----------
> 5 files changed, 39 insertions(+), 85 deletions(-)
>
> diff --git a/arch/parisc/kernel/ptrace.c b/arch/parisc/kernel/ptrace.c
> index b1c12ceb1c88..7aa1d4d0d444 100644
> --- a/arch/parisc/kernel/ptrace.c
> +++ b/arch/parisc/kernel/ptrace.c
> @@ -76,8 +76,6 @@ void user_enable_single_step(struct task_struct *task)
> set_tsk_thread_flag(task, TIF_SINGLESTEP);
>
> if (pa_psw(task)->n) {
> - struct siginfo si;
> -
> /* Nullified, just crank over the queue. */
> task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1];
> task_regs(task)->iasq[0] = task_regs(task)->iasq[1];
> @@ -90,12 +88,9 @@ void user_enable_single_step(struct task_struct *task)
> ptrace_disable(task);
> /* Don't wake up the task, but let the
> parent know something happened. */
> - clear_siginfo(&si);
> - si.si_code = TRAP_TRACE;
> - si.si_addr = (void __user *) (task_regs(task)->iaoq[0] & ~3);
> - si.si_signo = SIGTRAP;
> - si.si_errno = 0;
> - force_sig_info(SIGTRAP, &si, task);
> + force_sig_fault(SIGTRAP, TRAP_TRACE,
> + (void __user *) (task_regs(task)->iaoq[0] & ~3),
> + task);
> /* notify_parent(task, SIGCHLD); */
> return;
> }
> diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
> index 98f9f2f85940..132b09c657ff 100644
> --- a/arch/parisc/kernel/traps.c
> +++ b/arch/parisc/kernel/traps.c
> @@ -297,14 +297,8 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
> #define GDB_BREAK_INSN 0x10004
> static void handle_gdb_break(struct pt_regs *regs, int wot)
> {
> - struct siginfo si;
> -
> - clear_siginfo(&si);
> - si.si_signo = SIGTRAP;
> - si.si_errno = 0;
> - si.si_code = wot;
> - si.si_addr = (void __user *) (regs->iaoq[0] & ~3);
> - force_sig_info(SIGTRAP, &si, current);
> + force_sig_fault(SIGTRAP, wot,
> + (void __user *) (regs->iaoq[0] & ~3), current);
> }
>
> static void handle_break(struct pt_regs *regs)
> @@ -488,9 +482,8 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
> {
> unsigned long fault_address = 0;
> unsigned long fault_space = 0;
> - struct siginfo si;
> + int si_code;
>
> - clear_siginfo(&si);
> if (code == 1)
> pdc_console_restart(); /* switch back to pdc if HPMC */
> else
> @@ -573,7 +566,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
> case 8:
> /* Illegal instruction trap */
> die_if_kernel("Illegal instruction", regs, code);
> - si.si_code = ILL_ILLOPC;
> + si_code = ILL_ILLOPC;
> goto give_sigill;
>
> case 9:
> @@ -584,7 +577,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
> case 10:
> /* Privileged operation trap */
> die_if_kernel("Privileged operation", regs, code);
> - si.si_code = ILL_PRVOPC;
> + si_code = ILL_PRVOPC;
> goto give_sigill;
>
> case 11:
> @@ -607,20 +600,16 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
> }
>
> die_if_kernel("Privileged register usage", regs, code);
> - si.si_code = ILL_PRVREG;
> + si_code = ILL_PRVREG;
> give_sigill:
> - si.si_signo = SIGILL;
> - si.si_errno = 0;
> - si.si_addr = (void __user *) regs->iaoq[0];
> - force_sig_info(SIGILL, &si, current);
> + force_sig_fault(SIGILL, si_code,
> + (void __user *) regs->iaoq[0], current);
> return;
>
> case 12:
> /* Overflow Trap, let the userland signal handler do the cleanup */
> - si.si_signo = SIGFPE;
> - si.si_code = FPE_INTOVF;
> - si.si_addr = (void __user *) regs->iaoq[0];
> - force_sig_info(SIGFPE, &si, current);
> + force_sig_fault(SIGFPE, FPE_INTOVF,
> + (void __user *) regs->iaoq[0], current);
> return;
>
> case 13:
> @@ -628,13 +617,11 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
> The condition succeeds in an instruction which traps
> on condition */
> if(user_mode(regs)){
> - si.si_signo = SIGFPE;
> /* Let userspace app figure it out from the insn pointed
> * to by si_addr.
> */
> - si.si_code = FPE_CONDTRAP;
> - si.si_addr = (void __user *) regs->iaoq[0];
> - force_sig_info(SIGFPE, &si, current);
> + force_sig_fault(SIGFPE, FPE_CONDTRAP,
> + (void __user *) regs->iaoq[0], current);
> return;
> }
> /* The kernel doesn't want to handle condition codes */
> @@ -743,14 +730,10 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
> return;
>
> die_if_kernel("Protection id trap", regs, code);
> - si.si_code = SEGV_MAPERR;
> - si.si_signo = SIGSEGV;
> - si.si_errno = 0;
> - if (code == 7)
> - si.si_addr = (void __user *) regs->iaoq[0];
> - else
> - si.si_addr = (void __user *) regs->ior;
> - force_sig_info(SIGSEGV, &si, current);
> + force_sig_fault(SIGSEGV, SEGV_MAPERR,
> + (code == 7)?
> + ((void __user *) regs->iaoq[0]) :
> + ((void __user *) regs->ior), current);
> return;
>
> case 28:
> @@ -764,11 +747,8 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
> "handle_interruption() pid=%d command='%s'\n",
> task_pid_nr(current), current->comm);
> /* SIGBUS, for lack of a better one. */
> - si.si_signo = SIGBUS;
> - si.si_code = BUS_OBJERR;
> - si.si_errno = 0;
> - si.si_addr = (void __user *) regs->ior;
> - force_sig_info(SIGBUS, &si, current);
> + force_sig_fault(SIGBUS, BUS_OBJERR,
> + (void __user *)regs->ior, current);
> return;
> }
> pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
> @@ -783,11 +763,8 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
> "User fault %d on space 0x%08lx, pid=%d command='%s'\n",
> code, fault_space,
> task_pid_nr(current), current->comm);
> - si.si_signo = SIGSEGV;
> - si.si_errno = 0;
> - si.si_code = SEGV_MAPERR;
> - si.si_addr = (void __user *) regs->ior;
> - force_sig_info(SIGSEGV, &si, current);
> + force_sig_fault(SIGSEGV, SEGV_MAPERR,
> + (void __user *)regs->ior, current);
> return;
> }
> }
> diff --git a/arch/parisc/kernel/unaligned.c b/arch/parisc/kernel/unaligned.c
> index 30b7c7f6c471..932bfc0b7cd8 100644
> --- a/arch/parisc/kernel/unaligned.c
> +++ b/arch/parisc/kernel/unaligned.c
> @@ -452,10 +452,8 @@ void handle_unaligned(struct pt_regs *regs)
> unsigned long newbase = R1(regs->iir)?regs->gr[R1(regs->iir)]:0;
> int modify = 0;
> int ret = ERR_NOTHANDLED;
> - struct siginfo si;
> register int flop=0; /* true if this is a flop */
>
> - clear_siginfo(&si);
> __inc_irq_stat(irq_unaligned_count);
>
> /* log a message with pacing */
> @@ -691,21 +689,15 @@ void handle_unaligned(struct pt_regs *regs)
>
> if (ret == ERR_PAGEFAULT)
> {
> - si.si_signo = SIGSEGV;
> - si.si_errno = 0;
> - si.si_code = SEGV_MAPERR;
> - si.si_addr = (void __user *)regs->ior;
> - force_sig_info(SIGSEGV, &si, current);
> + force_sig_fault(SIGSEGV, SEGV_MAPERR,
> + (void __user *)regs->ior, current);
> }
> else
> {
> force_sigbus:
> /* couldn't handle it ... */
> - si.si_signo = SIGBUS;
> - si.si_errno = 0;
> - si.si_code = BUS_ADRALN;
> - si.si_addr = (void __user *)regs->ior;
> - force_sig_info(SIGBUS, &si, current);
> + force_sig_fault(SIGBUS, BUS_ADRALN,
> + (void __user *)regs->ior, current);
> }
>
> return;
> diff --git a/arch/parisc/math-emu/driver.c b/arch/parisc/math-emu/driver.c
> index 0d10efb53361..0590e05571d1 100644
> --- a/arch/parisc/math-emu/driver.c
> +++ b/arch/parisc/math-emu/driver.c
> @@ -81,7 +81,6 @@ int
> handle_fpe(struct pt_regs *regs)
> {
> extern void printbinary(unsigned long x, int nbits);
> - struct siginfo si;
> unsigned int orig_sw, sw;
> int signalcode;
> /* need an intermediate copy of float regs because FPU emulation
> @@ -93,7 +92,6 @@ handle_fpe(struct pt_regs *regs)
> */
> __u64 frcopy[36];
>
> - clear_siginfo(&si);
> memcpy(frcopy, regs->fr, sizeof regs->fr);
> frcopy[32] = 0;
>
> @@ -118,11 +116,8 @@ handle_fpe(struct pt_regs *regs)
>
> memcpy(regs->fr, frcopy, sizeof regs->fr);
> if (signalcode != 0) {
> - si.si_signo = signalcode >> 24;
> - si.si_errno = 0;
> - si.si_code = signalcode & 0xffffff;
> - si.si_addr = (void __user *) regs->iaoq[0];
> - force_sig_info(si.si_signo, &si, current);
> + force_sig_fault(signalcode >> 24, signalcode & 0xffffff,
> + (void __user *) regs->iaoq[0], current);
> return -1;
> }
>
> diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c
> index 51215b0048ef..a80117980fc2 100644
> --- a/arch/parisc/mm/fault.c
> +++ b/arch/parisc/mm/fault.c
> @@ -353,23 +353,22 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
> up_read(&mm->mmap_sem);
>
> if (user_mode(regs)) {
> - struct siginfo si;
> + int signo, si_code;
>
> - clear_siginfo(&si);
> switch (code) {
> case 15: /* Data TLB miss fault/Data page fault */
> /* send SIGSEGV when outside of vma */
> if (!vma ||
> address < vma->vm_start || address >= vma->vm_end) {
> - si.si_signo = SIGSEGV;
> - si.si_code = SEGV_MAPERR;
> + signo = SIGSEGV;
> + si_code = SEGV_MAPERR;
> break;
> }
>
> /* send SIGSEGV for wrong permissions */
> if ((vma->vm_flags & acc_type) != acc_type) {
> - si.si_signo = SIGSEGV;
> - si.si_code = SEGV_ACCERR;
> + signo = SIGSEGV;
> + si_code = SEGV_ACCERR;
> break;
> }
>
> @@ -377,17 +376,16 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
> /* fall through */
> case 17: /* NA data TLB miss / page fault */
> case 18: /* Unaligned access - PCXS only */
> - si.si_signo = SIGBUS;
> - si.si_code = (code == 18) ? BUS_ADRALN : BUS_ADRERR;
> + signo = SIGBUS;
> + si_code = (code == 18) ? BUS_ADRALN : BUS_ADRERR;
> break;
> case 16: /* Non-access instruction TLB miss fault */
> case 26: /* PCXL: Data memory access rights trap */
> default:
> - si.si_signo = SIGSEGV;
> - si.si_code = (code == 26) ? SEGV_ACCERR : SEGV_MAPERR;
> + signo = SIGSEGV;
> + si_code = (code == 26) ? SEGV_ACCERR : SEGV_MAPERR;
> break;
> }
> -
> #ifdef CONFIG_MEMORY_FAILURE
> if (fault & (VM_FAULT_HWPOISON|VM_FAULT_HWPOISON_LARGE)) {
> unsigned int lsb = 0;
> @@ -409,12 +407,9 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
> return;
> }
> #endif
> -
> show_signal_msg(regs, code, address, tsk, vma);
>
> - si.si_errno = 0;
> - si.si_addr = (void __user *) address;
> - force_sig_info(si.si_signo, &si, current);
> + force_sig_fault(signo, si_code, (void __user *) address, current);
> return;
> }
>
>
^ permalink raw reply [flat|nested] 77+ messages in thread
* [REVIEW][PATCH 14/22] signal/riscv: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (12 preceding siblings ...)
2018-04-20 14:38 ` [REVIEW][PATCH 13/22] signal/parisc: Use force_sig_fault " Eric W. Biederman
@ 2018-04-20 14:38 ` Eric W. Biederman
2018-04-21 7:25 ` Christoph Hellwig
2018-04-23 19:11 ` [REVIEW][PATCH 14/22] signal/riscv: Use force_sig_fault where appropriate Palmer Dabbelt
2018-04-20 14:38 ` [REVIEW][PATCH 15/22] signal/s390: " Eric W. Biederman
` (7 subsequent siblings)
21 siblings, 2 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:38 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Palmer Dabbelt, Albert Ou, linux-riscv
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Albert Ou <albert@sifive.com>
Cc: linux-riscv@lists.infradead.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/riscv/kernel/traps.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 48aa6471cede..3087940008f4 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -66,14 +66,7 @@ void die(struct pt_regs *regs, const char *str)
static inline void do_trap_siginfo(int signo, int code,
unsigned long addr, struct task_struct *tsk)
{
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = signo;
- info.si_errno = 0;
- info.si_code = code;
- info.si_addr = (void __user *)addr;
- force_sig_info(signo, &info, tsk);
+ force_sig_fault(signo, code, (void __user *)addr, tsk);
}
void do_trap(struct pt_regs *regs, int signo, int code,
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 14/22] signal/riscv: Use force_sig_fault where appropriate
2018-04-20 14:38 ` [REVIEW][PATCH 14/22] signal/riscv: " Eric W. Biederman
@ 2018-04-21 7:25 ` Christoph Hellwig
2018-04-24 15:31 ` [REVIEW][PATCH 23/22] signal/riscv: Replace do_trap_siginfo with force_sig_fault Eric W. Biederman
2018-04-23 19:11 ` [REVIEW][PATCH 14/22] signal/riscv: Use force_sig_fault where appropriate Palmer Dabbelt
1 sibling, 1 reply; 77+ messages in thread
From: Christoph Hellwig @ 2018-04-21 7:25 UTC (permalink / raw)
To: Eric W. Biederman
Cc: linux-arch, linux-riscv, Palmer Dabbelt, linux-kernel, Albert Ou
On Fri, Apr 20, 2018 at 09:38:03AM -0500, Eric W. Biederman wrote:
> Filling in struct siginfo before calling force_sig_info a tedious and
> error prone process, where once in a great while the wrong fields
> are filled out, and siginfo has been inconsistently cleared.
>
> Simplify this process by using the helper force_sig_fault. Which
> takes as a parameters all of the information it needs, ensures
> all of the fiddly bits of filling in struct siginfo are done properly
> and then calls force_sig_info.
>
> In short about a 5 line reduction in code for every time force_sig_info
> is called, which makes the calling function clearer.
>
> Cc: Palmer Dabbelt <palmer@sifive.com>
> Cc: Albert Ou <albert@sifive.com>
> Cc: linux-riscv@lists.infradead.org
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
> ---
> arch/riscv/kernel/traps.c | 9 +--------
> 1 file changed, 1 insertion(+), 8 deletions(-)
>
> diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
> index 48aa6471cede..3087940008f4 100644
> --- a/arch/riscv/kernel/traps.c
> +++ b/arch/riscv/kernel/traps.c
> @@ -66,14 +66,7 @@ void die(struct pt_regs *regs, const char *str)
> static inline void do_trap_siginfo(int signo, int code,
> unsigned long addr, struct task_struct *tsk)
> {
> - siginfo_t info;
> -
> - clear_siginfo(&info);
> - info.si_signo = signo;
> - info.si_errno = 0;
> - info.si_code = code;
> - info.si_addr = (void __user *)addr;
> - force_sig_info(signo, &info, tsk);
> + force_sig_fault(signo, code, (void __user *)addr, tsk);
> }
Please kill the do_trap_siginfo helper and use force_sig_fault
directly in both callers.
^ permalink raw reply [flat|nested] 77+ messages in thread* [REVIEW][PATCH 23/22] signal/riscv: Replace do_trap_siginfo with force_sig_fault
2018-04-21 7:25 ` Christoph Hellwig
@ 2018-04-24 15:31 ` Eric W. Biederman
0 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-24 15:31 UTC (permalink / raw)
To: Christoph Hellwig
Cc: linux-arch, linux-riscv, Palmer Dabbelt, linux-kernel, Albert Ou
The function force_sig_fault is just the generic version of
do_trap_siginfo with a (void __user *) instead of an unsigned long
parameter for the address.
So just use force_sig_fault to simplify the code.
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Albert Ou <albert@sifive.com>
Cc: linux-riscv@lists.infradead.org
Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/riscv/kernel/traps.c | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 3087940008f4..b99d9dd21fd0 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -63,12 +63,6 @@ void die(struct pt_regs *regs, const char *str)
do_exit(SIGSEGV);
}
-static inline void do_trap_siginfo(int signo, int code,
- unsigned long addr, struct task_struct *tsk)
-{
- force_sig_fault(signo, code, (void __user *)addr, tsk);
-}
-
void do_trap(struct pt_regs *regs, int signo, int code,
unsigned long addr, struct task_struct *tsk)
{
@@ -81,7 +75,7 @@ void do_trap(struct pt_regs *regs, int signo, int code,
show_regs(regs);
}
- do_trap_siginfo(signo, code, addr, tsk);
+ force_sig_fault(signo, code, (void __user *)addr, tsk);
}
static void do_trap_error(struct pt_regs *regs, int signo, int code,
@@ -143,7 +137,7 @@ asmlinkage void do_trap_break(struct pt_regs *regs)
}
#endif /* CONFIG_GENERIC_BUG */
- do_trap_siginfo(SIGTRAP, TRAP_BRKPT, regs->sepc, current);
+ force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)(regs->sepc), current);
regs->sepc += 0x4;
}
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread
* Re: [REVIEW][PATCH 14/22] signal/riscv: Use force_sig_fault where appropriate
2018-04-20 14:38 ` [REVIEW][PATCH 14/22] signal/riscv: " Eric W. Biederman
2018-04-21 7:25 ` Christoph Hellwig
@ 2018-04-23 19:11 ` Palmer Dabbelt
2018-04-24 15:28 ` Eric W. Biederman
1 sibling, 1 reply; 77+ messages in thread
From: Palmer Dabbelt @ 2018-04-23 19:11 UTC (permalink / raw)
To: ebiederm; +Cc: linux-arch, linux-kernel, ebiederm, albert, linux-riscv
On Fri, 20 Apr 2018 07:38:03 PDT (-0700), ebiederm@xmission.com wrote:
> Filling in struct siginfo before calling force_sig_info a tedious and
> error prone process, where once in a great while the wrong fields
> are filled out, and siginfo has been inconsistently cleared.
>
> Simplify this process by using the helper force_sig_fault. Which
> takes as a parameters all of the information it needs, ensures
> all of the fiddly bits of filling in struct siginfo are done properly
> and then calls force_sig_info.
>
> In short about a 5 line reduction in code for every time force_sig_info
> is called, which makes the calling function clearer.
>
> Cc: Palmer Dabbelt <palmer@sifive.com>
> Cc: Albert Ou <albert@sifive.com>
> Cc: linux-riscv@lists.infradead.org
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
> ---
> arch/riscv/kernel/traps.c | 9 +--------
> 1 file changed, 1 insertion(+), 8 deletions(-)
>
> diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
> index 48aa6471cede..3087940008f4 100644
> --- a/arch/riscv/kernel/traps.c
> +++ b/arch/riscv/kernel/traps.c
> @@ -66,14 +66,7 @@ void die(struct pt_regs *regs, const char *str)
> static inline void do_trap_siginfo(int signo, int code,
> unsigned long addr, struct task_struct *tsk)
> {
> - siginfo_t info;
> -
> - clear_siginfo(&info);
> - info.si_signo = signo;
> - info.si_errno = 0;
> - info.si_code = code;
> - info.si_addr = (void __user *)addr;
> - force_sig_info(signo, &info, tsk);
> + force_sig_fault(signo, code, (void __user *)addr, tsk);
> }
>
> void do_trap(struct pt_regs *regs, int signo, int code,
If I understand this correctly, any change in behavior this causes would have
been a bug on our end not filling out siginfo correctly? In that case then
feel free to add an
Acked-by: Palmer Dabbelt <palmer@sifive.com>
Thanks!
^ permalink raw reply [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 14/22] signal/riscv: Use force_sig_fault where appropriate
2018-04-23 19:11 ` [REVIEW][PATCH 14/22] signal/riscv: Use force_sig_fault where appropriate Palmer Dabbelt
@ 2018-04-24 15:28 ` Eric W. Biederman
0 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-24 15:28 UTC (permalink / raw)
To: Palmer Dabbelt; +Cc: linux-arch, linux-kernel, albert, linux-riscv
Palmer Dabbelt <palmer@sifive.com> writes:
> On Fri, 20 Apr 2018 07:38:03 PDT (-0700), ebiederm@xmission.com wrote:
>> Filling in struct siginfo before calling force_sig_info a tedious and
>> error prone process, where once in a great while the wrong fields
>> are filled out, and siginfo has been inconsistently cleared.
>>
>> Simplify this process by using the helper force_sig_fault. Which
>> takes as a parameters all of the information it needs, ensures
>> all of the fiddly bits of filling in struct siginfo are done properly
>> and then calls force_sig_info.
>>
>> In short about a 5 line reduction in code for every time force_sig_info
>> is called, which makes the calling function clearer.
>>
>> Cc: Palmer Dabbelt <palmer@sifive.com>
>> Cc: Albert Ou <albert@sifive.com>
>> Cc: linux-riscv@lists.infradead.org
>> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
>> ---
>> arch/riscv/kernel/traps.c | 9 +--------
>> 1 file changed, 1 insertion(+), 8 deletions(-)
>>
>> diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
>> index 48aa6471cede..3087940008f4 100644
>> --- a/arch/riscv/kernel/traps.c
>> +++ b/arch/riscv/kernel/traps.c
>> @@ -66,14 +66,7 @@ void die(struct pt_regs *regs, const char *str)
>> static inline void do_trap_siginfo(int signo, int code,
>> unsigned long addr, struct task_struct *tsk)
>> {
>> - siginfo_t info;
>> -
>> - clear_siginfo(&info);
>> - info.si_signo = signo;
>> - info.si_errno = 0;
>> - info.si_code = code;
>> - info.si_addr = (void __user *)addr;
>> - force_sig_info(signo, &info, tsk);
>> + force_sig_fault(signo, code, (void __user *)addr, tsk);
>> }
>>
>> void do_trap(struct pt_regs *regs, int signo, int code,
>
> If I understand this correctly, any change in behavior this causes would have
> been a bug on our end not filling out siginfo correctly? In that case then feel
> free to add an
If this change above causes any user visible changes it is a bug.
As Christoph rightly pointed out force_sig_fault is simply the arch
generic version of do_trap_siginfo.
Eric
^ permalink raw reply [flat|nested] 77+ messages in thread
* [REVIEW][PATCH 15/22] signal/s390: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (13 preceding siblings ...)
2018-04-20 14:38 ` [REVIEW][PATCH 14/22] signal/riscv: " Eric W. Biederman
@ 2018-04-20 14:38 ` Eric W. Biederman
2018-04-23 5:44 ` Martin Schwidefsky
2018-04-20 14:38 ` [REVIEW][PATCH 16/22] signal/sh: " Eric W. Biederman
` (6 subsequent siblings)
21 siblings, 1 reply; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:38 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Martin Schwidefsky,
Heiko Carstens, linux-s390
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux-s390@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/s390/kernel/traps.c | 32 ++++++--------------------------
arch/s390/mm/fault.c | 23 ++++++-----------------
2 files changed, 12 insertions(+), 43 deletions(-)
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 3ba649d8aa5a..8003b38c1688 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -44,15 +44,8 @@ int is_valid_bugaddr(unsigned long addr)
void do_report_trap(struct pt_regs *regs, int si_signo, int si_code, char *str)
{
- siginfo_t info;
-
if (user_mode(regs)) {
- clear_siginfo(&info);
- info.si_signo = si_signo;
- info.si_errno = 0;
- info.si_code = si_code;
- info.si_addr = get_trap_ip(regs);
- force_sig_info(si_signo, &info, current);
+ force_sig_fault(si_signo, si_code, get_trap_ip(regs), current);
report_user_fault(regs, si_signo, 0);
} else {
const struct exception_table_entry *fixup;
@@ -81,19 +74,12 @@ NOKPROBE_SYMBOL(do_trap);
void do_per_trap(struct pt_regs *regs)
{
- siginfo_t info;
-
if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, SIGTRAP) == NOTIFY_STOP)
return;
if (!current->ptrace)
return;
- clear_siginfo(&info);
- info.si_signo = SIGTRAP;
- info.si_errno = 0;
- info.si_code = TRAP_HWBKPT;
- info.si_addr =
- (void __force __user *) current->thread.per_event.address;
- force_sig_info(SIGTRAP, &info, current);
+ force_sig_fault(SIGTRAP, TRAP_HWBKPT,
+ (void __force __user *) current->thread.per_event.address, current);
}
NOKPROBE_SYMBOL(do_per_trap);
@@ -178,15 +164,9 @@ void illegal_op(struct pt_regs *regs)
if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
return;
if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
- if (current->ptrace) {
- siginfo_t info;
- clear_siginfo(&info);
- info.si_signo = SIGTRAP;
- info.si_errno = 0;
- info.si_code = TRAP_BRKPT;
- info.si_addr = location;
- force_sig_info(SIGTRAP, &info, current);
- } else
+ if (current->ptrace)
+ force_sig_fault(SIGTRAP, TRAP_BRKPT, location, current);
+ else
signal = SIGILL;
#ifdef CONFIG_UPROBES
} else if (*((__u16 *) opcode) == UPROBE_SWBP_INSN) {
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index b3ff0e8e5860..e074480d3598 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -265,15 +265,10 @@ void report_user_fault(struct pt_regs *regs, long signr, int is_mm_fault)
*/
static noinline void do_sigsegv(struct pt_regs *regs, int si_code)
{
- struct siginfo si;
-
report_user_fault(regs, SIGSEGV, 1);
- clear_siginfo(&si);
- si.si_signo = SIGSEGV;
- si.si_errno = 0;
- si.si_code = si_code;
- si.si_addr = (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK);
- force_sig_info(SIGSEGV, &si, current);
+ force_sig_fault(SIGSEGV, si_code,
+ (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK),
+ current);
}
static noinline void do_no_context(struct pt_regs *regs)
@@ -317,19 +312,13 @@ static noinline void do_low_address(struct pt_regs *regs)
static noinline void do_sigbus(struct pt_regs *regs)
{
- struct task_struct *tsk = current;
- struct siginfo si;
-
/*
* Send a sigbus, regardless of whether we were in kernel
* or user mode.
*/
- clear_siginfo(&si);
- si.si_signo = SIGBUS;
- si.si_errno = 0;
- si.si_code = BUS_ADRERR;
- si.si_addr = (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK);
- force_sig_info(SIGBUS, &si, tsk);
+ force_sig_fault(SIGBUS, BUS_ADRERR,
+ (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK),
+ current);
}
static noinline int signal_return(struct pt_regs *regs)
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 15/22] signal/s390: Use force_sig_fault where appropriate
2018-04-20 14:38 ` [REVIEW][PATCH 15/22] signal/s390: " Eric W. Biederman
@ 2018-04-23 5:44 ` Martin Schwidefsky
0 siblings, 0 replies; 77+ messages in thread
From: Martin Schwidefsky @ 2018-04-23 5:44 UTC (permalink / raw)
To: Eric W. Biederman; +Cc: linux-arch, linux-kernel, Heiko Carstens, linux-s390
On Fri, 20 Apr 2018 09:38:04 -0500
"Eric W. Biederman" <ebiederm@xmission.com> wrote:
> Filling in struct siginfo before calling force_sig_info a tedious and
> error prone process, where once in a great while the wrong fields
> are filled out, and siginfo has been inconsistently cleared.
>
> Simplify this process by using the helper force_sig_fault. Which
> takes as a parameters all of the information it needs, ensures
> all of the fiddly bits of filling in struct siginfo are done properly
> and then calls force_sig_info.
>
> In short about a 5 line reduction in code for every time force_sig_info
> is called, which makes the calling function clearer.
>
> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
> Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
> Cc: linux-s390@vger.kernel.org
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
> ---
> arch/s390/kernel/traps.c | 32 ++++++--------------------------
> arch/s390/mm/fault.c | 23 ++++++-----------------
> 2 files changed, 12 insertions(+), 43 deletions(-)
Compiles & boots. Comparing old vs. new the same values are
set in siginfo. Looks good.
Acked-by: Martin Schwidefsky >schwidefsky@de.ibm.com>
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
^ permalink raw reply [flat|nested] 77+ messages in thread
* [REVIEW][PATCH 16/22] signal/sh: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (14 preceding siblings ...)
2018-04-20 14:38 ` [REVIEW][PATCH 15/22] signal/s390: " Eric W. Biederman
@ 2018-04-20 14:38 ` Eric W. Biederman
2018-04-20 14:55 ` Rich Felker
2018-04-20 14:38 ` [REVIEW][PATCH 17/22] signal/sparc: Use send_sig_fault where appropriate Eric W. Biederman
` (5 subsequent siblings)
21 siblings, 1 reply; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:38 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Yoshinori Sato, Rich Felker, linux-sh
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: linux-sh@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/sh/kernel/traps_32.c | 19 +++++--------------
arch/sh/math-emu/math.c | 9 ++-------
arch/sh/mm/fault.c | 10 +---------
3 files changed, 8 insertions(+), 30 deletions(-)
diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c
index e85e59c3d6df..660a4bc17698 100644
--- a/arch/sh/kernel/traps_32.c
+++ b/arch/sh/kernel/traps_32.c
@@ -477,7 +477,6 @@ asmlinkage void do_address_error(struct pt_regs *regs,
{
unsigned long error_code = 0;
mm_segment_t oldfs;
- siginfo_t info;
insn_size_t instruction;
int tmp;
@@ -537,12 +536,7 @@ asmlinkage void do_address_error(struct pt_regs *regs,
"access (PC %lx PR %lx)\n", current->comm, regs->pc,
regs->pr);
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = si_code;
- info.si_addr = (void __user *)address;
- force_sig_info(SIGBUS, &info, current);
+ force_sig_fault(SIGBUS, si_code, (void __user *)address, current);
} else {
inc_unaligned_kernel_access();
@@ -599,20 +593,17 @@ int is_dsp_inst(struct pt_regs *regs)
#ifdef CONFIG_CPU_SH2A
asmlinkage void do_divide_error(unsigned long r4)
{
- siginfo_t info;
+ int code;
- clear_siginfo(&info);
switch (r4) {
case TRAP_DIVZERO_ERROR:
- info.si_code = FPE_INTDIV;
+ code = FPE_INTDIV;
break;
case TRAP_DIVOVF_ERROR:
- info.si_code = FPE_INTOVF;
+ code = FPE_INTOVF;
break;
}
-
- info.si_signo = SIGFPE;
- force_sig_info(info.si_signo, &info, current);
+ force_sig_fault(SIGFPE, code, NULL, current);
}
#endif
diff --git a/arch/sh/math-emu/math.c b/arch/sh/math-emu/math.c
index d6d2213df078..a0fa8fc88739 100644
--- a/arch/sh/math-emu/math.c
+++ b/arch/sh/math-emu/math.c
@@ -507,7 +507,6 @@ static int ieee_fpe_handler(struct pt_regs *regs)
unsigned short insn = *(unsigned short *)regs->pc;
unsigned short finsn;
unsigned long nextpc;
- siginfo_t info;
int nib[4] = {
(insn >> 12) & 0xf,
(insn >> 8) & 0xf,
@@ -560,12 +559,8 @@ static int ieee_fpe_handler(struct pt_regs *regs)
~(FPSCR_CAUSE_MASK | FPSCR_FLAG_MASK);
task_thread_info(tsk)->status |= TS_USEDFPU;
} else {
- clear_siginfo(&info);
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_code = FPE_FLTINV;
- info.si_addr = (void __user *)regs->pc;
- force_sig_info(SIGFPE, &info, tsk);
+ force_sig_fault(SIGFPE, FPE_FLTINV,
+ (void __user *)regs->pc, tsk);
}
regs->pc = nextpc;
diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c
index 4c98b6f20e02..b8e7bb84b6b1 100644
--- a/arch/sh/mm/fault.c
+++ b/arch/sh/mm/fault.c
@@ -42,15 +42,7 @@ static void
force_sig_info_fault(int si_signo, int si_code, unsigned long address,
struct task_struct *tsk)
{
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = si_signo;
- info.si_errno = 0;
- info.si_code = si_code;
- info.si_addr = (void __user *)address;
-
- force_sig_info(si_signo, &info, tsk);
+ force_sig_fault(si_signo, si_code, (void __user *)address, tsk);
}
/*
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 16/22] signal/sh: Use force_sig_fault where appropriate
2018-04-20 14:38 ` [REVIEW][PATCH 16/22] signal/sh: " Eric W. Biederman
@ 2018-04-20 14:55 ` Rich Felker
2018-05-28 9:19 ` Geert Uytterhoeven
0 siblings, 1 reply; 77+ messages in thread
From: Rich Felker @ 2018-04-20 14:55 UTC (permalink / raw)
To: Eric W. Biederman; +Cc: linux-arch, linux-kernel, Yoshinori Sato, linux-sh
On Fri, Apr 20, 2018 at 09:38:05AM -0500, Eric W. Biederman wrote:
> Filling in struct siginfo before calling force_sig_info a tedious and
> error prone process, where once in a great while the wrong fields
> are filled out, and siginfo has been inconsistently cleared.
>
> Simplify this process by using the helper force_sig_fault. Which
> takes as a parameters all of the information it needs, ensures
> all of the fiddly bits of filling in struct siginfo are done properly
> and then calls force_sig_info.
>
> In short about a 5 line reduction in code for every time force_sig_info
> is called, which makes the calling function clearer.
>
> Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
> Cc: Rich Felker <dalias@libc.org>
> Cc: linux-sh@vger.kernel.org
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
> ---
> arch/sh/kernel/traps_32.c | 19 +++++--------------
> arch/sh/math-emu/math.c | 9 ++-------
> arch/sh/mm/fault.c | 10 +---------
> 3 files changed, 8 insertions(+), 30 deletions(-)
>
> diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c
> index e85e59c3d6df..660a4bc17698 100644
> --- a/arch/sh/kernel/traps_32.c
> +++ b/arch/sh/kernel/traps_32.c
> @@ -477,7 +477,6 @@ asmlinkage void do_address_error(struct pt_regs *regs,
> {
> unsigned long error_code = 0;
> mm_segment_t oldfs;
> - siginfo_t info;
> insn_size_t instruction;
> int tmp;
>
> @@ -537,12 +536,7 @@ asmlinkage void do_address_error(struct pt_regs *regs,
> "access (PC %lx PR %lx)\n", current->comm, regs->pc,
> regs->pr);
>
> - clear_siginfo(&info);
> - info.si_signo = SIGBUS;
> - info.si_errno = 0;
> - info.si_code = si_code;
> - info.si_addr = (void __user *)address;
> - force_sig_info(SIGBUS, &info, current);
> + force_sig_fault(SIGBUS, si_code, (void __user *)address, current);
> } else {
> inc_unaligned_kernel_access();
>
> @@ -599,20 +593,17 @@ int is_dsp_inst(struct pt_regs *regs)
> #ifdef CONFIG_CPU_SH2A
> asmlinkage void do_divide_error(unsigned long r4)
> {
> - siginfo_t info;
> + int code;
>
> - clear_siginfo(&info);
> switch (r4) {
> case TRAP_DIVZERO_ERROR:
> - info.si_code = FPE_INTDIV;
> + code = FPE_INTDIV;
> break;
> case TRAP_DIVOVF_ERROR:
> - info.si_code = FPE_INTOVF;
> + code = FPE_INTOVF;
> break;
> }
> -
> - info.si_signo = SIGFPE;
> - force_sig_info(info.si_signo, &info, current);
> + force_sig_fault(SIGFPE, code, NULL, current);
> }
> #endif
>
> diff --git a/arch/sh/math-emu/math.c b/arch/sh/math-emu/math.c
> index d6d2213df078..a0fa8fc88739 100644
> --- a/arch/sh/math-emu/math.c
> +++ b/arch/sh/math-emu/math.c
> @@ -507,7 +507,6 @@ static int ieee_fpe_handler(struct pt_regs *regs)
> unsigned short insn = *(unsigned short *)regs->pc;
> unsigned short finsn;
> unsigned long nextpc;
> - siginfo_t info;
> int nib[4] = {
> (insn >> 12) & 0xf,
> (insn >> 8) & 0xf,
> @@ -560,12 +559,8 @@ static int ieee_fpe_handler(struct pt_regs *regs)
> ~(FPSCR_CAUSE_MASK | FPSCR_FLAG_MASK);
> task_thread_info(tsk)->status |= TS_USEDFPU;
> } else {
> - clear_siginfo(&info);
> - info.si_signo = SIGFPE;
> - info.si_errno = 0;
> - info.si_code = FPE_FLTINV;
> - info.si_addr = (void __user *)regs->pc;
> - force_sig_info(SIGFPE, &info, tsk);
> + force_sig_fault(SIGFPE, FPE_FLTINV,
> + (void __user *)regs->pc, tsk);
> }
>
> regs->pc = nextpc;
> diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c
> index 4c98b6f20e02..b8e7bb84b6b1 100644
> --- a/arch/sh/mm/fault.c
> +++ b/arch/sh/mm/fault.c
> @@ -42,15 +42,7 @@ static void
> force_sig_info_fault(int si_signo, int si_code, unsigned long address,
> struct task_struct *tsk)
> {
> - siginfo_t info;
> -
> - clear_siginfo(&info);
> - info.si_signo = si_signo;
> - info.si_errno = 0;
> - info.si_code = si_code;
> - info.si_addr = (void __user *)address;
> -
> - force_sig_info(si_signo, &info, tsk);
> + force_sig_fault(si_signo, si_code, (void __user *)address, tsk);
> }
>
> /*
> --
> 2.14.1
Acked-by: Rich Felker <dalias@libc.org>
^ permalink raw reply [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 16/22] signal/sh: Use force_sig_fault where appropriate
2018-04-20 14:55 ` Rich Felker
@ 2018-05-28 9:19 ` Geert Uytterhoeven
2018-05-29 15:00 ` [PATCH] signal/sh: Stop gcc warning about an impossible case in do_divide_error Eric W. Biederman
0 siblings, 1 reply; 77+ messages in thread
From: Geert Uytterhoeven @ 2018-05-28 9:19 UTC (permalink / raw)
To: Rich Felker
Cc: Eric W. Biederman, Linux-Arch, Linux Kernel Mailing List,
Yoshinori Sato, Linux-sh list
On Fri, Apr 20, 2018 at 4:55 PM, Rich Felker <dalias@libc.org> wrote:
> On Fri, Apr 20, 2018 at 09:38:05AM -0500, Eric W. Biederman wrote:
>> Filling in struct siginfo before calling force_sig_info a tedious and
>> error prone process, where once in a great while the wrong fields
>> are filled out, and siginfo has been inconsistently cleared.
>>
>> Simplify this process by using the helper force_sig_fault. Which
>> takes as a parameters all of the information it needs, ensures
>> all of the fiddly bits of filling in struct siginfo are done properly
>> and then calls force_sig_info.
>>
>> In short about a 5 line reduction in code for every time force_sig_info
>> is called, which makes the calling function clearer.
>>
>> Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
>> Cc: Rich Felker <dalias@libc.org>
>> Cc: linux-sh@vger.kernel.org
>> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
>> --- a/arch/sh/kernel/traps_32.c
>> +++ b/arch/sh/kernel/traps_32.c
>> @@ -599,20 +593,17 @@ int is_dsp_inst(struct pt_regs *regs)
>> #ifdef CONFIG_CPU_SH2A
>> asmlinkage void do_divide_error(unsigned long r4)
>> {
>> - siginfo_t info;
>> + int code;
>>
>> - clear_siginfo(&info);
>> switch (r4) {
>> case TRAP_DIVZERO_ERROR:
>> - info.si_code = FPE_INTDIV;
>> + code = FPE_INTDIV;
>> break;
>> case TRAP_DIVOVF_ERROR:
>> - info.si_code = FPE_INTOVF;
>> + code = FPE_INTOVF;
>> break;
>> }
>> -
>> - info.si_signo = SIGFPE;
>> - force_sig_info(info.si_signo, &info, current);
>> + force_sig_fault(SIGFPE, code, NULL, current);
/kisskb/src/arch/sh/kernel/traps_32.c:606:17: error: 'code' may be
used uninitialized in this function [-Werror=uninitialized]
http://kisskb.ellerman.id.au/kisskb/buildresult/13366052/
http://kisskb.ellerman.id.au/kisskb/buildresult/13366048/
http://kisskb.ellerman.id.au/kisskb/buildresult/13366072/
>> }
> Acked-by: Rich Felker <dalias@libc.org>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 77+ messages in thread* [PATCH] signal/sh: Stop gcc warning about an impossible case in do_divide_error
2018-05-28 9:19 ` Geert Uytterhoeven
@ 2018-05-29 15:00 ` Eric W. Biederman
2018-05-30 7:54 ` Sergei Shtylyov
0 siblings, 1 reply; 77+ messages in thread
From: Eric W. Biederman @ 2018-05-29 15:00 UTC (permalink / raw)
To: Geert Uytterhoeven
Cc: Rich Felker, Linux-Arch, Linux Kernel Mailing List,
Yoshinori Sato, Linux-sh list
Geert Uytterhoeven <geert@linux-m68k.org> reported:
> HOSTLD scripts/mod/modpost
> CC arch/sh/kernel/traps_32.o
> arch/sh/kernel/traps_32.c: In function 'do_divide_error':
> arch/sh/kernel/traps_32.c:606:17: error: 'code' may be used uninitialized in this function [-Werror=uninitialized]
> cc1: all warnings being treated as errors
It is clear from inspection that do_divide_error is only called with
TRAP_DIVZERO_ERROR or TRAP_DIVOVF_ERROR, as that is the way
set_exception_table_vec is called. So let gcc know the other cases
should not be considered by returning in all other cases.
This removes the warning and let's the code continue to build.
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: c65626c0cd4d ("signal/sh: Use force_sig_fault where appropriate")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
I am adding this fix to my tree to at least let the code build.
arch/sh/kernel/traps_32.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c
index 660a4bc17698..60709ad17fc7 100644
--- a/arch/sh/kernel/traps_32.c
+++ b/arch/sh/kernel/traps_32.c
@@ -602,6 +602,9 @@ asmlinkage void do_divide_error(unsigned long r4)
case TRAP_DIVOVF_ERROR:
code = FPE_INTOVF;
break;
+ default:
+ /* Let gcc know unhandled cases don't make it past here */
+ return;
}
force_sig_fault(SIGFPE, code, NULL, current);
}
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* Re: [PATCH] signal/sh: Stop gcc warning about an impossible case in do_divide_error
2018-05-29 15:00 ` [PATCH] signal/sh: Stop gcc warning about an impossible case in do_divide_error Eric W. Biederman
@ 2018-05-30 7:54 ` Sergei Shtylyov
0 siblings, 0 replies; 77+ messages in thread
From: Sergei Shtylyov @ 2018-05-30 7:54 UTC (permalink / raw)
To: Eric W. Biederman, Geert Uytterhoeven
Cc: Rich Felker, Linux-Arch, Linux Kernel Mailing List,
Yoshinori Sato, Linux-sh list
Hello!
On 5/29/2018 6:00 PM, Eric W. Biederman wrote:
> Geert Uytterhoeven <geert@linux-m68k.org> reported:
>> HOSTLD scripts/mod/modpost
>> CC arch/sh/kernel/traps_32.o
>> arch/sh/kernel/traps_32.c: In function 'do_divide_error':
>> arch/sh/kernel/traps_32.c:606:17: error: 'code' may be used uninitialized in this function [-Werror=uninitialized]
>> cc1: all warnings being treated as errors
>
> It is clear from inspection that do_divide_error is only called with
> TRAP_DIVZERO_ERROR or TRAP_DIVOVF_ERROR, as that is the way
> set_exception_table_vec is called. So let gcc know the other cases
> should not be considered by returning in all other cases.
>
> This removes the warning and let's the code continue to build.
Lets. :-)
> Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Fixes: c65626c0cd4d ("signal/sh: Use force_sig_fault where appropriate")
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
[...]
MBR, Sergei
^ permalink raw reply [flat|nested] 77+ messages in thread
* [REVIEW][PATCH 17/22] signal/sparc: Use send_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (15 preceding siblings ...)
2018-04-20 14:38 ` [REVIEW][PATCH 16/22] signal/sh: " Eric W. Biederman
@ 2018-04-20 14:38 ` Eric W. Biederman
2018-04-20 14:38 ` [REVIEW][PATCH 18/22] signal/sparc: Use force_sig_fault " Eric W. Biederman
` (4 subsequent siblings)
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:38 UTC (permalink / raw)
To: linux-arch; +Cc: linux-kernel, Eric W. Biederman, David Miller, sparclinux
Filling in struct siginfo before calling send_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper send_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls send_sig_info.
In short about a 5 line reduction in code for every time send_sig_info
is called, which makes the calling function clearer.
Cc: David Miller <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/sparc/kernel/traps_32.c | 93 ++++++++--------------------------------
arch/sparc/kernel/unaligned_32.c | 12 ++----
2 files changed, 20 insertions(+), 85 deletions(-)
diff --git a/arch/sparc/kernel/traps_32.c b/arch/sparc/kernel/traps_32.c
index 03e522274b8b..06f43cf9695f 100644
--- a/arch/sparc/kernel/traps_32.c
+++ b/arch/sparc/kernel/traps_32.c
@@ -116,8 +116,6 @@ void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
- siginfo_t info;
-
if(psr & PSR_PS)
die_if_kernel("Kernel illegal instruction", regs);
#ifdef TRAP_DEBUG
@@ -125,29 +123,15 @@ void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned lon
regs->pc, *(unsigned long *)regs->pc);
#endif
- clear_siginfo(&info);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLOPC;
- info.si_addr = (void __user *)pc;
- info.si_trapno = 0;
- send_sig_info(SIGILL, &info, current);
+ send_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)pc, 0, current);
}
void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
- siginfo_t info;
-
if(psr & PSR_PS)
die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
- clear_siginfo(&info);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_PRVOPC;
- info.si_addr = (void __user *)pc;
- info.si_trapno = 0;
- send_sig_info(SIGILL, &info, current);
+ send_sig_fault(SIGILL, ILL_PRVOPC, (void __user *)pc, 0, current);
}
/* XXX User may want to be allowed to do this. XXX */
@@ -155,8 +139,6 @@ void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long n
void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
- siginfo_t info;
-
if(regs->psr & PSR_PS) {
printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
regs->u_regs[UREG_RETPC]);
@@ -168,13 +150,9 @@ void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned lon
instruction_dump ((unsigned long *) regs->pc);
printk ("do_MNA!\n");
#endif
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRALN;
- info.si_addr = /* FIXME: Should dig out mna address */ (void *)0;
- info.si_trapno = 0;
- send_sig_info(SIGBUS, &info, current);
+ send_sig_fault(SIGBUS, BUS_ADRALN,
+ /* FIXME: Should dig out mna address */ (void *)0,
+ 0, current);
}
static unsigned long init_fsr = 0x0UL;
@@ -230,9 +208,9 @@ void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
static int calls;
- siginfo_t info;
unsigned long fsr;
int ret = 0;
+ int code;
#ifndef CONFIG_SMP
struct task_struct *fpt = last_task_used_math;
#else
@@ -307,25 +285,20 @@ void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
}
fsr = fpt->thread.fsr;
- clear_siginfo(&info);
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_addr = (void __user *)pc;
- info.si_trapno = 0;
- info.si_code = FPE_FLTUNK;
+ code = FPE_FLTUNK;
if ((fsr & 0x1c000) == (1 << 14)) {
if (fsr & 0x10)
- info.si_code = FPE_FLTINV;
+ code = FPE_FLTINV;
else if (fsr & 0x08)
- info.si_code = FPE_FLTOVF;
+ code = FPE_FLTOVF;
else if (fsr & 0x04)
- info.si_code = FPE_FLTUND;
+ code = FPE_FLTUND;
else if (fsr & 0x02)
- info.si_code = FPE_FLTDIV;
+ code = FPE_FLTDIV;
else if (fsr & 0x01)
- info.si_code = FPE_FLTRES;
+ code = FPE_FLTRES;
}
- send_sig_info(SIGFPE, &info, fpt);
+ send_sig_fault(SIGFPE, code, (void __user *)pc, 0, fpt);
#ifndef CONFIG_SMP
last_task_used_math = NULL;
#endif
@@ -337,17 +310,9 @@ void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
- siginfo_t info;
-
if(psr & PSR_PS)
die_if_kernel("Penguin overflow trap from kernel mode", regs);
- clear_siginfo(&info);
- info.si_signo = SIGEMT;
- info.si_errno = 0;
- info.si_code = EMT_TAGOVF;
- info.si_addr = (void __user *)pc;
- info.si_trapno = 0;
- send_sig_info(SIGEMT, &info, current);
+ send_sig_fault(SIGEMT, EMT_TAGOVF, (void __user *)pc, 0, current);
}
void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
@@ -383,47 +348,23 @@ void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc
void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_COPROC;
- info.si_addr = (void __user *)pc;
- info.si_trapno = 0;
- send_sig_info(SIGILL, &info, current);
+ send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current);
}
void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
- siginfo_t info;
-
#ifdef TRAP_DEBUG
printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
pc, npc, psr);
#endif
- clear_siginfo(&info);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_COPROC;
- info.si_addr = (void __user *)pc;
- info.si_trapno = 0;
- send_sig_info(SIGILL, &info, current);
+ send_sig_fault(SIGILL, ILL_COPROC, (void __user *)pc, 0, current);
}
void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_code = FPE_INTDIV;
- info.si_addr = (void __user *)pc;
- info.si_trapno = 0;
- send_sig_info(SIGFPE, &info, current);
+ send_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)pc, 0, current);
}
#ifdef CONFIG_DEBUG_BUGVERBOSE
diff --git a/arch/sparc/kernel/unaligned_32.c b/arch/sparc/kernel/unaligned_32.c
index 0e4cf7217413..64ac8c0c1429 100644
--- a/arch/sparc/kernel/unaligned_32.c
+++ b/arch/sparc/kernel/unaligned_32.c
@@ -311,15 +311,9 @@ static inline int ok_for_user(struct pt_regs *regs, unsigned int insn,
static void user_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
{
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRALN;
- info.si_addr = (void __user *)safe_compute_effective_address(regs, insn);
- info.si_trapno = 0;
- send_sig_info(SIGBUS, &info, current);
+ send_sig_fault(SIGBUS, BUS_ADRALN,
+ (void __user *)safe_compute_effective_address(regs, insn),
+ 0, current);
}
asmlinkage void user_unaligned_trap(struct pt_regs *regs, unsigned int insn)
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 18/22] signal/sparc: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (16 preceding siblings ...)
2018-04-20 14:38 ` [REVIEW][PATCH 17/22] signal/sparc: Use send_sig_fault where appropriate Eric W. Biederman
@ 2018-04-20 14:38 ` Eric W. Biederman
2018-04-20 14:38 ` [REVIEW][PATCH 19/22] signal/um: Use force_sig_fault in relay_signal Eric W. Biederman
` (3 subsequent siblings)
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:38 UTC (permalink / raw)
To: linux-arch; +Cc: linux-kernel, Eric W. Biederman, David Miller, sparclinux
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: David Miller <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/sparc/kernel/process_64.c | 10 +--
arch/sparc/kernel/sys_sparc_32.c | 9 +--
arch/sparc/kernel/sys_sparc_64.c | 8 +--
arch/sparc/kernel/traps_32.c | 21 +-----
arch/sparc/kernel/traps_64.c | 145 ++++++++-------------------------------
arch/sparc/mm/fault_32.c | 13 +---
arch/sparc/mm/fault_64.c | 9 +--
7 files changed, 37 insertions(+), 178 deletions(-)
diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index 2219e55206b4..6c086086ca8f 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -518,15 +518,7 @@ void synchronize_user_stack(void)
static void stack_unaligned(unsigned long sp)
{
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRALN;
- info.si_addr = (void __user *) sp;
- info.si_trapno = 0;
- force_sig_info(SIGBUS, &info, current);
+ force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *) sp, 0, current);
}
void fault_in_user_windows(void)
diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c
index 00f6353fe435..7f3d9c59719a 100644
--- a/arch/sparc/kernel/sys_sparc_32.c
+++ b/arch/sparc/kernel/sys_sparc_32.c
@@ -147,18 +147,11 @@ SYSCALL_DEFINE0(nis_syscall)
asmlinkage void
sparc_breakpoint (struct pt_regs *regs)
{
- siginfo_t info;
#ifdef DEBUG_SPARC_BREAKPOINT
printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
#endif
- clear_siginfo(&info);
- info.si_signo = SIGTRAP;
- info.si_errno = 0;
- info.si_code = TRAP_BRKPT;
- info.si_addr = (void __user *)regs->pc;
- info.si_trapno = 0;
- force_sig_info(SIGTRAP, &info, current);
+ force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc, 0, current);
#ifdef DEBUG_SPARC_BREAKPOINT
printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index 9ef8de63f28b..7e49bbc925a5 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -502,7 +502,6 @@ SYSCALL_DEFINE0(nis_syscall)
asmlinkage void sparc_breakpoint(struct pt_regs *regs)
{
enum ctx_state prev_state = exception_enter();
- siginfo_t info;
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
@@ -511,12 +510,7 @@ asmlinkage void sparc_breakpoint(struct pt_regs *regs)
#ifdef DEBUG_SPARC_BREAKPOINT
printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
#endif
- info.si_signo = SIGTRAP;
- info.si_errno = 0;
- info.si_code = TRAP_BRKPT;
- info.si_addr = (void __user *)regs->tpc;
- info.si_trapno = 0;
- force_sig_info(SIGTRAP, &info, current);
+ force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->tpc, 0, current);
#ifdef DEBUG_SPARC_BREAKPOINT
printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
#endif
diff --git a/arch/sparc/kernel/traps_32.c b/arch/sparc/kernel/traps_32.c
index 06f43cf9695f..bcdfc6168dd5 100644
--- a/arch/sparc/kernel/traps_32.c
+++ b/arch/sparc/kernel/traps_32.c
@@ -93,8 +93,6 @@ void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
{
- siginfo_t info;
-
if(type < 0x80) {
/* Sun OS's puke from bad traps, Linux survives! */
printk("Unimplemented Sparc TRAP, type = %02lx\n", type);
@@ -104,13 +102,8 @@ void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
if(regs->psr & PSR_PS)
die_if_kernel("Kernel bad trap", regs);
- clear_siginfo(&info);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLTRP;
- info.si_addr = (void __user *)regs->pc;
- info.si_trapno = type - 0x80;
- force_sig_info(SIGILL, &info, current);
+ force_sig_fault(SIGILL, ILL_ILLTRP,
+ (void __user *)regs->pc, type - 0x80, current);
}
void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
@@ -330,19 +323,11 @@ void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc
void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
- siginfo_t info;
-
#ifdef TRAP_DEBUG
printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
pc, npc, psr);
#endif
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_OBJERR;
- info.si_addr = (void __user *)pc;
- info.si_trapno = 0;
- force_sig_info(SIGBUS, &info, current);
+ force_sig_fault(SIGBUS, BUS_OBJERR, (void __user *)pc, 0, current);
}
void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c
index b485b49b87a8..aa624ed79db1 100644
--- a/arch/sparc/kernel/traps_64.c
+++ b/arch/sparc/kernel/traps_64.c
@@ -87,7 +87,6 @@ static void dump_tl1_traplog(struct tl1_traplog *p)
void bad_trap(struct pt_regs *regs, long lvl)
{
char buffer[36];
- siginfo_t info;
if (notify_die(DIE_TRAP, "bad trap", regs,
0, lvl, SIGTRAP) == NOTIFY_STOP)
@@ -107,13 +106,8 @@ void bad_trap(struct pt_regs *regs, long lvl)
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
- clear_siginfo(&info);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLTRP;
- info.si_addr = (void __user *)regs->tpc;
- info.si_trapno = lvl;
- force_sig_info(SIGILL, &info, current);
+ force_sig_fault(SIGILL, ILL_ILLTRP,
+ (void __user *)regs->tpc, lvl, current);
}
void bad_trap_tl1(struct pt_regs *regs, long lvl)
@@ -192,7 +186,6 @@ EXPORT_SYMBOL_GPL(unregister_dimm_printer);
void spitfire_insn_access_exception(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar)
{
enum ctx_state prev_state = exception_enter();
- siginfo_t info;
if (notify_die(DIE_TRAP, "instruction access exception", regs,
0, 0x8, SIGTRAP) == NOTIFY_STOP)
@@ -207,13 +200,8 @@ void spitfire_insn_access_exception(struct pt_regs *regs, unsigned long sfsr, un
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
- clear_siginfo(&info);
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = SEGV_MAPERR;
- info.si_addr = (void __user *)regs->tpc;
- info.si_trapno = 0;
- force_sig_info(SIGSEGV, &info, current);
+ force_sig_fault(SIGSEGV, SEGV_MAPERR,
+ (void __user *)regs->tpc, 0, current);
out:
exception_exit(prev_state);
}
@@ -232,7 +220,6 @@ void sun4v_insn_access_exception(struct pt_regs *regs, unsigned long addr, unsig
{
unsigned short type = (type_ctx >> 16);
unsigned short ctx = (type_ctx & 0xffff);
- siginfo_t info;
if (notify_die(DIE_TRAP, "instruction access exception", regs,
0, 0x8, SIGTRAP) == NOTIFY_STOP)
@@ -249,13 +236,7 @@ void sun4v_insn_access_exception(struct pt_regs *regs, unsigned long addr, unsig
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
- clear_siginfo(&info);
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = SEGV_MAPERR;
- info.si_addr = (void __user *) addr;
- info.si_trapno = 0;
- force_sig_info(SIGSEGV, &info, current);
+ force_sig_fault(SIGSEGV, SEGV_MAPERR, (void __user *) addr, 0, current);
}
void sun4v_insn_access_exception_tl1(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx)
@@ -310,7 +291,6 @@ bool is_no_fault_exception(struct pt_regs *regs)
void spitfire_data_access_exception(struct pt_regs *regs, unsigned long sfsr, unsigned long sfar)
{
enum ctx_state prev_state = exception_enter();
- siginfo_t info;
if (notify_die(DIE_TRAP, "data access exception", regs,
0, 0x30, SIGTRAP) == NOTIFY_STOP)
@@ -341,13 +321,7 @@ void spitfire_data_access_exception(struct pt_regs *regs, unsigned long sfsr, un
if (is_no_fault_exception(regs))
return;
- clear_siginfo(&info);
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = SEGV_MAPERR;
- info.si_addr = (void __user *)sfar;
- info.si_trapno = 0;
- force_sig_info(SIGSEGV, &info, current);
+ force_sig_fault(SIGSEGV, SEGV_MAPERR, (void __user *)sfar, 0, current);
out:
exception_exit(prev_state);
}
@@ -563,8 +537,6 @@ static void spitfire_cee_log(unsigned long afsr, unsigned long afar, unsigned lo
static void spitfire_ue_log(unsigned long afsr, unsigned long afar, unsigned long udbh, unsigned long udbl, unsigned long tt, int tl1, struct pt_regs *regs)
{
- siginfo_t info;
-
printk(KERN_WARNING "CPU[%d]: Uncorrectable Error AFSR[%lx] "
"AFAR[%lx] UDBL[%lx] UDBH[%ld] TT[%lx] TL>1[%d]\n",
smp_processor_id(), afsr, afar, udbl, udbh, tt, tl1);
@@ -599,13 +571,7 @@ static void spitfire_ue_log(unsigned long afsr, unsigned long afar, unsigned lon
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_OBJERR;
- info.si_addr = (void *)0;
- info.si_trapno = 0;
- force_sig_info(SIGBUS, &info, current);
+ force_sig_fault(SIGBUS, BUS_OBJERR, (void *)0, 0, current);
}
void spitfire_access_error(struct pt_regs *regs, unsigned long status_encoded, unsigned long afar)
@@ -2195,7 +2161,6 @@ bool sun4v_nonresum_error_user_handled(struct pt_regs *regs,
if (attrs & SUN4V_ERR_ATTRS_MEMORY) {
unsigned long addr = ent->err_raddr;
- siginfo_t info;
if (addr == ~(u64)0) {
/* This seems highly unlikely to ever occur */
@@ -2216,23 +2181,13 @@ bool sun4v_nonresum_error_user_handled(struct pt_regs *regs,
addr += PAGE_SIZE;
}
}
- clear_siginfo(&info);
- info.si_signo = SIGKILL;
- info.si_errno = 0;
- info.si_trapno = 0;
- force_sig_info(info.si_signo, &info, current);
+ force_sig(SIGKILL, current);
return true;
}
if (attrs & SUN4V_ERR_ATTRS_PIO) {
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void __user *)sun4v_get_vaddr(regs);
- force_sig_info(info.si_signo, &info, current);
-
+ force_sig_fault(SIGBUS, BUS_ADRERR,
+ (void __user *)sun4v_get_vaddr(regs), 0, current);
return true;
}
@@ -2369,31 +2324,27 @@ static void do_fpe_common(struct pt_regs *regs)
regs->tnpc += 4;
} else {
unsigned long fsr = current_thread_info()->xfsr[0];
- siginfo_t info;
+ int code;
if (test_thread_flag(TIF_32BIT)) {
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
- clear_siginfo(&info);
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_addr = (void __user *)regs->tpc;
- info.si_trapno = 0;
- info.si_code = FPE_FLTUNK;
+ code = FPE_FLTUNK;
if ((fsr & 0x1c000) == (1 << 14)) {
if (fsr & 0x10)
- info.si_code = FPE_FLTINV;
+ code = FPE_FLTINV;
else if (fsr & 0x08)
- info.si_code = FPE_FLTOVF;
+ code = FPE_FLTOVF;
else if (fsr & 0x04)
- info.si_code = FPE_FLTUND;
+ code = FPE_FLTUND;
else if (fsr & 0x02)
- info.si_code = FPE_FLTDIV;
+ code = FPE_FLTDIV;
else if (fsr & 0x01)
- info.si_code = FPE_FLTRES;
+ code = FPE_FLTRES;
}
- force_sig_info(SIGFPE, &info, current);
+ force_sig_fault(SIGFPE, code,
+ (void __user *)regs->tpc, 0, current);
}
}
@@ -2436,7 +2387,6 @@ void do_fpother(struct pt_regs *regs)
void do_tof(struct pt_regs *regs)
{
enum ctx_state prev_state = exception_enter();
- siginfo_t info;
if (notify_die(DIE_TRAP, "tagged arithmetic overflow", regs,
0, 0x26, SIGEMT) == NOTIFY_STOP)
@@ -2448,13 +2398,8 @@ void do_tof(struct pt_regs *regs)
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
- clear_siginfo(&info);
- info.si_signo = SIGEMT;
- info.si_errno = 0;
- info.si_code = EMT_TAGOVF;
- info.si_addr = (void __user *)regs->tpc;
- info.si_trapno = 0;
- force_sig_info(SIGEMT, &info, current);
+ force_sig_fault(SIGEMT, EMT_TAGOVF,
+ (void __user *)regs->tpc, 0, current);
out:
exception_exit(prev_state);
}
@@ -2462,7 +2407,6 @@ void do_tof(struct pt_regs *regs)
void do_div0(struct pt_regs *regs)
{
enum ctx_state prev_state = exception_enter();
- siginfo_t info;
if (notify_die(DIE_TRAP, "integer division by zero", regs,
0, 0x28, SIGFPE) == NOTIFY_STOP)
@@ -2474,13 +2418,8 @@ void do_div0(struct pt_regs *regs)
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
- clear_siginfo(&info);
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_code = FPE_INTDIV;
- info.si_addr = (void __user *)regs->tpc;
- info.si_trapno = 0;
- force_sig_info(SIGFPE, &info, current);
+ force_sig_fault(SIGFPE, FPE_INTDIV,
+ (void __user *)regs->tpc, 0, current);
out:
exception_exit(prev_state);
}
@@ -2642,7 +2581,6 @@ void do_illegal_instruction(struct pt_regs *regs)
unsigned long pc = regs->tpc;
unsigned long tstate = regs->tstate;
u32 insn;
- siginfo_t info;
if (notify_die(DIE_TRAP, "illegal instruction", regs,
0, 0x10, SIGILL) == NOTIFY_STOP)
@@ -2676,13 +2614,7 @@ void do_illegal_instruction(struct pt_regs *regs)
}
}
}
- clear_siginfo(&info);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLOPC;
- info.si_addr = (void __user *)pc;
- info.si_trapno = 0;
- force_sig_info(SIGILL, &info, current);
+ force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)pc, 0, current);
out:
exception_exit(prev_state);
}
@@ -2690,7 +2622,6 @@ void do_illegal_instruction(struct pt_regs *regs)
void mem_address_unaligned(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr)
{
enum ctx_state prev_state = exception_enter();
- siginfo_t info;
if (notify_die(DIE_TRAP, "memory address unaligned", regs,
0, 0x34, SIGSEGV) == NOTIFY_STOP)
@@ -2703,21 +2634,13 @@ void mem_address_unaligned(struct pt_regs *regs, unsigned long sfar, unsigned lo
if (is_no_fault_exception(regs))
return;
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRALN;
- info.si_addr = (void __user *)sfar;
- info.si_trapno = 0;
- force_sig_info(SIGBUS, &info, current);
+ force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)sfar, 0, current);
out:
exception_exit(prev_state);
}
void sun4v_do_mna(struct pt_regs *regs, unsigned long addr, unsigned long type_ctx)
{
- siginfo_t info;
-
if (notify_die(DIE_TRAP, "memory address unaligned", regs,
0, 0x34, SIGSEGV) == NOTIFY_STOP)
return;
@@ -2729,13 +2652,7 @@ void sun4v_do_mna(struct pt_regs *regs, unsigned long addr, unsigned long type_c
if (is_no_fault_exception(regs))
return;
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRALN;
- info.si_addr = (void __user *) addr;
- info.si_trapno = 0;
- force_sig_info(SIGBUS, &info, current);
+ force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *) addr, 0, current);
}
/* sun4v_mem_corrupt_detect_precise() - Handle precise exception on an ADI
@@ -2788,7 +2705,6 @@ void sun4v_mem_corrupt_detect_precise(struct pt_regs *regs, unsigned long addr,
void do_privop(struct pt_regs *regs)
{
enum ctx_state prev_state = exception_enter();
- siginfo_t info;
if (notify_die(DIE_TRAP, "privileged operation", regs,
0, 0x11, SIGILL) == NOTIFY_STOP)
@@ -2798,13 +2714,8 @@ void do_privop(struct pt_regs *regs)
regs->tpc &= 0xffffffff;
regs->tnpc &= 0xffffffff;
}
- clear_siginfo(&info);
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_PRVOPC;
- info.si_addr = (void __user *)regs->tpc;
- info.si_trapno = 0;
- force_sig_info(SIGILL, &info, current);
+ force_sig_fault(SIGILL, ILL_PRVOPC,
+ (void __user *)regs->tpc, 0, current);
out:
exception_exit(prev_state);
}
diff --git a/arch/sparc/mm/fault_32.c b/arch/sparc/mm/fault_32.c
index 2deb586665b9..9f75b6444bf1 100644
--- a/arch/sparc/mm/fault_32.c
+++ b/arch/sparc/mm/fault_32.c
@@ -127,20 +127,11 @@ show_signal_msg(struct pt_regs *regs, int sig, int code,
static void __do_fault_siginfo(int code, int sig, struct pt_regs *regs,
unsigned long addr)
{
- siginfo_t info;
-
- clear_siginfo(&info);
- info.si_signo = sig;
- info.si_code = code;
- info.si_errno = 0;
- info.si_addr = (void __user *) addr;
- info.si_trapno = 0;
-
if (unlikely(show_unhandled_signals))
- show_signal_msg(regs, sig, info.si_code,
+ show_signal_msg(regs, sig, code,
addr, current);
- force_sig_info (sig, &info, current);
+ force_sig_fault(sig, code, (void __user *) addr, 0, current);
}
static unsigned long compute_si_addr(struct pt_regs *regs, int text_fault)
diff --git a/arch/sparc/mm/fault_64.c b/arch/sparc/mm/fault_64.c
index 46ccff95d10e..63166fcf9e25 100644
--- a/arch/sparc/mm/fault_64.c
+++ b/arch/sparc/mm/fault_64.c
@@ -170,12 +170,7 @@ static void do_fault_siginfo(int code, int sig, struct pt_regs *regs,
int fault_code)
{
unsigned long addr;
- siginfo_t info;
- clear_siginfo(&info);
- info.si_code = code;
- info.si_signo = sig;
- info.si_errno = 0;
if (fault_code & FAULT_CODE_ITLB) {
addr = regs->tpc;
} else {
@@ -188,13 +183,11 @@ static void do_fault_siginfo(int code, int sig, struct pt_regs *regs,
else
addr = fault_addr;
}
- info.si_addr = (void __user *) addr;
- info.si_trapno = 0;
if (unlikely(show_unhandled_signals))
show_signal_msg(regs, sig, code, addr, current);
- force_sig_info(sig, &info, current);
+ force_sig_fault(sig, code, (void __user *) addr, 0, current);
}
static unsigned int get_fault_insn(struct pt_regs *regs, unsigned int insn)
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 19/22] signal/um: Use force_sig_fault in relay_signal.
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (17 preceding siblings ...)
2018-04-20 14:38 ` [REVIEW][PATCH 18/22] signal/sparc: Use force_sig_fault " Eric W. Biederman
@ 2018-04-20 14:38 ` Eric W. Biederman
2018-04-20 16:06 ` [uml-devel] " Anton Ivanov
2018-04-20 14:38 ` [REVIEW][PATCH 20/22] signal/um: Use force_sig_fault where appropriate Eric W. Biederman
` (2 subsequent siblings)
21 siblings, 1 reply; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:38 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Jeff Dike, Richard Weinberger,
user-mode-linux-devel
Today user mode linux only works on x86 and x86_64 and this allows
simplifications of relay_signal.
- x86 always set si_errno to 0 in fault handlers.
- x86 does not implement si_trapno.
- Only si_codes between SI_USER and SI_KERNEL have a fault address.
Therefore warn if si_errno is set (it should never be).
Use force_sig_info in the case where we know we have a good fault.
For signals whose content it is not clear how to relay use plain
force_sig and let the signal sending code come up with an
appropriate generic siginfo.
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: user-mode-linux-devel@lists.sourceforge.net
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/um/kernel/trap.c | 28 +++++++++++++---------------
1 file changed, 13 insertions(+), 15 deletions(-)
diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index d4d38520c4c6..5f0ff17cd790 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -296,9 +296,6 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs *regs)
{
- struct faultinfo *fi;
- struct siginfo clean_si;
-
if (!UPT_IS_USER(regs)) {
if (sig == SIGBUS)
printk(KERN_ERR "Bus error - the host /dev/shm or /tmp "
@@ -308,29 +305,30 @@ void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs *regs)
arch_examine_signal(sig, regs);
- clear_siginfo(&clean_si);
- clean_si.si_signo = si->si_signo;
- clean_si.si_errno = si->si_errno;
- clean_si.si_code = si->si_code;
+ if (unlikely(si->si_errno)) {
+ printk(KERN_ERR "Attempted to relay signal %d (si_code = %d) with errno %d\n",
+ sig, si->si_code, si->si_errno);
+ }
switch (sig) {
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
case SIGTRAP:
- fi = UPT_FAULTINFO(regs);
- clean_si.si_addr = (void __user *) FAULT_ADDRESS(*fi);
- current->thread.arch.faultinfo = *fi;
-#ifdef __ARCH_SI_TRAPNO
- clean_si.si_trapno = si->si_trapno;
-#endif
- break;
+ if ((si->si_code > SI_USER) && (si->si_code < SI_KERNEL)) {
+ struct faultinfo *fi = UPT_FAULTINFO(regs);
+ current->thread.arch.faultinfo = *fi;
+ force_sig_fault(sig, si->si_code,
+ (void __user *)FAULT_ADDRESS(*fi),
+ current);
+ break;
+ }
default:
printk(KERN_ERR "Attempted to relay unknown signal %d (si_code = %d)\n",
sig, si->si_code);
}
- force_sig_info(sig, &clean_si, current);
+ force_sig(sig, current);
}
void bus_handler(int sig, struct siginfo *si, struct uml_pt_regs *regs)
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* Re: [uml-devel] [REVIEW][PATCH 19/22] signal/um: Use force_sig_fault in relay_signal.
2018-04-20 14:38 ` [REVIEW][PATCH 19/22] signal/um: Use force_sig_fault in relay_signal Eric W. Biederman
@ 2018-04-20 16:06 ` Anton Ivanov
2018-04-24 8:32 ` Richard Weinberger
0 siblings, 1 reply; 77+ messages in thread
From: Anton Ivanov @ 2018-04-20 16:06 UTC (permalink / raw)
To: Eric W. Biederman, linux-arch
Cc: Richard Weinberger, Jeff Dike, linux-kernel, linux-um,
user-mode-linux-devel
On 04/20/18 15:38, Eric W. Biederman wrote:
> Today user mode linux only works on x86 and x86_64 and this allows
> simplifications of relay_signal.
I believe someone recently fixed the ARM port. I have not had the time
to try the fixes though.
I have added the new list we are migrating to the cc list.
A.
>
> - x86 always set si_errno to 0 in fault handlers.
> - x86 does not implement si_trapno.
> - Only si_codes between SI_USER and SI_KERNEL have a fault address.
>
> Therefore warn if si_errno is set (it should never be).
> Use force_sig_info in the case where we know we have a good fault.
>
> For signals whose content it is not clear how to relay use plain
> force_sig and let the signal sending code come up with an
> appropriate generic siginfo.
>
> Cc: Jeff Dike <jdike@addtoit.com>
> Cc: Richard Weinberger <richard@nod.at>
> Cc: user-mode-linux-devel@lists.sourceforge.net
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
> ---
> arch/um/kernel/trap.c | 28 +++++++++++++---------------
> 1 file changed, 13 insertions(+), 15 deletions(-)
>
> diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
> index d4d38520c4c6..5f0ff17cd790 100644
> --- a/arch/um/kernel/trap.c
> +++ b/arch/um/kernel/trap.c
> @@ -296,9 +296,6 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
>
> void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs *regs)
> {
> - struct faultinfo *fi;
> - struct siginfo clean_si;
> -
> if (!UPT_IS_USER(regs)) {
> if (sig == SIGBUS)
> printk(KERN_ERR "Bus error - the host /dev/shm or /tmp "
> @@ -308,29 +305,30 @@ void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs *regs)
>
> arch_examine_signal(sig, regs);
>
> - clear_siginfo(&clean_si);
> - clean_si.si_signo = si->si_signo;
> - clean_si.si_errno = si->si_errno;
> - clean_si.si_code = si->si_code;
> + if (unlikely(si->si_errno)) {
> + printk(KERN_ERR "Attempted to relay signal %d (si_code = %d) with errno %d\n",
> + sig, si->si_code, si->si_errno);
> + }
> switch (sig) {
> case SIGILL:
> case SIGFPE:
> case SIGSEGV:
> case SIGBUS:
> case SIGTRAP:
> - fi = UPT_FAULTINFO(regs);
> - clean_si.si_addr = (void __user *) FAULT_ADDRESS(*fi);
> - current->thread.arch.faultinfo = *fi;
> -#ifdef __ARCH_SI_TRAPNO
> - clean_si.si_trapno = si->si_trapno;
> -#endif
> - break;
> + if ((si->si_code > SI_USER) && (si->si_code < SI_KERNEL)) {
> + struct faultinfo *fi = UPT_FAULTINFO(regs);
> + current->thread.arch.faultinfo = *fi;
> + force_sig_fault(sig, si->si_code,
> + (void __user *)FAULT_ADDRESS(*fi),
> + current);
> + break;
> + }
> default:
> printk(KERN_ERR "Attempted to relay unknown signal %d (si_code = %d)\n",
> sig, si->si_code);
> }
>
> - force_sig_info(sig, &clean_si, current);
> + force_sig(sig, current);
> }
>
> void bus_handler(int sig, struct siginfo *si, struct uml_pt_regs *regs)
^ permalink raw reply [flat|nested] 77+ messages in thread* Re: [uml-devel] [REVIEW][PATCH 19/22] signal/um: Use force_sig_fault in relay_signal.
2018-04-20 16:06 ` [uml-devel] " Anton Ivanov
@ 2018-04-24 8:32 ` Richard Weinberger
2018-04-24 8:44 ` Anton Ivanov
0 siblings, 1 reply; 77+ messages in thread
From: Richard Weinberger @ 2018-04-24 8:32 UTC (permalink / raw)
To: Anton Ivanov
Cc: Eric W. Biederman, Linux-Arch, Richard Weinberger, Jeff Dike,
linux-um, LKML, user-mode-linux-devel
On Fri, Apr 20, 2018 at 6:06 PM, Anton Ivanov
<anton.ivanov@kot-begemot.co.uk> wrote:
>
> On 04/20/18 15:38, Eric W. Biederman wrote:
>>
>> Today user mode linux only works on x86 and x86_64 and this allows
>> simplifications of relay_signal.
>
>
> I believe someone recently fixed the ARM port. I have not had the time to
> try the fixes though.
Huh? UML is for ages x86 only.
--
Thanks,
//richard
^ permalink raw reply [flat|nested] 77+ messages in thread
* Re: [uml-devel] [REVIEW][PATCH 19/22] signal/um: Use force_sig_fault in relay_signal.
2018-04-24 8:32 ` Richard Weinberger
@ 2018-04-24 8:44 ` Anton Ivanov
2018-04-24 15:59 ` Eric W. Biederman
0 siblings, 1 reply; 77+ messages in thread
From: Anton Ivanov @ 2018-04-24 8:44 UTC (permalink / raw)
To: Richard Weinberger
Cc: Eric W. Biederman, Linux-Arch, Richard Weinberger, Jeff Dike,
linux-um, LKML, user-mode-linux-devel
Hi Richard,
There was a post to uml-devel during the days when the sourceforge
mailing list was working in random drop mode which claimed that "this
fixes the arm build".
I have not kept it locally and I do not see it the archive (I do not see
a few other posts there either - including some of mine).
The joys of having a broken list :(
Whoever posted it, if you are reading it, please re-post again so we can
have a look.
In the meantime we are as you said - x86 only.
A.
On 04/24/18 09:32, Richard Weinberger wrote:
> On Fri, Apr 20, 2018 at 6:06 PM, Anton Ivanov
> <anton.ivanov@kot-begemot.co.uk> wrote:
>> On 04/20/18 15:38, Eric W. Biederman wrote:
>>> Today user mode linux only works on x86 and x86_64 and this allows
>>> simplifications of relay_signal.
>>
>> I believe someone recently fixed the ARM port. I have not had the time to
>> try the fixes though.
> Huh? UML is for ages x86 only.
>
^ permalink raw reply [flat|nested] 77+ messages in thread
* Re: [uml-devel] [REVIEW][PATCH 19/22] signal/um: Use force_sig_fault in relay_signal.
2018-04-24 8:44 ` Anton Ivanov
@ 2018-04-24 15:59 ` Eric W. Biederman
[not found] ` <CAMD8JhwgcWCp6c=O4-spNW1VdY5M-eAjr7M5PieeAfeTSe_4yw@mail.gmail.com>
0 siblings, 1 reply; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-24 15:59 UTC (permalink / raw)
To: Anton Ivanov
Cc: Richard Weinberger, Linux-Arch, Richard Weinberger, Jeff Dike,
linux-um, LKML, user-mode-linux-devel, Martin Pärtel
Sigh I should have Cc'd Martin Partel as well as this bit is his
original code.
Anton Ivanov <anton.ivanov@kot-begemot.co.uk> writes:
> Hi Richard,
>
> There was a post to uml-devel during the days when the sourceforge mailing list
> was working in random drop mode which claimed that "this fixes the arm build".
>
> I have not kept it locally and I do not see it the archive (I do not see a few
> other posts there either - including some of mine).
>
> The joys of having a broken list :(
>
> Whoever posted it, if you are reading it, please re-post again so we can have a
> look.
>
> In the meantime we are as you said - x86 only.
The only case I can see my changed relay_signal affecting on arm is the
nasty hach where errno is set in conjunction with trap_trace.
Having a second look I really don't understand what relay_signal is
trying to do.
The function relay_signal does not pass siginfo through unchanged.
The function relay_signal does not handle cases where si_code is
not SI_USER or SI_KERNEL, or any of the other signal independent
si_codes.
In my change I believe I have preserved the character of relay_signal of
just passing through the fault.
Still even after reading the commit that upgraded relay_signal to
preserve si_code and si_addr I really don't understand the intended
logic.
Am I missing something subtle or have the subtle details of siginfo just
always been ignored?
commit d3c1cfcdb43e023ab1b1c7a555cd9e929026500a
Author: Martin Pärtel <martin.partel@gmail.com>
Date: Thu Aug 2 00:49:17 2012 +0200
um: pass siginfo to guest process
UML guest processes now get correct siginfo_t for SIGTRAP, SIGFPE,
SIGILL and SIGBUS. Specifically, si_addr and si_code are now correct
where previously they were si_addr = NULL and si_code = 128.
Signed-off-by: Martin Pärtel <martin.partel@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Eric
^ permalink raw reply [flat|nested] 77+ messages in thread
* [REVIEW][PATCH 20/22] signal/um: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (18 preceding siblings ...)
2018-04-20 14:38 ` [REVIEW][PATCH 19/22] signal/um: Use force_sig_fault in relay_signal Eric W. Biederman
@ 2018-04-20 14:38 ` Eric W. Biederman
2018-04-20 14:38 ` [REVIEW][PATCH 21/22] signal/xtensa: Consistenly use SIGBUS in do_unaligned_user Eric W. Biederman
2018-04-20 14:38 ` [REVIEW][PATCH 22/22] signal/xtensa: Use force_sig_fault where appropriate Eric W. Biederman
21 siblings, 0 replies; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:38 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Jeff Dike, Richard Weinberger,
user-mode-linux-devel
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: user-mode-linux-devel@lists.sourceforge.net
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/um/kernel/ptrace.c | 13 +++----------
arch/um/kernel/trap.c | 26 ++++++++------------------
2 files changed, 11 insertions(+), 28 deletions(-)
diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
index bc2a516c190f..1a1d88a4d940 100644
--- a/arch/um/kernel/ptrace.c
+++ b/arch/um/kernel/ptrace.c
@@ -115,17 +115,10 @@ long arch_ptrace(struct task_struct *child, long request,
static void send_sigtrap(struct task_struct *tsk, struct uml_pt_regs *regs,
int error_code)
{
- struct siginfo info;
-
- memset(&info, 0, sizeof(info));
- info.si_signo = SIGTRAP;
- info.si_code = TRAP_BRKPT;
-
- /* User-mode eip? */
- info.si_addr = UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL;
-
/* Send us the fake SIGTRAP */
- force_sig_info(SIGTRAP, &info, tsk);
+ force_sig_fault(SIGTRAP, TRAP_BRKPT,
+ /* User-mode eip? */
+ UPT_IS_USER(regs) ? (void __user *) UPT_IP(regs) : NULL, tsk);
}
/*
diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c
index 5f0ff17cd790..48b70dcb6963 100644
--- a/arch/um/kernel/trap.c
+++ b/arch/um/kernel/trap.c
@@ -162,14 +162,9 @@ static void show_segv_info(struct uml_pt_regs *regs)
static void bad_segv(struct faultinfo fi, unsigned long ip)
{
- struct siginfo si;
-
- clear_siginfo(&si);
- si.si_signo = SIGSEGV;
- si.si_code = SEGV_ACCERR;
- si.si_addr = (void __user *) FAULT_ADDRESS(fi);
current->thread.arch.faultinfo = fi;
- force_sig_info(SIGSEGV, &si, current);
+ force_sig_fault(SIGSEGV, SEGV_ACCERR, (void __user *) FAULT_ADDRESS(fi),
+ current);
}
void fatal_sigsegv(void)
@@ -215,13 +210,12 @@ void segv_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs)
unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
struct uml_pt_regs *regs)
{
- struct siginfo si;
jmp_buf *catcher;
+ int si_code;
int err;
int is_write = FAULT_WRITE(fi);
unsigned long address = FAULT_ADDRESS(fi);
- clear_siginfo(&si);
if (!is_user && regs)
current->thread.segv_regs = container_of(regs, struct pt_regs, regs);
@@ -241,7 +235,7 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
if (SEGV_IS_FIXABLE(&fi))
err = handle_page_fault(address, ip, is_write, is_user,
- &si.si_code);
+ &si_code);
else {
err = -EFAULT;
/*
@@ -273,18 +267,14 @@ unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
show_segv_info(regs);
if (err == -EACCES) {
- si.si_signo = SIGBUS;
- si.si_errno = 0;
- si.si_code = BUS_ADRERR;
- si.si_addr = (void __user *)address;
current->thread.arch.faultinfo = fi;
- force_sig_info(SIGBUS, &si, current);
+ force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address,
+ current);
} else {
BUG_ON(err != -EFAULT);
- si.si_signo = SIGSEGV;
- si.si_addr = (void __user *) address;
current->thread.arch.faultinfo = fi;
- force_sig_info(SIGSEGV, &si, current);
+ force_sig_fault(SIGSEGV, si_code, (void __user *) address,
+ current);
}
out:
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* [REVIEW][PATCH 21/22] signal/xtensa: Consistenly use SIGBUS in do_unaligned_user
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (19 preceding siblings ...)
2018-04-20 14:38 ` [REVIEW][PATCH 20/22] signal/um: Use force_sig_fault where appropriate Eric W. Biederman
@ 2018-04-20 14:38 ` Eric W. Biederman
2018-04-20 16:06 ` Max Filippov
2018-04-20 14:38 ` [REVIEW][PATCH 22/22] signal/xtensa: Use force_sig_fault where appropriate Eric W. Biederman
21 siblings, 1 reply; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:38 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Chris Zankel, Max Filippov,
linux-xtensa, stable
While working on changing this code to use force_sig_fault I
discovered that do_unaliged_user is sets si_signo to SIGBUS and passes
SIGSEGV to force_sig_info. Which is just b0rked.
The code is reporting a SIGBUS error so replace the SIGSEGV with SIGBUS.
Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: linux-xtensa@linux-xtensa.org
Cc: stable@vger.kernel.org
Fixes: 5a0015d62668 ("[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 3")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/xtensa/kernel/traps.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 51771929f341..90b509f65b6f 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -339,7 +339,7 @@ do_unaligned_user (struct pt_regs *regs)
info.si_errno = 0;
info.si_code = BUS_ADRALN;
info.si_addr = (void *) regs->excvaddr;
- force_sig_info(SIGSEGV, &info, current);
+ force_sig_info(SIGBUS, &info, current);
}
#endif
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 21/22] signal/xtensa: Consistenly use SIGBUS in do_unaligned_user
2018-04-20 14:38 ` [REVIEW][PATCH 21/22] signal/xtensa: Consistenly use SIGBUS in do_unaligned_user Eric W. Biederman
@ 2018-04-20 16:06 ` Max Filippov
0 siblings, 0 replies; 77+ messages in thread
From: Max Filippov @ 2018-04-20 16:06 UTC (permalink / raw)
To: Eric W. Biederman; +Cc: Linux-Arch, LKML, Chris Zankel, linux-xtensa, stable
On Fri, Apr 20, 2018 at 7:38 AM, Eric W. Biederman
<ebiederm@xmission.com> wrote:
> While working on changing this code to use force_sig_fault I
> discovered that do_unaliged_user is sets si_signo to SIGBUS and passes
> SIGSEGV to force_sig_info. Which is just b0rked.
>
> The code is reporting a SIGBUS error so replace the SIGSEGV with SIGBUS.
>
> Cc: Chris Zankel <chris@zankel.net>
> Cc: Max Filippov <jcmvbkbc@gmail.com>
> Cc: linux-xtensa@linux-xtensa.org
> Cc: stable@vger.kernel.org
> Fixes: 5a0015d62668 ("[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 3")
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
> ---
> arch/xtensa/kernel/traps.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
--
Thanks.
-- Max
^ permalink raw reply [flat|nested] 77+ messages in thread
* [REVIEW][PATCH 22/22] signal/xtensa: Use force_sig_fault where appropriate
2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman
` (20 preceding siblings ...)
2018-04-20 14:38 ` [REVIEW][PATCH 21/22] signal/xtensa: Consistenly use SIGBUS in do_unaligned_user Eric W. Biederman
@ 2018-04-20 14:38 ` Eric W. Biederman
2018-04-20 16:27 ` Max Filippov
21 siblings, 1 reply; 77+ messages in thread
From: Eric W. Biederman @ 2018-04-20 14:38 UTC (permalink / raw)
To: linux-arch
Cc: linux-kernel, Eric W. Biederman, Max Filippov, Chris Zankel,
linux-xtensa
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.
Simplify this process by using the helper force_sig_fault. Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.
In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: linux-xtensa@linux-xtensa.org
Cc: linux-xtensa@linux-xtensa.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/xtensa/kernel/traps.c | 10 +---------
arch/xtensa/mm/fault.c | 19 +++++--------------
2 files changed, 6 insertions(+), 23 deletions(-)
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 90b509f65b6f..86507fa7c2d7 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -323,8 +323,6 @@ do_illegal_instruction(struct pt_regs *regs)
void
do_unaligned_user (struct pt_regs *regs)
{
- siginfo_t info;
-
__die_if_kernel("Unhandled unaligned exception in kernel",
regs, SIGKILL);
@@ -334,13 +332,7 @@ do_unaligned_user (struct pt_regs *regs)
"(pid = %d, pc = %#010lx)\n",
regs->excvaddr, current->comm,
task_pid_nr(current), regs->pc);
- clear_siginfo(&info);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRALN;
- info.si_addr = (void *) regs->excvaddr;
- force_sig_info(SIGBUS, &info, current);
-
+ force_sig_fault(SIGBUS, BUS_ADRALN, (void *) regs->excvaddr, current);
}
#endif
diff --git a/arch/xtensa/mm/fault.c b/arch/xtensa/mm/fault.c
index f9323a3e61ce..c111a833205a 100644
--- a/arch/xtensa/mm/fault.c
+++ b/arch/xtensa/mm/fault.c
@@ -39,14 +39,13 @@ void do_page_fault(struct pt_regs *regs)
struct mm_struct *mm = current->mm;
unsigned int exccause = regs->exccause;
unsigned int address = regs->excvaddr;
- siginfo_t info;
+ int code;
int is_write, is_exec;
int fault;
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
- clear_siginfo(&info);
- info.si_code = SEGV_MAPERR;
+ code = SEGV_MAPERR;
/* We fault-in kernel-space virtual memory on-demand. The
* 'reference' page table is init_mm.pgd.
@@ -92,7 +91,7 @@ void do_page_fault(struct pt_regs *regs)
*/
good_area:
- info.si_code = SEGV_ACCERR;
+ code = SEGV_ACCERR;
if (is_write) {
if (!(vma->vm_flags & VM_WRITE))
@@ -158,11 +157,7 @@ void do_page_fault(struct pt_regs *regs)
if (user_mode(regs)) {
current->thread.bad_vaddr = address;
current->thread.error_code = is_write;
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- /* info.si_code has been set above */
- info.si_addr = (void *) address;
- force_sig_info(SIGSEGV, &info, current);
+ force_sig_fault(SIGSEGV, code, (void *) address, current);
return;
}
bad_page_fault(regs, address, SIGSEGV);
@@ -187,11 +182,7 @@ void do_page_fault(struct pt_regs *regs)
* or user mode.
*/
current->thread.bad_vaddr = address;
- info.si_code = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void *) address;
- force_sig_info(SIGBUS, &info, current);
+ force_sig_fault(SIGBUS, BUS_ADRERR, (void *) address, current);
/* Kernel mode? Handle exceptions or die */
if (!user_mode(regs))
--
2.14.1
^ permalink raw reply related [flat|nested] 77+ messages in thread* Re: [REVIEW][PATCH 22/22] signal/xtensa: Use force_sig_fault where appropriate
2018-04-20 14:38 ` [REVIEW][PATCH 22/22] signal/xtensa: Use force_sig_fault where appropriate Eric W. Biederman
@ 2018-04-20 16:27 ` Max Filippov
0 siblings, 0 replies; 77+ messages in thread
From: Max Filippov @ 2018-04-20 16:27 UTC (permalink / raw)
To: Eric W. Biederman; +Cc: Linux-Arch, LKML, Chris Zankel, linux-xtensa
On Fri, Apr 20, 2018 at 7:38 AM, Eric W. Biederman
<ebiederm@xmission.com> wrote:
> Filling in struct siginfo before calling force_sig_info a tedious and
> error prone process, where once in a great while the wrong fields
> are filled out, and siginfo has been inconsistently cleared.
>
> Simplify this process by using the helper force_sig_fault. Which
> takes as a parameters all of the information it needs, ensures
> all of the fiddly bits of filling in struct siginfo are done properly
> and then calls force_sig_info.
>
> In short about a 5 line reduction in code for every time force_sig_info
> is called, which makes the calling function clearer.
>
> Cc: Max Filippov <jcmvbkbc@gmail.com>
> Cc: Chris Zankel <chris@zankel.net>
> Cc: linux-xtensa@linux-xtensa.org
> Cc: linux-xtensa@linux-xtensa.org
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
> ---
> arch/xtensa/kernel/traps.c | 10 +---------
> arch/xtensa/mm/fault.c | 19 +++++--------------
> 2 files changed, 6 insertions(+), 23 deletions(-)
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
--
Thanks.
-- Max
^ permalink raw reply [flat|nested] 77+ messages in thread