* [PATCH 2/7] take fdpic-related parts of elf_prstatus out
2020-06-30 4:41 ` [PATCH 1/7] unexport linux/elfcore.h Al Viro
@ 2020-06-30 4:41 ` Al Viro
2020-06-30 4:41 ` [PATCH 3/7] kill elf_fpxregs_t Al Viro
` (4 subsequent siblings)
5 siblings, 0 replies; 10+ messages in thread
From: Al Viro @ 2020-06-30 4:41 UTC (permalink / raw)
To: Linus Torvalds
Cc: linux-kernel, Eric W . Biederman, David Howells, Nicolas Pitre
From: Al Viro <viro@zeniv.linux.org.uk>
The only architecture where we might end up using both is arm,
and there we definitely don't want fdpic-related fields in
elf_prstatus - coredump layout of ELF binaries should not
depend upon having the kernel built with the support of ELF_FDPIC
ones. Just move the fdpic-modified variant into binfmt_elf_fdpic.c
(and call it elf_prstatus_fdpic there)
[name stolen from nico]
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/binfmt_elf_fdpic.c | 32 +++++++++++++++++++++++++++++---
include/linux/elfcore-compat.h | 4 ----
include/linux/elfcore.h | 10 ----------
3 files changed, 29 insertions(+), 17 deletions(-)
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 0f45521b237c..6e13d8bea32d 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1189,6 +1189,32 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
*/
#ifdef CONFIG_ELF_CORE
+struct elf_prstatus_fdpic
+{
+ struct elf_siginfo pr_info; /* Info associated with signal */
+ short pr_cursig; /* Current signal */
+ unsigned long pr_sigpend; /* Set of pending signals */
+ unsigned long pr_sighold; /* Set of held signals */
+ pid_t pr_pid;
+ pid_t pr_ppid;
+ pid_t pr_pgrp;
+ pid_t pr_sid;
+ struct __kernel_old_timeval pr_utime; /* User time */
+ struct __kernel_old_timeval pr_stime; /* System time */
+ struct __kernel_old_timeval pr_cutime; /* Cumulative user time */
+ struct __kernel_old_timeval pr_cstime; /* Cumulative system time */
+ elf_gregset_t pr_reg; /* GP registers */
+ /* When using FDPIC, the loadmap addresses need to be communicated
+ * to GDB in order for GDB to do the necessary relocations. The
+ * fields (below) used to communicate this information are placed
+ * immediately after ``pr_reg'', so that the loadmap addresses may
+ * be viewed as part of the register set if so desired.
+ */
+ unsigned long pr_exec_fdpic_loadmap;
+ unsigned long pr_interp_fdpic_loadmap;
+ int pr_fpvalid; /* True if math co-processor being used. */
+};
+
/*
* Decide whether a segment is worth dumping; default is yes to be
* sure (missing info is worse than too much; etc).
@@ -1345,7 +1371,7 @@ static inline void fill_note(struct memelfnote *note, const char *name, int type
* fill up all the fields in prstatus from the given task struct, except
* registers which need to be filled up separately.
*/
-static void fill_prstatus(struct elf_prstatus *prstatus,
+static void fill_prstatus(struct elf_prstatus_fdpic *prstatus,
struct task_struct *p, long signr)
{
prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
@@ -1428,7 +1454,7 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
struct elf_thread_status
{
struct list_head list;
- struct elf_prstatus prstatus; /* NT_PRSTATUS */
+ struct elf_prstatus_fdpic prstatus; /* NT_PRSTATUS */
elf_fpregset_t fpu; /* NT_PRFPREG */
struct task_struct *thread;
#ifdef ELF_CORE_COPY_XFPREGS
@@ -1562,7 +1588,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
loff_t offset = 0, dataoff;
int numnote;
struct memelfnote *notes = NULL;
- struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
+ struct elf_prstatus_fdpic *prstatus = NULL; /* NT_PRSTATUS */
struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
LIST_HEAD(thread_list);
struct list_head *t;
diff --git a/include/linux/elfcore-compat.h b/include/linux/elfcore-compat.h
index 7a37f4ce9fd2..10485f0c9740 100644
--- a/include/linux/elfcore-compat.h
+++ b/include/linux/elfcore-compat.h
@@ -32,10 +32,6 @@ struct compat_elf_prstatus
struct old_timeval32 pr_cutime;
struct old_timeval32 pr_cstime;
compat_elf_gregset_t pr_reg;
-#ifdef CONFIG_BINFMT_ELF_FDPIC
- compat_ulong_t pr_exec_fdpic_loadmap;
- compat_ulong_t pr_interp_fdpic_loadmap;
-#endif
compat_int_t pr_fpvalid;
};
diff --git a/include/linux/elfcore.h b/include/linux/elfcore.h
index 96ab215dad2d..adb8ee89f3fd 100644
--- a/include/linux/elfcore.h
+++ b/include/linux/elfcore.h
@@ -44,16 +44,6 @@ struct elf_prstatus
struct __kernel_old_timeval pr_cutime; /* Cumulative user time */
struct __kernel_old_timeval pr_cstime; /* Cumulative system time */
elf_gregset_t pr_reg; /* GP registers */
-#ifdef CONFIG_BINFMT_ELF_FDPIC
- /* When using FDPIC, the loadmap addresses need to be communicated
- * to GDB in order for GDB to do the necessary relocations. The
- * fields (below) used to communicate this information are placed
- * immediately after ``pr_reg'', so that the loadmap addresses may
- * be viewed as part of the register set if so desired.
- */
- unsigned long pr_exec_fdpic_loadmap;
- unsigned long pr_interp_fdpic_loadmap;
-#endif
int pr_fpvalid; /* True if math co-processor being used. */
};
--
2.11.0
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH 3/7] kill elf_fpxregs_t
2020-06-30 4:41 ` [PATCH 1/7] unexport linux/elfcore.h Al Viro
2020-06-30 4:41 ` [PATCH 2/7] take fdpic-related parts of elf_prstatus out Al Viro
@ 2020-06-30 4:41 ` Al Viro
2020-06-30 4:41 ` [PATCH 4/7] [elf-fdpic] coredump: don't bother with cyclic list for per-thread objects Al Viro
` (3 subsequent siblings)
5 siblings, 0 replies; 10+ messages in thread
From: Al Viro @ 2020-06-30 4:41 UTC (permalink / raw)
To: Linus Torvalds
Cc: linux-kernel, Eric W . Biederman, David Howells, Nicolas Pitre
From: Al Viro <viro@zeniv.linux.org.uk>
all uses are conditional upon ELF_CORE_COPY_XFPREGS, which has not
been defined on any architecture since 2010
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/ia64/include/asm/elf.h | 2 --
arch/powerpc/include/asm/elf.h | 2 --
arch/x86/include/asm/elf.h | 2 --
fs/binfmt_elf.c | 30 ------------------------------
fs/binfmt_elf_fdpic.c | 28 ----------------------------
include/linux/elfcore.h | 7 -------
6 files changed, 71 deletions(-)
diff --git a/arch/ia64/include/asm/elf.h b/arch/ia64/include/asm/elf.h
index c70bb9c11f52..6629301a2620 100644
--- a/arch/ia64/include/asm/elf.h
+++ b/arch/ia64/include/asm/elf.h
@@ -179,8 +179,6 @@ extern void ia64_init_addr_space (void);
#define ELF_AR_SSD_OFFSET (56 * sizeof(elf_greg_t))
#define ELF_AR_END_OFFSET (57 * sizeof(elf_greg_t))
-typedef unsigned long elf_fpxregset_t;
-
typedef unsigned long elf_greg_t;
typedef elf_greg_t elf_gregset_t[ELF_NGREG];
diff --git a/arch/powerpc/include/asm/elf.h b/arch/powerpc/include/asm/elf.h
index 57c229a86f08..53ed2ca40151 100644
--- a/arch/powerpc/include/asm/elf.h
+++ b/arch/powerpc/include/asm/elf.h
@@ -53,8 +53,6 @@ static inline void ppc_elf_core_copy_regs(elf_gregset_t elf_regs,
}
#define ELF_CORE_COPY_REGS(gregs, regs) ppc_elf_core_copy_regs(gregs, regs);
-typedef elf_vrregset_t elf_fpxregset_t;
-
/* ELF_HWCAP yields a mask that user programs can use to figure out what
instruction set this cpu supports. This could be done in userspace,
but it's not easy, and we've already done it here. */
diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
index 452beed7892b..b9a5d488f1a5 100644
--- a/arch/x86/include/asm/elf.h
+++ b/arch/x86/include/asm/elf.h
@@ -21,8 +21,6 @@ typedef struct user_i387_struct elf_fpregset_t;
#ifdef __i386__
-typedef struct user_fxsr_struct elf_fpxregset_t;
-
#define R_386_NONE 0
#define R_386_32 1
#define R_386_PC32 2
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 80743b8957c9..6a171a28bdf7 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -2038,9 +2038,6 @@ struct elf_thread_status
struct elf_prstatus prstatus; /* NT_PRSTATUS */
elf_fpregset_t fpu; /* NT_PRFPREG */
struct task_struct *thread;
-#ifdef ELF_CORE_COPY_XFPREGS
- elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
-#endif
struct memelfnote notes[3];
int num_notes;
};
@@ -2071,15 +2068,6 @@ static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
t->num_notes++;
sz += notesize(&t->notes[1]);
}
-
-#ifdef ELF_CORE_COPY_XFPREGS
- if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
- fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
- sizeof(t->xfpu), &t->xfpu);
- t->num_notes++;
- sz += notesize(&t->notes[2]);
- }
-#endif
return sz;
}
@@ -2090,9 +2078,6 @@ struct elf_note_info {
struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */
struct list_head thread_list;
elf_fpregset_t *fpu;
-#ifdef ELF_CORE_COPY_XFPREGS
- elf_fpxregset_t *xfpu;
-#endif
user_siginfo_t csigdata;
int thread_status_size;
int numnote;
@@ -2116,11 +2101,6 @@ static int elf_note_info_init(struct elf_note_info *info)
info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
if (!info->fpu)
return 0;
-#ifdef ELF_CORE_COPY_XFPREGS
- info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
- if (!info->xfpu)
- return 0;
-#endif
return 1;
}
@@ -2184,13 +2164,6 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
if (info->prstatus->pr_fpvalid)
fill_note(info->notes + info->numnote++,
"CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu);
-#ifdef ELF_CORE_COPY_XFPREGS
- if (elf_core_copy_task_xfpregs(current, info->xfpu))
- fill_note(info->notes + info->numnote++,
- "LINUX", ELF_CORE_XFPREG_TYPE,
- sizeof(*info->xfpu), info->xfpu);
-#endif
-
return 1;
}
@@ -2243,9 +2216,6 @@ static void free_note_info(struct elf_note_info *info)
kfree(info->psinfo);
kfree(info->notes);
kfree(info->fpu);
-#ifdef ELF_CORE_COPY_XFPREGS
- kfree(info->xfpu);
-#endif
}
#endif
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 6e13d8bea32d..a6ee92137529 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1457,9 +1457,6 @@ struct elf_thread_status
struct elf_prstatus_fdpic prstatus; /* NT_PRSTATUS */
elf_fpregset_t fpu; /* NT_PRFPREG */
struct task_struct *thread;
-#ifdef ELF_CORE_COPY_XFPREGS
- elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
-#endif
struct memelfnote notes[3];
int num_notes;
};
@@ -1491,15 +1488,6 @@ static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
t->num_notes++;
sz += notesize(&t->notes[1]);
}
-
-#ifdef ELF_CORE_COPY_XFPREGS
- if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
- fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
- sizeof(t->xfpu), &t->xfpu);
- t->num_notes++;
- sz += notesize(&t->notes[2]);
- }
-#endif
return sz;
}
@@ -1593,9 +1581,6 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
LIST_HEAD(thread_list);
struct list_head *t;
elf_fpregset_t *fpu = NULL;
-#ifdef ELF_CORE_COPY_XFPREGS
- elf_fpxregset_t *xfpu = NULL;
-#endif
int thread_status_size = 0;
elf_addr_t *auxv;
struct elf_phdr *phdr4note = NULL;
@@ -1634,11 +1619,6 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
if (!fpu)
goto end_coredump;
-#ifdef ELF_CORE_COPY_XFPREGS
- xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
- if (!xfpu)
- goto end_coredump;
-#endif
for (ct = current->mm->core_state->dumper.next;
ct; ct = ct->next) {
@@ -1703,11 +1683,6 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
elf_core_copy_task_fpregs(current, cprm->regs, fpu)))
fill_note(notes + numnote++,
"CORE", NT_PRFPREG, sizeof(*fpu), fpu);
-#ifdef ELF_CORE_COPY_XFPREGS
- if (elf_core_copy_task_xfpregs(current, xfpu))
- fill_note(notes + numnote++,
- "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu);
-#endif
offset += sizeof(*elf); /* Elf header */
offset += segs * sizeof(struct elf_phdr); /* Program headers */
@@ -1828,9 +1803,6 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
kfree(notes);
kfree(fpu);
kfree(shdr4extnum);
-#ifdef ELF_CORE_COPY_XFPREGS
- kfree(xfpu);
-#endif
return has_dumped;
#undef NUM_NOTES
}
diff --git a/include/linux/elfcore.h b/include/linux/elfcore.h
index adb8ee89f3fd..46c3d691f677 100644
--- a/include/linux/elfcore.h
+++ b/include/linux/elfcore.h
@@ -104,13 +104,6 @@ static inline int elf_core_copy_task_fpregs(struct task_struct *t, struct pt_reg
#endif
}
-#ifdef ELF_CORE_COPY_XFPREGS
-static inline int elf_core_copy_task_xfpregs(struct task_struct *t, elf_fpxregset_t *xfpu)
-{
- return ELF_CORE_COPY_XFPREGS(t, xfpu);
-}
-#endif
-
/*
* These functions parameterize elf_core_dump in fs/binfmt_elf.c to write out
* extra segments containing the gate DSO contents. Dumping its
--
2.11.0
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH 4/7] [elf-fdpic] coredump: don't bother with cyclic list for per-thread objects
2020-06-30 4:41 ` [PATCH 1/7] unexport linux/elfcore.h Al Viro
2020-06-30 4:41 ` [PATCH 2/7] take fdpic-related parts of elf_prstatus out Al Viro
2020-06-30 4:41 ` [PATCH 3/7] kill elf_fpxregs_t Al Viro
@ 2020-06-30 4:41 ` Al Viro
2020-06-30 4:41 ` [PATCH 5/7] [elf-fdpic] move allocation of elf_thread_status into elf_dump_thread_status() Al Viro
` (2 subsequent siblings)
5 siblings, 0 replies; 10+ messages in thread
From: Al Viro @ 2020-06-30 4:41 UTC (permalink / raw)
To: Linus Torvalds
Cc: linux-kernel, Eric W . Biederman, David Howells, Nicolas Pitre
From: Al Viro <viro@zeniv.linux.org.uk>
plain single-linked list is just fine here...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/binfmt_elf_fdpic.c | 29 +++++++++++------------------
1 file changed, 11 insertions(+), 18 deletions(-)
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index a6ee92137529..bcbf756fba39 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1453,7 +1453,7 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
/* Here is the structure in which status of each thread is captured. */
struct elf_thread_status
{
- struct list_head list;
+ struct elf_thread_status *next;
struct elf_prstatus_fdpic prstatus; /* NT_PRSTATUS */
elf_fpregset_t fpu; /* NT_PRFPREG */
struct task_struct *thread;
@@ -1578,8 +1578,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
struct memelfnote *notes = NULL;
struct elf_prstatus_fdpic *prstatus = NULL; /* NT_PRSTATUS */
struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
- LIST_HEAD(thread_list);
- struct list_head *t;
+ struct elf_thread_status *thread_list = NULL;
elf_fpregset_t *fpu = NULL;
int thread_status_size = 0;
elf_addr_t *auxv;
@@ -1627,15 +1626,12 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
goto end_coredump;
tmp->thread = ct->task;
- list_add(&tmp->list, &thread_list);
+ tmp->next = thread_list;
+ thread_list = tmp;
}
- list_for_each(t, &thread_list) {
- struct elf_thread_status *tmp;
- int sz;
-
- tmp = list_entry(t, struct elf_thread_status, list);
- sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp);
+ for (tmp = thread_list; tmp; tmp = tmp->next) {
+ int sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp);
thread_status_size += sz;
}
@@ -1760,10 +1756,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
goto end_coredump;
/* write out the thread status notes section */
- list_for_each(t, &thread_list) {
- struct elf_thread_status *tmp =
- list_entry(t, struct elf_thread_status, list);
-
+ for (tmp = thread_list; tmp; tmp = tmp->next) {
for (i = 0; i < tmp->num_notes; i++)
if (!writenote(&tmp->notes[i], cprm))
goto end_coredump;
@@ -1791,10 +1784,10 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
}
end_coredump:
- while (!list_empty(&thread_list)) {
- struct list_head *tmp = thread_list.next;
- list_del(tmp);
- kfree(list_entry(tmp, struct elf_thread_status, list));
+ while (thread_list) {
+ tmp = thread_list;
+ thread_list = thread_list->next;
+ kfree(tmp);
}
kfree(phdr4note);
kfree(elf);
--
2.11.0
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH 5/7] [elf-fdpic] move allocation of elf_thread_status into elf_dump_thread_status()
2020-06-30 4:41 ` [PATCH 1/7] unexport linux/elfcore.h Al Viro
` (2 preceding siblings ...)
2020-06-30 4:41 ` [PATCH 4/7] [elf-fdpic] coredump: don't bother with cyclic list for per-thread objects Al Viro
@ 2020-06-30 4:41 ` Al Viro
2020-06-30 4:41 ` [PATCH 6/7] [elf-fdpic] use elf_dump_thread_status() for the dumper thread as well Al Viro
2020-06-30 4:41 ` [PATCH 7/7] [elf-fdpic] switch coredump to regsets Al Viro
5 siblings, 0 replies; 10+ messages in thread
From: Al Viro @ 2020-06-30 4:41 UTC (permalink / raw)
To: Linus Torvalds
Cc: linux-kernel, Eric W . Biederman, David Howells, Nicolas Pitre
From: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/binfmt_elf_fdpic.c | 24 ++++++++++--------------
1 file changed, 10 insertions(+), 14 deletions(-)
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index bcbf756fba39..ba4f264dff3a 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1466,12 +1466,13 @@ struct elf_thread_status
* we need to keep a linked list of every thread's pr_status and then create
* a single section for them in the final core file.
*/
-static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
+static struct elf_thread_status *elf_dump_thread_status(long signr, struct task_struct *p, int *sz)
{
- struct task_struct *p = t->thread;
- int sz = 0;
+ struct elf_thread_status *t;
- t->num_notes = 0;
+ t = kzalloc(sizeof(struct elf_thread_status), GFP_KERNEL);
+ if (!t)
+ return t;
fill_prstatus(&t->prstatus, p, signr);
elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
@@ -1479,16 +1480,16 @@ static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
&t->prstatus);
t->num_notes++;
- sz += notesize(&t->notes[0]);
+ *sz += notesize(&t->notes[0]);
t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
if (t->prstatus.pr_fpvalid) {
fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
&t->fpu);
t->num_notes++;
- sz += notesize(&t->notes[1]);
+ *sz += notesize(&t->notes[1]);
}
- return sz;
+ return t;
}
static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
@@ -1621,20 +1622,15 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
for (ct = current->mm->core_state->dumper.next;
ct; ct = ct->next) {
- tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
+ tmp = elf_dump_thread_status(cprm->siginfo->si_signo,
+ ct->task, &thread_status_size);
if (!tmp)
goto end_coredump;
- tmp->thread = ct->task;
tmp->next = thread_list;
thread_list = tmp;
}
- for (tmp = thread_list; tmp; tmp = tmp->next) {
- int sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp);
- thread_status_size += sz;
- }
-
/* now collect the dump for the current */
fill_prstatus(prstatus, current, cprm->siginfo->si_signo);
elf_core_copy_regs(&prstatus->pr_reg, cprm->regs);
--
2.11.0
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH 6/7] [elf-fdpic] use elf_dump_thread_status() for the dumper thread as well
2020-06-30 4:41 ` [PATCH 1/7] unexport linux/elfcore.h Al Viro
` (3 preceding siblings ...)
2020-06-30 4:41 ` [PATCH 5/7] [elf-fdpic] move allocation of elf_thread_status into elf_dump_thread_status() Al Viro
@ 2020-06-30 4:41 ` Al Viro
2020-06-30 4:41 ` [PATCH 7/7] [elf-fdpic] switch coredump to regsets Al Viro
5 siblings, 0 replies; 10+ messages in thread
From: Al Viro @ 2020-06-30 4:41 UTC (permalink / raw)
To: Linus Torvalds
Cc: linux-kernel, Eric W . Biederman, David Howells, Nicolas Pitre
From: Al Viro <viro@zeniv.linux.org.uk>
the only reason to have it open-coded for the first (dumper) thread is
that coredump has a couple of process-wide notes stuck right after the
first (NT_PRSTATUS) note of the first thread. But we don't need to
make the data collection side irregular for the first thread to handle
that - it's only the logics ordering the calls of writenote() that
needs to take care of that.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/binfmt_elf_fdpic.c | 81 ++++++++++++++++++---------------------------------
1 file changed, 28 insertions(+), 53 deletions(-)
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index ba4f264dff3a..34c45410d587 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1482,7 +1482,8 @@ static struct elf_thread_status *elf_dump_thread_status(long signr, struct task_
t->num_notes++;
*sz += notesize(&t->notes[0]);
- t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
+ t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, task_pt_regs(p),
+ &t->fpu);
if (t->prstatus.pr_fpvalid) {
fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
&t->fpu);
@@ -1568,19 +1569,15 @@ static size_t elf_core_vma_data_size(unsigned long mm_flags)
*/
static int elf_fdpic_core_dump(struct coredump_params *cprm)
{
-#define NUM_NOTES 6
int has_dumped = 0;
int segs;
int i;
struct vm_area_struct *vma;
struct elfhdr *elf = NULL;
loff_t offset = 0, dataoff;
- int numnote;
- struct memelfnote *notes = NULL;
- struct elf_prstatus_fdpic *prstatus = NULL; /* NT_PRSTATUS */
+ struct memelfnote psinfo_note, auxv_note;
struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
struct elf_thread_status *thread_list = NULL;
- elf_fpregset_t *fpu = NULL;
int thread_status_size = 0;
elf_addr_t *auxv;
struct elf_phdr *phdr4note = NULL;
@@ -1606,19 +1603,9 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
elf = kmalloc(sizeof(*elf), GFP_KERNEL);
if (!elf)
goto end_coredump;
- prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
- if (!prstatus)
- goto end_coredump;
psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
if (!psinfo)
goto end_coredump;
- notes = kmalloc_array(NUM_NOTES, sizeof(struct memelfnote),
- GFP_KERNEL);
- if (!notes)
- goto end_coredump;
- fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
- if (!fpu)
- goto end_coredump;
for (ct = current->mm->core_state->dumper.next;
ct; ct = ct->next) {
@@ -1632,8 +1619,12 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
}
/* now collect the dump for the current */
- fill_prstatus(prstatus, current, cprm->siginfo->si_signo);
- elf_core_copy_regs(&prstatus->pr_reg, cprm->regs);
+ tmp = elf_dump_thread_status(cprm->siginfo->si_signo,
+ current, &thread_status_size);
+ if (!tmp)
+ goto end_coredump;
+ tmp->next = thread_list;
+ thread_list = tmp;
segs = current->mm->map_count;
segs += elf_core_extra_phdrs();
@@ -1655,46 +1646,28 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
* with info from their /proc.
*/
- fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
fill_psinfo(psinfo, current->group_leader, current->mm);
- fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
-
- numnote = 2;
+ fill_note(&psinfo_note, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
+ thread_status_size += notesize(&psinfo_note);
auxv = (elf_addr_t *) current->mm->saved_auxv;
-
i = 0;
do
i += 2;
while (auxv[i - 2] != AT_NULL);
- fill_note(¬es[numnote++], "CORE", NT_AUXV,
- i * sizeof(elf_addr_t), auxv);
+ fill_note(&auxv_note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
+ thread_status_size += notesize(&auxv_note);
- /* Try to dump the FPU. */
- if ((prstatus->pr_fpvalid =
- elf_core_copy_task_fpregs(current, cprm->regs, fpu)))
- fill_note(notes + numnote++,
- "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
-
- offset += sizeof(*elf); /* Elf header */
+ offset = sizeof(*elf); /* Elf header */
offset += segs * sizeof(struct elf_phdr); /* Program headers */
/* Write notes phdr entry */
- {
- int sz = 0;
-
- for (i = 0; i < numnote; i++)
- sz += notesize(notes + i);
-
- sz += thread_status_size;
-
- phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
- if (!phdr4note)
- goto end_coredump;
+ phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
+ if (!phdr4note)
+ goto end_coredump;
- fill_elf_note_phdr(phdr4note, sz, offset);
- offset += sz;
- }
+ fill_elf_note_phdr(phdr4note, thread_status_size, offset);
+ offset += thread_status_size;
/* Page-align dumped data */
dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
@@ -1747,12 +1720,18 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
goto end_coredump;
/* write out the notes section */
- for (i = 0; i < numnote; i++)
- if (!writenote(notes + i, cprm))
+ if (!writenote(thread_list->notes, cprm))
+ goto end_coredump;
+ if (!writenote(&psinfo_note, cprm))
+ goto end_coredump;
+ if (!writenote(&auxv_note, cprm))
+ goto end_coredump;
+ for (i = 1; i < thread_list->num_notes; i++)
+ if (!writenote(thread_list->notes + i, cprm))
goto end_coredump;
/* write out the thread status notes section */
- for (tmp = thread_list; tmp; tmp = tmp->next) {
+ for (tmp = thread_list->next; tmp; tmp = tmp->next) {
for (i = 0; i < tmp->num_notes; i++)
if (!writenote(&tmp->notes[i], cprm))
goto end_coredump;
@@ -1787,13 +1766,9 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
}
kfree(phdr4note);
kfree(elf);
- kfree(prstatus);
kfree(psinfo);
- kfree(notes);
- kfree(fpu);
kfree(shdr4extnum);
return has_dumped;
-#undef NUM_NOTES
}
#endif /* CONFIG_ELF_CORE */
--
2.11.0
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH 7/7] [elf-fdpic] switch coredump to regsets
2020-06-30 4:41 ` [PATCH 1/7] unexport linux/elfcore.h Al Viro
` (4 preceding siblings ...)
2020-06-30 4:41 ` [PATCH 6/7] [elf-fdpic] use elf_dump_thread_status() for the dumper thread as well Al Viro
@ 2020-06-30 4:41 ` Al Viro
5 siblings, 0 replies; 10+ messages in thread
From: Al Viro @ 2020-06-30 4:41 UTC (permalink / raw)
To: Linus Torvalds
Cc: linux-kernel, Eric W . Biederman, David Howells, Nicolas Pitre
From: Al Viro <viro@zeniv.linux.org.uk>
similar to how elf coredump is working on architectures that
have regsets, and all architectures with elf-fdpic support *do*
have that.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/binfmt_elf_fdpic.c | 23 ++++++++++++++++++-----
1 file changed, 18 insertions(+), 5 deletions(-)
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 34c45410d587..1af03c8d3c09 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -35,6 +35,7 @@
#include <linux/elfcore.h>
#include <linux/coredump.h>
#include <linux/dax.h>
+#include <linux/regset.h>
#include <linux/uaccess.h>
#include <asm/param.h>
@@ -1456,8 +1457,7 @@ struct elf_thread_status
struct elf_thread_status *next;
struct elf_prstatus_fdpic prstatus; /* NT_PRSTATUS */
elf_fpregset_t fpu; /* NT_PRFPREG */
- struct task_struct *thread;
- struct memelfnote notes[3];
+ struct memelfnote notes[2];
int num_notes;
};
@@ -1468,22 +1468,35 @@ struct elf_thread_status
*/
static struct elf_thread_status *elf_dump_thread_status(long signr, struct task_struct *p, int *sz)
{
+ const struct user_regset_view *view = task_user_regset_view(p);
struct elf_thread_status *t;
+ int i, ret;
t = kzalloc(sizeof(struct elf_thread_status), GFP_KERNEL);
if (!t)
return t;
fill_prstatus(&t->prstatus, p, signr);
- elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
+ regset_get(p, &view->regsets[0],
+ sizeof(t->prstatus.pr_reg), &t->prstatus.pr_reg);
fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
&t->prstatus);
t->num_notes++;
*sz += notesize(&t->notes[0]);
- t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, task_pt_regs(p),
- &t->fpu);
+ for (i = 1; i < view->n; ++i) {
+ const struct user_regset *regset = &view->regsets[i];
+ if (regset->core_note_type != NT_PRFPREG)
+ continue;
+ if (regset->active && regset->active(p, regset) <= 0)
+ continue;
+ ret = regset_get(p, regset, sizeof(t->fpu), &t->fpu);
+ if (ret >= 0)
+ t->prstatus.pr_fpvalid = 1;
+ break;
+ }
+
if (t->prstatus.pr_fpvalid) {
fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
&t->fpu);
--
2.11.0
^ permalink raw reply related [flat|nested] 10+ messages in thread