From: "Eric W. Biederman" <ebiederm@xmission.com> To: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, "Eric W. Biederman" <ebiederm@xmission.com>, Yoshinori Sato <ysato@users.sourceforge.jp>, Rich Felker <dalias@libc.org>, Paul Mundt <lethal@linux-sh.org>, linux-sh@vger.kernel.org Subject: [REVIEW][PATCH 03/17] signal/sh: Use force_sig_fault in hw_breakpoint_handler Date: Fri, 20 Apr 2018 01:03:54 +0000 [thread overview] Message-ID: <20180420010408.24438-3-ebiederm@xmission.com> (raw) In-Reply-To: <878t9ilmhv.fsf@xmission.com> The call chain is: breakpoint notify_die hw_breakpoint_exceptions_notify hw_breakpoint_handler So the signal number can only be SIGTRAP. In hw_breakpoint_handler rc is either NOTIFY_STOP or NOTIF_DONE both of which notifier_to_errno converts to 0. So si_errno is 0. Historically si_addr was left unitialized in struct siginfo which is a bug. There appears to be no consensus among the various architectures which value should be in si_addr. So since no usable value has been returned up to this point return NULL in si_addr. Fixes: 4352fc1b12fa ("sh: Abstracted SH-4A UBC support on hw-breakpoint core.") Fixes: 34d0b5af50a0 ("sh: Convert ptrace to hw_breakpoint API.") Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Rich Felker <dalias@libc.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: linux-sh@vger.kernel.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> --- arch/sh/kernel/hw_breakpoint.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/arch/sh/kernel/hw_breakpoint.c b/arch/sh/kernel/hw_breakpoint.c index afe965712a69..8648ed05ccf0 100644 --- a/arch/sh/kernel/hw_breakpoint.c +++ b/arch/sh/kernel/hw_breakpoint.c @@ -347,13 +347,8 @@ static int __kprobes hw_breakpoint_handler(struct die_args *args) /* Deliver the signal to userspace */ if (!arch_check_bp_in_kernelspace(bp)) { - siginfo_t info; - - info.si_signo = args->signr; - info.si_errno = notifier_to_errno(rc); - info.si_code = TRAP_HWBKPT; - - force_sig_info(args->signr, &info, current); + force_sig_fault(SIGTRAP, TRAP_HWBKPT, + (void __user *)NULL, current); } rcu_read_unlock(); -- 2.14.1
WARNING: multiple messages have this Message-ID (diff)
From: "Eric W. Biederman" <ebiederm@xmission.com> To: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, "Eric W. Biederman" <ebiederm@xmission.com>, Yoshinori Sato <ysato@users.sourceforge.jp>, Rich Felker <dalias@libc.org>, Paul Mundt <lethal@linux-sh.org>, linux-sh@vger.kernel.org Subject: [REVIEW][PATCH 03/17] signal/sh: Use force_sig_fault in hw_breakpoint_handler Date: Thu, 19 Apr 2018 20:03:54 -0500 [thread overview] Message-ID: <20180420010408.24438-3-ebiederm@xmission.com> (raw) In-Reply-To: <878t9ilmhv.fsf@xmission.com> The call chain is: breakpoint notify_die hw_breakpoint_exceptions_notify hw_breakpoint_handler So the signal number can only be SIGTRAP. In hw_breakpoint_handler rc is either NOTIFY_STOP or NOTIF_DONE both of which notifier_to_errno converts to 0. So si_errno is 0. Historically si_addr was left unitialized in struct siginfo which is a bug. There appears to be no consensus among the various architectures which value should be in si_addr. So since no usable value has been returned up to this point return NULL in si_addr. Fixes: 4352fc1b12fa ("sh: Abstracted SH-4A UBC support on hw-breakpoint core.") Fixes: 34d0b5af50a0 ("sh: Convert ptrace to hw_breakpoint API.") Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Rich Felker <dalias@libc.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: linux-sh@vger.kernel.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> --- arch/sh/kernel/hw_breakpoint.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/arch/sh/kernel/hw_breakpoint.c b/arch/sh/kernel/hw_breakpoint.c index afe965712a69..8648ed05ccf0 100644 --- a/arch/sh/kernel/hw_breakpoint.c +++ b/arch/sh/kernel/hw_breakpoint.c @@ -347,13 +347,8 @@ static int __kprobes hw_breakpoint_handler(struct die_args *args) /* Deliver the signal to userspace */ if (!arch_check_bp_in_kernelspace(bp)) { - siginfo_t info; - - info.si_signo = args->signr; - info.si_errno = notifier_to_errno(rc); - info.si_code = TRAP_HWBKPT; - - force_sig_info(args->signr, &info, current); + force_sig_fault(SIGTRAP, TRAP_HWBKPT, + (void __user *)NULL, current); } rcu_read_unlock(); -- 2.14.1
next prev parent reply other threads:[~2018-04-20 1:03 UTC|newest] Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-04-20 1:01 [REVIEW][PATCH 00/17] siginfo bugfixes and cleanups Eric W. Biederman 2018-04-20 1:01 ` Eric W. Biederman 2018-04-20 1:03 ` [REVIEW][PATCH 01/17] signal/alpha: Document a conflict with SI_USER for SIGFPE Eric W. Biederman 2018-04-20 1:03 ` [REVIEW][PATCH 02/17] sparc: fix compat siginfo ABI regression Eric W. Biederman 2018-04-20 1:03 ` Eric W. Biederman 2018-04-20 1:03 ` Eric W. Biederman [this message] 2018-04-20 1:03 ` [REVIEW][PATCH 03/17] signal/sh: Use force_sig_fault in hw_breakpoint_handler Eric W. Biederman 2018-04-20 1:03 ` [REVIEW][PATCH 04/17] signal/nds32: Use force_sig in unhandled_interruption and unhandled_exceptions Eric W. Biederman 2018-04-25 12:14 ` Vincent Chen 2018-04-20 1:03 ` [REVIEW][PATCH 05/17] signal/nds32: Use force_sig(SIGILL) in do_revisn Eric W. Biederman 2018-04-25 12:10 ` Vincent Chen 2018-04-25 16:13 ` [PATCH] signal/nds32: More information in do_revinsn Eric W. Biederman 2018-04-26 3:02 ` Vincent Chen 2018-04-20 1:03 ` [REVIEW][PATCH 06/17] signal: Ensure every siginfo we send has all bits initialized Eric W. Biederman 2018-04-20 1:03 ` [REVIEW][PATCH 07/17] signal: Reduce copy_siginfo_to_user to just copy_to_user Eric W. Biederman 2018-04-20 1:03 ` [REVIEW][PATCH 08/17] signal: Stop special casing TRAP_FIXME and FPE_FIXME in siginfo_layout Eric W. Biederman 2018-04-20 1:04 ` [REVIEW][PATCH 09/17] signal: Remove SEGV_BNDERR ifdefs Eric W. Biederman 2018-04-20 1:04 ` [REVIEW][PATCH 10/17] signal: Remove ifdefs for BUS_MCEERR_AR and BUS_MCEERR_AO Eric W. Biederman 2018-04-20 1:04 ` [REVIEW][PATCH 11/17] signal/alpha: Replace FPE_FIXME with FPE_FLTUNK Eric W. Biederman 2018-04-20 1:04 ` [REVIEW][PATCH 12/17] signal/ia64: " Eric W. Biederman 2018-04-20 1:04 ` Eric W. Biederman 2018-04-20 1:04 ` [REVIEW][PATCH 13/17] signal/powerpc: " Eric W. Biederman 2018-04-20 1:04 ` [REVIEW][PATCH 14/17] signal/unicore32: Use FPE_FLTUNK instead of 0 in ucf64_raise_sigfpe Eric W. Biederman 2018-04-20 1:04 ` [REVIEW][PATCH 15/17] signal: Add TRAP_UNK si_code for undiagnosted trap exceptions Eric W. Biederman 2018-04-20 1:04 ` [REVIEW][PATCH 16/17] signal/alpha: Replace TRAP_FIXME with TRAP_UNK Eric W. Biederman 2018-04-20 1:04 ` [REVIEW][PATCH 17/17] signal/powerpc: " Eric W. Biederman 2018-04-20 14:35 ` [REVIEW][PATCH 00/22] Simplifying siginfo users Eric W. Biederman 2018-04-20 14:35 ` Eric W. Biederman 2018-04-20 14:35 ` [OpenRISC] " Eric W. Biederman 2018-04-20 14:35 ` Eric W. Biederman 2018-04-20 14:35 ` Eric W. Biederman 2018-04-20 14:35 ` 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 ` [REVIEW][PATCH 03/22] signal/c6x: " Eric W. Biederman 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 ` [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 06/22] signal/microblaze: Remove the commented out force_sig_info in do_page_fault Eric W. Biederman 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 ` [REVIEW][PATCH 08/22] signal/mips: " Eric W. Biederman 2018-05-09 15:14 ` Matt Redfearn 2018-05-09 15:14 ` Matt Redfearn 2018-05-10 2:39 ` Eric W. Biederman 2018-05-10 2:39 ` Eric W. Biederman 2018-05-10 7:59 ` Matt Redfearn 2018-05-10 7:59 ` Matt Redfearn 2018-05-11 2:31 ` Eric W. Biederman 2018-05-11 2:31 ` Eric W. Biederman 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 2018-04-26 1:24 ` Greentime Hu 2018-04-20 14:37 ` [REVIEW][PATCH 10/22] signal/nios2: " Eric W. Biederman 2018-04-20 14:38 ` [REVIEW][PATCH 11/22] signal/openrisc: " Eric W. Biederman 2018-04-20 14:38 ` [OpenRISC] " Eric W. Biederman 2018-04-20 14:38 ` [REVIEW][PATCH 12/22] signal/parisc: Use force_sig_mceerr " Eric W. Biederman 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 2018-04-20 14:38 ` [REVIEW][PATCH 14/22] signal/riscv: " Eric W. Biederman 2018-04-20 14:38 ` Eric W. Biederman 2018-04-21 7:25 ` Christoph Hellwig 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 2018-04-24 15:31 ` Eric W. Biederman 2018-04-23 19:11 ` [REVIEW][PATCH 14/22] signal/riscv: Use force_sig_fault where appropriate Palmer Dabbelt 2018-04-23 19:11 ` Palmer Dabbelt 2018-04-23 19:11 ` Palmer Dabbelt 2018-04-24 15:28 ` Eric W. Biederman 2018-04-24 15:28 ` Eric W. Biederman 2018-04-20 14:38 ` [REVIEW][PATCH 15/22] signal/s390: " Eric W. Biederman 2018-04-23 5:44 ` Martin Schwidefsky 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 14:55 ` Rich Felker 2018-04-20 14:55 ` Rich Felker 2018-05-28 9:19 ` Geert Uytterhoeven 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 2018-05-29 15:00 ` Eric W. Biederman 2018-05-30 7:54 ` Sergei Shtylyov 2018-05-30 7:54 ` Sergei Shtylyov 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 18/22] signal/sparc: Use force_sig_fault " 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 2018-04-20 16:06 ` [uml-devel] " Anton Ivanov 2018-04-20 16:06 ` Anton Ivanov 2018-04-24 8:32 ` Richard Weinberger 2018-04-24 8:32 ` Richard Weinberger 2018-04-24 8:44 ` Anton Ivanov 2018-04-24 8:44 ` Anton Ivanov 2018-04-24 15:59 ` Eric W. Biederman 2018-04-24 15:59 ` Eric W. Biederman [not found] ` <CAMD8JhwgcWCp6c=O4-spNW1VdY5M-eAjr7M5PieeAfeTSe_4yw@mail.gmail.com> 2018-04-24 22:03 ` Martin Pärtel 2018-04-24 22:03 ` Martin Pärtel 2018-04-24 22:24 ` Eric W. Biederman 2018-04-24 22:24 ` Eric W. Biederman 2018-04-24 22:24 ` Eric W. Biederman 2018-04-25 23:05 ` Martin Pärtel 2018-04-28 14:02 ` [REVIEW][PATCH 0/5] Improving siginfo_layout and fixing uml's relay_signal Eric W. Biederman 2018-04-28 14:02 ` [uml-devel] " Eric W. Biederman 2018-04-28 14:06 ` [REVIEW][PATCH 1/5] signal/signalfd: Remove __put_user from signalfd_copyinfo Eric W. Biederman 2018-04-28 14:06 ` [REVIEW][PATCH 2/5] signal/signalfd: Add support for SIGSYS Eric W. Biederman 2018-04-28 14:07 ` [REVIEW][PATCH 3/5] signal: Remove unncessary #ifdef SEGV_PKUERR in 32bit compat code Eric W. Biederman 2018-04-28 14:07 ` [REVIEW][PATCH 4/5] signal: Extend siginfo_layout with SIL_FAULT_{MCEERR|BNDERR|PKUERR} Eric W. Biederman 2018-04-28 14:07 ` [REVIEW][PATCH 5/5] signal/um: More carefully relay signals in relay_signal Eric W. Biederman 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 ` [REVIEW][PATCH 21/22] signal/xtensa: Consistenly use SIGBUS in do_unaligned_user 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 2018-04-20 16:27 ` Max Filippov
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