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arm64: signal: Call arm64_notify_segfault when failing to deliver signal

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If we fail to deliver a signal due to taking an unhandled fault on the
stackframe, we can call arm64_notify_segfault to deliver a SEGV can deal
with printing any unhandled signal messages for us, rather than roll our
own printing code.

A side-effect of this change is that we now deliver the frame address
in si_addr along with an si_code of SEGV_{ACC,MAP}ERR, rather than an
si_addr of 0 and an si_code of SI_KERNEL as before.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2018-02-20 15:05:17 +00:00
parent 92ff0674f5
commit f71016a8a8
2 changed files with 5 additions and 15 deletions
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7
arch/arm64/kernel/signal.c
View File

@ -40,6 +40,7 @@
#include <asm/fpsimd.h>
#include <asm/ptrace.h>
#include <asm/signal32.h>
#include <asm/traps.h>
#include <asm/vdso.h>
/*
@ -565,11 +566,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
return regs->regs[0];
badframe:
if (show_unhandled_signals)
pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
current->comm, task_pid_nr(current), __func__,
regs->pc, regs->sp);
force_sig(SIGSEGV, current);
arm64_notify_segfault(regs->sp);
return 0;
}

13
arch/arm64/kernel/signal32.c
View File

@ -26,6 +26,7 @@
#include <asm/esr.h>
#include <asm/fpsimd.h>
#include <asm/signal32.h>
#include <asm/traps.h>
#include <linux/uaccess.h>
#include <asm/unistd.h>
@ -307,11 +308,7 @@ asmlinkage int compat_sys_sigreturn(struct pt_regs *regs)
return regs->regs[0];
badframe:
if (show_unhandled_signals)
pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
current->comm, task_pid_nr(current), __func__,
regs->pc, regs->compat_sp);
force_sig(SIGSEGV, current);
arm64_notify_segfault(regs->compat_sp);
return 0;
}
@ -344,11 +341,7 @@ asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
return regs->regs[0];
badframe:
if (show_unhandled_signals)
pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n",
current->comm, task_pid_nr(current), __func__,
regs->pc, regs->compat_sp);
force_sig(SIGSEGV, current);
arm64_notify_segfault(regs->compat_sp);
return 0;
}