This is a note to let you know that I've just added the patch titled
arm64: don't kill the kernel on a bad esr from el0
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-don-t-kill-the-kernel-on-a-bad-esr-from-el0.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9955ac47f4ba1c95ecb6092aeaefb40a22e99268 Mon Sep 17 00:00:00 2001
From: Mark Rutland <mark.rutland@xxxxxxx>
Date: Tue, 28 May 2013 15:54:15 +0100
Subject: arm64: don't kill the kernel on a bad esr from el0
From: Mark Rutland <mark.rutland@xxxxxxx>
commit 9955ac47f4ba1c95ecb6092aeaefb40a22e99268 upstream.
Rather than completely killing the kernel if we receive an esr value we
can't deal with in the el0 handlers, send the process a SIGILL and log
the esr value in the hope that we can debug it. If we receive a bad esr
from el1, we'll die() as before.
Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/traps.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -317,14 +317,20 @@ asmlinkage long do_ni_syscall(struct pt_
*/
asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
{
+ siginfo_t info;
+ void __user *pc = (void __user *)instruction_pointer(regs);
console_verbose();
pr_crit("Bad mode in %s handler detected, code 0x%08x\n",
handler[reason], esr);
+ __show_regs(regs);
- die("Oops - bad mode", regs, 0);
- local_irq_disable();
- panic("bad mode");
+ info.si_signo = SIGILL;
+ info.si_errno = 0;
+ info.si_code = ILL_ILLOPC;
+ info.si_addr = pc;
+
+ arm64_notify_die("Oops - bad mode", regs, &info, 0);
}
void __pte_error(const char *file, int line, unsigned long val)
Patches currently in stable-queue which might be from mark.rutland@xxxxxxx are
queue-3.9/arm64-don-t-kill-the-kernel-on-a-bad-esr-from-el0.patch
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