Masoud Asgharifard Sharbiani wrote:
Hello,
This patch makes the i386 behave the same way that x86_64 does when a
segfault happens. A line gets printed to the kernel log so that tools
that need to check for failures can behave more uniformly between
different kernels. Like x86_64, it can be disabled by setting
debug.exception-trace sysctl variable to 0 (or by doing
echo 0 > /proc/sys/debug/exception-trace)
Same behaviour can be extended to other architectures, if needed.
cheers,
Masoud.
Signed-off-by: Masoud Sharbiani <[email protected]>
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c
index 29d7d61..6aa56db 100644
--- a/arch/i386/mm/fault.c
+++ b/arch/i386/mm/fault.c
@@ -283,6 +283,8 @@ static inline int vmalloc_fault(unsigned long address)
return 0;
}
+int exception_trace = 1;
+
/*
* This routine handles page faults. It determines the address,
* and the problem, and then passes it off to one of the appropriate
@@ -464,7 +466,14 @@ bad_area_nosemaphore:
*/
if (is_prefetch(regs, address, error_code))
return;
-
+ if (exception_trace && unhandled_signal(tsk, SIGSEGV)) {
+ printk(
+ "%s%s[%d]: segfault at %08lx eip %08lx esp %08lx error %lx\n",
+ tsk->pid > 1 ? KERN_INFO : KERN_EMERG,
+ tsk->comm, tsk->pid, address, regs->eip,
+ regs->esp, error_code);
Shouldn't we use printk_ratelimit() here, to prevent some nasty person
from creating some rapidly-segfaulting process that floods the kernel
logs? (Same with the x86_64 version if it doesn't already..)
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from [email protected]
Home Page: http://www.roberthancock.com/
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
