This is a note to let you know that I've just added the patch titled
parisc: Report SIGSEGV instead of SIGBUS when running out of stack
to the 4.12-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:
parisc-report-sigsegv-instead-of-sigbus-when-running-out-of-stack.patch
and it can be found in the queue-4.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 247462316f85a9e0479445c1a4223950b68ffac1 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@xxxxxx>
Date: Sun, 2 Jul 2017 22:00:41 +0200
Subject: parisc: Report SIGSEGV instead of SIGBUS when running out of stack
From: Helge Deller <deller@xxxxxx>
commit 247462316f85a9e0479445c1a4223950b68ffac1 upstream.
When a process runs out of stack the parisc kernel wrongly faults with SIGBUS
instead of the expected SIGSEGV signal.
This example shows how the kernel faults:
do_page_fault() command='a.out' type=15 address=0xfaac2000 in libc-2.24.so[f8308000+16c000]
trap #15: Data TLB miss fault, vm_start = 0xfa2c2000, vm_end = 0xfaac2000
The vma->vm_end value is the first address which does not belong to the vma, so
adjust the check to include vma->vm_end to the range for which to send the
SIGSEGV signal.
This patch unbreaks building the debian libsigsegv package.
Signed-off-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/mm/fault.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/parisc/mm/fault.c
+++ b/arch/parisc/mm/fault.c
@@ -367,7 +367,7 @@ bad_area:
case 15: /* Data TLB miss fault/Data page fault */
/* send SIGSEGV when outside of vma */
if (!vma ||
- address < vma->vm_start || address > vma->vm_end) {
+ address < vma->vm_start || address >= vma->vm_end) {
si.si_signo = SIGSEGV;
si.si_code = SEGV_MAPERR;
break;
Patches currently in stable-queue which might be from deller@xxxxxx are
queue-4.12/parisc-use-compat_sys_keyctl.patch
queue-4.12/parisc-dma-api-return-error-instead-of-bug_on-for-dma-ops-on-non-dma-devs.patch
queue-4.12/parisc-mm-ensure-irqs-are-off-in-switch_mm.patch
queue-4.12/parisc-report-sigsegv-instead-of-sigbus-when-running-out-of-stack.patch