Patch "parisc: Report SIGSEGV instead of SIGBUS when running out of stack" has been added to the 4.9-stable tree

Patch "parisc: Report SIGSEGV instead of SIGBUS when running out of stack" has been added to the 4.9-stable tree

[gregkh]

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 4.9-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:
     parisc-report-sigsegv-instead-of-sigbus-when-running-out-of-stack.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 247462316f85a9e0479445c1a4223950b68ffac1 Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@gmx.de>
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@gmx.de>

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@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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
@@ -366,7 +366,7 @@ 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@gmx.de are

queue-4.9/parisc-use-compat_sys_keyctl.patch
queue-4.9/mm-fix-overflow-check-in-expand_upwards.patch
queue-4.9/parisc-dma-api-return-error-instead-of-bug_on-for-dma-ops-on-non-dma-devs.patch
queue-4.9/parisc-mm-ensure-irqs-are-off-in-switch_mm.patch
queue-4.9/parisc-report-sigsegv-instead-of-sigbus-when-running-out-of-stack.patch