From: Helge Deller <deller@gmx.de>
Date: Sun, 2 Jul 2017 20:00:41 +0000 (+0200)
Subject: parisc: Report SIGSEGV instead of SIGBUS when running out of stack
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=247462316f85a9e0479445c1a4223950b68ffac1;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

parisc: Report SIGSEGV instead of SIGBUS when running out of stack

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.

Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>
---

diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c
index 41448f7b2b2a..5b101f6a5607 100644
--- a/arch/parisc/mm/fault.c
+++ b/arch/parisc/mm/fault.c
@@ -359,7 +359,7 @@ 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;