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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>
This commit is contained in:
Helge Deller 2017-07-02 22:00:41 +02:00
parent b0f94efd5a
commit 247462316f
1 changed files with 1 additions and 1 deletions
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2
arch/parisc/mm/fault.c
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@ -359,7 +359,7 @@ bad_area:
case 15: /* Data TLB miss fault/Data page fault */ case 15: /* Data TLB miss fault/Data page fault */
/* send SIGSEGV when outside of vma */ /* send SIGSEGV when outside of vma */
if (!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_signo = SIGSEGV;
si.si_code = SEGV_MAPERR; si.si_code = SEGV_MAPERR;
break; break;