Commit cd01854e authored by Helge Deller's avatar Helge Deller Committed by Greg Kroah-Hartman

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

commit 24746231 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: default avatarHelge Deller <deller@gmx.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 655dff16
...@@ -303,7 +303,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long code, ...@@ -303,7 +303,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
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;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment