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authorLinus Torvalds <torvalds@linux-foundation.org>2015-01-29 11:15:17 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-04-29 10:31:55 +0200
commit910584ae1ffcac7067429a90360dd2168d7d3fcf (patch)
tree1e5192fdb470c8593923b06162f681a82f8fc658
parent1c2af9193ede7cd223d65c53e72113a24e64ae75 (diff)
downloadlwn-910584ae1ffcac7067429a90360dd2168d7d3fcf.tar.gz
lwn-910584ae1ffcac7067429a90360dd2168d7d3fcf.zip
vm: make stack guard page errors return VM_FAULT_SIGSEGV rather than SIGBUS
commit 9c145c56d0c8a0b62e48c8d71e055ad0fb2012ba upstream. The stack guard page error case has long incorrectly caused a SIGBUS rather than a SIGSEGV, but nobody actually noticed until commit fee7e49d4514 ("mm: propagate error from stack expansion even for guard page") because that error case was never actually triggered in any normal situations. Now that we actually report the error, people noticed the wrong signal that resulted. So far, only the test suite of libsigsegv seems to have actually cared, but there are real applications that use libsigsegv, so let's not wait for any of those to break. Reported-and-tested-by: Takashi Iwai <tiwai@suse.de> Tested-by: Jan Engelhardt <jengelh@inai.de> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # "s390 still compiles and boots" Cc: linux-arch@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--mm/memory.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 120eb53f8157..749e1c68d490 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3236,7 +3236,7 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
/* Check if we need to add a guard page to the stack */
if (check_stack_guard_page(vma, address) < 0)
- return VM_FAULT_SIGBUS;
+ return VM_FAULT_SIGSEGV;
/* Use the zero-page for reads */
if (!(flags & FAULT_FLAG_WRITE)) {