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authorJohn David Anglin <dave.anglin@bell.net>2012-11-25 21:39:00 +0000
committerHelge Deller <deller@gmx.de>2013-01-07 23:06:27 +0100
commitad30f3ff3deb4037f2beea15812d01d795f8b3cc (patch)
tree20dbd553fb9244141d242303acd4679a9c67d1b4 /arch
parent34360f080cb5848990576e1465d2d01a3c261762 (diff)
downloadlinux-ad30f3ff3deb4037f2beea15812d01d795f8b3cc.tar.bz2
parisc: sigaltstack doesn't round ss.ss_sp as required
On 24-Nov-12, at 10:05 AM, John David Anglin wrote: > In trying to build the debian libsigsegv2 package, I found that sigaltstack > doesn't round ss.ss_sp. The tests intentionally pass an unaligned pointer. > This results in the two stack overflow tests failing. The attached patch fixes this issue. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/parisc/kernel/signal.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index 537996955998..fd051705a407 100644
--- a/arch/parisc/kernel/signal.c
+++ b/arch/parisc/kernel/signal.c
@@ -190,8 +190,10 @@ get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
DBG(1,"get_sigframe: ka = %#lx, sp = %#lx, frame_size = %#lx\n",
(unsigned long)ka, sp, frame_size);
+ /* Align alternate stack and reserve 64 bytes for the signal
+ handler's frame marker. */
if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp))
- sp = current->sas_ss_sp; /* Stacks grow up! */
+ sp = (current->sas_ss_sp + 0x7f) & ~0x3f; /* Stacks grow up! */
DBG(1,"get_sigframe: Returning sp = %#lx\n", (unsigned long)sp);
return (void __user *) sp; /* Stacks grow up. Fun. */