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| author | John David Anglin <dave.anglin@bell.net> | 2012-11-25 21:39:00 +0000 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2013-01-07 23:06:27 +0100 |
| commit | ad30f3ff3deb4037f2beea15812d01d795f8b3cc (patch) | |
| tree | 20dbd553fb9244141d242303acd4679a9c67d1b4 /arch/parisc | |
| parent | 34360f080cb5848990576e1465d2d01a3c261762 (diff) | |
| download | linux-ad30f3ff3deb4037f2beea15812d01d795f8b3cc.tar.gz linux-ad30f3ff3deb4037f2beea15812d01d795f8b3cc.tar.bz2 linux-ad30f3ff3deb4037f2beea15812d01d795f8b3cc.zip | |
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/parisc')
| -rw-r--r-- | arch/parisc/kernel/signal.c | 4 |
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. */ |