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>

diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c
index 5379969..fd05170 100644 (file)
--- 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. */