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authorHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>2009-03-03 02:20:01 +0100
committerIngo Molnar <mingo@elte.hu>2009-03-03 09:03:12 +0100
commit2505170211f7630361a852e25b60f4df4c878daa (patch)
tree3a641f60e07b93a090805b268b21ac3fb3e42040 /arch/x86/kernel/signal.c
parentx86: signal: introduce helper align_sigframe() (diff)
downloadlinux-2505170211f7630361a852e25b60f4df4c878daa.tar.xz
linux-2505170211f7630361a852e25b60f4df4c878daa.zip
x86, signals: fix xine & firefox bustage
Impact: fix bad frame in rt_sigreturn on 64-bit After commit 97286a2b64725aac2d584ddd1f94871f9991d5a1 some applications fail to return from signal handler: [ 145.150133] firefox[3250] bad frame in rt_sigreturn frame:00007f902b44eb28 ip:352e80b307 sp:7f902b44ef70 orax:ffffffffffffffff in libpthread-2.9.so[352e800000+17000] [ 665.519017] firefox[5420] bad frame in rt_sigreturn frame:00007faa8deaeb28 ip:352e80b307 sp:7faa8deaef70 orax:ffffffffffffffff in libpthread-2.9.so[352e800000+17000] The root cause is forgetting to keep 64 byte aligned value of fpstate for next stack pointer calculation. Reported-by: Jaswinder Singh Rajput <jaswinder@kernel.org> Reported-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> LKML-Reference: <49AC85C1.7060600@ct.jp.nec.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/signal.c')
-rw-r--r--arch/x86/kernel/signal.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index dde3f2ae2371..d2cc6428c587 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -240,11 +240,10 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
if (used_math()) {
sp -= sig_xstate_size;
-#ifdef CONFIG_X86_32
- *fpstate = (void __user *) sp;
-#else /* !CONFIG_X86_32 */
- *fpstate = (void __user *)round_down(sp, 64);
-#endif /* CONFIG_X86_32 */
+#ifdef CONFIG_X86_64
+ sp = round_down(sp, 64);
+#endif /* CONFIG_X86_64 */
+ *fpstate = (void __user *)sp;
if (save_i387_xstate(*fpstate) < 0)
return (void __user *)-1L;