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authorHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>2009-03-02 20:20:01 -0500
committerIngo Molnar <mingo@elte.hu>2009-03-03 03:03:12 -0500
commit2505170211f7630361a852e25b60f4df4c878daa (patch)
tree3a641f60e07b93a090805b268b21ac3fb3e42040 /arch/x86/kernel
parent1fae0279ce4811fa123001515d1ed3d68c1d557f (diff)
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')
-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,
240 240
241 if (used_math()) { 241 if (used_math()) {
242 sp -= sig_xstate_size; 242 sp -= sig_xstate_size;
243#ifdef CONFIG_X86_32 243#ifdef CONFIG_X86_64
244 *fpstate = (void __user *) sp; 244 sp = round_down(sp, 64);
245#else /* !CONFIG_X86_32 */ 245#endif /* CONFIG_X86_64 */
246 *fpstate = (void __user *)round_down(sp, 64); 246 *fpstate = (void __user *)sp;
247#endif /* CONFIG_X86_32 */
248 247
249 if (save_i387_xstate(*fpstate) < 0) 248 if (save_i387_xstate(*fpstate) < 0)
250 return (void __user *)-1L; 249 return (void __user *)-1L;