signals/sigaltstack, x86/signals: Unify the x86 sigaltstack check with other architec...

[deliverable/linux.git] / arch / x86 / kernel / signal.c

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 548ddf7d6fd2085676328ffcde6375ce3e88b477..3e84ef16f65799459cd55e0c1bce50ae43a9195e 100644 (file)
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -248,18 +248,17 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
        if (config_enabled(CONFIG_X86_64))
                sp -= 128;
 
-       if (!onsigstack) {
-               /* This is the X/Open sanctioned signal stack switching.  */
-               if (ka->sa.sa_flags & SA_ONSTACK) {
-                       if (current->sas_ss_size)
-                               sp = current->sas_ss_sp + current->sas_ss_size;
-               } else if (config_enabled(CONFIG_X86_32) &&
-                          (regs->ss & 0xffff) != __USER_DS &&
-                          !(ka->sa.sa_flags & SA_RESTORER) &&
-                          ka->sa.sa_restorer) {
-                               /* This is the legacy signal stack switching. */
-                               sp = (unsigned long) ka->sa.sa_restorer;
-               }
+       /* This is the X/Open sanctioned signal stack switching.  */
+       if (ka->sa.sa_flags & SA_ONSTACK) {
+               if (sas_ss_flags(sp) == 0)
+                       sp = current->sas_ss_sp + current->sas_ss_size;
+       } else if (config_enabled(CONFIG_X86_32) &&
+                  !onsigstack &&
+                  (regs->ss & 0xffff) != __USER_DS &&
+                  !(ka->sa.sa_flags & SA_RESTORER) &&
+                  ka->sa.sa_restorer) {
+               /* This is the legacy signal stack switching. */
+               sp = (unsigned long) ka->sa.sa_restorer;
        }
 
        if (fpu->fpstate_active) {