[PATCH] x86: Don't require the vDSO for handling a.out signals

and in other strange binfmts. vDSO is not necessarily mapped there.

Signed-off-by: Andi Kleen <ak@suse.de>

2 files changed, 11 insertions, 2 deletions

diff --git a/arch/i386/kernel/signal.c b/arch/i386/kernel/signal.c
index 8f4afcc7d2ab..4f99e870c986 100644
--- a/arch/i386/kernel/signal.c
+++ b/arch/i386/kernel/signal.c
@@ -21,6 +21,7 @@
 #include <linux/suspend.h>
 #include <linux/ptrace.h>
 #include <linux/elf.h>
+#include <linux/binfmts.h>
 #include <asm/processor.h>
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
@@ -349,7 +350,10 @@ static int setup_frame(int sig, struct k_sigaction *ka,
                         goto give_sigsegv;
         }
 
-        restorer = (void *)VDSO_SYM(&__kernel_sigreturn);
+        if (current->binfmt->hasvdso)
+                restorer = (void *)VDSO_SYM(&__kernel_sigreturn);
+        else
+                restorer = (void *)&frame->retcode;
         if (ka->sa.sa_flags & SA_RESTORER)
                 restorer = ka->sa.sa_restorer;
 
diff --git a/arch/x86_64/ia32/ia32_signal.c b/arch/x86_64/ia32/ia32_signal.c
index 490f7c1b7c84..359eacc38509 100644
--- a/arch/x86_64/ia32/ia32_signal.c
+++ b/arch/x86_64/ia32/ia32_signal.c
@@ -21,6 +21,7 @@
 #include <linux/stddef.h>
 #include <linux/personality.h>
 #include <linux/compat.h>
+#include <linux/binfmts.h>
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
 #include <asm/i387.h>
@@ -449,7 +450,11 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
 
         /* Return stub is in 32bit vsyscall page */
         { 
-                void __user *restorer = VSYSCALL32_SIGRETURN; 
+                void __user *restorer;
+                if (current->binfmt->hasvdso)
+                        restorer = VSYSCALL32_SIGRETURN;
+                else
+                        restorer = (void *)&frame->retcode;
                 if (ka->sa.sa_flags & SA_RESTORER)
                         restorer = ka->sa.sa_restorer;       
                 err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);