X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=arch%2Fpowerpc%2Fkernel%2Fsignal_64.c;h=c2db642f4cdd44c32695432b9622406204fdd866;hb=63518472c05a351d779f35803e6ccfb361ae630a;hp=47f910380a6a5960d267ce9f3f3041a283871e3c;hpb=516450179454de9e689e0a53ed8f34b896e8651c;p=powerpc.git

diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 47f910380a..c2db642f4c 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -33,6 +33,7 @@
 #include <asm/pgtable.h>
 #include <asm/unistd.h>
 #include <asm/cacheflush.h>
+#include <asm/syscalls.h>
 #include <asm/vdso.h>
 
 #define DEBUG_SIG 0
@@ -181,6 +182,8 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
 	err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
 	if (err)
 		return err;
+	if (v_regs && !access_ok(VERIFY_READ, v_regs, 34 * sizeof(vector128)))
+		return -EFAULT;
 	/* Copy 33 vec registers (vr0..31 and vscr) from the stack */
 	if (v_regs != 0 && (msr & MSR_VEC) != 0)
 		err |= __copy_from_user(current->thread.vr, v_regs,
@@ -211,7 +214,7 @@ static inline void __user * get_sigframe(struct k_sigaction *ka, struct pt_regs
         /* Default to using normal stack */
         newsp = regs->gpr[1];
 
-	if (ka->sa.sa_flags & SA_ONSTACK) {
+	if ((ka->sa.sa_flags & SA_ONSTACK) && current->sas_ss_size) {
 		if (! on_sig_stack(regs->gpr[1]))
 			newsp = (current->sas_ss_sp + current->sas_ss_size);
 	}