1 files changed, 18 insertions, 5 deletions

diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 1decf2785530..5462bef898f6 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -96,8 +96,10 @@ long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, int p3, int
         while (1) {
                 current->state = TASK_INTERRUPTIBLE;
                 schedule();
-                if (do_signal(&saveset, regs))
+                if (do_signal(&saveset, regs)) {
+                        set_thread_flag(TIF_RESTOREALL);
                         return 0;
+                }
         }
 }
 
@@ -152,6 +154,14 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
         err |= __put_user(0, &sc->v_regs);
 #endif /* CONFIG_ALTIVEC */
         err |= __put_user(&sc->gp_regs, &sc->regs);
+        if (!FULL_REGS(regs)) {
+                /* Zero out the unsaved GPRs to avoid information
+                   leak, and set TIF_SAVE_NVGPRS to ensure that the
+                   registers do actually get saved later. */
+                memset(&regs->gpr[14], 0, 18 * sizeof(unsigned long));
+                set_thread_flag(TIF_SAVE_NVGPRS);
+                current_thread_info()->nvgprs_frame = &sc->gp_regs;
+        }
         err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
         err |= __copy_to_user(&sc->fp_regs, &current->thread.fpr, FP_REGS_SIZE);
         err |= __put_user(signr, &sc->signal);
@@ -340,6 +350,7 @@ int sys_swapcontext(struct ucontext __user *old_ctx,
                 do_exit(SIGSEGV);
 
         /* This returns like rt_sigreturn */
+        set_thread_flag(TIF_RESTOREALL);
         return 0;
 }
 
@@ -372,7 +383,8 @@ int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
          */
         do_sigaltstack(&uc->uc_stack, NULL, regs->gpr[1]);
 
-        return regs->result;
+        set_thread_flag(TIF_RESTOREALL);
+        return 0;
 
 badframe:
 #if DEBUG_SIG
@@ -454,9 +466,6 @@ static int setup_rt_frame(int signr, struct k_sigaction *ka, siginfo_t *info,
         if (err)
                 goto badframe;
 
-        if (test_thread_flag(TIF_SINGLESTEP))
-                ptrace_notify(SIGTRAP);
-
         return 1;
 
 badframe:
@@ -502,6 +511,8 @@ static inline void syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
                  * we only get here if there is a handler, we dont restart.
                  */
                 regs->result = -EINTR;
+                regs->gpr[3] = EINTR;
+                regs->ccr |= 0x10000000;
                 break;
         case -ERESTARTSYS:
                 /* ERESTARTSYS means to restart the syscall if there is no
@@ -509,6 +520,8 @@ static inline void syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
                  */
                 if (!(ka->sa.sa_flags & SA_RESTART)) {
                         regs->result = -EINTR;
+                        regs->gpr[3] = EINTR;
+                        regs->ccr |= 0x10000000;
                         break;
                 }
                 /* fallthrough */