Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

Pull first series of signal handling cleanups from Al Viro:
 "This is just the first part of the queue (about a half of it);
  assorted fixes all over the place in signal handling.

  This one ends with all sigsuspend() implementations switched to
  generic one (->saved_sigmask-based).

  With this, a bunch of assorted old buglets are fixed and most of the
  missing bits of NOTIFY_RESUME hookup are in place.  Two more fixes sit
  in arm and um trees respectively, and there's a couple of broken ones
  that need obvious fixes - parisc and avr32 check TIF_NOTIFY_RESUME
  only on one of two codepaths; fixes for that will happen in the next
  series"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (55 commits)
  unicore32: if there's no handler we need to restore sigmask, syscall or no syscall
  xtensa: add handling of TIF_NOTIFY_RESUME
  microblaze: drop 'oldset' argument of do_notify_resume()
  microblaze: handle TIF_NOTIFY_RESUME
  score: add handling of NOTIFY_RESUME to do_notify_resume()
  m68k: add TIF_NOTIFY_RESUME and handle it.
  sparc: kill ancient comment in sparc_sigaction()
  h8300: missing checks of __get_user()/__put_user() return values
  frv: missing checks of __get_user()/__put_user() return values
  cris: missing checks of __get_user()/__put_user() return values
  powerpc: missing checks of __get_user()/__put_user() return values
  sh: missing checks of __get_user()/__put_user() return values
  sparc: missing checks of __get_user()/__put_user() return values
  avr32: struct old_sigaction is never used
  m32r: struct old_sigaction is never used
  xtensa: xtensa_sigaction doesn't exist
  alpha: tidy signal delivery up
  score: don't open-code force_sigsegv()
  cris: don't open-code force_sigsegv()
  blackfin: don't open-code force_sigsegv()
  ...

1 files changed, 27 insertions, 53 deletions

diff --git a/arch/alpha/kernel/signal.c b/arch/alpha/kernel/signal.c
index 35f2ef44de12..10ab2d74ecbb 100644
--- a/arch/alpha/kernel/signal.c
+++ b/arch/alpha/kernel/signal.c
@@ -34,9 +34,6 @@
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
 asmlinkage void ret_from_sys_call(void);
-static void do_signal(struct pt_regs *, struct switch_stack *,
-                      unsigned long, unsigned long);
-
 
 /*
  * The OSF/1 sigprocmask calling sequence is different from the
@@ -121,17 +118,8 @@ SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
 SYSCALL_DEFINE1(sigsuspend, old_sigset_t, mask)
 {
         sigset_t blocked;
-
-        current->saved_sigmask = current->blocked;
-
-        mask &= _BLOCKABLE;
         siginitset(&blocked, mask);
-        set_current_blocked(&blocked);
-
-        current->state = TASK_INTERRUPTIBLE;
-        schedule();
-        set_thread_flag(TIF_RESTORE_SIGMASK);
-        return -ERESTARTNOHAND;
+        return sigsuspend(&blocked);
 }
 
 asmlinkage int
@@ -376,11 +364,11 @@ setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
         oldsp = rdusp();
         frame = get_sigframe(ka, oldsp, sizeof(*frame));
         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-                goto give_sigsegv;
+                return -EFAULT;
 
         err |= setup_sigcontext(&frame->sc, regs, sw, set->sig[0], oldsp);
         if (err)
-                goto give_sigsegv;
+                return -EFAULT;
 
         /* Set up to return from userspace.  If provided, use a stub
            already in userspace.  */
@@ -396,7 +384,7 @@ setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
 
         /* Check that everything was written properly.  */
         if (err)
-                goto give_sigsegv;
+                return err;
 
         /* "Return" to the handler */
         regs->r26 = r26;
@@ -410,12 +398,7 @@ setup_frame(int sig, struct k_sigaction *ka, sigset_t *set,
         printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
                 current->comm, current->pid, frame, regs->pc, regs->r26);
 #endif
-
         return 0;
-
-give_sigsegv:
-        force_sigsegv(sig, current);
-        return -EFAULT;
 }
 
 static int
@@ -428,7 +411,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
         oldsp = rdusp();
         frame = get_sigframe(ka, oldsp, sizeof(*frame));
         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-                goto give_sigsegv;
+                return -EFAULT;
 
         err |= copy_siginfo_to_user(&frame->info, info);
 
@@ -443,7 +426,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                                 set->sig[0], oldsp);
         err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
         if (err)
-                goto give_sigsegv;
+                return -EFAULT;
 
         /* Set up to return from userspace.  If provided, use a stub
            already in userspace.  */
@@ -459,7 +442,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
         }
 
         if (err)
-                goto give_sigsegv;
+                return -EFAULT;
 
         /* "Return" to the handler */
         regs->r26 = r26;
@@ -475,31 +458,37 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 #endif
 
         return 0;
-
-give_sigsegv:
-        force_sigsegv(sig, current);
-        return -EFAULT;
 }
 
 
 /*
  * OK, we're invoking a handler.
  */
-static inline int
+static inline void
 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
-              sigset_t *oldset, struct pt_regs * regs, struct switch_stack *sw)
+              struct pt_regs * regs, struct switch_stack *sw)
 {
+        sigset_t *oldset = &current->blocked;
         int ret;
 
+        if (test_thread_flag(TIF_RESTORE_SIGMASK))
+                oldset = &current->saved_sigmask;
+
         if (ka->sa.sa_flags & SA_SIGINFO)
                 ret = setup_rt_frame(sig, ka, info, oldset, regs, sw);
         else
                 ret = setup_frame(sig, ka, oldset, regs, sw);
 
-        if (ret == 0)
-                block_sigmask(ka, sig);
-
-        return ret;
+        if (ret) {
+                force_sigsegv(sig, current);
+                return;
+        }
+        block_sigmask(ka, sig);
+        /* A signal was successfully delivered, and the
+           saved sigmask was stored on the signal frame,
+           and will be restored by sigreturn.  So we can
+           simply clear the restore sigmask flag.  */
+        clear_thread_flag(TIF_RESTORE_SIGMASK);
 }
 
 static inline void
@@ -547,12 +536,6 @@ do_signal(struct pt_regs * regs, struct switch_stack * sw,
         int signr;
         unsigned long single_stepping = ptrace_cancel_bpt(current);
         struct k_sigaction ka;
-        sigset_t *oldset;
-
-        if (test_thread_flag(TIF_RESTORE_SIGMASK))
-                oldset = &current->saved_sigmask;
-        else
-                oldset = &current->blocked;
 
         /* This lets the debugger run, ... */
         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
@@ -564,14 +547,7 @@ do_signal(struct pt_regs * regs, struct switch_stack * sw,
                 /* Whee!  Actually deliver the signal.  */
                 if (r0)
                         syscall_restart(r0, r19, regs, &ka);
-                if (handle_signal(signr, &ka, &info, oldset, regs, sw) == 0) {
-                        /* A signal was successfully delivered, and the
-                           saved sigmask was stored on the signal frame,
-                           and will be restored by sigreturn.  So we can
-                           simply clear the restore sigmask flag.  */
-                        if (test_thread_flag(TIF_RESTORE_SIGMASK))
-                                clear_thread_flag(TIF_RESTORE_SIGMASK);
-                }
+                handle_signal(signr, &ka, &info, regs, sw);
                 if (single_stepping) 
                         ptrace_set_bpt(current); /* re-set bpt */
                 return;
@@ -596,10 +572,8 @@ do_signal(struct pt_regs * regs, struct switch_stack * sw,
         }
 
         /* If there's no signal to deliver, we just restore the saved mask.  */
-        if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
-                clear_thread_flag(TIF_RESTORE_SIGMASK);
-                sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
-        }
+        if (test_and_clear_thread_flag(TIF_RESTORE_SIGMASK))
+                set_current_blocked(&current->saved_sigmask);
 
         if (single_stepping)
                 ptrace_set_bpt(current);        /* re-set breakpoint */
@@ -610,7 +584,7 @@ do_notify_resume(struct pt_regs *regs, struct switch_stack *sw,
                  unsigned long thread_info_flags,
                  unsigned long r0, unsigned long r19)
 {
-        if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
+        if (thread_info_flags & _TIF_SIGPENDING)
                 do_signal(regs, sw, r0, r19);
 
         if (thread_info_flags & _TIF_NOTIFY_RESUME) {