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()
  ...

4 files changed, 14 insertions, 38 deletions

diff --git a/arch/sparc/kernel/signal32.c b/arch/sparc/kernel/signal32.c
index 948700fb9036..bb1513e45f1a 100644
--- a/arch/sparc/kernel/signal32.c
+++ b/arch/sparc/kernel/signal32.c
@@ -215,8 +215,9 @@ void do_sigreturn32(struct pt_regs *regs)
             (((unsigned long) sf) & 3))
                 goto segv;
 
-        get_user(pc, &sf->info.si_regs.pc);
-        __get_user(npc, &sf->info.si_regs.npc);
+        if (get_user(pc, &sf->info.si_regs.pc) ||
+            __get_user(npc, &sf->info.si_regs.npc))
+                goto segv;
 
         if ((pc | npc) & 3)
                 goto segv;
@@ -305,8 +306,9 @@ asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
             (((unsigned long) sf) & 3))
                 goto segv;
 
-        get_user(pc, &sf->regs.pc);
-        __get_user(npc, &sf->regs.npc);
+        if (get_user(pc, &sf->regs.pc) || 
+            __get_user(npc, &sf->regs.npc))
+                goto segv;
 
         if ((pc | npc) & 3)
                 goto segv;
diff --git a/arch/sparc/kernel/signal_32.c b/arch/sparc/kernel/signal_32.c
index ac8e66b50f07..2b7e849f7c65 100644
--- a/arch/sparc/kernel/signal_32.c
+++ b/arch/sparc/kernel/signal_32.c
@@ -64,18 +64,8 @@ struct rt_signal_frame {
 static int _sigpause_common(old_sigset_t set)
 {
         sigset_t blocked;
-
-        current->saved_sigmask = current->blocked;
-
-        set &= _BLOCKABLE;
         siginitset(&blocked, set);
-        set_current_blocked(&blocked);
-
-        current->state = TASK_INTERRUPTIBLE;
-        schedule();
-        set_thread_flag(TIF_RESTORE_SIGMASK);
-
-        return -ERESTARTNOHAND;
+        return sigsuspend(&blocked);
 }
 
 asmlinkage int sys_sigsuspend(old_sigset_t set)
diff --git a/arch/sparc/kernel/signal_64.c b/arch/sparc/kernel/signal_64.c
index 48b0f57b65f7..eafaab486b2d 100644
--- a/arch/sparc/kernel/signal_64.c
+++ b/arch/sparc/kernel/signal_64.c
@@ -242,19 +242,8 @@ struct rt_signal_frame {
 static long _sigpause_common(old_sigset_t set)
 {
         sigset_t blocked;
-
-        current->saved_sigmask = current->blocked;
-
-        set &= _BLOCKABLE;
         siginitset(&blocked, set);
-        set_current_blocked(&blocked);
-
-        current->state = TASK_INTERRUPTIBLE;
-        schedule();
-
-        set_restore_sigmask();
-
-        return -ERESTARTNOHAND;
+        return sigsuspend(&blocked);
 }
 
 asmlinkage long sys_sigpause(unsigned int set)
diff --git a/arch/sparc/kernel/sys_sparc_32.c b/arch/sparc/kernel/sys_sparc_32.c
index 627e89af1d71..0c9b31b22e07 100644
--- a/arch/sparc/kernel/sys_sparc_32.c
+++ b/arch/sparc/kernel/sys_sparc_32.c
@@ -184,10 +184,10 @@ sparc_sigaction (int sig, const struct old_sigaction __user *act,
 
                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
-                    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
+                    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
+                    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
+                    __get_user(mask, &act->sa_mask))
                         return -EFAULT;
-                __get_user(new_ka.sa.sa_flags, &act->sa_flags);
-                __get_user(mask, &act->sa_mask);
                 siginitset(&new_ka.sa.sa_mask, mask);
                 new_ka.ka_restorer = NULL;
         }
@@ -195,17 +195,12 @@ sparc_sigaction (int sig, const struct old_sigaction __user *act,
         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 
         if (!ret && oact) {
-                /* In the clone() case we could copy half consistent
-                 * state to the user, however this could sleep and
-                 * deadlock us if we held the signal lock on SMP.  So for
-                 * now I take the easy way out and do no locking.
-                 */
                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
-                    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
+                    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
+                    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
+                    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
                         return -EFAULT;
-                __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
-                __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
         }
 
         return ret;