sh: use set_current_blocked() and block_sigmask()

As described in e6fa16ab ("signal: sigprocmask() should do
retarget_shared_pending()") the modification of current->blocked is
incorrect as we need to check whether the signal we're about to block is
pending in the shared queue.

Also, use the new helper function introduced in commit 5e6292c0f28f
("signal: add block_sigmask() for adding sigmask to current->blocked")
which centralises the code for updating current->blocked after
successfully delivering a signal and reduces the amount of duplicate code
across architectures.  In the past some architectures got this code wrong,
so using this helper function should stop that from happening again.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c
index 1055146a20ebf80062c036da3af7d9aa12cdfe56..883d711bb4bbcd9000809304170cd1ae02cc163a 100644 (file)
--- a/arch/sh/kernel/signal_32.c
+++ b/arch/sh/kernel/signal_32.c
@@ -58,12 +58,13 @@ sys_sigsuspend(old_sigset_t mask,
               unsigned long r5, unsigned long r6, unsigned long r7,
               struct pt_regs __regs)
 {
-       mask &= _BLOCKABLE;
-       spin_lock_irq(&current->sighand->siglock);
+       sigset_t blocked;
+
        current->saved_sigmask = current->blocked;
-       siginitset(&current->blocked, mask);
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+
+       mask &= _BLOCKABLE;
+       siginitset(&blocked, mask);
+       set_current_blocked(&blocked);
 
        current->state = TASK_INTERRUPTIBLE;
        schedule();
@@ -240,11 +241,7 @@ asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5,
                goto badframe;
 
        sigdelsetmask(&set, ~_BLOCKABLE);
-
-       spin_lock_irq(&current->sighand->siglock);
-       current->blocked = set;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+       set_current_blocked(&set);
 
        if (restore_sigcontext(regs, &frame->sc, &r0))
                goto badframe;
@@ -274,10 +271,7 @@ asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5,
                goto badframe;
 
        sigdelsetmask(&set, ~_BLOCKABLE);
-       spin_lock_irq(&current->sighand->siglock);
-       current->blocked = set;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+       set_current_blocked(&set);
 
        if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0))
                goto badframe;
@@ -548,14 +542,8 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
        else
                ret = setup_frame(sig, ka, oldset, regs);
 
-       if (ret == 0) {
-               spin_lock_irq(&current->sighand->siglock);
-               sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
-               if (!(ka->sa.sa_flags & SA_NODEFER))
-                       sigaddset(&current->blocked,sig);
-               recalc_sigpending();
-               spin_unlock_irq(&current->sighand->siglock);
-       }
+       if (ret == 0)
+               block_sigmask(ka, sig);
 
        return ret;
 }

diff --git a/arch/sh/kernel/signal_64.c b/arch/sh/kernel/signal_64.c
index 7b9278d29102ff974d590767512e0275055fe095..3c9a6f7dcdce81662d31d59a2bcce6cc425b3bca 100644 (file)
--- a/arch/sh/kernel/signal_64.c
+++ b/arch/sh/kernel/signal_64.c
@@ -159,14 +159,13 @@ sys_sigsuspend(old_sigset_t mask,
               unsigned long r6, unsigned long r7,
               struct pt_regs * regs)
 {
-       sigset_t saveset;
+       sigset_t saveset, blocked;
 
-       mask &= _BLOCKABLE;
-       spin_lock_irq(&current->sighand->siglock);
        saveset = current->blocked;
-       siginitset(&current->blocked, mask);
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+
+       mask &= _BLOCKABLE;
+       siginitset(&blocked, mask);
+       set_current_blocked(&blocked);
 
        REF_REG_RET = -EINTR;
        while (1) {
@@ -198,11 +197,8 @@ sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
        if (copy_from_user(&newset, unewset, sizeof(newset)))
                return -EFAULT;
        sigdelsetmask(&newset, ~_BLOCKABLE);
-       spin_lock_irq(&current->sighand->siglock);
        saveset = current->blocked;
-       current->blocked = newset;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+       set_current_blocked(&newset);
 
        REF_REG_RET = -EINTR;
        while (1) {
@@ -408,11 +404,7 @@ asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3,
                goto badframe;
 
        sigdelsetmask(&set, ~_BLOCKABLE);
-
-       spin_lock_irq(&current->sighand->siglock);
-       current->blocked = set;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+       set_current_blocked(&set);
 
        if (restore_sigcontext(regs, &frame->sc, &ret))
                goto badframe;
@@ -445,10 +437,7 @@ asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3,
                goto badframe;
 
        sigdelsetmask(&set, ~_BLOCKABLE);
-       spin_lock_irq(&current->sighand->siglock);
-       current->blocked = set;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+       set_current_blocked(&set);
 
        if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ret))
                goto badframe;
@@ -734,14 +723,8 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
        else
                ret = setup_frame(sig, ka, oldset, regs);
 
-       if (ret == 0) {
-               spin_lock_irq(&current->sighand->siglock);
-               sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
-               if (!(ka->sa.sa_flags & SA_NODEFER))
-                       sigaddset(&current->blocked,sig);
-               recalc_sigpending();
-               spin_unlock_irq(&current->sighand->siglock);
-       }
+       if (ret == 0)
+               block_sigmask(ka, sig);
 
        return ret;
 }