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 block_sigmask() 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.

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

diff --git a/arch/sh/kernel/signal_32.c b/arch/sh/kernel/signal_32.c
index 7a00304e2642c4c5703460a5ff8e9b9c2a30897b..68ecb698a444b41645085b93b58b2265065fffa2 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 c0e7d10e0bf1027e97796cfd8dba033642fff7df..cc943655cd9eed708b2dd5f5cac4e7a2d856062d 100644 (file)
--- a/arch/sh/kernel/signal_64.c
+++ b/arch/sh/kernel/signal_64.c
@@ -163,14 +163,13 @@ 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) {
@@ -202,11 +201,8 @@ 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) {
@@ -412,11 +408,7 @@ 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;
@@ -449,10 +441,7 @@ 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;
@@ -738,14 +727,8 @@ 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;
 }