MIPS: 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.

Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Patchwork: https://patchwork.linux-mips.org/patch/3363/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index 185ca00c4c84d53be39e2d7e98031f37b6a0d5bf..d5a338a1739c9027fcc3db50c30a59f15f6c2e62 100644 (file)
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -257,11 +257,8 @@ asmlinkage int sys_sigsuspend(nabi_no_regargs struct pt_regs regs)
                return -EFAULT;
        sigdelsetmask(&newset, ~_BLOCKABLE);
 
-       spin_lock_irq(&current->sighand->siglock);
        current->saved_sigmask = current->blocked;
-       current->blocked = newset;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+       set_current_blocked(&newset);
 
        current->state = TASK_INTERRUPTIBLE;
        schedule();
@@ -286,11 +283,8 @@ asmlinkage int sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
                return -EFAULT;
        sigdelsetmask(&newset, ~_BLOCKABLE);
 
-       spin_lock_irq(&current->sighand->siglock);
        current->saved_sigmask = current->blocked;
-       current->blocked = newset;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+       set_current_blocked(&newset);
 
        current->state = TASK_INTERRUPTIBLE;
        schedule();
@@ -362,10 +356,7 @@ asmlinkage void sys_sigreturn(nabi_no_regargs struct pt_regs regs)
                goto badframe;
 
        sigdelsetmask(&blocked, ~_BLOCKABLE);
-       spin_lock_irq(&current->sighand->siglock);
-       current->blocked = blocked;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+       set_current_blocked(&blocked);
 
        sig = restore_sigcontext(&regs, &frame->sf_sc);
        if (sig < 0)
@@ -401,10 +392,7 @@ asmlinkage void sys_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
                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);
 
        sig = restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext);
        if (sig < 0)
@@ -580,12 +568,7 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
        if (ret)
                return ret;
 
-       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);
+       block_sigmask(ka, sig);
 
        return ret;
 }

diff --git a/arch/mips/kernel/signal32.c b/arch/mips/kernel/signal32.c
index 06b5da392e243ec652ba0a2e1dd25128ac005305..ac3b8d89aae51a4a75f14249ddc5a4f894046087 100644 (file)
--- a/arch/mips/kernel/signal32.c
+++ b/arch/mips/kernel/signal32.c
@@ -290,11 +290,8 @@ asmlinkage int sys32_sigsuspend(nabi_no_regargs struct pt_regs regs)
                return -EFAULT;
        sigdelsetmask(&newset, ~_BLOCKABLE);
 
-       spin_lock_irq(&current->sighand->siglock);
        current->saved_sigmask = current->blocked;
-       current->blocked = newset;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+       set_current_blocked(&newset);
 
        current->state = TASK_INTERRUPTIBLE;
        schedule();
@@ -318,11 +315,8 @@ asmlinkage int sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
                return -EFAULT;
        sigdelsetmask(&newset, ~_BLOCKABLE);
 
-       spin_lock_irq(&current->sighand->siglock);
        current->saved_sigmask = current->blocked;
-       current->blocked = newset;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+       set_current_blocked(&newset);
 
        current->state = TASK_INTERRUPTIBLE;
        schedule();
@@ -488,10 +482,7 @@ asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
                goto badframe;
 
        sigdelsetmask(&blocked, ~_BLOCKABLE);
-       spin_lock_irq(&current->sighand->siglock);
-       current->blocked = blocked;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+       set_current_blocked(&blocked);
 
        sig = restore_sigcontext32(&regs, &frame->sf_sc);
        if (sig < 0)
@@ -529,10 +520,7 @@ asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
                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);
 
        sig = restore_sigcontext32(&regs, &frame->rs_uc.uc_mcontext);
        if (sig < 0)

diff --git a/arch/mips/kernel/signal_n32.c b/arch/mips/kernel/signal_n32.c
index ae29e894ab8d0f0cf099d28dbcc1f6cf0751e546..86eb4b04631c43924527231da81e3e23a5b01d0e 100644 (file)
--- a/arch/mips/kernel/signal_n32.c
+++ b/arch/mips/kernel/signal_n32.c
@@ -93,11 +93,8 @@ asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
        sigset_from_compat(&newset, &uset);
        sigdelsetmask(&newset, ~_BLOCKABLE);
 
-       spin_lock_irq(&current->sighand->siglock);
        current->saved_sigmask = current->blocked;
-       current->blocked = newset;
-       recalc_sigpending();
-       spin_unlock_irq(&current->sighand->siglock);
+       set_current_blocked(&newset);
 
        current->state = TASK_INTERRUPTIBLE;
        schedule();
@@ -121,10 +118,7 @@ asmlinkage void sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
                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);
 
        sig = restore_sigcontext(&regs, &frame->rs_uc.uc_mcontext);
        if (sig < 0)