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Subject[PATCH 29/41] tile: Use set_current_blocked()
Date
From: Matt Fleming <matt.fleming@intel.com>

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.

Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
arch/tile/kernel/compat_signal.c | 5 +----
arch/tile/kernel/signal.c | 16 ++++++----------
2 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/arch/tile/kernel/compat_signal.c b/arch/tile/kernel/compat_signal.c
index a7869ad..77763cc 100644
--- a/arch/tile/kernel/compat_signal.c
+++ b/arch/tile/kernel/compat_signal.c
@@ -303,10 +303,7 @@ long compat_sys_rt_sigreturn(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);

if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
goto badframe;
diff --git a/arch/tile/kernel/signal.c b/arch/tile/kernel/signal.c
index bedaf4e..6ddceec 100644
--- a/arch/tile/kernel/signal.c
+++ b/arch/tile/kernel/signal.c
@@ -97,10 +97,7 @@ SYSCALL_DEFINE1(rt_sigreturn, 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);

if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
goto badframe;
@@ -286,13 +283,12 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
* the work_pending path in the return-to-user code, and
* either way we can re-enable interrupts unconditionally.
*/
- spin_lock_irq(&current->sighand->siglock);
- sigorsets(&current->blocked,
- &current->blocked, &ka->sa.sa_mask);
+ sigset_t blocked;
+
+ sigorsets(&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);
+ sigaddset(&blocked, sig);
+ set_current_blocked(&blocked);
}

return ret;
--
1.7.4.4


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