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Subject[PATCH 08/41] h8300: 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: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
arch/h8300/kernel/signal.c | 36 +++++++++++++-----------------------
1 files changed, 13 insertions(+), 23 deletions(-)

diff --git a/arch/h8300/kernel/signal.c b/arch/h8300/kernel/signal.c
index af842c3..4c06f98 100644
--- a/arch/h8300/kernel/signal.c
+++ b/arch/h8300/kernel/signal.c
@@ -57,14 +57,13 @@ asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
asmlinkage int do_sigsuspend(struct pt_regs *regs)
{
old_sigset_t mask = regs->er3;
- 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);

regs->er0 = -EINTR;
while (1) {
@@ -90,11 +89,8 @@ do_rt_sigsuspend(struct pt_regs *regs)
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);

regs->er0 = -EINTR;
while (1) {
@@ -232,10 +228,7 @@ asmlinkage int do_sigreturn(unsigned long __unused,...)
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, &er0))
goto badframe;
@@ -260,10 +253,7 @@ asmlinkage int do_rt_sigreturn(unsigned long __unused,...)
goto badframe;

sigdelsetmask(&set, ~_BLOCKABLE);
- spin_unlock_irq(&current->sighand->siglock);
- current->blocked = set;
- recalc_sigpending();
- spin_lock_irq(&current->sighand->siglock);
+ set_current_blocked(&set);

if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &er0))
goto badframe;
@@ -463,6 +453,8 @@ static void
handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
sigset_t *oldset, struct pt_regs * regs)
{
+ sigset_t blocked;
+
/* are we from a system call? */
if (regs->orig_er0 >= 0) {
switch (regs->er0) {
@@ -489,12 +481,10 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
else
setup_frame(sig, ka, oldset, regs);

- spin_lock_irq(&current->sighand->siglock);
- sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
+ 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);
}

/*
--
1.7.4.4


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