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Subject[PATCH 11/41] m68k: 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: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
arch/m68k/kernel/signal_mm.c | 24 ++++++++++++------------
arch/m68k/kernel/signal_no.c | 30 ++++++++++++------------------
2 files changed, 24 insertions(+), 30 deletions(-)

diff --git a/arch/m68k/kernel/signal_mm.c b/arch/m68k/kernel/signal_mm.c
index a0afc23..eeeaf3c 100644
--- a/arch/m68k/kernel/signal_mm.c
+++ b/arch/m68k/kernel/signal_mm.c
@@ -97,12 +97,13 @@ int handle_kernel_fault(struct pt_regs *regs)
asmlinkage int
sys_sigsuspend(int unused0, int unused1, old_sigset_t mask)
{
- 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();
@@ -465,8 +466,7 @@ asmlinkage int do_sigreturn(unsigned long __unused)
goto badframe;

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

if (restore_sigcontext(regs, &frame->sc, frame + 1))
goto badframe;
@@ -491,8 +491,7 @@ asmlinkage int do_rt_sigreturn(unsigned long __unused)
goto badframe;

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

if (rt_restore_ucontext(regs, sw, &frame->uc))
goto badframe;
@@ -950,6 +949,7 @@ static void
handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *oldset, struct pt_regs *regs)
{
+ sigset_t blocked;
int err;
/* are we from a system call? */
if (regs->orig_d0 >= 0)
@@ -965,10 +965,10 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
if (err)
return;

- 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();
+ sigaddset(&blocked, sig);
+ set_current_blocked(&blocked);

if (test_thread_flag(TIF_DELAYED_TRACE)) {
regs->sr &= ~0x8000;
diff --git a/arch/m68k/kernel/signal_no.c b/arch/m68k/kernel/signal_no.c
index 36a81bb..97f3c39 100644
--- a/arch/m68k/kernel/signal_no.c
+++ b/arch/m68k/kernel/signal_no.c
@@ -60,12 +60,13 @@ void ret_from_user_rt_signal(void);
asmlinkage int
sys_sigsuspend(int unused0, int unused1, old_sigset_t mask)
{
- 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();
@@ -343,10 +344,7 @@ 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, frame + 1, &d0))
goto badframe;
@@ -372,10 +370,7 @@ asmlinkage int do_rt_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 (rt_restore_ucontext(regs, sw, &frame->uc, &d0))
goto badframe;
@@ -693,6 +688,7 @@ static void
handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *oldset, struct pt_regs *regs)
{
+ sigset_t blocked;
int err;
/* are we from a system call? */
if (regs->orig_d0 >= 0)
@@ -708,12 +704,10 @@ handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info,
if (err)
return;

- 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);

clear_thread_flag(TIF_RESTORE_SIGMASK);
}
--
1.7.4.4


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