Commit c1095c6d authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
Browse files

signals: sys_ssetmask/sys_rt_sigsuspend should use set_current_blocked() 



sys_ssetmask(), sys_rt_sigsuspend() and compat_sys_rt_sigsuspend()
change ->blocked directly.  This is not correct, see the changelog in
e6fa16ab "signal: sigprocmask() should do retarget_shared_pending()"

Change them to use set_current_blocked().

Another change is that now we are doing ->saved_sigmask = ->blocked
lockless, it doesn't make any sense to do this under ->siglock.

Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
Reviewed-by: default avatarMatt Fleming <matt.fleming@linux.intel.com>
Acked-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 678624e4

kernel/compat.c

+1 −4
Original line number Diff line number Diff line
@@ -992,11 +992,8 @@ asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat 
	sigset_from_compat(&newset, &newset32);

	sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));



	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();

kernel/signal.c

+5 −12
Original line number Diff line number Diff line
@@ -3102,15 +3102,11 @@ SYSCALL_DEFINE0(sgetmask) 


SYSCALL_DEFINE1(ssetmask, int, newmask)

{

	int old;



	spin_lock_irq(&current->sighand->siglock);

	old = current->blocked.sig[0];

	int old = current->blocked.sig[0];

	sigset_t newset;



	siginitset(&current->blocked, newmask & ~(sigmask(SIGKILL)|

						  sigmask(SIGSTOP)));

	recalc_sigpending();

	spin_unlock_irq(&current->sighand->siglock);

	siginitset(&newset, newmask & ~(sigmask(SIGKILL) | sigmask(SIGSTOP)));

	set_current_blocked(&newset);



	return old;

}
@@ -3167,11 +3163,8 @@ SYSCALL_DEFINE2(rt_sigsuspend, sigset_t __user *, unewset, size_t, sigsetsize) 
		return -EFAULT;

	sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));



	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();

CRA Git | Maintained and supported by SUSTech CRA and CCSE