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signal: make unhandled_signal() return bool

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unhandled_signal() already behaves like a boolean function.  Let's
actually declare it as such too.  All callers treat it as such too.

Link: http://lkml.kernel.org/r/20180602103653.18181-13-christian@brauner.io
Signed-off-by: Christian Brauner <christian@brauner.io>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Morris <james.morris@microsoft.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christian Brauner 2018-08-21 22:00:34 -07:00 • committed by Linus Torvalds
parent 09ae854edb
commit 67a48a2447
2 changed files with 6 additions and 4 deletions
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2
include/linux/signal.h
View file

@ -287,7 +287,7 @@ static inline void disallow_signal(int sig)
extern struct kmem_cache *sighand_cachep;
int unhandled_signal(struct task_struct *tsk, int sig);
extern bool unhandled_signal(struct task_struct *tsk, int sig);
/*
* In POSIX a signal is sent either to a specific thread (Linux task)

8
kernel/signal.c
View file

@ -505,13 +505,15 @@ flush_signal_handlers(struct task_struct *t, int force_default)
}
}
int unhandled_signal(struct task_struct *tsk, int sig)
bool unhandled_signal(struct task_struct *tsk, int sig)
{
void __user *handler = tsk->sighand->action[sig-1].sa.sa_handler;
if (is_global_init(tsk))
return 1;
return true;
if (handler != SIG_IGN && handler != SIG_DFL)
return 0;
return false;
/* if ptraced, let the tracer determine */
return !tsk->ptrace;
}