signal: make kill_as_cred_perm() return bool

kill_as_cred_perm() already behaves like a boolean function.  Let's
actually declare it as such too.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Christian Brauner <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Morris <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephen Smalley <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/kernel/signal.c b/kernel/signal.c
index 8a828baa0f93b820f9169fc4a7681d3f0610ecc1..5b0fb57b23f0d73540be15050587f2f6e9c0e2fb 100644 (file)
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1339,14 +1339,15 @@ static int kill_proc_info(int sig, struct siginfo *info, pid_t pid)
        return error;
 }
 
-static int kill_as_cred_perm(const struct cred *cred,
-                            struct task_struct *target)
+static inline bool kill_as_cred_perm(const struct cred *cred,
+                                    struct task_struct *target)
 {
        const struct cred *pcred = __task_cred(target);
-       if (!uid_eq(cred->euid, pcred->suid) && !uid_eq(cred->euid, pcred->uid) &&
-           !uid_eq(cred->uid,  pcred->suid) && !uid_eq(cred->uid,  pcred->uid))
-               return 0;
-       return 1;
+
+       return uid_eq(cred->euid, pcred->suid) ||
+              uid_eq(cred->euid, pcred->uid) ||
+              uid_eq(cred->uid, pcred->suid) ||
+              uid_eq(cred->uid, pcred->uid);
 }
 
 /* like kill_pid_info(), but doesn't use uid/euid of "current" */