linux-kernel - [PATCH v3 02/17] signal: make kill_as_cred

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Date:   Sat,  2 Jun 2018 12:36:38 +0200
From:   Christian Brauner <christian@...uner.io>
To:     linux-kernel@...r.kernel.org
Cc:     ebiederm@...ssion.com, gregkh@...uxfoundation.org,
        mingo@...nel.org, james.morris@...rosoft.com,
        keescook@...omium.org, peterz@...radead.org, sds@...ho.nsa.gov,
        viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
        oleg@...hat.com, Christian Brauner <christian@...uner.io>
Subject: [PATCH v3 02/17] 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.

Signed-off-by: Christian Brauner <christian@...uner.io>
---
v2->v3:
* unchanged
v1->v2:
* unchanged
v0->v1:
* simplify to use a single return
---
 kernel/signal.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index c756008d589e..6c71d6b8d2b8 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1349,14 +1349,15 @@ 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" */
-- 
2.17.0