linux-kernel - [PATCH 06/20] ipc/shm: Do not use ipc_rcu

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Message-Id: <20170525185107.12869-7-manfred@colorfullife.com>
Date:   Thu, 25 May 2017 20:50:53 +0200
From:   Manfred Spraul <manfred@...orfullife.com>
To:     mtk.manpages@...il.com, Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, 1vier1@....de,
        Davidlohr Bueso <dave@...olabs.net>, mingo@...nel.org,
        peterz@...radead.org, fabf@...net.be,
        Manfred Spraul <manfred@...orfullife.com>
Subject: [PATCH 06/20] ipc/shm: Do not use ipc_rcu_free()

From: Kees Cook <keescook@...omium.org>

Avoid using ipc_rcu_free, since it just re-finds the original structure
pointer. For the pre-list-init failure path, there is no RCU needed,
since it was just allocated. It can be directly freed.

Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Manfred Spraul <manfred@...orfullife.com>
---
 ipc/shm.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/ipc/shm.c b/ipc/shm.c
index 2eb85bd..77e1bff 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -172,6 +172,11 @@ static inline void shm_lock_by_ptr(struct shmid_kernel *ipcp)
 	ipc_lock_object(&ipcp->shm_perm);
 }
 
+static void __shm_free(struct shmid_kernel *shp)
+{
+	kvfree(shp);
+}
+
 static void shm_rcu_free(struct rcu_head *head)
 {
 	struct kern_ipc_perm *ptr = container_of(head, struct kern_ipc_perm,
@@ -179,7 +184,7 @@ static void shm_rcu_free(struct rcu_head *head)
 	struct shmid_kernel *shp = container_of(ptr, struct shmid_kernel,
 							shm_perm);
 	security_shm_free(shp);
-	ipc_rcu_free(head);
+	__shm_free(shp);
 }
 
 static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)
@@ -557,7 +562,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
 	shp->shm_perm.security = NULL;
 	error = security_shm_alloc(shp);
 	if (error) {
-		ipc_rcu_putref(&shp->shm_perm, ipc_rcu_free);
+		__shm_free(shp);
 		return error;
 	}
 
-- 
2.9.3