linux-kernel - [PATCH] Security: List corruption occured during file system automation test

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Message-id: <1407929653-27228-1-git-send-email-shivnandan.k@samsung.com>
Date:	Wed, 13 Aug 2014 17:04:13 +0530
From:	shivnandan.k@...sung.com
To:	sds@...ho.nsa.gov, james.l.morris@...cle.com,
	eparis@...isplace.org, selinux@...ho.nsa.gov
Cc:	cpgs@...sung.com, shivnandan.k@...sung.com,
	ashish.kalra@...sung.com, mohammad.a2@...sung.com,
	rajat.suri@...sung.com, shiv.jnumca08@...il.com,
	linux-kernel@...r.kernel.org, vidushi.koul@...sung.com,
	narendra.m1@...sung.com
Subject: [PATCH] Security: List corruption occured during file system
 automation test

From: Shivnandan Kumar <shivnandan.k@...sung.com>

List element was freed by  inode_free_security and then it uses rcu
element to point inode_free_rcu, since it inside a union so it
shares memory, sb_finish_set_opts now also try to free list element,
but since it is overriden by rcu element , it found list is corrupted
which leads to kernel panic, We have removed union element so now
memory is not shared by list and rcu element

Signed-off-by: Shivnandan Kumar <shivnandan.k@...sung.com>
---
 selinux/include/objsec.h |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/selinux/include/objsec.h b/selinux/include/objsec.h
index 7b1830b..2ba21ca 100644
--- a/selinux/include/objsec.h
+++ b/selinux/include/objsec.h
@@ -38,10 +38,8 @@ struct task_security_struct {
 
 struct inode_security_struct {
 	struct inode *inode;	/* back pointer to inode object */
-	union {
-		struct list_head list;	/* list of inode_security_struct */
-		struct rcu_head rcu;	/* for freeing the inode_security_struct */
-	};
+	struct list_head list;	/* list of inode_security_struct */
+	struct rcu_head rcu;	/* for freeing the inode_security_struct */
 	u32 task_sid;		/* SID of creating task */
 	u32 sid;		/* SID of this object */
 	u16 sclass;		/* security class of this object */
-- 
1.7.9.5

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