From: Stephen Smalley Date: Mon, 6 Oct 2014 20:32:52 +0000 (-0400) Subject: selinux: fix inode security list corruption X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=923190d32de4428afbea5e5773be86bea60a9925;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git selinux: fix inode security list corruption sb_finish_set_opts() can race with inode_free_security() when initializing inode security structures for inodes created prior to initial policy load or by the filesystem during ->mount(). This appears to have always been a possible race, but commit 3dc91d4 ("SELinux: Fix possible NULL pointer dereference in selinux_inode_permission()") made it more evident by immediately reusing the unioned list/rcu element of the inode security structure for call_rcu() upon an inode_free_security(). But the underlying issue was already present before that commit as a possible use-after-free of isec. Shivnandan Kumar reported the list corruption and proposed a patch to split the list and rcu elements out of the union as separate fields of the inode_security_struct so that setting the rcu element would not affect the list element. However, this would merely hide the issue and not truly fix the code. This patch instead moves up the deletion of the list entry prior to dropping the sbsec->isec_lock initially. Then, if the inode is dropped subsequently, there will be no further references to the isec. Reported-by: Shivnandan Kumar Signed-off-by: Stephen Smalley Cc: stable@vger.kernel.org Signed-off-by: Paul Moore --- diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 29e64d4ca099..2478976fc894 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -481,6 +481,7 @@ next_inode: list_entry(sbsec->isec_head.next, struct inode_security_struct, list); struct inode *inode = isec->inode; + list_del_init(&isec->list); spin_unlock(&sbsec->isec_lock); inode = igrab(inode); if (inode) { @@ -489,7 +490,6 @@ next_inode: iput(inode); } spin_lock(&sbsec->isec_lock); - list_del_init(&isec->list); goto next_inode; } spin_unlock(&sbsec->isec_lock);