linux-ext4 - [PATCH 10/22] ext4 crypto: validate context consistency on lookup

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Message-Id: <1428012659-12709-11-git-send-email-tytso@mit.edu>
Date:	Thu,  2 Apr 2015 18:10:47 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:	jaegeuk@...nel.org, mhalcrow@...gle.com,
	Theodore Ts'o <tytso@....edu>
Subject: [PATCH 10/22] ext4 crypto: validate context consistency on lookup

Change-Id: Ifb904b2bec9300b178062ee70cbdfd333f03f865
Signed-off-by: Michael Halcrow <mhalcrow@...gle.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
---
 fs/ext4/namei.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 2fb55fd..12d2592 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1418,6 +1418,13 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
 			return ERR_PTR(-EIO);
 		}
 	}
+	if (ext4_encrypted_inode(dir) &&
+	    !ext4_is_child_context_consistent_with_parent(dir,
+							  dentry->d_inode)) {
+		printk(KERN_ERR "%s: Security warning: Inconsistent contexts\n",
+		       __func__);
+		return ERR_PTR(-EINVAL);
+	}
 	return d_splice_alias(inode, dentry);
 }
 
-- 
2.3.0

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