linux-kernel - [PATCH 3/3] eCryptfs: Set inode key only once per crypto operation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20071102185308.GC30760@localhost.austin.ibm.com>
Date:	Fri, 2 Nov 2007 13:53:08 -0500
From:	Michael Halcrow <mhalcrow@...ibm.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, ecryptfs-devel@...ts.sourceforge.net,
	trevor.highland@...il.com
Subject: [PATCH 3/3] eCryptfs: Set inode key only once per crypto operation

There is no need to keep re-setting the same key for any given
eCryptfs inode. This patch optimizes the use of the crypto API and
helps performance a bit.

Signed-off-by: Trevor Highland <trevor.highland@...il.com>
Signed-off-by: Michael Halcrow <mhalcrow@...ibm.com>
---
 fs/ecryptfs/crypto.c          |    7 +++++--
 fs/ecryptfs/ecryptfs_kernel.h |    1 +
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 4f14d4c..a0f53aa 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -337,8 +337,11 @@ static int encrypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
 	}
 	/* Consider doing this once, when the file is opened */
 	mutex_lock(&crypt_stat->cs_tfm_mutex);
-	rc = crypto_blkcipher_setkey(crypt_stat->tfm, crypt_stat->key,
-				     crypt_stat->key_size);
+	if (!(crypt_stat->flags & ECRYPTFS_KEY_SET)) {
+		rc = crypto_blkcipher_setkey(crypt_stat->tfm, crypt_stat->key,
+					     crypt_stat->key_size);
+		crypt_stat->flags |= ECRYPTFS_KEY_SET;
+	}
 	if (rc) {
 		ecryptfs_printk(KERN_ERR, "Error setting key; rc = [%d]\n",
 				rc);
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 78b7916..114cb86 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -234,6 +234,7 @@ struct ecryptfs_crypt_stat {
 #define ECRYPTFS_KEY_VALID          0x00000080
 #define ECRYPTFS_METADATA_IN_XATTR  0x00000100
 #define ECRYPTFS_VIEW_AS_ENCRYPTED  0x00000200
+#define ECRYPTFS_KEY_SET            0x00000400
 	u32 flags;
 	unsigned int file_version;
 	size_t iv_bytes;
-- 
1.5.0.6

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/