From: Konstantin Khlebnikov <k.khlebnikov@samsung.com>
Date: Thu, 7 Aug 2014 16:52:49 +0000 (+0400)
Subject: Smack: remove unneeded NULL-termination from securtity label
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=da1b63566c469bf3e2b24182114422e16b1aa34c;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

Smack: remove unneeded NULL-termination from securtity label

Values of extended attributes are stored as binary blobs. NULL-termination
of them isn't required. It just wastes disk space and confuses command-line
tools like getfattr because they have to print that zero byte at the end.

This patch removes terminating zero byte from initial security label in
smack_inode_init_security and cuts it out in function smack_inode_getsecurity
which is used by syscall getxattr. This change seems completely safe, because
function smk_parse_smack ignores everything after first zero byte.

Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@samsung.com>
---

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index afa5ad0e7f72..16ae8534b14c 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -672,7 +672,7 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
 	}
 
 	if (len)
-		*len = strlen(isp) + 1;
+		*len = strlen(isp);
 
 	return 0;
 }
@@ -1076,7 +1076,7 @@ static int smack_inode_getsecurity(const struct inode *inode,
 
 	if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
 		isp = smk_of_inode(inode);
-		ilen = strlen(isp) + 1;
+		ilen = strlen(isp);
 		*buffer = isp;
 		return ilen;
 	}
@@ -1101,7 +1101,7 @@ static int smack_inode_getsecurity(const struct inode *inode,
 	else
 		return -EOPNOTSUPP;
 
-	ilen = strlen(isp) + 1;
+	ilen = strlen(isp);
 	if (rc == 0) {
 		*buffer = isp;
 		rc = ilen;