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 afa5ad0..16ae853 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -672,7 +672,7 @@
}
if (len)
- *len = strlen(isp) + 1;
+ *len = strlen(isp);
return 0;
}
@@ -1076,7 +1076,7 @@
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 @@
else
return -EOPNOTSUPP;
- ilen = strlen(isp) + 1;
+ ilen = strlen(isp);
if (rc == 0) {
*buffer = isp;
rc = ilen;