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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>
This commit is contained in:
Konstantin Khlebnikov 2014-08-07 20:52:49 +04:00 committed by Casey Schaufler
parent b862e561ba
commit da1b63566c
1 changed files with 3 additions and 3 deletions
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6
security/smack/smack_lsm.c
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@ -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;