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smack: Set SMACK64TRANSMUTE only for dirs in smack_inode_setxattr()

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[ Upstream commit 9c82169208dde516510aaba6bbd8b13976690c5d ]

Since the SMACK64TRANSMUTE xattr makes sense only for directories, enforce
this restriction in smack_inode_setxattr().

Cc: stable@vger.kernel.org
Fixes: 5c6d1125f8db ("Smack: Transmute labels on specified directories") # v2.6.38.x
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Roberto Sassu 2023-11-16 10:01:21 +01:00 committed by Greg Kroah-Hartman
parent 9a353d80ba
commit cec55e30e3
1 changed files with 2 additions and 1 deletions
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3
security/smack/smack_lsm.c
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@ -1290,7 +1290,8 @@ static int smack_inode_setxattr(struct dentry *dentry, const char *name,
check_star = 1;
} else if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
check_priv = 1;
if (size != TRANS_TRUE_SIZE ||
if (!S_ISDIR(d_backing_inode(dentry)->i_mode) ||
size != TRANS_TRUE_SIZE ||
strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
rc = -EINVAL;
} else