5.4-stable review patch. If anyone has any objections, please let me know.
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From: Roberto Sassu roberto.sassu@huawei.com
[ 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 --- security/smack/smack_lsm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 6f2613f874fa9..65743be5b30f5 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -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