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smack: Handle SMACK64TRANSMUTE in smack_inode_setsecurity()

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If the SMACK64TRANSMUTE xattr is provided, and the inode is a directory,
update the in-memory inode flags by setting SMK_INODE_TRANSMUTE.

Cc: stable@vger.kernel.org
Fixes: 5c6d1125f8 ("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>
This commit is contained in:
Roberto Sassu 2023-11-16 10:01:22 +01:00 committed by Casey Schaufler
parent 9c82169208
commit ac02f007d6
1 changed files with 9 additions and 0 deletions
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9
security/smack/smack_lsm.c
View File

@ -2856,6 +2856,15 @@ static int smack_inode_setsecurity(struct inode *inode, const char *name,
if (value == NULL || size > SMK_LONGLABEL || size == 0)
return -EINVAL;
if (strcmp(name, XATTR_SMACK_TRANSMUTE) == 0) {
if (!S_ISDIR(inode->i_mode) || size != TRANS_TRUE_SIZE ||
strncmp(value, TRANS_TRUE, TRANS_TRUE_SIZE) != 0)
return -EINVAL;
nsp->smk_flags |= SMK_INODE_TRANSMUTE;
return 0;
}
skp = smk_import_entry(value, size);
if (IS_ERR(skp))
return PTR_ERR(skp);