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smack: Retrieve transmuting information in smack_inode_getsecurity()

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[ Upstream commit 3a3d8fce31 ]

Enhance smack_inode_getsecurity() to retrieve the value for
SMACK64TRANSMUTE from the inode security blob, similarly to SMACK64.

This helps to display accurate values in the situation where the security
labels come from mount options and not from xattrs.

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 2023-05-08 19:02:33 +02:00 committed by Greg Kroah-Hartman
parent 3586b3feed
commit 0e3450487f
1 changed files with 18 additions and 4 deletions
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22
security/smack/smack_lsm.c
View file

@ -1429,10 +1429,19 @@ static int smack_inode_getsecurity(struct user_namespace *mnt_userns,
struct super_block *sbp;
struct inode *ip = (struct inode *)inode;
struct smack_known *isp;
struct inode_smack *ispp;
size_t label_len;
char *label = NULL;
if (strcmp(name, XATTR_SMACK_SUFFIX) == 0)
if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
isp = smk_of_inode(inode);
else {
} else if (strcmp(name, XATTR_SMACK_TRANSMUTE) == 0) {
ispp = smack_inode(inode);
if (ispp->smk_flags & SMK_INODE_TRANSMUTE)
label = TRANS_TRUE;
else
label = "";
} else {
/*
* The rest of the Smack xattrs are only on sockets.
*/
@ -1454,13 +1463,18 @@ static int smack_inode_getsecurity(struct user_namespace *mnt_userns,
return -EOPNOTSUPP;
}
if (!label)
label = isp->smk_known;
label_len = strlen(label);
if (alloc) {
*buffer = kstrdup(isp->smk_known, GFP_KERNEL);
*buffer = kstrdup(label, GFP_KERNEL);
if (*buffer == NULL)
return -ENOMEM;
}
return strlen(isp->smk_known);
return label_len;
}