On 5/8/2023 10:02 AM, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
>
> 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.
I will kick the tires on these patches. They look good at first glance.
>
> Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
> ---
> security/smack/smack_lsm.c | 22 ++++++++++++++++++----
> 1 file changed, 18 insertions(+), 4 deletions(-)
>
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index 7a3e9ab137d..c7e37ed2799 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -1463,10 +1463,19 @@ static int smack_inode_getsecurity(struct mnt_idmap *idmap,
> struct super_block *sbp;
> struct inode *ip = 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.
> */
> @@ -1488,13 +1497,18 @@ static int smack_inode_getsecurity(struct mnt_idmap *idmap,
> 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;
> }
>
>
