diff options
| author | Casey Schaufler <casey@schaufler-ca.com> | 2018-09-21 17:19:54 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2019-01-08 13:18:45 -0800 |
| commit | 019bcca4626a9ed119e1d9ebfadb9fdbdcf9b35b (patch) | |
| tree | e6f19e844748ee33d6b78a9cae1169ad2494f669 /security/smack | |
| parent | 7c6538280ae99eaebd589a5c029e1ed1c063909c (diff) | |
Smack: Abstract use of ipc security blobs
Don't use the ipc->security pointer directly.
Don't use the msg_msg->security pointer directly.
Provide helper functions that provides the security blob pointers.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'security/smack')
| -rw-r--r-- | security/smack/smack.h | 11 | ||||
| -rw-r--r-- | security/smack/smack_lsm.c | 14 |
2 files changed, 20 insertions, 5 deletions
diff --git a/security/smack/smack.h b/security/smack/smack.h index bf0abc35ca1c..0adddbeecc62 100644 --- a/security/smack/smack.h +++ b/security/smack/smack.h @@ -24,6 +24,7 @@ #include <linux/list.h> #include <linux/rculist.h> #include <linux/lsm_audit.h> +#include <linux/msg.h> /* * Use IPv6 port labeling if IPv6 is enabled and secmarks @@ -373,6 +374,16 @@ static inline struct inode_smack *smack_inode(const struct inode *inode) return inode->i_security + smack_blob_sizes.lbs_inode; } +static inline struct smack_known **smack_msg_msg(const struct msg_msg *msg) +{ + return (struct smack_known **)&msg->security; +} + +static inline struct smack_known **smack_ipc(const struct kern_ipc_perm *ipc) +{ + return (struct smack_known **)&ipc->security; +} + /* * Is the directory transmuting? */ diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 804897c82810..154521b6843b 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -2834,7 +2834,9 @@ static void smack_msg_msg_free_security(struct msg_msg *msg) */ static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp) { - return (struct smack_known *)isp->security; + struct smack_known **blob = smack_ipc(isp); + + return *blob; } /** @@ -2845,9 +2847,9 @@ static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp) */ static int smack_ipc_alloc_security(struct kern_ipc_perm *isp) { - struct smack_known *skp = smk_of_current(); + struct smack_known **blob = smack_ipc(isp); - isp->security = skp; + *blob = smk_of_current(); return 0; } @@ -3159,7 +3161,8 @@ static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg */ static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) { - struct smack_known *iskp = ipp->security; + struct smack_known **blob = smack_ipc(ipp); + struct smack_known *iskp = *blob; int may = smack_flags_to_may(flag); struct smk_audit_info ad; int rc; @@ -3180,7 +3183,8 @@ static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag) */ static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid) { - struct smack_known *iskp = ipp->security; + struct smack_known **blob = smack_ipc(ipp); + struct smack_known *iskp = *blob; *secid = iskp->smk_secid; } |