[PATCH v4 17/19] Smack: Abstract use of ipc security blobs
From: casey@schaufler-ca.com (Casey Schaufler)
Date: 2018-09-22 06:11:19
Also in:
linux-fsdevel, lkml, selinux
Subsystem:
security subsystem, smack security module, the rest · Maintainers:
Paul Moore, James Morris, "Serge E. Hallyn", Casey Schaufler, Linus Torvalds
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> --- security/smack/smack.h | 11 +++++++++++ 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 add19b7efc96..52cea142fcf6 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
@@ -371,6 +372,16 @@ static inline struct inode_smack *smack_inode(const struct inode *inode) return inode->i_security; } +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 6617abb51732..4afc8899f83f 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c@@ -2905,7 +2905,9 @@ 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; } /**
@@ -2916,9 +2918,9 @@ 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; }
@@ -3230,7 +3232,8 @@ 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;
@@ -3251,7 +3254,8 @@ 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; }
--
2.17.1