[PATCH v11 08/25] LSM: Use lsmblob in security_ipc_getsecid
From: Casey Schaufler <casey@schaufler-ca.com>
Date: 2019-11-13 18:20:09
Also in:
selinux
Subsystem:
audit subsystem, security subsystem, the rest · Maintainers:
Paul Moore, Eric Paris, James Morris, "Serge E. Hallyn", Linus Torvalds
Possibly related (same subject, not in this thread)
- 2019-11-13 · [PATCH v11 08/25] LSM: Use lsmblob in security_ipc_getsecid · Casey Schaufler <casey@schaufler-ca.com>
- 2019-11-13 · [PATCH v11 08/25] LSM: Use lsmblob in security_ipc_getsecid · Casey Schaufler <casey@schaufler-ca.com>
There may be more than one LSM that provides IPC data for auditing. Change security_ipc_getsecid() to fill in a lsmblob structure instead of the u32 secid. The audit data structure containing the secid will be updated later, so there is a bit of scaffolding here. Reviewed-by: Kees Cook <redacted> Reviewed-by: John Johansen <john.johansen@canonical.com> Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> --- include/linux/security.h | 7 ++++--- kernel/auditsc.c | 5 ++++- security/security.c | 12 +++++++++--- 3 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/include/linux/security.h b/include/linux/security.h
index a3e99bccb1bb..9519b4fb43ae 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h@@ -464,7 +464,7 @@ int security_task_prctl(int option, unsigned long arg2, unsigned long arg3, unsigned long arg4, unsigned long arg5); void security_task_to_inode(struct task_struct *p, struct inode *inode); int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag); -void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid); +void security_ipc_getsecid(struct kern_ipc_perm *ipcp, struct lsmblob *blob); int security_msg_msg_alloc(struct msg_msg *msg); void security_msg_msg_free(struct msg_msg *msg); int security_msg_queue_alloc(struct kern_ipc_perm *msq);
@@ -1172,9 +1172,10 @@ static inline int security_ipc_permission(struct kern_ipc_perm *ipcp, return 0; } -static inline void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) +static inline void security_ipc_getsecid(struct kern_ipc_perm *ipcp, + struct lsmblob *blob) { - *secid = 0; + lsmblob_init(blob, 0); } static inline int security_msg_msg_alloc(struct msg_msg *msg)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 04803c3099b2..ce8bf2d8f8d2 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c@@ -2285,11 +2285,14 @@ void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat) void __audit_ipc_obj(struct kern_ipc_perm *ipcp) { struct audit_context *context = audit_context(); + struct lsmblob blob; context->ipc.uid = ipcp->uid; context->ipc.gid = ipcp->gid; context->ipc.mode = ipcp->mode; context->ipc.has_perm = 0; - security_ipc_getsecid(ipcp, &context->ipc.osid); + security_ipc_getsecid(ipcp, &blob); + /* scaffolding on the [0] - change "osid" to a lsmblob */ + context->ipc.osid = blob.secid[0]; context->type = AUDIT_IPC; }
diff --git a/security/security.c b/security/security.c
index 0fc75a31a6bb..b60c6a51f622 100644
--- a/security/security.c
+++ b/security/security.c@@ -1783,10 +1783,16 @@ int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag) return call_int_hook(ipc_permission, 0, ipcp, flag); } -void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) +void security_ipc_getsecid(struct kern_ipc_perm *ipcp, struct lsmblob *blob) { - *secid = 0; - call_void_hook(ipc_getsecid, ipcp, secid); + struct security_hook_list *hp; + + lsmblob_init(blob, 0); + hlist_for_each_entry(hp, &security_hook_heads.ipc_getsecid, list) { + if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) + continue; + hp->hook.ipc_getsecid(ipcp, &blob->secid[hp->lsmid->slot]); + } } int security_msg_msg_alloc(struct msg_msg *msg)
--
2.20.1