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authorAl Viro <viro@zeniv.linux.org.uk>2008-12-10 03:40:06 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2009-01-04 15:14:39 -0500
commita33e6751003c5ade603737d828b1519d980ce392 (patch)
treeaa484d033e886945aed78172dbdd4d2fd928bacf
parentf3298dc4f2277874d40cb4fc3a6e277317d6603b (diff)
downloadlinux-linaro-stable-a33e6751003c5ade603737d828b1519d980ce392.tar.gz
sanitize audit_ipc_obj()
* get rid of allocations * make it return void * simplify callers Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--include/linux/audit.h9
-rw-r--r--ipc/shm.c4
-rw-r--r--ipc/util.c9
-rw-r--r--kernel/auditsc.c88
4 files changed, 45 insertions, 65 deletions
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 466a953d4bf6..f8578b9088e1 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -443,7 +443,7 @@ extern int audit_set_loginuid(struct task_struct *task, uid_t loginuid);
#define audit_get_loginuid(t) ((t)->loginuid)
#define audit_get_sessionid(t) ((t)->sessionid)
extern void audit_log_task_context(struct audit_buffer *ab);
-extern int __audit_ipc_obj(struct kern_ipc_perm *ipcp);
+extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
extern int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode);
extern int audit_bprm(struct linux_binprm *bprm);
extern void audit_socketcall(int nargs, unsigned long *args);
@@ -460,11 +460,10 @@ extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
const struct cred *old);
extern int __audit_log_capset(pid_t pid, const struct cred *new, const struct cred *old);
-static inline int audit_ipc_obj(struct kern_ipc_perm *ipcp)
+static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
{
if (unlikely(!audit_dummy_context()))
- return __audit_ipc_obj(ipcp);
- return 0;
+ __audit_ipc_obj(ipcp);
}
static inline int audit_fd_pair(int fd1, int fd2)
{
@@ -546,7 +545,7 @@ extern int audit_signals;
#define audit_get_loginuid(t) (-1)
#define audit_get_sessionid(t) (-1)
#define audit_log_task_context(b) do { ; } while (0)
-#define audit_ipc_obj(i) ({ 0; })
+#define audit_ipc_obj(i) ((void)0)
#define audit_ipc_set_perm(q,u,g,m) ({ 0; })
#define audit_bprm(p) ({ 0; })
#define audit_socketcall(n,a) ((void)0)
diff --git a/ipc/shm.c b/ipc/shm.c
index 38a055758a9b..57dd50046cef 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -747,9 +747,7 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
goto out;
}
- err = audit_ipc_obj(&(shp->shm_perm));
- if (err)
- goto out_unlock;
+ audit_ipc_obj(&(shp->shm_perm));
if (!capable(CAP_IPC_LOCK)) {
uid_t euid = current_euid();
diff --git a/ipc/util.c b/ipc/util.c
index 5a1808c774a2..579552abd50a 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -624,10 +624,9 @@ void ipc_rcu_putref(void *ptr)
int ipcperms (struct kern_ipc_perm *ipcp, short flag)
{ /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */
uid_t euid = current_euid();
- int requested_mode, granted_mode, err;
+ int requested_mode, granted_mode;
- if (unlikely((err = audit_ipc_obj(ipcp))))
- return err;
+ audit_ipc_obj(ipcp);
requested_mode = (flag >> 6) | (flag >> 3) | flag;
granted_mode = ipcp->mode;
if (euid == ipcp->cuid ||
@@ -803,9 +802,7 @@ struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd,
goto out_up;
}
- err = audit_ipc_obj(ipcp);
- if (err)
- goto out_unlock;
+ audit_ipc_obj(ipcp);
if (cmd == IPC_SET) {
err = audit_ipc_set_perm(extra_perm, perm->uid,
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 5cda66466e14..73504313264f 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -247,6 +247,12 @@ struct audit_context {
int nargs;
long args[6];
} socketcall;
+ struct {
+ uid_t uid;
+ gid_t gid;
+ mode_t mode;
+ u32 osid;
+ } ipc;
};
#if AUDIT_DEBUG
@@ -605,19 +611,12 @@ static int audit_filter_rules(struct task_struct *tsk,
}
}
/* Find ipc objects that match */
- if (ctx) {
- struct audit_aux_data *aux;
- for (aux = ctx->aux; aux;
- aux = aux->next) {
- if (aux->type == AUDIT_IPC) {
- struct audit_aux_data_ipcctl *axi = (void *)aux;
- if (security_audit_rule_match(axi->osid, f->type, f->op, f->lsm_rule, ctx)) {
- ++result;
- break;
- }
- }
- }
- }
+ if (!ctx || ctx->type != AUDIT_IPC)
+ break;
+ if (security_audit_rule_match(ctx->ipc.osid,
+ f->type, f->op,
+ f->lsm_rule, ctx))
+ ++result;
}
break;
case AUDIT_ARG0:
@@ -1228,7 +1227,7 @@ static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver);
}
-static void show_special(struct audit_context *context)
+static void show_special(struct audit_context *context, int *call_panic)
{
struct audit_buffer *ab;
int i;
@@ -1245,6 +1244,23 @@ static void show_special(struct audit_context *context)
audit_log_format(ab, " a%d=%lx", i,
context->socketcall.args[i]);
break; }
+ case AUDIT_IPC: {
+ u32 osid = context->ipc.osid;
+
+ audit_log_format(ab, "ouid=%u ogid=%u mode=%#o",
+ context->ipc.uid, context->ipc.gid, context->ipc.mode);
+ if (osid) {
+ char *ctx = NULL;
+ u32 len;
+ if (security_secid_to_secctx(osid, &ctx, &len)) {
+ audit_log_format(ab, " osid=%u", osid);
+ *call_panic = 1;
+ } else {
+ audit_log_format(ab, " obj=%s", ctx);
+ security_release_secctx(ctx, len);
+ }
+ }
+ break; }
}
audit_log_end(ab);
}
@@ -1363,26 +1379,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
axi->mqstat.mq_msgsize, axi->mqstat.mq_curmsgs);
break; }
- case AUDIT_IPC: {
- struct audit_aux_data_ipcctl *axi = (void *)aux;
- audit_log_format(ab,
- "ouid=%u ogid=%u mode=%#o",
- axi->uid, axi->gid, axi->mode);
- if (axi->osid != 0) {
- char *ctx = NULL;
- u32 len;
- if (security_secid_to_secctx(
- axi->osid, &ctx, &len)) {
- audit_log_format(ab, " osid=%u",
- axi->osid);
- call_panic = 1;
- } else {
- audit_log_format(ab, " obj=%s", ctx);
- security_release_secctx(ctx, len);
- }
- }
- break; }
-
case AUDIT_IPC_SET_PERM: {
struct audit_aux_data_ipcctl *axi = (void *)aux;
audit_log_format(ab,
@@ -1427,7 +1423,7 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
}
if (context->type)
- show_special(context);
+ show_special(context, &call_panic);
if (context->sockaddr_len) {
ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
@@ -2349,25 +2345,15 @@ int __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
* audit_ipc_obj - record audit data for ipc object
* @ipcp: ipc permissions
*
- * Returns 0 for success or NULL context or < 0 on error.
*/
-int __audit_ipc_obj(struct kern_ipc_perm *ipcp)
+void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
{
- struct audit_aux_data_ipcctl *ax;
struct audit_context *context = current->audit_context;
-
- ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
- if (!ax)
- return -ENOMEM;
-
- ax->uid = ipcp->uid;
- ax->gid = ipcp->gid;
- ax->mode = ipcp->mode;
- security_ipc_getsecid(ipcp, &ax->osid);
- ax->d.type = AUDIT_IPC;
- ax->d.next = context->aux;
- context->aux = (void *)ax;
- return 0;
+ context->ipc.uid = ipcp->uid;
+ context->ipc.gid = ipcp->gid;
+ context->ipc.mode = ipcp->mode;
+ security_ipc_getsecid(ipcp, &context->ipc.osid);
+ context->type = AUDIT_IPC;
}
/**