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sanitize audit_ipc_obj() 

* get rid of allocations
* make it return void
* simplify callers

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2008-12-10 03:40:06 -05:00
parent f3298dc4f2
commit a33e675100
4 changed files with 45 additions and 65 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/linux/audit.h
View File

@ -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)

4
ipc/shm.c
View File

@ -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();

9
ipc/util.c
View File

@ -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,

88
kernel/auditsc.c
View File

@ -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;
}
/**