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Commit e816f370 authored by Al Viro's avatar Al Viro
Browse files

sanitize audit_ipc_set_perm() 



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

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent a33e6751

include/linux/audit.h

+4 −5
Original line number Diff line number Diff line
@@ -444,7 +444,7 @@ extern int audit_set_loginuid(struct task_struct *task, uid_t loginuid); 
#define audit_get_sessionid(t) ((t)->sessionid)

extern void audit_log_task_context(struct audit_buffer *ab);

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 void __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);

extern int audit_sockaddr(int len, void *addr);
@@ -471,11 +471,10 @@ static inline int audit_fd_pair(int fd1, int fd2) 
		return __audit_fd_pair(fd1, fd2);

	return 0;

}

static inline int audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)

static inline void audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)

{

	if (unlikely(!audit_dummy_context()))

		return __audit_ipc_set_perm(qbytes, uid, gid, mode);

	return 0;

		__audit_ipc_set_perm(qbytes, uid, gid, mode);

}

static inline int audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr)

{
@@ -546,7 +545,7 @@ extern int audit_signals; 
#define audit_get_sessionid(t) (-1)

#define audit_log_task_context(b) do { ; } while (0)

#define audit_ipc_obj(i) ((void)0)

#define audit_ipc_set_perm(q,u,g,m) ({ 0; })

#define audit_ipc_set_perm(q,u,g,m) ((void)0)

#define audit_bprm(p) ({ 0; })

#define audit_socketcall(n,a) ((void)0)

#define audit_fd_pair(n,a) ({ 0; })

ipc/util.c

+2 −7
Original line number Diff line number Diff line
@@ -803,13 +803,9 @@ struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd, 
	}



	audit_ipc_obj(ipcp);



	if (cmd == IPC_SET) {

		err = audit_ipc_set_perm(extra_perm, perm->uid,

	if (cmd == IPC_SET)

		audit_ipc_set_perm(extra_perm, perm->uid,

					 perm->gid, perm->mode);

		if (err)

			goto out_unlock;

	}



	euid = current_euid();

	if (euid == ipcp->cuid ||
@@ -817,7 +813,6 @@ struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd, 
		return ipcp;



	err = -EPERM;

out_unlock:

	ipc_unlock(ipcp);

out_up:

	up_write(&ids->rw_mutex);

kernel/auditsc.c

+26 −33
Original line number Diff line number Diff line
@@ -151,16 +151,6 @@ struct audit_aux_data_mq_getsetattr { 
	struct mq_attr 		mqstat;

};



struct audit_aux_data_ipcctl {

	struct audit_aux_data	d;

	struct ipc_perm		p;

	unsigned long		qbytes;

	uid_t			uid;

	gid_t			gid;

	mode_t			mode;

	u32			osid;

};



struct audit_aux_data_execve {

	struct audit_aux_data	d;

	int argc;
@@ -252,6 +242,11 @@ struct audit_context { 
			gid_t			gid;

			mode_t			mode;

			u32			osid;

			int			has_perm;

			uid_t			perm_uid;

			gid_t			perm_gid;

			mode_t			perm_mode;

			unsigned long		qbytes;

		} ipc;

	};
@@ -1260,6 +1255,19 @@ static void show_special(struct audit_context *context, int *call_panic) 
				security_release_secctx(ctx, len);

			}

		}

		if (context->ipc.has_perm) {

			audit_log_end(ab);

			ab = audit_log_start(context, GFP_KERNEL,

					     AUDIT_IPC_SET_PERM);

			audit_log_format(ab,

				"qbytes=%lx ouid=%u ogid=%u mode=%#o",

				context->ipc.qbytes,

				context->ipc.perm_uid,

				context->ipc.perm_gid,

				context->ipc.perm_mode);

			if (!ab)

				return;

		}

		break; }

	}

	audit_log_end(ab);
@@ -1379,13 +1387,6 @@ 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_SET_PERM: {

			struct audit_aux_data_ipcctl *axi = (void *)aux;

			audit_log_format(ab,

				"qbytes=%lx ouid=%u ogid=%u mode=%#o",

				axi->qbytes, axi->uid, axi->gid, axi->mode);

			break; }



		case AUDIT_EXECVE: {

			struct audit_aux_data_execve *axi = (void *)aux;

			audit_log_execve_info(context, &ab, axi);
@@ -2352,6 +2353,7 @@ void __audit_ipc_obj(struct kern_ipc_perm *ipcp) 
	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);

	context->type = AUDIT_IPC;

}
@@ -2363,26 +2365,17 @@ void __audit_ipc_obj(struct kern_ipc_perm *ipcp) 
 * @gid: msgq group id

 * @mode: msgq mode (permissions)

 *

 * Returns 0 for success or NULL context or < 0 on error.

 * Called only after audit_ipc_obj().

 */

int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)

void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)

{

	struct audit_aux_data_ipcctl *ax;

	struct audit_context *context = current->audit_context;



	ax = kmalloc(sizeof(*ax), GFP_ATOMIC);

	if (!ax)

		return -ENOMEM;



	ax->qbytes = qbytes;

	ax->uid = uid;

	ax->gid = gid;

	ax->mode = mode;



	ax->d.type = AUDIT_IPC_SET_PERM;

	ax->d.next = context->aux;

	context->aux = (void *)ax;

	return 0;

	context->ipc.qbytes = qbytes;

	context->ipc.perm_uid = uid;

	context->ipc.perm_gid = gid;

	context->ipc.perm_mode = mode;

	context->ipc.has_perm = 1;

}



int audit_bprm(struct linux_binprm *bprm)