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sanitize audit_ipc_set_perm()

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* 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 03:47:15 -05:00
parent a33e675100
commit e816f370cb
3 changed files with 32 additions and 45 deletions
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9
include/linux/audit.h
View file

@ -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; })

9
ipc/util.c
View file

@ -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);

59
kernel/auditsc.c
View file

@ -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)