sanitize AUDIT_MQ_SENDRECV
* logging the original value of *msg_prio in mq_timedreceive(2)
is insane - the argument is write-only (i.e. syscall always
ignores the original value and only overwrites it).
* merge __audit_mq_timed{send,receive}
* don't do copy_from_user() twice
* don't mess with allocations in auditsc part
* ... and don't bother checking !audit_enabled and !context in there -
we'd already checked for audit_dummy_context().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
20114f71b2
commit
c32c8af43b
3 changed files with 63 additions and 135 deletions
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@ -451,8 +451,7 @@ extern int audit_sockaddr(int len, void *addr);
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extern int __audit_fd_pair(int fd1, int fd2);
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extern int audit_set_macxattr(const char *name);
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extern int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr);
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extern int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec __user *u_abs_timeout);
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extern int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, unsigned int __user *u_msg_prio, const struct timespec __user *u_abs_timeout);
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extern void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout);
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extern void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification);
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extern void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat);
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extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
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@ -482,17 +481,10 @@ static inline int audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u
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return __audit_mq_open(oflag, mode, u_attr);
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return 0;
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}
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static inline int audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec __user *u_abs_timeout)
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static inline void audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec *abs_timeout)
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{
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if (unlikely(!audit_dummy_context()))
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return __audit_mq_timedsend(mqdes, msg_len, msg_prio, u_abs_timeout);
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return 0;
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}
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static inline int audit_mq_timedreceive(mqd_t mqdes, size_t msg_len, unsigned int __user *u_msg_prio, const struct timespec __user *u_abs_timeout)
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{
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if (unlikely(!audit_dummy_context()))
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return __audit_mq_timedreceive(mqdes, msg_len, u_msg_prio, u_abs_timeout);
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return 0;
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__audit_mq_sendrecv(mqdes, msg_len, msg_prio, abs_timeout);
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}
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static inline void audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
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{
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@ -550,8 +542,7 @@ extern int audit_signals;
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#define audit_sockaddr(len, addr) ({ 0; })
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#define audit_set_macxattr(n) do { ; } while (0)
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#define audit_mq_open(o,m,a) ({ 0; })
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#define audit_mq_timedsend(d,l,p,t) ({ 0; })
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#define audit_mq_timedreceive(d,l,p,t) ({ 0; })
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#define audit_mq_sendrecv(d,l,p,t) ((void)0)
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#define audit_mq_notify(d,n) ((void)0)
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#define audit_mq_getsetattr(d,s) ((void)0)
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#define audit_log_bprm_fcaps(b, ncr, ocr) ({ 0; })
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54
ipc/mqueue.c
54
ipc/mqueue.c
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@ -524,31 +524,27 @@ static void __do_notify(struct mqueue_inode_info *info)
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wake_up(&info->wait_q);
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}
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static long prepare_timeout(const struct timespec __user *u_arg)
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static long prepare_timeout(struct timespec *p)
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{
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struct timespec ts, nowts;
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struct timespec nowts;
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long timeout;
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if (u_arg) {
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if (unlikely(copy_from_user(&ts, u_arg,
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sizeof(struct timespec))))
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return -EFAULT;
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if (unlikely(ts.tv_nsec < 0 || ts.tv_sec < 0
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|| ts.tv_nsec >= NSEC_PER_SEC))
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if (p) {
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if (unlikely(p->tv_nsec < 0 || p->tv_sec < 0
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|| p->tv_nsec >= NSEC_PER_SEC))
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return -EINVAL;
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nowts = CURRENT_TIME;
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/* first subtract as jiffies can't be too big */
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ts.tv_sec -= nowts.tv_sec;
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if (ts.tv_nsec < nowts.tv_nsec) {
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ts.tv_nsec += NSEC_PER_SEC;
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ts.tv_sec--;
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p->tv_sec -= nowts.tv_sec;
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if (p->tv_nsec < nowts.tv_nsec) {
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p->tv_nsec += NSEC_PER_SEC;
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p->tv_sec--;
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}
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ts.tv_nsec -= nowts.tv_nsec;
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if (ts.tv_sec < 0)
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p->tv_nsec -= nowts.tv_nsec;
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if (p->tv_sec < 0)
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return 0;
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timeout = timespec_to_jiffies(&ts) + 1;
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timeout = timespec_to_jiffies(p) + 1;
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} else
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return MAX_SCHEDULE_TIMEOUT;
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@ -829,17 +825,22 @@ asmlinkage long sys_mq_timedsend(mqd_t mqdes, const char __user *u_msg_ptr,
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struct ext_wait_queue *receiver;
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struct msg_msg *msg_ptr;
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struct mqueue_inode_info *info;
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struct timespec ts, *p = NULL;
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long timeout;
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int ret;
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ret = audit_mq_timedsend(mqdes, msg_len, msg_prio, u_abs_timeout);
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if (ret != 0)
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return ret;
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if (u_abs_timeout) {
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if (copy_from_user(&ts, u_abs_timeout,
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sizeof(struct timespec)))
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return -EFAULT;
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p = &ts;
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}
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if (unlikely(msg_prio >= (unsigned long) MQ_PRIO_MAX))
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return -EINVAL;
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timeout = prepare_timeout(u_abs_timeout);
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audit_mq_sendrecv(mqdes, msg_len, msg_prio, p);
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timeout = prepare_timeout(p);
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ret = -EBADF;
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filp = fget(mqdes);
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@ -918,12 +919,17 @@ asmlinkage ssize_t sys_mq_timedreceive(mqd_t mqdes, char __user *u_msg_ptr,
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struct inode *inode;
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struct mqueue_inode_info *info;
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struct ext_wait_queue wait;
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struct timespec ts, *p = NULL;
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ret = audit_mq_timedreceive(mqdes, msg_len, u_msg_prio, u_abs_timeout);
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if (ret != 0)
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return ret;
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if (u_abs_timeout) {
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if (copy_from_user(&ts, u_abs_timeout,
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sizeof(struct timespec)))
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return -EFAULT;
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p = &ts;
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}
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timeout = prepare_timeout(u_abs_timeout);
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audit_mq_sendrecv(mqdes, msg_len, 0, p);
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timeout = prepare_timeout(p);
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ret = -EBADF;
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filp = fget(mqdes);
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127
kernel/auditsc.c
127
kernel/auditsc.c
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@ -131,14 +131,6 @@ struct audit_aux_data_mq_open {
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struct mq_attr attr;
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};
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struct audit_aux_data_mq_sendrecv {
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struct audit_aux_data d;
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mqd_t mqdes;
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size_t msg_len;
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unsigned int msg_prio;
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struct timespec abs_timeout;
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};
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struct audit_aux_data_execve {
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struct audit_aux_data d;
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int argc;
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@ -244,6 +236,12 @@ struct audit_context {
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mqd_t mqdes;
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int sigev_signo;
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} mq_notify;
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struct {
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mqd_t mqdes;
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size_t msg_len;
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unsigned int msg_prio;
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struct timespec abs_timeout;
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} mq_sendrecv;
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};
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#if AUDIT_DEBUG
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@ -1265,6 +1263,16 @@ static void show_special(struct audit_context *context, int *call_panic)
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return;
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}
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break; }
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case AUDIT_MQ_SENDRECV: {
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audit_log_format(ab,
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"mqdes=%d msg_len=%zd msg_prio=%u "
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"abs_timeout_sec=%ld abs_timeout_nsec=%ld",
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context->mq_sendrecv.mqdes,
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context->mq_sendrecv.msg_len,
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context->mq_sendrecv.msg_prio,
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context->mq_sendrecv.abs_timeout.tv_sec,
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context->mq_sendrecv.abs_timeout.tv_nsec);
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break; }
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case AUDIT_MQ_NOTIFY: {
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audit_log_format(ab, "mqdes=%d sigev_signo=%d",
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context->mq_notify.mqdes,
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@ -1370,15 +1378,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
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axi->attr.mq_curmsgs);
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break; }
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case AUDIT_MQ_SENDRECV: {
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struct audit_aux_data_mq_sendrecv *axi = (void *)aux;
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audit_log_format(ab,
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"mqdes=%d msg_len=%zd msg_prio=%u "
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"abs_timeout_sec=%ld abs_timeout_nsec=%ld",
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axi->mqdes, axi->msg_len, axi->msg_prio,
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axi->abs_timeout.tv_sec, axi->abs_timeout.tv_nsec);
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break; }
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case AUDIT_EXECVE: {
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struct audit_aux_data_execve *axi = (void *)aux;
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audit_log_execve_info(context, &ab, axi);
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@ -2171,97 +2170,29 @@ int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr)
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}
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/**
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* __audit_mq_timedsend - record audit data for a POSIX MQ timed send
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* __audit_mq_sendrecv - record audit data for a POSIX MQ timed send/receive
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* @mqdes: MQ descriptor
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* @msg_len: Message length
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* @msg_prio: Message priority
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* @u_abs_timeout: Message timeout in absolute time
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* @abs_timeout: Message timeout in absolute time
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*
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* Returns 0 for success or NULL context or < 0 on error.
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*/
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int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
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const struct timespec __user *u_abs_timeout)
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void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
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const struct timespec *abs_timeout)
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{
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struct audit_aux_data_mq_sendrecv *ax;
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struct audit_context *context = current->audit_context;
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struct timespec *p = &context->mq_sendrecv.abs_timeout;
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if (!audit_enabled)
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return 0;
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if (abs_timeout)
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memcpy(p, abs_timeout, sizeof(struct timespec));
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else
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memset(p, 0, sizeof(struct timespec));
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if (likely(!context))
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return 0;
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context->mq_sendrecv.mqdes = mqdes;
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context->mq_sendrecv.msg_len = msg_len;
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context->mq_sendrecv.msg_prio = msg_prio;
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ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
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if (!ax)
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return -ENOMEM;
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if (u_abs_timeout != NULL) {
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if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) {
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kfree(ax);
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return -EFAULT;
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}
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} else
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memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout));
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ax->mqdes = mqdes;
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ax->msg_len = msg_len;
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ax->msg_prio = msg_prio;
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ax->d.type = AUDIT_MQ_SENDRECV;
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ax->d.next = context->aux;
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context->aux = (void *)ax;
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return 0;
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}
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/**
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* __audit_mq_timedreceive - record audit data for a POSIX MQ timed receive
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* @mqdes: MQ descriptor
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* @msg_len: Message length
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* @u_msg_prio: Message priority
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* @u_abs_timeout: Message timeout in absolute time
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*
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* Returns 0 for success or NULL context or < 0 on error.
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*/
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int __audit_mq_timedreceive(mqd_t mqdes, size_t msg_len,
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unsigned int __user *u_msg_prio,
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const struct timespec __user *u_abs_timeout)
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{
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struct audit_aux_data_mq_sendrecv *ax;
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struct audit_context *context = current->audit_context;
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if (!audit_enabled)
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return 0;
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if (likely(!context))
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return 0;
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ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
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if (!ax)
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return -ENOMEM;
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if (u_msg_prio != NULL) {
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if (get_user(ax->msg_prio, u_msg_prio)) {
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kfree(ax);
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return -EFAULT;
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}
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} else
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ax->msg_prio = 0;
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if (u_abs_timeout != NULL) {
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if (copy_from_user(&ax->abs_timeout, u_abs_timeout, sizeof(ax->abs_timeout))) {
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kfree(ax);
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return -EFAULT;
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}
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} else
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memset(&ax->abs_timeout, 0, sizeof(ax->abs_timeout));
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ax->mqdes = mqdes;
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ax->msg_len = msg_len;
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ax->d.type = AUDIT_MQ_SENDRECV;
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ax->d.next = context->aux;
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context->aux = (void *)ax;
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return 0;
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context->type = AUDIT_MQ_SENDRECV;
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}
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/**
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