cregit-Linux how code gets into the kernel

Release 4.11 ipc/compat_mq.c

Directory: ipc
 *  ipc/compat_mq.c
 *    32 bit emulation for POSIX message queue system calls
 *    Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author: Arnd Bergmann <>

#include <linux/compat.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/mqueue.h>
#include <linux/syscalls.h>

#include <linux/uaccess.h>

struct compat_mq_attr {
compat_long_t mq_flags;      /* message queue flags               */
compat_long_t mq_maxmsg;     /* maximum number of messages        */
compat_long_t mq_msgsize;    /* maximum message size              */
compat_long_t mq_curmsgs;    /* number of messages currently queued  */
compat_long_t __reserved[4]; /* ignored for input, zeroed for output */

static inline int get_compat_mq_attr(struct mq_attr *attr, const struct compat_mq_attr __user *uattr) { if (!access_ok(VERIFY_READ, uattr, sizeof *uattr)) return -EFAULT; return __get_user(attr->mq_flags, &uattr->mq_flags) | __get_user(attr->mq_maxmsg, &uattr->mq_maxmsg) | __get_user(attr->mq_msgsize, &uattr->mq_msgsize) | __get_user(attr->mq_curmsgs, &uattr->mq_curmsgs); }


Andrew Morton8497.67%150.00%
Jesper Juhl22.33%150.00%

static inline int put_compat_mq_attr(const struct mq_attr *attr, struct compat_mq_attr __user *uattr) { if (clear_user(uattr, sizeof *uattr)) return -EFAULT; return __put_user(attr->mq_flags, &uattr->mq_flags) | __put_user(attr->mq_maxmsg, &uattr->mq_maxmsg) | __put_user(attr->mq_msgsize, &uattr->mq_msgsize) | __put_user(attr->mq_curmsgs, &uattr->mq_curmsgs); }


Andrew Morton83100.00%1100.00%

COMPAT_SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, compat_mode_t, mode, struct compat_mq_attr __user *, u_attr) { void __user *p = NULL; if (u_attr && oflag & O_CREAT) { struct mq_attr attr; memset(&attr, 0, sizeof(attr)); p = compat_alloc_user_space(sizeof(attr)); if (get_compat_mq_attr(&attr, u_attr) || copy_to_user(p, &attr, sizeof(attr))) return -EFAULT; } return sys_mq_open(u_name, oflag, mode, p); } COMPAT_SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr, compat_size_t, msg_len, unsigned int, msg_prio, const struct compat_timespec __user *, u_abs_timeout) { struct timespec __user *u_ts; if (compat_convert_timespec(&u_ts, u_abs_timeout)) return -EFAULT; return sys_mq_timedsend(mqdes, u_msg_ptr, msg_len, msg_prio, u_ts); } COMPAT_SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr, compat_size_t, msg_len, unsigned int __user *, u_msg_prio, const struct compat_timespec __user *, u_abs_timeout) { struct timespec __user *u_ts; if (compat_convert_timespec(&u_ts, u_abs_timeout)) return -EFAULT; return sys_mq_timedreceive(mqdes, u_msg_ptr, msg_len, u_msg_prio, u_ts); } COMPAT_SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, const struct compat_sigevent __user *, u_notification) { struct sigevent __user *p = NULL; if (u_notification) { struct sigevent n; p = compat_alloc_user_space(sizeof(*p)); if (get_compat_sigevent(&n, u_notification)) return -EFAULT; if (n.sigev_notify == SIGEV_THREAD) n.sigev_value.sival_ptr = compat_ptr(n.sigev_value.sival_int); if (copy_to_user(p, &n, sizeof(*p))) return -EFAULT; } return sys_mq_notify(mqdes, p); } COMPAT_SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, const struct compat_mq_attr __user *, u_mqstat, struct compat_mq_attr __user *, u_omqstat) { struct mq_attr mqstat; struct mq_attr __user *p = compat_alloc_user_space(2 * sizeof(*p)); long ret; memset(&mqstat, 0, sizeof(mqstat)); if (u_mqstat) { if (get_compat_mq_attr(&mqstat, u_mqstat) || copy_to_user(p, &mqstat, sizeof(mqstat))) return -EFAULT; } ret = sys_mq_getsetattr(mqdes, u_mqstat ? p : NULL, u_omqstat ? p + 1 : NULL); if (ret) return ret; if (u_omqstat) { if (copy_from_user(&mqstat, p + 1, sizeof(mqstat)) || put_compat_mq_attr(&mqstat, u_omqstat)) return -EFAULT; } return 0; }

Overall Contributors

Andrew Morton42560.46%111.11%
Al Viro15121.48%222.22%
Heiko Carstens9613.66%222.22%
Dan Rosenberg263.70%111.11%
Jesper Juhl20.28%111.11%
H. Peter Anvin20.28%111.11%
Paul McQuade10.14%111.11%
Directory: ipc
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.