int open_detach_mount(char *dir) { int fd, ret; fd = __sys(open)(dir, O_RDONLY | O_DIRECTORY, 0); if (fd < 0) __pr_perror("Can't open directory %s: %d", dir, fd); ret = __sys(umount2)(dir, MNT_DETACH); if (ret) { __pr_perror("Can't detach mount %s: %d", dir, ret); goto err_close; } ret = __sys(rmdir)(dir); if (ret) { __pr_perror("Can't remove tmp dir %s: %d", dir, ret); goto err_close; } return fd; err_close: if (fd >= 0) __sys(close)(fd); return -1; }
int recv_fds(int sock, int *fds, int nr_fds, struct fd_opts *opts) { struct scm_fdset fdset; struct cmsghdr *cmsg; int *cmsg_data; int ret; int i, min_fd; cmsg_data = scm_fdset_init(&fdset, NULL, 0, opts != NULL); for (i = 0; i < nr_fds; i += min_fd) { min_fd = min(CR_SCM_MAX_FD, nr_fds - i); scm_fdset_init_chunk(&fdset, min_fd, opts != NULL); ret = __sys(recvmsg)(sock, &fdset.hdr, 0); if (ret <= 0) return ret ? : -1; cmsg = CMSG_FIRSTHDR(&fdset.hdr); if (!cmsg || cmsg->cmsg_type != SCM_RIGHTS) return -EINVAL; if (fdset.hdr.msg_flags & MSG_CTRUNC) return -ENFILE; min_fd = (cmsg->cmsg_len - sizeof(struct cmsghdr)) / sizeof(int); /* * In case if kernel screwed the recipient, most probably * the caller stack frame will be overwriten, just scream * and exit. * * FIXME Need to sanitize util.h to be able to include it * into files which do not have glibc and a couple of * sys_write_ helpers. Meawhile opencoded BUG_ON here. */ BUG_ON(min_fd > CR_SCM_MAX_FD); if (unlikely(min_fd <= 0)) return -1; __memcpy(&fds[i], cmsg_data, sizeof(int) * min_fd); #ifdef SCM_FDSET_HAS_OPTS if (opts) __memcpy(opts + i, fdset.opts, sizeof(struct fd_opts) * min_fd); #endif } return 0; }
int fds_send_via(int sock, int *fds, int nr_fds) { struct scm_fdset fdset; int i, min_fd, ret; int *cmsg_data; cmsg_data = scm_fdset_init(&fdset); for (i = 0; i < nr_fds; i += min_fd) { min_fd = min(CR_SCM_MAX_FD, nr_fds - i); scm_fdset_init_chunk(&fdset, min_fd); __std(memcpy(cmsg_data, &fds[i], sizeof(int) * min_fd)); ret = __sys(sendmsg(sock, &fdset.hdr, 0)); if (ret <= 0) return ret ? : -1; } return 0; }
int fds_recv_via(int sock, int *fds, int nr_fds) { struct scm_fdset fdset; struct cmsghdr *cmsg; int *cmsg_data; int ret; int i, min_fd; cmsg_data = scm_fdset_init(&fdset); for (i = 0; i < nr_fds; i += min_fd) { min_fd = min(CR_SCM_MAX_FD, nr_fds - i); scm_fdset_init_chunk(&fdset, min_fd); ret = __sys(recvmsg(sock, &fdset.hdr, 0)); if (ret <= 0) return ret ? : -1; cmsg = CMSG_FIRSTHDR(&fdset.hdr); if (!cmsg || cmsg->cmsg_type != SCM_RIGHTS) return -1; if (fdset.hdr.msg_flags & MSG_CTRUNC) return -2; min_fd = (cmsg->cmsg_len - sizeof(struct cmsghdr)) / sizeof(int); /* * In case if kernel screwed the recepient, most probably * the caller stack frame will be overwriten, just scream * and exit. */ if (unlikely(min_fd > CR_SCM_MAX_FD)) *(volatile unsigned long *)NULL = 0xdead0000 + __LINE__; if (unlikely(min_fd <= 0)) return -1; __std(memcpy(&fds[i], cmsg_data, sizeof(int) * min_fd)); } return 0; }
int send_fds(int sock, struct sockaddr_un *saddr, int len, int *fds, int nr_fds, void *data, unsigned ch_size) { struct scm_fdset fdset; int *cmsg_data; int i, min_fd, ret; cmsg_data = scm_fdset_init(&fdset, saddr, len); for (i = 0; i < nr_fds; i += min_fd) { min_fd = min(CR_SCM_MAX_FD, nr_fds - i); scm_fdset_init_chunk(&fdset, min_fd, data, ch_size); __memcpy(cmsg_data, &fds[i], sizeof(int) * min_fd); ret = __sys(sendmsg)(sock, &fdset.hdr, 0); if (ret <= 0) return ret ? : -1; if (data) data += min_fd * ch_size; } return 0; }
int send_fds(int sock, struct sockaddr_un *saddr, int len, int *fds, int nr_fds, bool with_flags) { struct scm_fdset fdset; int *cmsg_data; int i, min_fd, ret; cmsg_data = scm_fdset_init(&fdset, saddr, len, with_flags); for (i = 0; i < nr_fds; i += min_fd) { min_fd = min(CR_SCM_MAX_FD, nr_fds - i); scm_fdset_init_chunk(&fdset, min_fd, with_flags); __memcpy(cmsg_data, &fds[i], sizeof(int) * min_fd); #ifdef SCM_FDSET_HAS_OPTS if (with_flags) { int j; for (j = 0; j < min_fd; j++) { int flags, fd = fds[i + j]; struct fd_opts *p = fdset.opts + j; struct f_owner_ex owner_ex; uint32_t v[2]; flags = __sys(fcntl)(fd, F_GETFD, 0); if (flags < 0) { pr_err("fcntl(%d, F_GETFD) -> %d\n", fd, flags); return -1; } p->flags = (char)flags; ret = __sys(fcntl)(fd, F_GETOWN_EX, (long)&owner_ex); if (ret) { pr_err("fcntl(%d, F_GETOWN_EX) -> %d\n", fd, ret); return -1; } /* * Simple case -- nothing is changed. */ if (owner_ex.pid == 0) { p->fown.pid = 0; continue; } ret = __sys(fcntl)(fd, F_GETOWNER_UIDS, (long)&v); if (ret) { pr_err("fcntl(%d, F_GETOWNER_UIDS) -> %d\n", fd, ret); return -1; } p->fown.uid = v[0]; p->fown.euid = v[1]; p->fown.pid_type = owner_ex.type; p->fown.pid = owner_ex.pid; } } #endif ret = __sys(sendmsg)(sock, &fdset.hdr, 0); if (ret <= 0) return ret ? : -1; } return 0; }