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https://gitlab.com/qemu-project/qemu
synced 2024-09-06 09:55:55 +00:00
virtiofsd: passthrough_ll: add fd_map to hide file descriptors
Do not expose file descriptor numbers to clients. This prevents the abuse of internal file descriptors (like stdin/stdout). Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Fix from: Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com> dgilbert: Added lseek Reviewed-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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@ -60,6 +60,7 @@ struct lo_map_elem {
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union {
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struct lo_inode *inode;
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struct lo_dirp *dirp;
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int fd;
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ssize_t freelist;
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};
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bool in_use;
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@ -107,6 +108,7 @@ struct lo_data {
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struct lo_inode root; /* protected by lo->mutex */
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struct lo_map ino_map; /* protected by lo->mutex */
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struct lo_map dirp_map; /* protected by lo->mutex */
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struct lo_map fd_map; /* protected by lo->mutex */
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};
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static const struct fuse_opt lo_opts[] = {
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@ -236,6 +238,20 @@ static void lo_map_remove(struct lo_map *map, size_t key)
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map->freelist = key;
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}
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/* Assumes lo->mutex is held */
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static ssize_t lo_add_fd_mapping(fuse_req_t req, int fd)
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{
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struct lo_map_elem *elem;
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elem = lo_map_alloc_elem(&lo_data(req)->fd_map);
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if (!elem) {
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return -1;
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}
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elem->fd = fd;
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return elem - lo_data(req)->fd_map.elems;
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}
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/* Assumes lo->mutex is held */
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static ssize_t lo_add_dirp_mapping(fuse_req_t req, struct lo_dirp *dirp)
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{
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@ -350,6 +366,22 @@ static int utimensat_empty_nofollow(struct lo_inode *inode,
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return utimensat(AT_FDCWD, procname, tv, 0);
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}
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static int lo_fi_fd(fuse_req_t req, struct fuse_file_info *fi)
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{
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struct lo_data *lo = lo_data(req);
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struct lo_map_elem *elem;
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pthread_mutex_lock(&lo->mutex);
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elem = lo_map_get(&lo->fd_map, fi->fh);
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pthread_mutex_unlock(&lo->mutex);
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if (!elem) {
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return -1;
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}
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return elem->fd;
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}
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static void lo_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
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int valid, struct fuse_file_info *fi)
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{
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@ -358,6 +390,7 @@ static void lo_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
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struct lo_inode *inode;
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int ifd;
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int res;
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int fd;
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inode = lo_inode(req, ino);
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if (!inode) {
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@ -367,9 +400,14 @@ static void lo_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
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ifd = inode->fd;
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/* If fi->fh is invalid we'll report EBADF later */
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if (fi) {
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fd = lo_fi_fd(req, fi);
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}
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if (valid & FUSE_SET_ATTR_MODE) {
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if (fi) {
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res = fchmod(fi->fh, attr->st_mode);
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res = fchmod(fd, attr->st_mode);
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} else {
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sprintf(procname, "/proc/self/fd/%i", ifd);
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res = chmod(procname, attr->st_mode);
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@ -389,7 +427,7 @@ static void lo_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
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}
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if (valid & FUSE_SET_ATTR_SIZE) {
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if (fi) {
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res = ftruncate(fi->fh, attr->st_size);
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res = ftruncate(fd, attr->st_size);
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} else {
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sprintf(procname, "/proc/self/fd/%i", ifd);
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res = truncate(procname, attr->st_size);
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@ -419,7 +457,7 @@ static void lo_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
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}
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if (fi) {
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res = futimens(fi->fh, tv);
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res = futimens(fd, tv);
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} else {
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res = utimensat_empty_nofollow(inode, tv);
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}
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@ -1096,7 +1134,18 @@ static void lo_create(fuse_req_t req, fuse_ino_t parent, const char *name,
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lo_restore_cred(&old);
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if (!err) {
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fi->fh = fd;
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ssize_t fh;
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pthread_mutex_lock(&lo->mutex);
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fh = lo_add_fd_mapping(req, fd);
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pthread_mutex_unlock(&lo->mutex);
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if (fh == -1) {
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close(fd);
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fuse_reply_err(req, ENOMEM);
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return;
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}
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fi->fh = fh;
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err = lo_do_lookup(req, parent, name, &e);
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}
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if (lo->cache == CACHE_NEVER) {
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@ -1140,6 +1189,7 @@ static void lo_fsyncdir(fuse_req_t req, fuse_ino_t ino, int datasync,
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static void lo_open(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
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{
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int fd;
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ssize_t fh;
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char buf[64];
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struct lo_data *lo = lo_data(req);
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@ -1175,7 +1225,16 @@ static void lo_open(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
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return (void)fuse_reply_err(req, errno);
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}
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fi->fh = fd;
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pthread_mutex_lock(&lo->mutex);
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fh = lo_add_fd_mapping(req, fd);
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pthread_mutex_unlock(&lo->mutex);
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if (fh == -1) {
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close(fd);
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fuse_reply_err(req, ENOMEM);
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return;
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}
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fi->fh = fh;
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if (lo->cache == CACHE_NEVER) {
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fi->direct_io = 1;
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} else if (lo->cache == CACHE_ALWAYS) {
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@ -1187,9 +1246,18 @@ static void lo_open(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
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static void lo_release(fuse_req_t req, fuse_ino_t ino,
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struct fuse_file_info *fi)
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{
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struct lo_data *lo = lo_data(req);
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int fd;
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(void)ino;
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close(fi->fh);
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fd = lo_fi_fd(req, fi);
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pthread_mutex_lock(&lo->mutex);
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lo_map_remove(&lo->fd_map, fi->fh);
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pthread_mutex_unlock(&lo->mutex);
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close(fd);
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fuse_reply_err(req, 0);
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}
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@ -1197,7 +1265,7 @@ static void lo_flush(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi)
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{
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int res;
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(void)ino;
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res = close(dup(fi->fh));
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res = close(dup(lo_fi_fd(req, fi)));
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fuse_reply_err(req, res == -1 ? errno : 0);
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}
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@ -1224,7 +1292,7 @@ static void lo_fsync(fuse_req_t req, fuse_ino_t ino, int datasync,
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return (void)fuse_reply_err(req, errno);
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}
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} else {
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fd = fi->fh;
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fd = lo_fi_fd(req, fi);
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}
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if (datasync) {
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@ -1251,7 +1319,7 @@ static void lo_read(fuse_req_t req, fuse_ino_t ino, size_t size, off_t offset,
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}
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buf.buf[0].flags = FUSE_BUF_IS_FD | FUSE_BUF_FD_SEEK;
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buf.buf[0].fd = fi->fh;
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buf.buf[0].fd = lo_fi_fd(req, fi);
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buf.buf[0].pos = offset;
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fuse_reply_data(req, &buf);
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@ -1266,7 +1334,7 @@ static void lo_write_buf(fuse_req_t req, fuse_ino_t ino,
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struct fuse_bufvec out_buf = FUSE_BUFVEC_INIT(fuse_buf_size(in_buf));
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out_buf.buf[0].flags = FUSE_BUF_IS_FD | FUSE_BUF_FD_SEEK;
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out_buf.buf[0].fd = fi->fh;
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out_buf.buf[0].fd = lo_fi_fd(req, fi);
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out_buf.buf[0].pos = off;
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if (lo_debug(req)) {
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@ -1303,7 +1371,7 @@ static void lo_fallocate(fuse_req_t req, fuse_ino_t ino, int mode, off_t offset,
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(void)ino;
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#ifdef CONFIG_FALLOCATE
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err = fallocate(fi->fh, mode, offset, length);
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err = fallocate(lo_fi_fd(req, fi), mode, offset, length);
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if (err < 0) {
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err = errno;
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}
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@ -1314,7 +1382,7 @@ static void lo_fallocate(fuse_req_t req, fuse_ino_t ino, int mode, off_t offset,
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return;
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}
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err = posix_fallocate(fi->fh, offset, length);
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err = posix_fallocate(lo_fi_fd(req, fi), offset, length);
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#endif
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fuse_reply_err(req, err);
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@ -1326,7 +1394,7 @@ static void lo_flock(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi,
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int res;
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(void)ino;
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res = flock(fi->fh, op);
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res = flock(lo_fi_fd(req, fi), op);
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fuse_reply_err(req, res == -1 ? errno : 0);
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}
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@ -1551,17 +1619,19 @@ static void lo_copy_file_range(fuse_req_t req, fuse_ino_t ino_in, off_t off_in,
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off_t off_out, struct fuse_file_info *fi_out,
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size_t len, int flags)
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{
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int in_fd, out_fd;
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ssize_t res;
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if (lo_debug(req))
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fuse_log(FUSE_LOG_DEBUG,
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"lo_copy_file_range(ino=%" PRIu64 "/fd=%lu, "
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"off=%lu, ino=%" PRIu64 "/fd=%lu, "
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"off=%lu, size=%zd, flags=0x%x)\n",
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ino_in, fi_in->fh, off_in, ino_out, fi_out->fh, off_out, len,
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flags);
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in_fd = lo_fi_fd(req, fi_in);
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out_fd = lo_fi_fd(req, fi_out);
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res = copy_file_range(fi_in->fh, &off_in, fi_out->fh, &off_out, len, flags);
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fuse_log(FUSE_LOG_DEBUG,
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"lo_copy_file_range(ino=%" PRIu64 "/fd=%d, "
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"off=%lu, ino=%" PRIu64 "/fd=%d, "
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"off=%lu, size=%zd, flags=0x%x)\n",
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ino_in, in_fd, off_in, ino_out, out_fd, off_out, len, flags);
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res = copy_file_range(in_fd, &off_in, out_fd, &off_out, len, flags);
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if (res < 0) {
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fuse_reply_err(req, -errno);
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} else {
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@ -1576,7 +1646,7 @@ static void lo_lseek(fuse_req_t req, fuse_ino_t ino, off_t off, int whence,
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off_t res;
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(void)ino;
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res = lseek(fi->fh, off, whence);
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res = lseek(lo_fi_fd(req, fi), off, whence);
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if (res != -1) {
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fuse_reply_lseek(req, res);
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} else {
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@ -1661,6 +1731,7 @@ int main(int argc, char *argv[])
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root_elem->inode = &lo.root;
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lo_map_init(&lo.dirp_map);
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lo_map_init(&lo.fd_map);
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if (fuse_parse_cmdline(&args, &opts) != 0) {
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return 1;
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@ -1758,6 +1829,7 @@ err_out2:
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err_out1:
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fuse_opt_free_args(&args);
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lo_map_destroy(&lo.fd_map);
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lo_map_destroy(&lo.dirp_map);
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lo_map_destroy(&lo.ino_map);
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