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From: Miklos Szeredi <mszeredi@redhat.com>
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Date: Mon, 27 Jan 2020 19:01:49 +0000
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Subject: [PATCH] virtiofsd: fail when parent inode isn't known in
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lo_do_lookup()
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The Linux file handle APIs (struct export_operations) can access inodes
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that are not attached to parents because path name traversal is not
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performed. Refuse if there is no parent in lo_do_lookup().
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Also clean up lo_do_lookup() while we're here.
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Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit 9de4fab5995d115f8ebfb41d8d94a866d80a1708)
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---
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tools/virtiofsd/passthrough_ll.c | 14 ++++++++++++--
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1 file changed, 12 insertions(+), 2 deletions(-)
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diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
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index de12e75a9e..33bfb4d1f4 100644
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--- a/tools/virtiofsd/passthrough_ll.c
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+++ b/tools/virtiofsd/passthrough_ll.c
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@@ -777,6 +777,15 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
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struct lo_data *lo = lo_data(req);
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struct lo_inode *inode, *dir = lo_inode(req, parent);
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+ /*
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+ * name_to_handle_at() and open_by_handle_at() can reach here with fuse
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+ * mount point in guest, but we don't have its inode info in the
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+ * ino_map.
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+ */
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+ if (!dir) {
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+ return ENOENT;
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+ }
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+
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memset(e, 0, sizeof(*e));
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e->attr_timeout = lo->timeout;
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e->entry_timeout = lo->timeout;
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@@ -786,7 +795,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
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name = ".";
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}
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- newfd = openat(lo_fd(req, parent), name, O_PATH | O_NOFOLLOW);
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+ newfd = openat(dir->fd, name, O_PATH | O_NOFOLLOW);
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if (newfd == -1) {
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goto out_err;
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}
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@@ -796,7 +805,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
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goto out_err;
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}
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- inode = lo_find(lo_data(req), &e->attr);
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+ inode = lo_find(lo, &e->attr);
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if (inode) {
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close(newfd);
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newfd = -1;
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@@ -812,6 +821,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t parent, const char *name,
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inode->is_symlink = S_ISLNK(e->attr.st_mode);
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inode->refcount = 1;
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inode->fd = newfd;
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+ newfd = -1;
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inode->ino = e->attr.st_ino;
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inode->dev = e->attr.st_dev;
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