Date: Wed, 20 Oct 2021 00:53:42 GMT From: Mark Johnston <markj@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 348fc38fd539 - stable/13 - mount: Check for !VDIR mount points before handling -o emptydir Message-ID: <202110200053.19K0rgMr055160@gitrepo.freebsd.org>
next in thread | raw e-mail | index | archive | help
The branch stable/13 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=348fc38fd53920cce82175f90b13765258cee027 commit 348fc38fd53920cce82175f90b13765258cee027 Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2021-10-13 00:11:02 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2021-10-20 00:53:33 +0000 mount: Check for !VDIR mount points before handling -o emptydir To implement -o emptydir, vfs_emptydir() checks that the passed directory is empty. This should be done after checking whether the vnode is of type VDIR, though, or vfs_emptydir() may end up calling VOP_READDIR on a non-directory. Reported by: syzbot+4006732c69fb0f792b2c@syzkaller.appspotmail.com Reviewed by: kib, imp Sponsored by: The FreeBSD Foundation (cherry picked from commit 03d5820f738de130b2feb66833f18741b7f92a14) --- sys/kern/vfs_mount.c | 10 ++-------- sys/kern/vfs_subr.c | 1 + 2 files changed, 3 insertions(+), 8 deletions(-) diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c index 09c9a59d1bed..c10c24f4501b 100644 --- a/sys/kern/vfs_mount.c +++ b/sys/kern/vfs_mount.c @@ -946,14 +946,6 @@ vfs_domount_first( ASSERT_VOP_ELOCKED(vp, __func__); KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); - if ((fsflags & MNT_EMPTYDIR) != 0) { - error = vfs_emptydir(vp); - if (error != 0) { - vput(vp); - return (error); - } - } - /* * If the jail of the calling thread lacks permission for this type of * file system, or is trying to cover its own root, deny immediately. @@ -975,6 +967,8 @@ vfs_domount_first( error = vinvalbuf(vp, V_SAVE, 0, 0); if (error == 0 && vp->v_type != VDIR) error = ENOTDIR; + if (error == 0 && (fsflags & MNT_EMPTYDIR) != 0) + error = vfs_emptydir(vp); if (error == 0) { VI_LOCK(vp); if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c index 9d0638d1bf38..76e01d1f7816 100644 --- a/sys/kern/vfs_subr.c +++ b/sys/kern/vfs_subr.c @@ -6276,6 +6276,7 @@ vfs_emptydir(struct vnode *vp) eof = 0; ASSERT_VOP_LOCKED(vp, "vfs_emptydir"); + VNASSERT(vp->v_type == VDIR, vp, ("vp is not a directory")); dirent = malloc(sizeof(struct dirent), M_TEMP, M_WAITOK); iov.iov_base = dirent;
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?202110200053.19K0rgMr055160>