diff options
| author | Amir Goldstein <amir73il@gmail.com> | 2020-07-13 17:19:43 +0300 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2020-07-16 00:11:15 +0200 |
| commit | 470c15636125d1591bc901f6aa2d8e4a60ed2190 (patch) | |
| tree | e3f64b6e6167e7bf9f5e2483b404933b5385bd1e /fs/overlayfs | |
| parent | a888db310195400f050b89c47673f0f8babfbb41 (diff) | |
| download | lwn-470c15636125d1591bc901f6aa2d8e4a60ed2190.tar.gz lwn-470c15636125d1591bc901f6aa2d8e4a60ed2190.zip | |
ovl: force read-only sb on failure to create index dir
With index feature enabled, on failure to create index dir, overlay is
being mounted read-only. However, we do not forbid user to remount overlay
read-write. Fix that by setting ofs->workdir to NULL, which prevents
remount read-write.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs')
| -rw-r--r-- | fs/overlayfs/super.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 94ca095b2a9e..f41ef1dd384c 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -1352,12 +1352,13 @@ static int ovl_get_indexdir(struct super_block *sb, struct ovl_fs *ofs, goto out; } + /* index dir will act also as workdir */ + iput(ofs->workdir_trap); + ofs->workdir_trap = NULL; + dput(ofs->workdir); + ofs->workdir = NULL; ofs->indexdir = ovl_workdir_create(ofs, OVL_INDEXDIR_NAME, true); if (ofs->indexdir) { - /* index dir will act also as workdir */ - iput(ofs->workdir_trap); - ofs->workdir_trap = NULL; - dput(ofs->workdir); ofs->workdir = dget(ofs->indexdir); err = ovl_setup_trap(sb, ofs->indexdir, &ofs->indexdir_trap, @@ -1869,7 +1870,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) if (!ovl_upper_mnt(ofs)) sb->s_flags |= SB_RDONLY; - if (!(ovl_force_readonly(ofs)) && ofs->config.index) { + if (!ovl_force_readonly(ofs) && ofs->config.index) { err = ovl_get_indexdir(sb, ofs, oe, &upperpath); if (err) goto out_free_oe; |