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| author | Christian Brauner <brauner@kernel.org> | 2022-04-04 12:51:52 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2022-04-28 16:31:12 +0200 |
| commit | ba9ea771ec8a9da4e3aa5cb8c8549fc3b15b2641 (patch) | |
| tree | 8a7b2992a7a56db470f2ce201630fd4be96eecb6 /fs/overlayfs/namei.c | |
| parent | 50db8d0273551f8792b4d9367d43a0093fb4512d (diff) | |
| download | linux-stable-ba9ea771ec8a9da4e3aa5cb8c8549fc3b15b2641.tar.gz linux-stable-ba9ea771ec8a9da4e3aa5cb8c8549fc3b15b2641.tar.bz2 linux-stable-ba9ea771ec8a9da4e3aa5cb8c8549fc3b15b2641.zip | |
ovl: handle idmappings for layer lookup
Make the two places where lookup helpers can be called either on lower
or upper layers take the mount's idmapping into account. To this end we
pass down the mount in struct ovl_lookup_data. It can later also be used
to construct struct path for various other helpers. This is needed to
support idmapped base layers with overlay.
Cc: <linux-unionfs@vger.kernel.org>
Tested-by: Giuseppe Scrivano <gscrivan@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/namei.c')
| -rw-r--r-- | fs/overlayfs/namei.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c index 0bd7ce41d848..65c4346a5b43 100644 --- a/fs/overlayfs/namei.c +++ b/fs/overlayfs/namei.c @@ -199,11 +199,12 @@ static bool ovl_is_opaquedir(struct ovl_fs *ofs, struct path *path) return ovl_path_check_dir_xattr(ofs, path, OVL_XATTR_OPAQUE); } -static struct dentry *ovl_lookup_positive_unlocked(const char *name, +static struct dentry *ovl_lookup_positive_unlocked(struct ovl_lookup_data *d, + const char *name, struct dentry *base, int len, bool drop_negative) { - struct dentry *ret = lookup_one_len_unlocked(name, base, len); + struct dentry *ret = lookup_one_unlocked(mnt_user_ns(d->mnt), name, base, len); if (!IS_ERR(ret) && d_flags_negative(smp_load_acquire(&ret->d_flags))) { if (drop_negative && ret->d_lockref.count == 1) { @@ -229,7 +230,7 @@ static int ovl_lookup_single(struct dentry *base, struct ovl_lookup_data *d, int err; bool last_element = !post[0]; - this = ovl_lookup_positive_unlocked(name, base, namelen, drop_negative); + this = ovl_lookup_positive_unlocked(d, name, base, namelen, drop_negative); if (IS_ERR(this)) { err = PTR_ERR(this); this = NULL; @@ -709,7 +710,8 @@ struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper, if (err) return ERR_PTR(err); - index = lookup_positive_unlocked(name.name, ofs->indexdir, name.len); + index = lookup_one_positive_unlocked(ovl_upper_mnt_userns(ofs), name.name, + ofs->indexdir, name.len); if (IS_ERR(index)) { err = PTR_ERR(index); if (err == -ENOENT) { @@ -1174,8 +1176,8 @@ bool ovl_lower_positive(struct dentry *dentry) struct dentry *this; struct dentry *lowerdir = poe->lowerstack[i].dentry; - this = lookup_positive_unlocked(name->name, lowerdir, - name->len); + this = lookup_one_positive_unlocked(mnt_user_ns(poe->lowerstack[i].layer->mnt), + name->name, lowerdir, name->len); if (IS_ERR(this)) { switch (PTR_ERR(this)) { case -ENOENT: |