When linking a file with copy up origin into a new parent, mark the
new parent dir "impure".
Fixes: ee1d6d37b6b8 ("ovl: mark upper dir with type origin entries "impure"")
Cc: <stable@xxxxxxxxxxxxxxx> # v4.12
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/overlayfs/copy_up.c | 4 ++--
fs/overlayfs/dir.c | 20 ++++++++++++++++----
fs/overlayfs/overlayfs.h | 2 +-
fs/overlayfs/util.c | 6 +++---
4 files changed, 22 insertions(+), 10 deletions(-)
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index acb6f97deb97..aeb22def9f80 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -338,7 +338,7 @@ static int ovl_link_up(struct ovl_copy_up_ctx *c)
struct inode *udir = d_inode(upperdir);
/* Mark parent "impure" because it may now contain non-pure upper */
- err = ovl_set_impure(c->parent, upperdir);
+ err = ovl_set_impure(c->parent);
if (err)
return err;
@@ -551,7 +551,7 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
* Mark parent "impure" because it may now contain non-pure
* upper
*/
- err = ovl_set_impure(c->parent, c->destdir);
+ err = ovl_set_impure(c->parent);
if (err)
return err;
}
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 641d9ee97f91..5df99952feba 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -92,7 +92,8 @@ int ovl_create_real(struct inode *dir, struct dentry *newdentry,
return -ESTALE;
if (hardlink) {
- err = ovl_do_link(hardlink, dir, newdentry, debug);
+ err = ovl_do_link(ovl_dentry_upper(hardlink), dir, newdentry,
+ debug);
} else {
switch (attr->mode & S_IFMT) {
case S_IFREG:
@@ -492,6 +493,17 @@ static int ovl_create_or_link(struct dentry *dentry, struct inode *inode,
return err;
old_cred = ovl_override_creds(dentry->d_sb);
+
+ /*
+ * When linking a file with copy up origin into a new parent, mark the
+ * new parent dir "impure".
+ */
+ if (hardlink && ovl_type_origin(hardlink)) {
+ err = ovl_set_impure(dentry->d_parent);
+ if (err)
+ goto out_revert_creds;
+ }
+
err = -ENOMEM;
override_cred = prepare_creds();
if (override_cred) {
@@ -609,7 +621,7 @@ static int ovl_link(struct dentry *old, struct inode *newdir,
inode = d_inode(old);
ihold(inode);
- err = ovl_create_or_link(new, inode, NULL, ovl_dentry_upper(old));
+ err = ovl_create_or_link(new, inode, NULL, old);
if (err)
iput(inode);
@@ -987,12 +999,12 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
* lookup the origin inodes of the entries to fill d_ino.
*/
if (ovl_type_origin(old)) {
- err = ovl_set_impure(new->d_parent, new_upperdir);
+ err = ovl_set_impure(new->d_parent);
if (err)
goto out_revert_creds;
}
if (!overwrite && ovl_type_origin(new)) {
- err = ovl_set_impure(old->d_parent, old_upperdir);
+ err = ovl_set_impure(old->d_parent);
if (err)
goto out_revert_creds;
}
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 60d26605e039..7aa1c48390a5 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -225,7 +225,7 @@ bool ovl_check_dir_xattr(struct dentry *dentry, const char *name);
int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry,
const char *name, const void *value, size_t size,
int xerr);
-int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry);
+int ovl_set_impure(struct dentry *dentry);
void ovl_set_flag(unsigned long flag, struct inode *inode);
bool ovl_test_flag(unsigned long flag, struct inode *inode);
bool ovl_inuse_trylock(struct dentry *dentry);
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index c492ba75c659..82c3dad6ddf4 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -353,7 +353,7 @@ int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry,
return err;
}
-int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry)
+int ovl_set_impure(struct dentry *dentry)
{
int err;
@@ -364,8 +364,8 @@ int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry)
* Do not fail when upper doesn't support xattrs.
* Upper inodes won't have origin nor redirect xattr anyway.
*/
- err = ovl_check_setxattr(dentry, upperdentry, OVL_XATTR_IMPURE,
- "y", 1, 0);
+ err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry),
+ OVL_XATTR_IMPURE, "y", 1, 0);
if (!err)
ovl_set_flag(OVL_IMPURE, d_inode(dentry));
--
2.7.4
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