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-rw-r--r--fs/overlayfs/copy_up.c12
-rw-r--r--fs/overlayfs/dir.c56
-rw-r--r--fs/overlayfs/overlayfs.h7
-rw-r--r--fs/overlayfs/super.c9
4 files changed, 45 insertions, 39 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index e8cacf7a8dcc..0e9940f9f34a 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -238,10 +238,15 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
struct inode *udir = upperdir->d_inode;
struct dentry *newdentry = NULL;
struct dentry *upper = NULL;
- umode_t mode = stat->mode;
int err;
const struct cred *old_creds = NULL;
struct cred *new_creds = NULL;
+ struct cattr cattr = {
+ /* Can't properly set mode on creation because of the umask */
+ .mode = stat->mode & S_IFMT,
+ .rdev = stat->rdev,
+ .link = link
+ };
newdentry = ovl_lookup_temp(workdir, dentry);
err = PTR_ERR(newdentry);
@@ -261,10 +266,7 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
if (new_creds)
old_creds = override_creds(new_creds);
- /* Can't properly set mode on creation because of the umask */
- stat->mode &= S_IFMT;
- err = ovl_create_real(wdir, newdentry, stat, link, NULL, true);
- stat->mode = mode;
+ err = ovl_create_real(wdir, newdentry, &cattr, NULL, true);
if (new_creds) {
revert_creds(old_creds);
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 3cc65e60df02..16e06dd89457 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -82,8 +82,7 @@ static struct dentry *ovl_whiteout(struct dentry *workdir,
}
int ovl_create_real(struct inode *dir, struct dentry *newdentry,
- struct kstat *stat, const char *link,
- struct dentry *hardlink, bool debug)
+ struct cattr *attr, struct dentry *hardlink, bool debug)
{
int err;
@@ -93,13 +92,13 @@ int ovl_create_real(struct inode *dir, struct dentry *newdentry,
if (hardlink) {
err = ovl_do_link(hardlink, dir, newdentry, debug);
} else {
- switch (stat->mode & S_IFMT) {
+ switch (attr->mode & S_IFMT) {
case S_IFREG:
- err = ovl_do_create(dir, newdentry, stat->mode, debug);
+ err = ovl_do_create(dir, newdentry, attr->mode, debug);
break;
case S_IFDIR:
- err = ovl_do_mkdir(dir, newdentry, stat->mode, debug);
+ err = ovl_do_mkdir(dir, newdentry, attr->mode, debug);
break;
case S_IFCHR:
@@ -107,11 +106,11 @@ int ovl_create_real(struct inode *dir, struct dentry *newdentry,
case S_IFIFO:
case S_IFSOCK:
err = ovl_do_mknod(dir, newdentry,
- stat->mode, stat->rdev, debug);
+ attr->mode, attr->rdev, debug);
break;
case S_IFLNK:
- err = ovl_do_symlink(dir, newdentry, link, debug);
+ err = ovl_do_symlink(dir, newdentry, attr->link, debug);
break;
default:
@@ -190,8 +189,7 @@ static bool ovl_type_merge(struct dentry *dentry)
}
static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
- struct kstat *stat, const char *link,
- struct dentry *hardlink)
+ struct cattr *attr, struct dentry *hardlink)
{
struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
struct inode *udir = upperdir->d_inode;
@@ -199,7 +197,7 @@ static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
int err;
if (!hardlink && !IS_POSIXACL(udir))
- stat->mode &= ~current_umask();
+ attr->mode &= ~current_umask();
inode_lock_nested(udir, I_MUTEX_PARENT);
newdentry = lookup_one_len(dentry->d_name.name, upperdir,
@@ -207,7 +205,7 @@ static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
err = PTR_ERR(newdentry);
if (IS_ERR(newdentry))
goto out_unlock;
- err = ovl_create_real(udir, newdentry, stat, link, hardlink, false);
+ err = ovl_create_real(udir, newdentry, attr, hardlink, false);
if (err)
goto out_dput;
@@ -282,7 +280,8 @@ static struct dentry *ovl_clear_empty(struct dentry *dentry,
if (IS_ERR(opaquedir))
goto out_unlock;
- err = ovl_create_real(wdir, opaquedir, &stat, NULL, NULL, true);
+ err = ovl_create_real(wdir, opaquedir,
+ &(struct cattr){.mode = stat.mode}, NULL, true);
if (err)
goto out_dput;
@@ -382,7 +381,7 @@ out_free:
}
static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
- struct kstat *stat, const char *link,
+ struct cattr *cattr,
struct dentry *hardlink)
{
struct dentry *workdir = ovl_workdir(dentry);
@@ -399,7 +398,7 @@ static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
if (!hardlink) {
err = posix_acl_create(dentry->d_parent->d_inode,
- &stat->mode, &default_acl, &acl);
+ &cattr->mode, &default_acl, &acl);
if (err)
return err;
}
@@ -419,7 +418,7 @@ static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
if (IS_ERR(upper))
goto out_dput;
- err = ovl_create_real(wdir, newdentry, stat, link, hardlink, true);
+ err = ovl_create_real(wdir, newdentry, cattr, hardlink, true);
if (err)
goto out_dput2;
@@ -427,10 +426,11 @@ static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
* mode could have been mutilated due to umask (e.g. sgid directory)
*/
if (!hardlink &&
- !S_ISLNK(stat->mode) && newdentry->d_inode->i_mode != stat->mode) {
+ !S_ISLNK(cattr->mode) &&
+ newdentry->d_inode->i_mode != cattr->mode) {
struct iattr attr = {
.ia_valid = ATTR_MODE,
- .ia_mode = stat->mode,
+ .ia_mode = cattr->mode,
};
inode_lock(newdentry->d_inode);
err = notify_change(newdentry, &attr, NULL);
@@ -450,7 +450,7 @@ static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
goto out_cleanup;
}
- if (!hardlink && S_ISDIR(stat->mode)) {
+ if (!hardlink && S_ISDIR(cattr->mode)) {
err = ovl_set_opaque(dentry, newdentry);
if (err)
goto out_cleanup;
@@ -487,8 +487,7 @@ out_cleanup:
}
static int ovl_create_or_link(struct dentry *dentry, struct inode *inode,
- struct kstat *stat, const char *link,
- struct dentry *hardlink)
+ struct cattr *attr, struct dentry *hardlink)
{
int err;
const struct cred *old_cred;
@@ -506,7 +505,7 @@ static int ovl_create_or_link(struct dentry *dentry, struct inode *inode,
override_cred->fsgid = inode->i_gid;
if (!hardlink) {
err = security_dentry_create_files_as(dentry,
- stat->mode, &dentry->d_name, old_cred,
+ attr->mode, &dentry->d_name, old_cred,
override_cred);
if (err) {
put_cred(override_cred);
@@ -517,11 +516,11 @@ static int ovl_create_or_link(struct dentry *dentry, struct inode *inode,
put_cred(override_cred);
if (!ovl_dentry_is_whiteout(dentry))
- err = ovl_create_upper(dentry, inode, stat, link,
+ err = ovl_create_upper(dentry, inode, attr,
hardlink);
else
- err = ovl_create_over_whiteout(dentry, inode, stat,
- link, hardlink);
+ err = ovl_create_over_whiteout(dentry, inode, attr,
+ hardlink);
}
out_revert_creds:
revert_creds(old_cred);
@@ -540,8 +539,9 @@ static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
{
int err;
struct inode *inode;
- struct kstat stat = {
+ struct cattr attr = {
.rdev = rdev,
+ .link = link,
};
err = ovl_want_write(dentry);
@@ -554,9 +554,9 @@ static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
goto out_drop_write;
inode_init_owner(inode, dentry->d_parent->d_inode, mode);
- stat.mode = inode->i_mode;
+ attr.mode = inode->i_mode;
- err = ovl_create_or_link(dentry, inode, &stat, link, NULL);
+ err = ovl_create_or_link(dentry, inode, &attr, NULL);
if (err)
iput(inode);
@@ -610,7 +610,7 @@ static int ovl_link(struct dentry *old, struct inode *newdir,
inode = d_inode(old);
ihold(inode);
- err = ovl_create_or_link(new, inode, NULL, NULL, ovl_dentry_upper(old));
+ err = ovl_create_or_link(new, inode, NULL, ovl_dentry_upper(old));
if (err)
iput(inode);
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index e07aa7b0ddb7..8af450b0e57a 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -212,8 +212,13 @@ static inline void ovl_copyattr(struct inode *from, struct inode *to)
/* dir.c */
extern const struct inode_operations ovl_dir_inode_operations;
struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry);
+struct cattr {
+ dev_t rdev;
+ umode_t mode;
+ const char *link;
+};
int ovl_create_real(struct inode *dir, struct dentry *newdentry,
- struct kstat *stat, const char *link,
+ struct cattr *attr,
struct dentry *hardlink, bool debug);
void ovl_cleanup(struct inode *dir, struct dentry *dentry);
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 4bd1e9c7246f..7da36ccda438 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -354,12 +354,9 @@ retry:
strlen(OVL_WORKDIR_NAME));
if (!IS_ERR(work)) {
- struct kstat stat = {
- .mode = S_IFDIR | 0,
- };
struct iattr attr = {
.ia_valid = ATTR_MODE,
- .ia_mode = stat.mode,
+ .ia_mode = S_IFDIR | 0,
};
if (work->d_inode) {
@@ -373,7 +370,9 @@ retry:
goto retry;
}
- err = ovl_create_real(dir, work, &stat, NULL, NULL, true);
+ err = ovl_create_real(dir, work,
+ &(struct cattr){.mode = S_IFDIR | 0},
+ NULL, true);
if (err)
goto out_dput;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.