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Diffstat (limited to 'fs')
-rw-r--r--fs/cachefiles/namei.c2
-rw-r--r--fs/ecryptfs/inode.c2
-rw-r--r--fs/namei.c37
-rw-r--r--fs/nfsd/vfs.c4
-rw-r--r--fs/overlayfs/copy_up.c9
-rw-r--r--fs/overlayfs/dir.c4
-rw-r--r--fs/overlayfs/super.c6
-rw-r--r--fs/overlayfs/util.c7
-rw-r--r--fs/smb/server/vfs.c5
9 files changed, 62 insertions, 14 deletions
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index 7bf7a5fcc045..7ade836beb58 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -305,6 +305,8 @@ try_again:
/* do the multiway lock magic */
trap = lock_rename(cache->graveyard, dir);
+ if (IS_ERR(trap))
+ return PTR_ERR(trap);
/* do some checks before getting the grave dentry */
if (rep->d_parent != dir || IS_DEADDIR(d_inode(rep))) {
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index a25dd3d20008..8efd20dc902b 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -599,6 +599,8 @@ ecryptfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
target_inode = d_inode(new_dentry);
trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
+ if (IS_ERR(trap))
+ return PTR_ERR(trap);
dget(lower_new_dentry);
rc = -EINVAL;
if (lower_old_dentry->d_parent != lower_old_dir_dentry)
diff --git a/fs/namei.c b/fs/namei.c
index 29bafbdb44ca..6b0302ac80d1 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3014,21 +3014,37 @@ static inline int may_create(struct mnt_idmap *idmap,
return inode_permission(idmap, dir, MAY_WRITE | MAY_EXEC);
}
+// p1 != p2, both are on the same filesystem, ->s_vfs_rename_mutex is held
static struct dentry *lock_two_directories(struct dentry *p1, struct dentry *p2)
{
- struct dentry *p;
+ struct dentry *p = p1, *q = p2, *r;
- p = d_ancestor(p2, p1);
- if (p) {
+ while ((r = p->d_parent) != p2 && r != p)
+ p = r;
+ if (r == p2) {
+ // p is a child of p2 and an ancestor of p1 or p1 itself
inode_lock_nested(p2->d_inode, I_MUTEX_PARENT);
inode_lock_nested(p1->d_inode, I_MUTEX_PARENT2);
return p;
}
-
- p = d_ancestor(p1, p2);
- inode_lock_nested(p1->d_inode, I_MUTEX_PARENT);
- inode_lock_nested(p2->d_inode, I_MUTEX_PARENT2);
- return p;
+ // p is the root of connected component that contains p1
+ // p2 does not occur on the path from p to p1
+ while ((r = q->d_parent) != p1 && r != p && r != q)
+ q = r;
+ if (r == p1) {
+ // q is a child of p1 and an ancestor of p2 or p2 itself
+ inode_lock_nested(p1->d_inode, I_MUTEX_PARENT);
+ inode_lock_nested(p2->d_inode, I_MUTEX_PARENT2);
+ return q;
+ } else if (likely(r == p)) {
+ // both p2 and p1 are descendents of p
+ inode_lock_nested(p1->d_inode, I_MUTEX_PARENT);
+ inode_lock_nested(p2->d_inode, I_MUTEX_PARENT2);
+ return NULL;
+ } else { // no common ancestor at the time we'd been called
+ mutex_unlock(&p1->d_sb->s_vfs_rename_mutex);
+ return ERR_PTR(-EXDEV);
+ }
}
/*
@@ -4947,6 +4963,10 @@ retry:
retry_deleg:
trap = lock_rename(new_path.dentry, old_path.dentry);
+ if (IS_ERR(trap)) {
+ error = PTR_ERR(trap);
+ goto exit_lock_rename;
+ }
old_dentry = lookup_one_qstr_excl(&old_last, old_path.dentry,
lookup_flags);
@@ -5014,6 +5034,7 @@ exit4:
dput(old_dentry);
exit3:
unlock_rename(new_path.dentry, old_path.dentry);
+exit_lock_rename:
if (delegated_inode) {
error = break_deleg_wait(&delegated_inode);
if (!error)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index fbbea7498f02..a99260c3f9bc 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1813,6 +1813,10 @@ retry:
}
trap = lock_rename(tdentry, fdentry);
+ if (IS_ERR(trap)) {
+ err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev;
+ goto out;
+ }
err = fh_fill_pre_attrs(ffhp);
if (err != nfs_ok)
goto out_unlock;
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 4382881b0709..e44dc5f66161 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -722,7 +722,7 @@ static int ovl_copy_up_workdir(struct ovl_copy_up_ctx *c)
struct inode *inode;
struct inode *udir = d_inode(c->destdir), *wdir = d_inode(c->workdir);
struct path path = { .mnt = ovl_upper_mnt(ofs) };
- struct dentry *temp, *upper;
+ struct dentry *temp, *upper, *trap;
struct ovl_cu_creds cc;
int err;
struct ovl_cattr cattr = {
@@ -760,9 +760,11 @@ static int ovl_copy_up_workdir(struct ovl_copy_up_ctx *c)
* If temp was moved, abort without the cleanup.
*/
ovl_start_write(c->dentry);
- if (lock_rename(c->workdir, c->destdir) != NULL ||
- temp->d_parent != c->workdir) {
+ trap = lock_rename(c->workdir, c->destdir);
+ if (trap || temp->d_parent != c->workdir) {
err = -EIO;
+ if (IS_ERR(trap))
+ goto out;
goto unlock;
} else if (err) {
goto cleanup;
@@ -803,6 +805,7 @@ static int ovl_copy_up_workdir(struct ovl_copy_up_ctx *c)
ovl_set_flag(OVL_WHITEOUTS, inode);
unlock:
unlock_rename(c->workdir, c->destdir);
+out:
ovl_end_write(c->dentry);
return err;
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index aab3f5d93556..0f8b4a719237 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -1180,6 +1180,10 @@ static int ovl_rename(struct mnt_idmap *idmap, struct inode *olddir,
}
trap = lock_rename(new_upperdir, old_upperdir);
+ if (IS_ERR(trap)) {
+ err = PTR_ERR(trap);
+ goto out_revert_creds;
+ }
olddentry = ovl_lookup_upper(ofs, old->d_name.name, old_upperdir,
old->d_name.len);
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index a0967bb25003..fc3a6ff648bd 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -439,8 +439,10 @@ static bool ovl_workdir_ok(struct dentry *workdir, struct dentry *upperdir)
bool ok = false;
if (workdir != upperdir) {
- ok = (lock_rename(workdir, upperdir) == NULL);
- unlock_rename(workdir, upperdir);
+ struct dentry *trap = lock_rename(workdir, upperdir);
+ if (!IS_ERR(trap))
+ unlock_rename(workdir, upperdir);
+ ok = (trap == NULL);
}
return ok;
}
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 50a201e9cd39..7b667345e673 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -1198,12 +1198,17 @@ void ovl_nlink_end(struct dentry *dentry)
int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir)
{
+ struct dentry *trap;
+
/* Workdir should not be the same as upperdir */
if (workdir == upperdir)
goto err;
/* Workdir should not be subdir of upperdir and vice versa */
- if (lock_rename(workdir, upperdir) != NULL)
+ trap = lock_rename(workdir, upperdir);
+ if (IS_ERR(trap))
+ goto err;
+ if (trap)
goto err_unlock;
return 0;
diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c
index c53dea5598fc..4cf8523ad038 100644
--- a/fs/smb/server/vfs.c
+++ b/fs/smb/server/vfs.c
@@ -708,6 +708,10 @@ retry:
goto out2;
trap = lock_rename_child(old_child, new_path.dentry);
+ if (IS_ERR(trap)) {
+ err = PTR_ERR(trap);
+ goto out_drop_write;
+ }
old_parent = dget(old_child->d_parent);
if (d_unhashed(old_child)) {
@@ -770,6 +774,7 @@ out4:
out3:
dput(old_parent);
unlock_rename(old_parent, new_path.dentry);
+out_drop_write:
mnt_drop_write(old_path->mnt);
out2:
path_put(&new_path);
generated by cgit (git 2.34.1) at 2024-06-13 23:31:30 +0000