The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
Possible dependencies:
4c0d5778385c ("ext4: don't set up encryption key during jbd2 transaction")
5298d4bfe80f ("unicode: clean up the Kconfig symbol confusion")
2b3d04787012 ("unicode: Add utf8-data module")
6ca99ce756c2 ("unicode: cache the normalization tables in struct unicode_map")
fbc59d65059e ("unicode: move utf8cursor to utf8-selftest.c")
9012d79cf0c7 ("unicode: simplify utf8len")
379210db489c ("unicode: remove the unused utf8{,n}age{min,max} functions")
49bd03cc7e95 ("unicode: pass a UNICODE_AGE() tripple to utf8_load")
f3a9c8239600 ("unicode: mark the version field in struct unicode_map unsigned")
a440943e68cd ("unicode: remove the charset field from struct unicode_map")
227c4d507c71 ("Merge tag 'f2fs-for-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 4c0d5778385cb3618ff26a561ce41de2b7d9de70 Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Sun, 6 Nov 2022 14:48:36 -0800
Subject: [PATCH] ext4: don't set up encryption key during jbd2 transaction
Commit a80f7fcf1867 ("ext4: fixup ext4_fc_track_* functions' signature")
extended the scope of the transaction in ext4_unlink() too far, making
it include the call to ext4_find_entry(). However, ext4_find_entry()
can deadlock when called from within a transaction because it may need
to set up the directory's encryption key.
Fix this by restoring the transaction to its original scope.
Reported-by: syzbot+1a748d0007eeac3ab079@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: a80f7fcf1867 ("ext4: fixup ext4_fc_track_* functions' signature")
Cc: <stable@xxxxxxxxxxxxxxx> # v5.10+
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221106224841.279231-3-ebiggers@xxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 3afdd99bb214..4e739902dc03 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3620,8 +3620,8 @@ extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
unsigned int blocksize);
extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
struct buffer_head *bh);
-extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
- struct inode *inode);
+extern int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
+ struct inode *inode, struct dentry *dentry);
extern int __ext4_link(struct inode *dir, struct inode *inode,
struct dentry *dentry);
diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c
index 6d98f2b39b77..da0c8228cf9c 100644
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -1397,7 +1397,7 @@ static int ext4_fc_replay_unlink(struct super_block *sb, struct ext4_fc_tl *tl,
return 0;
}
- ret = __ext4_unlink(NULL, old_parent, &entry, inode);
+ ret = __ext4_unlink(old_parent, &entry, inode, NULL);
/* -ENOENT ok coz it might not exist anymore. */
if (ret == -ENOENT)
ret = 0;
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index c08c0aba1883..a789ea9b61a0 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3204,14 +3204,20 @@ static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
return retval;
}
-int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
- struct inode *inode)
+int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
+ struct inode *inode,
+ struct dentry *dentry /* NULL during fast_commit recovery */)
{
int retval = -ENOENT;
struct buffer_head *bh;
struct ext4_dir_entry_2 *de;
+ handle_t *handle;
int skip_remove_dentry = 0;
+ /*
+ * Keep this outside the transaction; it may have to set up the
+ * directory's encryption key, which isn't GFP_NOFS-safe.
+ */
bh = ext4_find_entry(dir, d_name, &de, NULL);
if (IS_ERR(bh))
return PTR_ERR(bh);
@@ -3228,7 +3234,14 @@ int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name
if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY)
skip_remove_dentry = 1;
else
- goto out;
+ goto out_bh;
+ }
+
+ handle = ext4_journal_start(dir, EXT4_HT_DIR,
+ EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
+ if (IS_ERR(handle)) {
+ retval = PTR_ERR(handle);
+ goto out_bh;
}
if (IS_DIRSYNC(dir))
@@ -3237,12 +3250,12 @@ int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name
if (!skip_remove_dentry) {
retval = ext4_delete_entry(handle, dir, de, bh);
if (retval)
- goto out;
+ goto out_handle;
dir->i_ctime = dir->i_mtime = current_time(dir);
ext4_update_dx_flag(dir);
retval = ext4_mark_inode_dirty(handle, dir);
if (retval)
- goto out;
+ goto out_handle;
} else {
retval = 0;
}
@@ -3255,15 +3268,17 @@ int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name
ext4_orphan_add(handle, inode);
inode->i_ctime = current_time(inode);
retval = ext4_mark_inode_dirty(handle, inode);
-
-out:
+ if (dentry && !retval)
+ ext4_fc_track_unlink(handle, dentry);
+out_handle:
+ ext4_journal_stop(handle);
+out_bh:
brelse(bh);
return retval;
}
static int ext4_unlink(struct inode *dir, struct dentry *dentry)
{
- handle_t *handle;
int retval;
if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
@@ -3281,16 +3296,7 @@ static int ext4_unlink(struct inode *dir, struct dentry *dentry)
if (retval)
goto out_trace;
- handle = ext4_journal_start(dir, EXT4_HT_DIR,
- EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
- if (IS_ERR(handle)) {
- retval = PTR_ERR(handle);
- goto out_trace;
- }
-
- retval = __ext4_unlink(handle, dir, &dentry->d_name, d_inode(dentry));
- if (!retval)
- ext4_fc_track_unlink(handle, dentry);
+ retval = __ext4_unlink(dir, &dentry->d_name, d_inode(dentry), dentry);
#if IS_ENABLED(CONFIG_UNICODE)
/* VFS negative dentries are incompatible with Encoding and
* Case-insensitiveness. Eventually we'll want avoid
@@ -3301,8 +3307,6 @@ static int ext4_unlink(struct inode *dir, struct dentry *dentry)
if (IS_CASEFOLDED(dir))
d_invalidate(dentry);
#endif
- if (handle)
- ext4_journal_stop(handle);
out_trace:
trace_ext4_unlink_exit(dentry, retval);
