From 0fbcb5251fc81b58969b272c4fb7374a7b922e3e Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Sun, 6 Nov 2022 14:48:35 -0800 Subject: ext4: disable fast-commit of encrypted dir operations fast-commit of create, link, and unlink operations in encrypted directories is completely broken because the unencrypted filenames are being written to the fast-commit journal instead of the encrypted filenames. These operations can't be replayed, as encryption keys aren't present at journal replay time. It is also an information leak. Until if/when we can get this working properly, make encrypted directory operations ineligible for fast-commit. Note that fast-commit operations on encrypted regular files continue to be allowed, as they seem to work. Fixes: aa75f4d3daae ("ext4: main fast-commit commit path") Cc: # v5.10+ Signed-off-by: Eric Biggers Link: https://lore.kernel.org/r/20221106224841.279231-2-ebiggers@kernel.org Signed-off-by: Theodore Ts'o --- fs/ext4/fast_commit.c | 41 +++++++++++++++++++++++++---------------- 1 file changed, 25 insertions(+), 16 deletions(-) (limited to 'fs/ext4/fast_commit.c') diff --git a/fs/ext4/fast_commit.c b/fs/ext4/fast_commit.c index 0f6d0a80467d..6d98f2b39b77 100644 --- a/fs/ext4/fast_commit.c +++ b/fs/ext4/fast_commit.c @@ -420,25 +420,34 @@ static int __track_dentry_update(struct inode *inode, void *arg, bool update) struct __track_dentry_update_args *dentry_update = (struct __track_dentry_update_args *)arg; struct dentry *dentry = dentry_update->dentry; - struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); + struct inode *dir = dentry->d_parent->d_inode; + struct super_block *sb = inode->i_sb; + struct ext4_sb_info *sbi = EXT4_SB(sb); mutex_unlock(&ei->i_fc_lock); + + if (IS_ENCRYPTED(dir)) { + ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_ENCRYPTED_FILENAME, + NULL); + mutex_lock(&ei->i_fc_lock); + return -EOPNOTSUPP; + } + node = kmem_cache_alloc(ext4_fc_dentry_cachep, GFP_NOFS); if (!node) { - ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_NOMEM, NULL); + ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_NOMEM, NULL); mutex_lock(&ei->i_fc_lock); return -ENOMEM; } node->fcd_op = dentry_update->op; - node->fcd_parent = dentry->d_parent->d_inode->i_ino; + node->fcd_parent = dir->i_ino; node->fcd_ino = inode->i_ino; if (dentry->d_name.len > DNAME_INLINE_LEN) { node->fcd_name.name = kmalloc(dentry->d_name.len, GFP_NOFS); if (!node->fcd_name.name) { kmem_cache_free(ext4_fc_dentry_cachep, node); - ext4_fc_mark_ineligible(inode->i_sb, - EXT4_FC_REASON_NOMEM, NULL); + ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_NOMEM, NULL); mutex_lock(&ei->i_fc_lock); return -ENOMEM; } @@ -2249,17 +2258,17 @@ void ext4_fc_init(struct super_block *sb, journal_t *journal) journal->j_fc_cleanup_callback = ext4_fc_cleanup; } -static const char *fc_ineligible_reasons[] = { - "Extended attributes changed", - "Cross rename", - "Journal flag changed", - "Insufficient memory", - "Swap boot", - "Resize", - "Dir renamed", - "Falloc range op", - "Data journalling", - "FC Commit Failed" +static const char * const fc_ineligible_reasons[] = { + [EXT4_FC_REASON_XATTR] = "Extended attributes changed", + [EXT4_FC_REASON_CROSS_RENAME] = "Cross rename", + [EXT4_FC_REASON_JOURNAL_FLAG_CHANGE] = "Journal flag changed", + [EXT4_FC_REASON_NOMEM] = "Insufficient memory", + [EXT4_FC_REASON_SWAP_BOOT] = "Swap boot", + [EXT4_FC_REASON_RESIZE] = "Resize", + [EXT4_FC_REASON_RENAME_DIR] = "Dir renamed", + [EXT4_FC_REASON_FALLOC_RANGE] = "Falloc range op", + [EXT4_FC_REASON_INODE_JOURNAL_DATA] = "Data journalling", + [EXT4_FC_REASON_ENCRYPTED_FILENAME] = "Encrypted filename", }; int ext4_fc_info_show(struct seq_file *seq, void *v) -- cgit v1.2.3