linux-kernel - Re: [PATCH] e2fsck: fix acl block leak when process orphan list

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Message-ID: <20240418083815.3qjyo7jpaqhueen3@quack3>
Date: Thu, 18 Apr 2024 10:38:15 +0200
From: Jan Kara <jack@...e.cz>
To: Ye Bin <yebin10@...wei.com>
Cc: tytso@....edu, adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, jack@...e.cz
Subject: Re: [PATCH] e2fsck: fix acl block leak when process orphan list

On Thu 18-04-24 14:39:46, Ye Bin wrote:
> There's a issue:
> []$~/e2fsprogs/e2fsck/e2fsck -f scsi-disk2.img
> e2fsck 1.47.0 (5-Feb-2023)
> scsi-disk2.img: recovering journal
> Clearing orphaned inode 12 (uid=0, gid=0, mode=0140777, size=0)
> Pass 1: Checking inodes, blocks, and sizes
> Extended attribute block 4247 has reference count 3, should be 2.  Fix<y>? no
> Pass 2: Checking directory structure
> Pass 3: Checking directory connectivity
> Pass 4: Checking reference counts
> Pass 5: Checking group summary information
> Free blocks count wrong (249189, counted=249188).
> Fix<y>? no
> Free inodes count wrong (65526, counted=65523).
> Fix<y>? no
> 
> scsi-disk2.img: ***** FILE SYSTEM WAS MODIFIED *****
> 
> scsi-disk2.img: ********** WARNING: Filesystem still has errors **********
> 
> scsi-disk2.img: 10/65536 files (0.0% non-contiguous), 12955/262144 blocks
> 
> Above issue can reproduce as follows:
> step1: socat UNIX-LISTEN:/home/test/mysocket.sock,mode=777,reuseaddr,fork EXEC:/home/test  &
> step2: setfacl some xattr for mysocket.sock
> step3: cp -a /home/test/mysocket.sock /home/test/sock1
>        cp -a /home/test/mysocket.sock /home/test/sock2
> step4: sync
> step5: Power-off
> step6: run e2fsck
> 
> As after commit 42475e281d22 add ext2fs_inode_has_valid_blocks() judgement in
> release_inode_blocks() which means socket type file skip realse block include
> ACL block. The kernel does not restrict the setting of extended attributes for
> socket files. So this will lead to ACL block leak.
> To solve above issue there's need to release ACL block for other kind of
> special file.
> 
> Fixes: 42475e281d22 ("super.c (release_inode_blocks): Don't try to release the blocks if the orphaned inode is a device file, symlink, or some other kind of special file that doesn't have a block list.")
> Signed-off-by: Ye Bin <yebin10@...wei.com>

Makes sense. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza


> ---
>  e2fsck/super.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/e2fsck/super.c b/e2fsck/super.c
> index be40dd8f..cefc2b07 100644
> --- a/e2fsck/super.c
> +++ b/e2fsck/super.c
> @@ -196,7 +196,7 @@ static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino,
>  	__u32				count;
>  
>  	if (!ext2fs_inode_has_valid_blocks2(fs, EXT2_INODE(inode)))
> -		return 0;
> +		goto release_acl;
>  
>  	pb.buf = block_buf + 3 * ctx->fs->blocksize;
>  	pb.ctx = ctx;
> @@ -235,7 +235,7 @@ static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino,
>  	if (pb.truncated_blocks)
>  		ext2fs_iblk_sub_blocks(fs, EXT2_INODE(inode),
>  				pb.truncated_blocks);
> -
> +release_acl:
>  	blk = ext2fs_file_acl_block(fs, EXT2_INODE(inode));
>  	if (blk) {
>  		retval = ext2fs_adjust_ea_refcount3(fs, blk, block_buf, -1,
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR