Re: [PATCH] ext4: fix another off-by-one fsmap error on 1k block filesystems

[Darrick J. Wong]

Ping, Ted?

--D

On Thu, Feb 16, 2023 at 10:55:48AM -0800, Darrick J. Wong wrote:
> From: Darrick J. Wong <djwong@xxxxxxxxxx>
> 
> Apparently syzbot figured out that issuing this FSMAP call:
> 
> struct fsmap_head cmd = {
> 	.fmh_count	= ...;
> 	.fmh_keys	= {
> 		{ .fmr_device = /* ext4 dev */, .fmr_physical = 0, },
> 		{ .fmr_device = /* ext4 dev */, .fmr_physical = 0, },
> 	},
> ...
> };
> ret = ioctl(fd, FS_IOC_GETFSMAP, &cmd);
> 
> Produces this crash if the underlying filesystem is a 1k-block ext4
> filesystem:
> 
> kernel BUG at fs/ext4/ext4.h:3331!
> invalid opcode: 0000 [#1] PREEMPT SMP
> CPU: 3 PID: 3227965 Comm: xfs_io Tainted: G        W  O       6.2.0-rc8-achx
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
> RIP: 0010:ext4_mb_load_buddy_gfp+0x47c/0x570 [ext4]
> RSP: 0018:ffffc90007c03998 EFLAGS: 00010246
> RAX: ffff888004978000 RBX: ffffc90007c03a20 RCX: ffff888041618000
> RDX: 0000000000000000 RSI: 00000000000005a4 RDI: ffffffffa0c99b11
> RBP: ffff888012330000 R08: ffffffffa0c2b7d0 R09: 0000000000000400
> R10: ffffc90007c03950 R11: 0000000000000000 R12: 0000000000000001
> R13: 00000000ffffffff R14: 0000000000000c40 R15: ffff88802678c398
> FS:  00007fdf2020c880(0000) GS:ffff88807e100000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007ffd318a5fe8 CR3: 000000007f80f001 CR4: 00000000001706e0
> Call Trace:
>  <TASK>
>  ext4_mballoc_query_range+0x4b/0x210 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]
>  ext4_getfsmap_datadev+0x713/0x890 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]
>  ext4_getfsmap+0x2b7/0x330 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]
>  ext4_ioc_getfsmap+0x153/0x2b0 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]
>  __ext4_ioctl+0x2a7/0x17e0 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]
>  __x64_sys_ioctl+0x82/0xa0
>  do_syscall_64+0x2b/0x80
>  entry_SYSCALL_64_after_hwframe+0x46/0xb0
> RIP: 0033:0x7fdf20558aff
> RSP: 002b:00007ffd318a9e30 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00000000000200c0 RCX: 00007fdf20558aff
> RDX: 00007fdf1feb2010 RSI: 00000000c0c0583b RDI: 0000000000000003
> RBP: 00005625c0634be0 R08: 00005625c0634c40 R09: 0000000000000001
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdf1feb2010
> R13: 00005625be70d994 R14: 0000000000000800 R15: 0000000000000000
> 
> For GETFSMAP calls, the caller selects a physical block device by
> writing its block number into fsmap_head.fmh_keys[01].fmr_device.
> To query mappings for a subrange of the device, the starting byte of the
> range is written to fsmap_head.fmh_keys[0].fmr_physical and the last
> byte of the range goes in fsmap_head.fmh_keys[1].fmr_physical.
> 
> IOWs, to query what mappings overlap with bytes 3-14 of /dev/sda, you'd
> set the inputs as follows:
> 
> 	fmh_keys[0] = { .fmr_device = major(8, 0), .fmr_physical = 3},
> 	fmh_keys[1] = { .fmr_device = major(8, 0), .fmr_physical = 14},
> 
> Which would return you whatever is mapped in the 12 bytes starting at
> physical offset 3.
> 
> The crash is due to insufficient range validation of keys[1] in
> ext4_getfsmap_datadev.  On 1k-block filesystems, block 0 is not part of
> the filesystem, which means that s_first_data_block is nonzero.
> ext4_get_group_no_and_offset subtracts this quantity from the blocknr
> argument before cracking it into a group number and a block number
> within a group.  IOWs, block group 0 spans blocks 1-8192 (1-based)
> instead of 0-8191 (0-based) like what happens with larger blocksizes.
> 
> The net result of this encoding is that blocknr < s_first_data_block is
> not a valid input to this function.  The end_fsb variable is set from
> the keys that are copied from userspace, which means that in the above
> example, its value is zero.  That leads to an underflow here:
> 
> 	blocknr = blocknr - le32_to_cpu(es->s_first_data_block);
> 
> The division then operates on -1:
> 
> 	offset = do_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb)) >>
> 		EXT4_SB(sb)->s_cluster_bits;
> 
> Leaving an impossibly large group number (2^32-1) in blocknr.
> ext4_getfsmap_check_keys checked that keys[0].fmr_physical and
> keys[1].fmr_physical are in increasing order, but
> ext4_getfsmap_datadev adjusts keys[0].fmr_physical to be at least
> s_first_data_block.  This implies that we have to check it again after
> the adjustment, which is the piece that I forgot.
> 
> Fixes: 4a4956249dac ("ext4: fix off-by-one fsmap error on 1k block filesystems")
> Link: https://syzkaller.appspot.com/bug?id=79d5768e9bfe362911ac1a5057a36fc6b5c30002
> Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
> ---
>  fs/ext4/fsmap.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/ext4/fsmap.c b/fs/ext4/fsmap.c
> index 4493ef0c715e..cdf9bfe10137 100644
> --- a/fs/ext4/fsmap.c
> +++ b/fs/ext4/fsmap.c
> @@ -486,6 +486,8 @@ static int ext4_getfsmap_datadev(struct super_block *sb,
>  		keys[0].fmr_physical = bofs;
>  	if (keys[1].fmr_physical >= eofs)
>  		keys[1].fmr_physical = eofs - 1;
> +	if (keys[1].fmr_physical < keys[0].fmr_physical)
> +		return 0;
>  	start_fsb = keys[0].fmr_physical;
>  	end_fsb = keys[1].fmr_physical;
>