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Date: Tue, 03 Jul 2018 23:41:05 +0000
From: bugzilla-daemon@...zilla.kernel.org
To: linux-ext4@...nel.org
Subject: [Bug 200401] New: Another buffer overrun in ext4_xattr_set_entry()
when operating a corrupted ext4 image
https://bugzilla.kernel.org/show_bug.cgi?id=200401
Bug ID: 200401
Summary: Another buffer overrun in ext4_xattr_set_entry() when
operating a corrupted ext4 image
Product: File System
Version: 2.5
Kernel Version: 4.18
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
Assignee: fs_ext4@...nel-bugs.osdl.org
Reporter: wen.xu@...ech.edu
Regression: No
Created attachment 277155
--> https://bugzilla.kernel.org/attachment.cgi?id=277155&action=edit
The (compressed) crafted image which causes crash
- Reproduce (tested w/ dev branch)
# mkdir mnt
# mount -t ext4 final.img mnt
# gcc -o poc poc.c
# ./poc ./mnt
- Kernel message
[ 211.941955]
==================================================================
[ 211.943725] BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x14e2/0x1990
[ 211.945175] Read of size 18446744073709551604 at addr ffff8801cf4bc3f8 by
task poc/1379
[ 211.946854]
[ 211.947737]
[ 211.948087] The buggy address belongs to the page:
[ 211.949138] page:ffffea00073d2f00 count:2 mapcount:0
mapping:ffff8801e6f28610 index:0x11
[ 211.950849] flags: 0x2ffff0000001074(referenced|dirty|lru|active|private)
[ 211.952308] raw: 02ffff0000001074 ffff8801e6f28610 0000000000000011
00000002ffffffff
[ 211.953921] raw: ffffea00073d2ee0 ffffea00073d2f60 ffff8801dc030c78
ffff8801e5212200
[ 211.955548] page dumped because: kasan: bad access detected
[ 211.956736] page->mem_cgroup:ffff8801e5212200
[ 211.957673]
[ 211.958021] Memory state around the buggy address:
[ 211.959046] ffff8801cf4bc280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00
[ 211.960581] ffff8801cf4bc300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00
[ 211.962096] >ffff8801cf4bc380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00
[ 211.963637]
^
[ 211.965106] ffff8801cf4bc400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00
[ 211.966630] ffff8801cf4bc480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00
[ 211.968154]
==================================================================
[ 212.070820] systemd[1]: segfault at 5593546f5010 ip 00005593546f5010 sp
00007ffd3ee613c0 error 15
[ 212.073130] systemd[1]: segfault at 8f8 ip 00007f997d5f266a sp
00007ffd3ee60cb0 error 4 in libc-2.23.so[7f997d575000+1c0000]
[ 212.165887] BUG: unable to handle kernel paging request at ffff8801da800000
[ 212.167411] PGD ef40067 P4D ef40067 PUD ef47067 PMD 1da8e5063 PTE
80000001da800061
[ 212.169039] Oops: 0003 [#1] SMP KASAN PTI
[ 212.169923] Modules linked in: snd_hda_codec_generic snd_hda_intel
snd_hda_codec snd_hwdep snd_hda_core snd_pcm snd_timer snd soundcore i2c_piix4
mac_hid ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi
scsi_transport_iscsi autofs4 btrfs zstd_decompress zstd_compress xxhash raid10
raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq
raid1 raid0 multipath linear 8139too qxl drm_kms_helper syscopyarea
crct10dif_pclmul sysfillrect sysimgblt fb_sys_fops crc32_pclmul ttm drm
aesni_intel aes_x86_64 crypto_simd cryptd glue_helper 8139cp mii pata_acpi
floppy
[ 212.181267] CPU: 1 PID: 1379 Comm: poc Tainted: G B
4.17.0-rc4+ #9
[ 212.182814] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
Ubuntu-1.8.2-1ubuntu1 04/01/2014
[ 212.184864] RIP: 0010:__memmove+0x5b/0x1a0
[ 212.185575] request_module: kmod_concurrent_max (0) close to 0
(max_modprobes: 50), for module binfmt-003e, throttling...
[ 212.185756] RSP: 0018:ffff8801f283f0e8 EFLAGS: 00010286
[ 212.189141] RAX: ffff8801cf4bc3e8 RBX: fffffffffffffff4 RCX:
ffffffffa0556472
[ 212.190632] RDX: fffffffff4cbc3b4 RSI: ffff8801da800018 RDI:
ffff8801da7fffe8
[ 212.192169] RBP: ffff8801f283f108 R08: 0000000000000000 R09:
0000000000000000
[ 212.193679] R10: 0000000000000000 R11: 0000441f0f66ffff R12:
ffff8801cf4bc3e8
[ 212.195185] R13: ffff8801cf4bc3f8 R14: ffff8801e0646d80 R15:
ffff8801f283f520
[ 212.196683] FS: 00007f82fc326700(0000) GS:ffff8801f7100000(0000)
knlGS:0000000000000000
[ 212.198365] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 212.199580] CR2: ffff8801da800000 CR3: 00000001f37ac000 CR4:
00000000000006e0
[ 212.201120] Call Trace:
[ 212.201656] ? memmove+0x45/0x50
[ 212.202351] ext4_xattr_set_entry+0x14e2/0x1990
[ 212.203351] ? save_stack+0x46/0xd0
[ 212.204102] ? kasan_kmalloc+0xad/0xe0
[ 212.204896] ? __kmalloc+0x11f/0x240
[ 212.205672] ? ext4_expand_extra_isize_ea+0x532/0xd20
[ 212.206770] ? __ext4_expand_extra_isize+0xd4/0x100
[ 212.207863] ? ext4_mark_inode_dirty+0x3a8/0x3d0
[ 212.208869] ? syscall_return_slowpath+0x80/0xd0
[ 212.209851] ? ext4_xattr_inode_get+0x430/0x430
[ 212.210809] ? __find_get_block+0x106/0x400
[ 212.211724] ? is_bpf_text_address+0xe/0x20
[ 212.212644] ? kernel_text_address+0xd6/0xf0
[ 212.213550] ? _cond_resched+0x1a/0x50
[ 212.214347] ? __getblk_gfp+0x31/0x3f0
[ 212.215169] ? kasan_check_write+0x14/0x20
[ 212.216051] ? _raw_spin_lock_irqsave+0x2a/0x60
[ 212.217019] ? strlen+0xf/0x40
[ 212.217690] ? xattr_find_entry+0x5b/0x140
[ 212.218600] ext4_xattr_ibody_set+0x58/0x120
[ 212.219529] ext4_expand_extra_isize_ea+0x897/0xd20
[ 212.220578] ? ext4_xattr_set+0x200/0x200
[ 212.221483] ? __getblk_gfp+0x31/0x3f0
[ 212.222317] ? mark_page_accessed+0x133/0x200
[ 212.223428] ? kasan_check_write+0x14/0x20
[ 212.224306] __ext4_expand_extra_isize+0xd4/0x100
[ 212.225292] ext4_mark_inode_dirty+0x3a8/0x3d0
[ 212.226260] ? ext4_expand_extra_isize+0x2e0/0x2e0
[ 212.227298] ? kasan_check_write+0x14/0x20
[ 212.228180] ? ext4_add_dirent_to_inline.isra.12+0x206/0x230
[ 212.229389] ? ext4_update_inline_data+0x340/0x340
[ 212.230410] ext4_try_add_inline_entry+0x16f/0x330
[ 212.231686] ? ext4_da_write_inline_data_end+0x110/0x110
[ 212.232750] ext4_add_entry+0x1d9/0x570
[ 212.233536] ? make_indexed_dir+0x940/0x940
[ 212.234391] ? jbd2__journal_start+0x19d/0x300
[ 212.235401] ? __ext4_journal_start_sb+0x89/0x180
[ 212.236364] ext4_rename+0xb01/0xd00
[ 212.237109] ? __x64_sys_rename+0x3b/0x50
[ 212.237933] ? ext4_tmpfile+0x2d0/0x2d0
[ 212.238990] ? ext4_find_entry+0x17d/0x770
[ 212.239852] ? legitimize_path.isra.28+0x61/0xa0
[ 212.240835] ? ext4_dx_find_entry+0x2c0/0x2c0
[ 212.241755] ? kasan_check_write+0x14/0x20
[ 212.242613] ? lockref_get+0xc2/0x140
[ 212.243386] ext4_rename2+0xa6/0x100
[ 212.244122] vfs_rename+0xaa5/0xde0
[ 212.244838] ? memcg_kmem_put_cache+0x55/0xa0
[ 212.245719] ? path_mountpoint+0x5b0/0x5b0
[ 212.246551] ? kasan_check_write+0x14/0x20
[ 212.247403] ? security_path_rename+0xcb/0x130
[ 212.248302] do_renameat2+0x7d2/0x860
[ 212.249049] ? user_path_create+0x40/0x40
[ 212.249866] ? lockref_put_return+0xd0/0x140
[ 212.250731] ? memset+0x31/0x40
[ 212.251398] ? handle_mm_fault+0x24b/0x380
[ 212.252233] ? __fput+0x28d/0x380
[ 212.252916] ? mm_fault_error+0x1f0/0x1f0
[ 212.253738] ? task_work_run+0x4d/0xf0
[ 212.254506] __x64_sys_rename+0x3b/0x50
[ 212.255312] do_syscall_64+0x78/0x170
[ 212.256070] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 212.257095] RIP: 0033:0x7f82fbdac367
[ 212.257825] RSP: 002b:00007ffcc27d23c8 EFLAGS: 00000202 ORIG_RAX:
0000000000000052
[ 212.259350] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
00007f82fbdac367
[ 212.260763] RDX: 0000000001a700a0 RSI: 0000000001a700a0 RDI:
0000000001a70080
[ 212.262177] RBP: 00007ffcc27d2530 R08: 0000000000000003 R09:
0000000000000000
[ 212.265946] R10: 0000000000000640 R11: 0000000000000202 R12:
0000000000400c20
[ 212.267382] R13: 00007ffcc27d2630 R14: 0000000000000000 R15:
0000000000000000
[ 212.268798] Code: 40 38 fe 74 3b 48 83 ea 20 48 83 ea 20 4c 8b 1e 4c 8b 56
08 4c 8b 4e 10 4c 8b 46 18 48 8d 76 20 4c 89 1f 4c 89 57 08 4c 89 4f 10 <4c> 89
47 18 48 8d 7f 20 73 d4 48 83 c2 20 e9 a2 00 00 00 66 90
[ 212.272600] RIP: __memmove+0x5b/0x1a0 RSP: ffff8801f283f0e8
[ 212.273748] CR2: ffff8801da800000
[ 212.274454] ---[ end trace c7e666925cc65cc5 ]---
- Note
This is a different issue from Bugzilla 199347
https://elixir.bootlin.com/linux/v4.18-rc3/source/fs/ext4/xattr.c#L1726
} else if (s->not_found) {
/* Insert new name. */
size_t size = EXT4_XATTR_LEN(name_len);
size_t rest = (void *)last - (void *)here + sizeof(__u32);
memmove((void *)here + size, here, rest);
memset(here, 0, size);
Kernel crashes at memmove with negative length
Reported by Wen Xu (wen.xu@...ech.edu) from SSLab at Gatech.
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