syzbot


KMSAN: uninit-value in aes_encrypt (5)

Status: upstream: reported C repro on 2024/04/28 10:32
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+aeb14e2539ffb6d21130@syzkaller.appspotmail.com
First crash: 55d, last: 5d09h
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] fs/ext4: Prevent encryption/decryption of unaligned blocks in aes_encrypt 1 (1) 2024/06/13 13:48
[syzbot] [crypto?] KMSAN: uninit-value in aes_encrypt (5) 1 (8) 2024/06/06 09:15
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in aes_encrypt crypto C 2 2263d 2263d 0/27 closed as invalid on 2018/06/27 14:58
upstream KMSAN: uninit-value in aes_encrypt (4) net C 15041 161d 1376d 0/27 auto-obsoleted due to no activity on 2024/03/19 00:25
upstream KMSAN: uninit-value in aes_encrypt (2) crypto C 52 1669d 1698d 0/27 closed as dup on 2019/11/19 02:55
upstream KMSAN: uninit-value in aes_encrypt (3) crypto C 2 1430d 1431d 0/27 closed as invalid on 2020/07/22 14:12
Last patch testing requests (5)
Created Duration User Patch Repo Result
2024/06/06 09:15 1h46m norkam41@gmail.com https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 45db3ab70092637967967bfd8e6144017638563c report log
2024/06/06 08:27 25m norkam41@gmail.com upstream error OK
2024/06/06 07:57 18m norkam41@gmail.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 45db3ab70092637967967bfd8e6144017638563c report log
2024/06/06 06:15 18m norkam41@gmail.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 45db3ab70092637967967bfd8e6144017638563c report log
2024/06/05 20:17 28m norkam41@gmail.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 45db3ab70092637967967bfd8e6144017638563c report log

Sample crash report:
fscrypt: AES-256-XTS using implementation "xts(ecb(aes-fixed-time))"
=====================================================
BUG: KMSAN: uninit-value in subshift lib/crypto/aes.c:149 [inline]
BUG: KMSAN: uninit-value in aes_encrypt+0x15cc/0x1db0 lib/crypto/aes.c:282
 subshift lib/crypto/aes.c:149 [inline]
 aes_encrypt+0x15cc/0x1db0 lib/crypto/aes.c:282
 aesti_encrypt+0x7d/0xf0 crypto/aes_ti.c:31
 crypto_ecb_crypt crypto/ecb.c:23 [inline]
 crypto_ecb_encrypt2+0x18a/0x300 crypto/ecb.c:40
 crypto_lskcipher_crypt_sg+0x36b/0x7f0 crypto/lskcipher.c:228
 crypto_lskcipher_encrypt_sg+0x8a/0xc0 crypto/lskcipher.c:247
 crypto_skcipher_encrypt+0x119/0x1e0 crypto/skcipher.c:669
 xts_encrypt+0x3c4/0x550 crypto/xts.c:269
 crypto_skcipher_encrypt+0x1a0/0x1e0 crypto/skcipher.c:671
 fscrypt_crypt_data_unit+0x4ee/0x8f0 fs/crypto/crypto.c:144
 fscrypt_encrypt_pagecache_blocks+0x422/0x900 fs/crypto/crypto.c:207
 ext4_bio_write_folio+0x13db/0x2e40 fs/ext4/page-io.c:526
 mpage_submit_folio+0x351/0x4a0 fs/ext4/inode.c:1869
 mpage_process_page_bufs+0xb92/0xe30 fs/ext4/inode.c:1982
 mpage_prepare_extent_to_map+0x1702/0x22c0 fs/ext4/inode.c:2490
 ext4_do_writepages+0x1117/0x62e0 fs/ext4/inode.c:2632
 ext4_writepages+0x312/0x830 fs/ext4/inode.c:2768
 do_writepages+0x427/0xc30 mm/page-writeback.c:2612
 filemap_fdatawrite_wbc+0x1d8/0x270 mm/filemap.c:397
 __filemap_fdatawrite_range mm/filemap.c:430 [inline]
 file_write_and_wait_range+0x1bf/0x370 mm/filemap.c:788
 generic_buffers_fsync_noflush+0x84/0x3e0 fs/buffer.c:602
 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
 ext4_sync_file+0x5ba/0x13a0 fs/ext4/fsync.c:151
 vfs_fsync_range+0x20d/0x270 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2795 [inline]
 ext4_buffered_write_iter+0x9ad/0xaa0 fs/ext4/file.c:305
 ext4_file_write_iter+0x208/0x3450
 call_write_iter include/linux/fs.h:2110 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xb63/0x1520 fs/read_write.c:590
 ksys_write+0x20f/0x4c0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:652
 x64_sys_call+0x3062/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 le128_xor include/crypto/b128ops.h:69 [inline]
 xts_xor_tweak+0x4ae/0xbf0 crypto/xts.c:123
 xts_xor_tweak_pre crypto/xts.c:135 [inline]
 xts_encrypt+0x296/0x550 crypto/xts.c:268
 crypto_skcipher_encrypt+0x1a0/0x1e0 crypto/skcipher.c:671
 fscrypt_crypt_data_unit+0x4ee/0x8f0 fs/crypto/crypto.c:144
 fscrypt_encrypt_pagecache_blocks+0x422/0x900 fs/crypto/crypto.c:207
 ext4_bio_write_folio+0x13db/0x2e40 fs/ext4/page-io.c:526
 mpage_submit_folio+0x351/0x4a0 fs/ext4/inode.c:1869
 mpage_process_page_bufs+0xb92/0xe30 fs/ext4/inode.c:1982
 mpage_prepare_extent_to_map+0x1702/0x22c0 fs/ext4/inode.c:2490
 ext4_do_writepages+0x1117/0x62e0 fs/ext4/inode.c:2632
 ext4_writepages+0x312/0x830 fs/ext4/inode.c:2768
 do_writepages+0x427/0xc30 mm/page-writeback.c:2612
 filemap_fdatawrite_wbc+0x1d8/0x270 mm/filemap.c:397
 __filemap_fdatawrite_range mm/filemap.c:430 [inline]
 file_write_and_wait_range+0x1bf/0x370 mm/filemap.c:788
 generic_buffers_fsync_noflush+0x84/0x3e0 fs/buffer.c:602
 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
 ext4_sync_file+0x5ba/0x13a0 fs/ext4/fsync.c:151
 vfs_fsync_range+0x20d/0x270 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2795 [inline]
 ext4_buffered_write_iter+0x9ad/0xaa0 fs/ext4/file.c:305
 ext4_file_write_iter+0x208/0x3450
 call_write_iter include/linux/fs.h:2110 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xb63/0x1520 fs/read_write.c:590
 ksys_write+0x20f/0x4c0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:652
 x64_sys_call+0x3062/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598
 alloc_pages_mpol+0x299/0x990 mm/mempolicy.c:2264
 alloc_pages mm/mempolicy.c:2335 [inline]
 folio_alloc+0x1d0/0x230 mm/mempolicy.c:2342
 filemap_alloc_folio+0xa6/0x440 mm/filemap.c:984
 __filemap_get_folio+0xa10/0x14b0 mm/filemap.c:1926
 ext4_write_begin+0x3e5/0x2230 fs/ext4/inode.c:1159
 generic_perform_write+0x400/0xc60 mm/filemap.c:3974
 ext4_buffered_write_iter+0x564/0xaa0 fs/ext4/file.c:299
 ext4_file_write_iter+0x208/0x3450
 call_write_iter include/linux/fs.h:2110 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xb63/0x1520 fs/read_write.c:590
 ksys_write+0x20f/0x4c0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:652
 x64_sys_call+0x3062/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 PID: 5048 Comm: syz-executor132 Not tainted 6.9.0-rc7-syzkaller-00056-g45db3ab70092 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
=====================================================

Crashes (23):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/10 04:01 upstream 45db3ab70092 de979bc2 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/06/13 03:13 upstream 614da38e2f7a 2aa5052f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/06/13 03:13 upstream 614da38e2f7a 2aa5052f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/06/11 13:20 upstream 614da38e2f7a c7d7d815 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/06/11 13:19 upstream 614da38e2f7a c7d7d815 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/06/11 13:19 upstream 614da38e2f7a c7d7d815 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/06/10 18:43 upstream 614da38e2f7a 048c640a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/05/31 07:37 upstream 614da38e2f7a 34889ee3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/05/27 10:37 upstream 614da38e2f7a a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/05/24 01:26 upstream 614da38e2f7a 8f98448e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/05/14 01:51 upstream cd97950cbcab fdb4c10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/05/13 15:16 upstream a38297e3fb01 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/05/09 20:18 upstream 45db3ab70092 de979bc2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/05/03 16:20 upstream f03359bca01b 375d4445 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/04/28 09:48 upstream 5d12ed4bea43 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/04/24 10:25 upstream 9d1ddab261f3 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in aes_encrypt
2024/06/12 12:15 upstream 101b7a97143a 4d75f4f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in aes_encrypt
2024/06/08 11:05 upstream 101b7a97143a 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in aes_encrypt
2024/05/20 10:56 upstream 101b7a97143a c0f1611a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in aes_encrypt
2024/05/15 12:03 upstream 101b7a97143a fdb4c10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in aes_encrypt
2024/05/05 05:54 upstream 7367539ad4b0 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in aes_encrypt
2024/05/02 21:59 upstream 49a73b1652c5 ddfc15a1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in aes_encrypt
2024/04/30 12:47 upstream 98369dccd2f8 27e33c58 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in aes_encrypt
* Struck through repros no longer work on HEAD.