* [syzbot] [crypto?] KMSAN: uninit-value in aes_encrypt (6)
@ 2025-10-11 9:38 syzbot
2025-10-11 14:52 ` Ard Biesheuvel
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2025-10-11 9:38 UTC (permalink / raw)
To: davem, herbert, linux-crypto, linux-kernel, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 917167ed1211 Merge tag 'xtensa-20251010' of https://github..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10f55304580000
kernel config: https://syzkaller.appspot.com/x/.config?x=3b820eb4c6dd8482
dashboard link: https://syzkaller.appspot.com/bug?extid=22bff16a8f91d65e2e58
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
userspace arch: i386
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f8b165efe52b/disk-917167ed.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/01b56300cdc7/vmlinux-917167ed.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6c32d21e8075/bzImage-917167ed.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+22bff16a8f91d65e2e58@syzkaller.appspotmail.com
EXT4-fs error (device loop5): ext4_orphan_get:1418: comm syz.5.10451: bad orphan inode 131083
EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
=====================================================
BUG: KMSAN: uninit-value in subshift lib/crypto/aes.c:150 [inline]
BUG: KMSAN: uninit-value in aes_encrypt+0x1239/0x1960 lib/crypto/aes.c:283
subshift lib/crypto/aes.c:150 [inline]
aes_encrypt+0x1239/0x1960 lib/crypto/aes.c:283
aesti_encrypt+0x7d/0xf0 crypto/aes_ti.c:31
crypto_ecb_crypt crypto/ecb.c:23 [inline]
crypto_ecb_encrypt2+0x13f/0x300 crypto/ecb.c:40
crypto_lskcipher_crypt_sg+0x3a9/0x930 crypto/lskcipher.c:188
crypto_lskcipher_encrypt_sg+0x8b/0xc0 crypto/lskcipher.c:207
crypto_skcipher_encrypt+0x111/0x1e0 crypto/skcipher.c:194
xts_encrypt+0x2e1/0x570 crypto/xts.c:269
crypto_skcipher_encrypt+0x187/0x1e0 crypto/skcipher.c:195
fscrypt_crypt_data_unit+0x38e/0x590 fs/crypto/crypto.c:139
fscrypt_encrypt_pagecache_blocks+0x430/0x900 fs/crypto/crypto.c:197
ext4_bio_write_folio+0x1383/0x30d0 fs/ext4/page-io.c:552
mpage_submit_folio fs/ext4/inode.c:2080 [inline]
mpage_process_page_bufs+0xf1b/0x13e0 fs/ext4/inode.c:2191
mpage_prepare_extent_to_map+0x1792/0x2a10 fs/ext4/inode.c:2736
ext4_do_writepages+0x11b6/0x8020 fs/ext4/inode.c:2877
ext4_writepages+0x338/0x870 fs/ext4/inode.c:3025
do_writepages+0x3ef/0x860 mm/page-writeback.c:2604
filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
__filemap_fdatawrite_range mm/filemap.c:422 [inline]
file_write_and_wait_range+0x6f0/0x7d0 mm/filemap.c:797
generic_buffers_fsync_noflush+0x79/0x3c0 fs/buffer.c:609
ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
ext4_sync_file+0x587/0x12f0 fs/ext4/fsync.c:147
vfs_fsync_range+0x1a1/0x240 fs/sync.c:187
generic_write_sync include/linux/fs.h:3046 [inline]
ext4_buffered_write_iter+0xae9/0xce0 fs/ext4/file.c:305
ext4_file_write_iter+0x2a2/0x3d90 fs/ext4/file.c:-1
do_iter_readv_writev+0x9de/0xc20 fs/read_write.c:-1
vfs_writev+0x52a/0x1500 fs/read_write.c:1057
do_pwritev fs/read_write.c:1153 [inline]
__do_compat_sys_pwritev2 fs/read_write.c:1298 [inline]
__se_compat_sys_pwritev2 fs/read_write.c:1290 [inline]
__ia32_compat_sys_pwritev2+0x43d/0x6b0 fs/read_write.c:1290
ia32_sys_call+0x1810/0x4310 arch/x86/include/generated/asm/syscalls_32.h:380
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
Uninit was stored to memory at:
le128_xor include/crypto/b128ops.h:69 [inline]
xts_xor_tweak+0x566/0xbd0 crypto/xts.c:123
xts_xor_tweak_pre crypto/xts.c:135 [inline]
xts_encrypt+0x278/0x570 crypto/xts.c:268
crypto_skcipher_encrypt+0x187/0x1e0 crypto/skcipher.c:195
fscrypt_crypt_data_unit+0x38e/0x590 fs/crypto/crypto.c:139
fscrypt_encrypt_pagecache_blocks+0x430/0x900 fs/crypto/crypto.c:197
ext4_bio_write_folio+0x1383/0x30d0 fs/ext4/page-io.c:552
mpage_submit_folio fs/ext4/inode.c:2080 [inline]
mpage_process_page_bufs+0xf1b/0x13e0 fs/ext4/inode.c:2191
mpage_prepare_extent_to_map+0x1792/0x2a10 fs/ext4/inode.c:2736
ext4_do_writepages+0x11b6/0x8020 fs/ext4/inode.c:2877
ext4_writepages+0x338/0x870 fs/ext4/inode.c:3025
do_writepages+0x3ef/0x860 mm/page-writeback.c:2604
filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
__filemap_fdatawrite_range mm/filemap.c:422 [inline]
file_write_and_wait_range+0x6f0/0x7d0 mm/filemap.c:797
generic_buffers_fsync_noflush+0x79/0x3c0 fs/buffer.c:609
ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
ext4_sync_file+0x587/0x12f0 fs/ext4/fsync.c:147
vfs_fsync_range+0x1a1/0x240 fs/sync.c:187
generic_write_sync include/linux/fs.h:3046 [inline]
ext4_buffered_write_iter+0xae9/0xce0 fs/ext4/file.c:305
ext4_file_write_iter+0x2a2/0x3d90 fs/ext4/file.c:-1
do_iter_readv_writev+0x9de/0xc20 fs/read_write.c:-1
vfs_writev+0x52a/0x1500 fs/read_write.c:1057
do_pwritev fs/read_write.c:1153 [inline]
__do_compat_sys_pwritev2 fs/read_write.c:1298 [inline]
__se_compat_sys_pwritev2 fs/read_write.c:1290 [inline]
__ia32_compat_sys_pwritev2+0x43d/0x6b0 fs/read_write.c:1290
ia32_sys_call+0x1810/0x4310 arch/x86/include/generated/asm/syscalls_32.h:380
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
Uninit was created at:
__alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:5206
alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2416
alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
alloc_pages_noprof mm/mempolicy.c:2507 [inline]
folio_alloc_noprof+0x109/0x360 mm/mempolicy.c:2517
filemap_alloc_folio_noprof+0x9d/0x420 mm/filemap.c:1020
__filemap_get_folio+0xb45/0x1930 mm/filemap.c:2012
write_begin_get_folio include/linux/pagemap.h:784 [inline]
ext4_write_begin+0x6d9/0x2d70 fs/ext4/inode.c:1318
generic_perform_write+0x362/0x1050 mm/filemap.c:4242
ext4_buffered_write_iter+0x61a/0xce0 fs/ext4/file.c:299
ext4_file_write_iter+0x2a2/0x3d90 fs/ext4/file.c:-1
do_iter_readv_writev+0x9de/0xc20 fs/read_write.c:-1
vfs_writev+0x52a/0x1500 fs/read_write.c:1057
do_pwritev fs/read_write.c:1153 [inline]
__do_compat_sys_pwritev2 fs/read_write.c:1298 [inline]
__se_compat_sys_pwritev2 fs/read_write.c:1290 [inline]
__ia32_compat_sys_pwritev2+0x43d/0x6b0 fs/read_write.c:1290
ia32_sys_call+0x1810/0x4310 arch/x86/include/generated/asm/syscalls_32.h:380
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
CPU: 1 UID: 0 PID: 8113 Comm: syz.5.10451 Tainted: G W syzkaller #0 PREEMPT(none)
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
=====================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [crypto?] KMSAN: uninit-value in aes_encrypt (6)
2025-10-11 9:38 [syzbot] [crypto?] KMSAN: uninit-value in aes_encrypt (6) syzbot
@ 2025-10-11 14:52 ` Ard Biesheuvel
2025-10-14 14:57 ` Aleksandr Nogikh
0 siblings, 1 reply; 3+ messages in thread
From: Ard Biesheuvel @ 2025-10-11 14:52 UTC (permalink / raw)
To: syzbot; +Cc: davem, herbert, linux-crypto, linux-kernel, syzkaller-bugs
#syz set subsystems: ext4, fscrypt
On Sat, 11 Oct 2025 at 02:38, syzbot
<syzbot+22bff16a8f91d65e2e58@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 917167ed1211 Merge tag 'xtensa-20251010' of https://github..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=10f55304580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=3b820eb4c6dd8482
> dashboard link: https://syzkaller.appspot.com/bug?extid=22bff16a8f91d65e2e58
> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> userspace arch: i386
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/f8b165efe52b/disk-917167ed.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/01b56300cdc7/vmlinux-917167ed.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/6c32d21e8075/bzImage-917167ed.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+22bff16a8f91d65e2e58@syzkaller.appspotmail.com
>
> EXT4-fs error (device loop5): ext4_orphan_get:1418: comm syz.5.10451: bad orphan inode 131083
> EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
> =====================================================
> BUG: KMSAN: uninit-value in subshift lib/crypto/aes.c:150 [inline]
> BUG: KMSAN: uninit-value in aes_encrypt+0x1239/0x1960 lib/crypto/aes.c:283
> subshift lib/crypto/aes.c:150 [inline]
> aes_encrypt+0x1239/0x1960 lib/crypto/aes.c:283
> aesti_encrypt+0x7d/0xf0 crypto/aes_ti.c:31
> crypto_ecb_crypt crypto/ecb.c:23 [inline]
> crypto_ecb_encrypt2+0x13f/0x300 crypto/ecb.c:40
> crypto_lskcipher_crypt_sg+0x3a9/0x930 crypto/lskcipher.c:188
> crypto_lskcipher_encrypt_sg+0x8b/0xc0 crypto/lskcipher.c:207
> crypto_skcipher_encrypt+0x111/0x1e0 crypto/skcipher.c:194
> xts_encrypt+0x2e1/0x570 crypto/xts.c:269
> crypto_skcipher_encrypt+0x187/0x1e0 crypto/skcipher.c:195
> fscrypt_crypt_data_unit+0x38e/0x590 fs/crypto/crypto.c:139
> fscrypt_encrypt_pagecache_blocks+0x430/0x900 fs/crypto/crypto.c:197
> ext4_bio_write_folio+0x1383/0x30d0 fs/ext4/page-io.c:552
> mpage_submit_folio fs/ext4/inode.c:2080 [inline]
> mpage_process_page_bufs+0xf1b/0x13e0 fs/ext4/inode.c:2191
> mpage_prepare_extent_to_map+0x1792/0x2a10 fs/ext4/inode.c:2736
> ext4_do_writepages+0x11b6/0x8020 fs/ext4/inode.c:2877
> ext4_writepages+0x338/0x870 fs/ext4/inode.c:3025
> do_writepages+0x3ef/0x860 mm/page-writeback.c:2604
> filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
> __filemap_fdatawrite_range mm/filemap.c:422 [inline]
> file_write_and_wait_range+0x6f0/0x7d0 mm/filemap.c:797
> generic_buffers_fsync_noflush+0x79/0x3c0 fs/buffer.c:609
> ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
> ext4_sync_file+0x587/0x12f0 fs/ext4/fsync.c:147
> vfs_fsync_range+0x1a1/0x240 fs/sync.c:187
> generic_write_sync include/linux/fs.h:3046 [inline]
> ext4_buffered_write_iter+0xae9/0xce0 fs/ext4/file.c:305
> ext4_file_write_iter+0x2a2/0x3d90 fs/ext4/file.c:-1
> do_iter_readv_writev+0x9de/0xc20 fs/read_write.c:-1
> vfs_writev+0x52a/0x1500 fs/read_write.c:1057
> do_pwritev fs/read_write.c:1153 [inline]
> __do_compat_sys_pwritev2 fs/read_write.c:1298 [inline]
> __se_compat_sys_pwritev2 fs/read_write.c:1290 [inline]
> __ia32_compat_sys_pwritev2+0x43d/0x6b0 fs/read_write.c:1290
> ia32_sys_call+0x1810/0x4310 arch/x86/include/generated/asm/syscalls_32.h:380
> do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
> __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
> do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
> do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
> entry_SYSENTER_compat_after_hwframe+0x84/0x8e
>
> Uninit was stored to memory at:
> le128_xor include/crypto/b128ops.h:69 [inline]
> xts_xor_tweak+0x566/0xbd0 crypto/xts.c:123
> xts_xor_tweak_pre crypto/xts.c:135 [inline]
> xts_encrypt+0x278/0x570 crypto/xts.c:268
> crypto_skcipher_encrypt+0x187/0x1e0 crypto/skcipher.c:195
> fscrypt_crypt_data_unit+0x38e/0x590 fs/crypto/crypto.c:139
> fscrypt_encrypt_pagecache_blocks+0x430/0x900 fs/crypto/crypto.c:197
> ext4_bio_write_folio+0x1383/0x30d0 fs/ext4/page-io.c:552
> mpage_submit_folio fs/ext4/inode.c:2080 [inline]
> mpage_process_page_bufs+0xf1b/0x13e0 fs/ext4/inode.c:2191
> mpage_prepare_extent_to_map+0x1792/0x2a10 fs/ext4/inode.c:2736
> ext4_do_writepages+0x11b6/0x8020 fs/ext4/inode.c:2877
> ext4_writepages+0x338/0x870 fs/ext4/inode.c:3025
> do_writepages+0x3ef/0x860 mm/page-writeback.c:2604
> filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
> __filemap_fdatawrite_range mm/filemap.c:422 [inline]
> file_write_and_wait_range+0x6f0/0x7d0 mm/filemap.c:797
> generic_buffers_fsync_noflush+0x79/0x3c0 fs/buffer.c:609
> ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
> ext4_sync_file+0x587/0x12f0 fs/ext4/fsync.c:147
> vfs_fsync_range+0x1a1/0x240 fs/sync.c:187
> generic_write_sync include/linux/fs.h:3046 [inline]
> ext4_buffered_write_iter+0xae9/0xce0 fs/ext4/file.c:305
> ext4_file_write_iter+0x2a2/0x3d90 fs/ext4/file.c:-1
> do_iter_readv_writev+0x9de/0xc20 fs/read_write.c:-1
> vfs_writev+0x52a/0x1500 fs/read_write.c:1057
> do_pwritev fs/read_write.c:1153 [inline]
> __do_compat_sys_pwritev2 fs/read_write.c:1298 [inline]
> __se_compat_sys_pwritev2 fs/read_write.c:1290 [inline]
> __ia32_compat_sys_pwritev2+0x43d/0x6b0 fs/read_write.c:1290
> ia32_sys_call+0x1810/0x4310 arch/x86/include/generated/asm/syscalls_32.h:380
> do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
> __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
> do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
> do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
> entry_SYSENTER_compat_after_hwframe+0x84/0x8e
>
> Uninit was created at:
> __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:5206
> alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2416
> alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
> alloc_pages_noprof mm/mempolicy.c:2507 [inline]
> folio_alloc_noprof+0x109/0x360 mm/mempolicy.c:2517
> filemap_alloc_folio_noprof+0x9d/0x420 mm/filemap.c:1020
> __filemap_get_folio+0xb45/0x1930 mm/filemap.c:2012
> write_begin_get_folio include/linux/pagemap.h:784 [inline]
> ext4_write_begin+0x6d9/0x2d70 fs/ext4/inode.c:1318
> generic_perform_write+0x362/0x1050 mm/filemap.c:4242
> ext4_buffered_write_iter+0x61a/0xce0 fs/ext4/file.c:299
> ext4_file_write_iter+0x2a2/0x3d90 fs/ext4/file.c:-1
> do_iter_readv_writev+0x9de/0xc20 fs/read_write.c:-1
> vfs_writev+0x52a/0x1500 fs/read_write.c:1057
> do_pwritev fs/read_write.c:1153 [inline]
> __do_compat_sys_pwritev2 fs/read_write.c:1298 [inline]
> __se_compat_sys_pwritev2 fs/read_write.c:1290 [inline]
> __ia32_compat_sys_pwritev2+0x43d/0x6b0 fs/read_write.c:1290
> ia32_sys_call+0x1810/0x4310 arch/x86/include/generated/asm/syscalls_32.h:380
> do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
> __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
> do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
> do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
> entry_SYSENTER_compat_after_hwframe+0x84/0x8e
>
> CPU: 1 UID: 0 PID: 8113 Comm: syz.5.10451 Tainted: G W syzkaller #0 PREEMPT(none)
> Tainted: [W]=WARN
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
> =====================================================
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [crypto?] KMSAN: uninit-value in aes_encrypt (6)
2025-10-11 14:52 ` Ard Biesheuvel
@ 2025-10-14 14:57 ` Aleksandr Nogikh
0 siblings, 0 replies; 3+ messages in thread
From: Aleksandr Nogikh @ 2025-10-14 14:57 UTC (permalink / raw)
To: Ard Biesheuvel
Cc: syzbot, davem, herbert, linux-crypto, linux-kernel,
syzkaller-bugs
#syz dup: KMSAN: uninit-value in fscrypt_crypt_data_unit
On Sat, Oct 11, 2025 at 4:53 PM 'Ard Biesheuvel' via syzkaller-bugs
<syzkaller-bugs@googlegroups.com> wrote:
>
> #syz set subsystems: ext4, fscrypt
>
> On Sat, 11 Oct 2025 at 02:38, syzbot
> <syzbot+22bff16a8f91d65e2e58@syzkaller.appspotmail.com> wrote:
> >
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit: 917167ed1211 Merge tag 'xtensa-20251010' of https://github..
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=10f55304580000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=3b820eb4c6dd8482
> > dashboard link: https://syzkaller.appspot.com/bug?extid=22bff16a8f91d65e2e58
> > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> > userspace arch: i386
> >
> > Unfortunately, I don't have any reproducer for this issue yet.
> >
> > Downloadable assets:
> > disk image: https://storage.googleapis.com/syzbot-assets/f8b165efe52b/disk-917167ed.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/01b56300cdc7/vmlinux-917167ed.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/6c32d21e8075/bzImage-917167ed.xz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+22bff16a8f91d65e2e58@syzkaller.appspotmail.com
> >
> > EXT4-fs error (device loop5): ext4_orphan_get:1418: comm syz.5.10451: bad orphan inode 131083
> > EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
> > =====================================================
> > BUG: KMSAN: uninit-value in subshift lib/crypto/aes.c:150 [inline]
> > BUG: KMSAN: uninit-value in aes_encrypt+0x1239/0x1960 lib/crypto/aes.c:283
> > subshift lib/crypto/aes.c:150 [inline]
> > aes_encrypt+0x1239/0x1960 lib/crypto/aes.c:283
> > aesti_encrypt+0x7d/0xf0 crypto/aes_ti.c:31
> > crypto_ecb_crypt crypto/ecb.c:23 [inline]
> > crypto_ecb_encrypt2+0x13f/0x300 crypto/ecb.c:40
> > crypto_lskcipher_crypt_sg+0x3a9/0x930 crypto/lskcipher.c:188
> > crypto_lskcipher_encrypt_sg+0x8b/0xc0 crypto/lskcipher.c:207
> > crypto_skcipher_encrypt+0x111/0x1e0 crypto/skcipher.c:194
> > xts_encrypt+0x2e1/0x570 crypto/xts.c:269
> > crypto_skcipher_encrypt+0x187/0x1e0 crypto/skcipher.c:195
> > fscrypt_crypt_data_unit+0x38e/0x590 fs/crypto/crypto.c:139
> > fscrypt_encrypt_pagecache_blocks+0x430/0x900 fs/crypto/crypto.c:197
> > ext4_bio_write_folio+0x1383/0x30d0 fs/ext4/page-io.c:552
> > mpage_submit_folio fs/ext4/inode.c:2080 [inline]
> > mpage_process_page_bufs+0xf1b/0x13e0 fs/ext4/inode.c:2191
> > mpage_prepare_extent_to_map+0x1792/0x2a10 fs/ext4/inode.c:2736
> > ext4_do_writepages+0x11b6/0x8020 fs/ext4/inode.c:2877
> > ext4_writepages+0x338/0x870 fs/ext4/inode.c:3025
> > do_writepages+0x3ef/0x860 mm/page-writeback.c:2604
> > filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
> > __filemap_fdatawrite_range mm/filemap.c:422 [inline]
> > file_write_and_wait_range+0x6f0/0x7d0 mm/filemap.c:797
> > generic_buffers_fsync_noflush+0x79/0x3c0 fs/buffer.c:609
> > ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
> > ext4_sync_file+0x587/0x12f0 fs/ext4/fsync.c:147
> > vfs_fsync_range+0x1a1/0x240 fs/sync.c:187
> > generic_write_sync include/linux/fs.h:3046 [inline]
> > ext4_buffered_write_iter+0xae9/0xce0 fs/ext4/file.c:305
> > ext4_file_write_iter+0x2a2/0x3d90 fs/ext4/file.c:-1
> > do_iter_readv_writev+0x9de/0xc20 fs/read_write.c:-1
> > vfs_writev+0x52a/0x1500 fs/read_write.c:1057
> > do_pwritev fs/read_write.c:1153 [inline]
> > __do_compat_sys_pwritev2 fs/read_write.c:1298 [inline]
> > __se_compat_sys_pwritev2 fs/read_write.c:1290 [inline]
> > __ia32_compat_sys_pwritev2+0x43d/0x6b0 fs/read_write.c:1290
> > ia32_sys_call+0x1810/0x4310 arch/x86/include/generated/asm/syscalls_32.h:380
> > do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
> > __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
> > do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
> > do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
> > entry_SYSENTER_compat_after_hwframe+0x84/0x8e
> >
> > Uninit was stored to memory at:
> > le128_xor include/crypto/b128ops.h:69 [inline]
> > xts_xor_tweak+0x566/0xbd0 crypto/xts.c:123
> > xts_xor_tweak_pre crypto/xts.c:135 [inline]
> > xts_encrypt+0x278/0x570 crypto/xts.c:268
> > crypto_skcipher_encrypt+0x187/0x1e0 crypto/skcipher.c:195
> > fscrypt_crypt_data_unit+0x38e/0x590 fs/crypto/crypto.c:139
> > fscrypt_encrypt_pagecache_blocks+0x430/0x900 fs/crypto/crypto.c:197
> > ext4_bio_write_folio+0x1383/0x30d0 fs/ext4/page-io.c:552
> > mpage_submit_folio fs/ext4/inode.c:2080 [inline]
> > mpage_process_page_bufs+0xf1b/0x13e0 fs/ext4/inode.c:2191
> > mpage_prepare_extent_to_map+0x1792/0x2a10 fs/ext4/inode.c:2736
> > ext4_do_writepages+0x11b6/0x8020 fs/ext4/inode.c:2877
> > ext4_writepages+0x338/0x870 fs/ext4/inode.c:3025
> > do_writepages+0x3ef/0x860 mm/page-writeback.c:2604
> > filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
> > __filemap_fdatawrite_range mm/filemap.c:422 [inline]
> > file_write_and_wait_range+0x6f0/0x7d0 mm/filemap.c:797
> > generic_buffers_fsync_noflush+0x79/0x3c0 fs/buffer.c:609
> > ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
> > ext4_sync_file+0x587/0x12f0 fs/ext4/fsync.c:147
> > vfs_fsync_range+0x1a1/0x240 fs/sync.c:187
> > generic_write_sync include/linux/fs.h:3046 [inline]
> > ext4_buffered_write_iter+0xae9/0xce0 fs/ext4/file.c:305
> > ext4_file_write_iter+0x2a2/0x3d90 fs/ext4/file.c:-1
> > do_iter_readv_writev+0x9de/0xc20 fs/read_write.c:-1
> > vfs_writev+0x52a/0x1500 fs/read_write.c:1057
> > do_pwritev fs/read_write.c:1153 [inline]
> > __do_compat_sys_pwritev2 fs/read_write.c:1298 [inline]
> > __se_compat_sys_pwritev2 fs/read_write.c:1290 [inline]
> > __ia32_compat_sys_pwritev2+0x43d/0x6b0 fs/read_write.c:1290
> > ia32_sys_call+0x1810/0x4310 arch/x86/include/generated/asm/syscalls_32.h:380
> > do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
> > __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
> > do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
> > do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
> > entry_SYSENTER_compat_after_hwframe+0x84/0x8e
> >
> > Uninit was created at:
> > __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:5206
> > alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2416
> > alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
> > alloc_pages_noprof mm/mempolicy.c:2507 [inline]
> > folio_alloc_noprof+0x109/0x360 mm/mempolicy.c:2517
> > filemap_alloc_folio_noprof+0x9d/0x420 mm/filemap.c:1020
> > __filemap_get_folio+0xb45/0x1930 mm/filemap.c:2012
> > write_begin_get_folio include/linux/pagemap.h:784 [inline]
> > ext4_write_begin+0x6d9/0x2d70 fs/ext4/inode.c:1318
> > generic_perform_write+0x362/0x1050 mm/filemap.c:4242
> > ext4_buffered_write_iter+0x61a/0xce0 fs/ext4/file.c:299
> > ext4_file_write_iter+0x2a2/0x3d90 fs/ext4/file.c:-1
> > do_iter_readv_writev+0x9de/0xc20 fs/read_write.c:-1
> > vfs_writev+0x52a/0x1500 fs/read_write.c:1057
> > do_pwritev fs/read_write.c:1153 [inline]
> > __do_compat_sys_pwritev2 fs/read_write.c:1298 [inline]
> > __se_compat_sys_pwritev2 fs/read_write.c:1290 [inline]
> > __ia32_compat_sys_pwritev2+0x43d/0x6b0 fs/read_write.c:1290
> > ia32_sys_call+0x1810/0x4310 arch/x86/include/generated/asm/syscalls_32.h:380
> > do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
> > __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
> > do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
> > do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
> > entry_SYSENTER_compat_after_hwframe+0x84/0x8e
> >
> > CPU: 1 UID: 0 PID: 8113 Comm: syz.5.10451 Tainted: G W syzkaller #0 PREEMPT(none)
> > Tainted: [W]=WARN
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
> > =====================================================
> >
> >
> > ---
> > This report is generated by a bot. It may contain errors.
> > See https://goo.gl/tpsmEJ for more information about syzbot.
> > syzbot engineers can be reached at syzkaller@googlegroups.com.
> >
> > syzbot will keep track of this issue. See:
> > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> >
> > If the report is already addressed, let syzbot know by replying with:
> > #syz fix: exact-commit-title
> >
> > If you want to overwrite report's subsystems, reply with:
> > #syz set subsystems: new-subsystem
> > (See the list of subsystem names on the web dashboard)
> >
> > If the report is a duplicate of another one, reply with:
> > #syz dup: exact-subject-of-another-report
> >
> > If you want to undo deduplication, reply with:
> > #syz undup
> >
>
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2025-10-11 9:38 [syzbot] [crypto?] KMSAN: uninit-value in aes_encrypt (6) syzbot
2025-10-11 14:52 ` Ard Biesheuvel
2025-10-14 14:57 ` Aleksandr Nogikh
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