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Date: Thu, 30 May 2024 12:31:24 +0800 From: Herbert Xu <herbert@...dor.apana.org.au> To: syzbot <syzbot+aeb14e2539ffb6d21130@...kaller.appspotmail.com> Cc: davem@...emloft.net, linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, Theodore Ts'o <tytso@....edu>, Andreas Dilger <adilger.kernel@...ger.ca>, linux-ext4@...r.kernel.org, Eric Biggers <ebiggers@...nel.org>, Jaegeuk Kim <jaegeuk@...nel.org>, linux-fscrypt@...r.kernel.org Subject: Re: [syzbot] [crypto?] KMSAN: uninit-value in aes_encrypt (5) On Thu, May 09, 2024 at 09:02:27PM -0700, syzbot wrote: > syzbot has found a reproducer for the following issue on: > > HEAD commit: 45db3ab70092 Merge tag '6.9-rc7-ksmbd-fixes' of git://git... > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=14d9bfdf180000 > kernel config: https://syzkaller.appspot.com/x/.config?x=617171361dd3cd47 > dashboard link: https://syzkaller.appspot.com/bug?extid=aeb14e2539ffb6d21130 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1617adb8980000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=112f45d4980000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/232e7c2a73a5/disk-45db3ab7.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/7e9bf7c936ab/vmlinux-45db3ab7.xz > kernel image: https://storage.googleapis.com/syzbot-assets/5e8f98ee02d8/bzImage-45db3ab7.xz > mounted in repro: https://storage.googleapis.com/syzbot-assets/fcc88c919ed9/mount_1.gz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+aeb14e2539ffb6d21130@...kaller.appspotmail.com > > 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 > ===================================================== > > > --- > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. #syz set subsystems: ext4 These reports have been coming in for a while, previously they were merged incorrectly with reports coming from networking, see for example: https://syzkaller.appspot.com/bug?id=6eb713b7107c62e9f6c259adf944c96efc3cd524 https://syzkaller.appspot.com/text?tag=CrashReport&x=11e16a77a80000 The networking bug disappeared mysteriously in July 2023. Thanks, -- Email: Herbert Xu <herbert@...dor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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