linux-kernel - KMSAN: uninit-value in aes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <00000000000065ef5f0595aafe71@google.com>
Date:   Thu, 24 Oct 2019 10:02:08 -0700
From:   syzbot <syzbot+9e3b178624a8a2f8fa28@...kaller.appspotmail.com>
To:     davem@...emloft.net, glider@...gle.com,
        herbert@...dor.apana.org.au, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: KMSAN: uninit-value in aes_encrypt (2)

Hello,

syzbot found the following crash on:

HEAD commit:    3c8ca708 test_kmsan.c: fix SPDX comment
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=14129497600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c07a3d4f8a59e198
dashboard link: https://syzkaller.appspot.com/bug?extid=9e3b178624a8a2f8fa28
compiler:       clang version 9.0.0 (/home/glider/llvm/clang  
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11331128e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=140b47ef600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9e3b178624a8a2f8fa28@...kaller.appspotmail.com

IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
8021q: adding VLAN 0 to HW filter on device batadv0
=====================================================
BUG: KMSAN: uninit-value in subshift lib/crypto/aes.c:149 [inline]
BUG: KMSAN: uninit-value in aes_encrypt+0x12d5/0x1bd0 lib/crypto/aes.c:282
CPU: 0 PID: 12200 Comm: syz-executor134 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x191/0x1f0 lib/dump_stack.c:113
  kmsan_report+0x14a/0x2f0 mm/kmsan/kmsan_report.c:110
  __msan_warning+0x73/0xf0 mm/kmsan/kmsan_instr.c:245
  subshift lib/crypto/aes.c:149 [inline]
  aes_encrypt+0x12d5/0x1bd0 lib/crypto/aes.c:282
  aesti_encrypt+0xe8/0x130 crypto/aes_ti.c:31
  crypto_cipher_encrypt_one include/linux/crypto.h:1763 [inline]
  crypto_cbcmac_digest_update+0x3cf/0x550 crypto/ccm.c:871
  crypto_shash_update crypto/shash.c:107 [inline]
  shash_ahash_finup+0x659/0xb20 crypto/shash.c:276
  shash_async_finup+0xbb/0x110 crypto/shash.c:291
  crypto_ahash_op+0x1cd/0x6e0 crypto/ahash.c:368
  crypto_ahash_finup+0x8c/0xb0 crypto/ahash.c:393
  crypto_ccm_auth+0x14b2/0x1570 crypto/ccm.c:230
  crypto_ccm_encrypt+0x283/0x840 crypto/ccm.c:309
  crypto_aead_encrypt+0xf2/0x180 crypto/aead.c:99
  tls_do_encryption net/tls/tls_sw.c:521 [inline]
  tls_push_record+0x341e/0x4e50 net/tls/tls_sw.c:730
  bpf_exec_tx_verdict+0x1454/0x1c80 net/tls/tls_sw.c:770
  tls_sw_sendmsg+0x158d/0x2710 net/tls/tls_sw.c:1033
  inet6_sendmsg+0x2d8/0x2e0 net/ipv6/af_inet6.c:576
  sock_sendmsg_nosec net/socket.c:637 [inline]
  sock_sendmsg net/socket.c:657 [inline]
  __sys_sendto+0x8fc/0xc70 net/socket.c:1952
  __do_sys_sendto net/socket.c:1964 [inline]
  __se_sys_sendto+0x107/0x130 net/socket.c:1960
  __x64_sys_sendto+0x6e/0x90 net/socket.c:1960
  do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291
  entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x441cf9
Code: 43 02 00 85 c0 b8 00 00 00 00 48 0f 44 c3 5b c3 90 48 89 f8 48 89 f7  
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff  
ff 0f 83 0b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00000000007eff08 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441cf9
RDX: fffffffffffffee0 RSI: 00000000200005c0 RDI: 0000000000000003
RBP: 00000000007eff30 R08: 0000000000000000 R09: 00000000000000b6
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403490
R13: 0000000000403520 R14: 0000000000000000 R15: 0000000000000000

Uninit was stored to memory at:
  kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline]
  kmsan_internal_chain_origin+0xbd/0x170 mm/kmsan/kmsan.c:319
  __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:179
  __crypto_xor+0x1e8/0x1470 crypto/algapi.c:992
  crypto_xor include/crypto/algapi.h:213 [inline]
  crypto_cbcmac_digest_update+0x2ba/0x550 crypto/ccm.c:865
  crypto_shash_update crypto/shash.c:107 [inline]
  shash_ahash_finup+0x659/0xb20 crypto/shash.c:276
  shash_async_finup+0xbb/0x110 crypto/shash.c:291
  crypto_ahash_op+0x1cd/0x6e0 crypto/ahash.c:368
  crypto_ahash_finup+0x8c/0xb0 crypto/ahash.c:393
  crypto_ccm_auth+0x14b2/0x1570 crypto/ccm.c:230
  crypto_ccm_encrypt+0x283/0x840 crypto/ccm.c:309
  crypto_aead_encrypt+0xf2/0x180 crypto/aead.c:99
  tls_do_encryption net/tls/tls_sw.c:521 [inline]
  tls_push_record+0x341e/0x4e50 net/tls/tls_sw.c:730
  bpf_exec_tx_verdict+0x1454/0x1c80 net/tls/tls_sw.c:770
  tls_sw_sendmsg+0x158d/0x2710 net/tls/tls_sw.c:1033
  inet6_sendmsg+0x2d8/0x2e0 net/ipv6/af_inet6.c:576
  sock_sendmsg_nosec net/socket.c:637 [inline]
  sock_sendmsg net/socket.c:657 [inline]
  __sys_sendto+0x8fc/0xc70 net/socket.c:1952
  __do_sys_sendto net/socket.c:1964 [inline]
  __se_sys_sendto+0x107/0x130 net/socket.c:1960
  __x64_sys_sendto+0x6e/0x90 net/socket.c:1960
  do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291
  entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was created at:
  kmsan_save_stack_with_flags+0x3f/0x90 mm/kmsan/kmsan.c:151
  kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:362 [inline]
  kmsan_alloc_page+0x153/0x370 mm/kmsan/kmsan_shadow.c:391
  __alloc_pages_nodemask+0x149d/0x60c0 mm/page_alloc.c:4794
  alloc_pages_current+0x68d/0x9a0 mm/mempolicy.c:2188
  alloc_pages include/linux/gfp.h:511 [inline]
  skb_page_frag_refill+0x2b0/0x580 net/core/sock.c:2372
  sk_page_frag_refill+0xa4/0x330 net/core/sock.c:2392
  sk_msg_alloc+0x203/0x1050 net/core/skmsg.c:37
  tls_alloc_encrypted_msg net/tls/tls_sw.c:284 [inline]
  tls_sw_sendmsg+0xb56/0x2710 net/tls/tls_sw.c:953
  inet6_sendmsg+0x2d8/0x2e0 net/ipv6/af_inet6.c:576
  sock_sendmsg_nosec net/socket.c:637 [inline]
  sock_sendmsg net/socket.c:657 [inline]
  __sys_sendto+0x8fc/0xc70 net/socket.c:1952
  __do_sys_sendto net/socket.c:1964 [inline]
  __se_sys_sendto+0x107/0x130 net/socket.c:1960
  __x64_sys_sendto+0x6e/0x90 net/socket.c:1960
  do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291
  entry_SYSCALL_64_after_hwframe+0x63/0xe7
=====================================================


---
This bug 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@...glegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches