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Date: Thu, 24 Oct 2019 10:23:53 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: Boris Pismenny <borisp@...lanox.com>,
Aviad Yehezkel <aviadye@...lanox.com>,
Dave Watson <davejwatson@...com>,
John Fastabend <john.fastabend@...il.com>,
Daniel Borkmann <daniel@...earbox.net>,
Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc: 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,
syzbot <syzbot+9e3b178624a8a2f8fa28@...kaller.appspotmail.com>
Subject: [net/tls] Re: KMSAN: uninit-value in aes_encrypt (2)
[+TLS maintainers]
This is a net/tls bug, and probably a duplicate of:
KMSAN: uninit-value in gf128mul_4k_lle (3)
https://lkml.kernel.org/linux-crypto/000000000000bf2457057b5ccda3@google.com/T/#u
KMSAN: uninit-value in aesti_encrypt
https://lkml.kernel.org/linux-crypto/000000000000a97a15058c50c52e@google.com/T/#u
See analysis from Alexander Potapenko here which shows that uninitialized memory
is being passed from TLS subsystem into crypto subsystem:
https://lkml.kernel.org/linux-crypto/CAG_fn=UGCoDk04tL2vB981JmXgo6+-RUPmrTa3dSsK5UbZaTjA@mail.gmail.com/
That was a year ago, with C reproducer, and I've sent several reminders for this
already. What's the ETA on a fix? Or is TLS subsystem de facto unmaintained?
On Thu, Oct 24, 2019 at 10:02:08AM -0700, syzbot wrote:
> 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
>
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