syzbot


general protection fault in shash_async_update

Status: fixed on 2023/09/28 17:51
Subsystems: crypto
[Documentation on labels]
Reported-by: syzbot+0bc501b7bf9e1bc09958@syzkaller.appspotmail.com
Fix commit: b6d972f68983 crypto: af_alg/hash: Fix recvmsg() after sendmsg(MSG_MORE)
First crash: 341d, last: 332d
Cause bisection: introduced by (bisect log) :
commit c662b043cdca89bf0f03fc37251000ac69a3a548
Author: David Howells <dhowells@redhat.com>
Date: Tue Jun 6 13:08:56 2023 +0000

  crypto: af_alg/hash: Support MSG_SPLICE_PAGES

Crash: general protection fault in shash_async_update (log)
Repro: C syz .config
  
Fix bisection: fixed by (bisect log) :
commit 30c3d3b70aba2464ee8c91025e91428f92464077
Author: Mario Limonciello <mario.limonciello@amd.com>
Date: Tue May 30 16:57:59 2023 +0000

  drm/amd: Disallow s0ix without BIOS support again

  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [crypto?] general protection fault in shash_async_update 3 (6) 2023/07/26 10:46
Last patch testing requests (1)
Created Duration User Patch Repo Result
2023/06/23 14:56 28m dhowells@redhat.com git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main OK log
Cause bisection attempts (2)
Created Duration User Patch Repo Result
2023/06/21 16:39 6h06m bisect net-next job log (1) log
2023/06/12 22:29 1h45m bisect net-next error job log (0)

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 0 PID: 5005 Comm: syz-executor418 Not tainted 6.4.0-rc5-syzkaller-01111-g26a4dd839eeb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
RIP: 0010:crypto_shash_alg include/crypto/hash.h:827 [inline]
RIP: 0010:crypto_shash_update crypto/shash.c:124 [inline]
RIP: 0010:shash_ahash_update crypto/shash.c:306 [inline]
RIP: 0010:shash_async_update+0x130/0x210 crypto/shash.c:314
Code: 36 0c a5 fd 48 8b 44 24 08 48 8b 6c 24 48 80 38 00 0f 85 c3 00 00 00 48 8b 04 24 4c 8b 68 50 49 8d 7d 20 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 bd 00 00 00 4d 8b 75 20 49 8d 7e 2c 48 89 fa 48
RSP: 0018:ffffc90003a1f968 EFLAGS: 00010202
RAX: ffff8880206b02a8 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff83df3a1a RDI: 0000000000000020
RBP: ffff888072b43240 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000dc0 R11: 0000000000000009 R12: 0000000000000dc0
R13: 0000000000000000 R14: 1ffff110040d605f R15: ffff8880206b02f8
FS:  0000555557028300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4ef51f2304 CR3: 000000001328b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 crypto_ahash_update include/crypto/hash.h:608 [inline]
 hash_sendmsg+0x434/0xde0 crypto/algif_hash.c:139
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg+0xde/0x190 net/socket.c:747
 ____sys_sendmsg+0x733/0x920 net/socket.c:2493
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2547
 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2576
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f71e8ca1c89
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffebca0c5d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f71e8ca1c89
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000004
RBP: 00007f71e8c65e30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f71e8c65ec0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:crypto_shash_alg include/crypto/hash.h:827 [inline]
RIP: 0010:crypto_shash_update crypto/shash.c:124 [inline]
RIP: 0010:shash_ahash_update crypto/shash.c:306 [inline]
RIP: 0010:shash_async_update+0x130/0x210 crypto/shash.c:314
Code: 36 0c a5 fd 48 8b 44 24 08 48 8b 6c 24 48 80 38 00 0f 85 c3 00 00 00 48 8b 04 24 4c 8b 68 50 49 8d 7d 20 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 bd 00 00 00 4d 8b 75 20 49 8d 7e 2c 48 89 fa 48
RSP: 0018:ffffc90003a1f968 EFLAGS: 00010202
RAX: ffff8880206b02a8 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff83df3a1a RDI: 0000000000000020
RBP: ffff888072b43240 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000dc0 R11: 0000000000000009 R12: 0000000000000dc0
R13: 0000000000000000 R14: 1ffff110040d605f R15: ffff8880206b02f8
FS:  0000555557028300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffebcaca020 CR3: 000000001328b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	36 0c a5             	ss or  $0xa5,%al
   3:	fd                   	std
   4:	48 8b 44 24 08       	mov    0x8(%rsp),%rax
   9:	48 8b 6c 24 48       	mov    0x48(%rsp),%rbp
   e:	80 38 00             	cmpb   $0x0,(%rax)
  11:	0f 85 c3 00 00 00    	jne    0xda
  17:	48 8b 04 24          	mov    (%rsp),%rax
  1b:	4c 8b 68 50          	mov    0x50(%rax),%r13
  1f:	49 8d 7d 20          	lea    0x20(%r13),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 1a 00          	cmpb   $0x0,(%rdx,%rbx,1) <-- trapping instruction
  2e:	0f 85 bd 00 00 00    	jne    0xf1
  34:	4d 8b 75 20          	mov    0x20(%r13),%r14
  38:	49 8d 7e 2c          	lea    0x2c(%r14),%rdi
  3c:	48 89 fa             	mov    %rdi,%rdx
  3f:	48                   	rex.W

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/12 03:55 net-next 26a4dd839eeb 7086cdb9 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in shash_async_update
2023/06/20 21:54 net-next 712557f21072 09ffe269 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in shash_async_update
2023/06/19 07:58 net-next 9a94d764e9bc f3921d4d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in shash_async_update
2023/06/18 12:13 net-next b650d953cd39 f3921d4d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in shash_async_update
2023/06/16 23:23 net-next c08afcdcf952 f3921d4d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in shash_async_update
2023/06/16 22:58 net-next c08afcdcf952 f3921d4d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in shash_async_update
2023/06/16 18:00 net-next 97c5209b3d37 f3921d4d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in shash_async_update
2023/06/16 12:04 net-next 97c5209b3d37 f3921d4d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in shash_async_update
2023/06/14 06:49 net-next 6b5f9a87e12d d2ee9228 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in shash_async_update
2023/06/13 04:36 net-next 3a2cb45ca0cc 749afb64 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in shash_async_update
2023/06/13 03:22 net-next 3a2cb45ca0cc 749afb64 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in shash_async_update
2023/06/12 03:09 net-next 26a4dd839eeb 7086cdb9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in shash_async_update
* Struck through repros no longer work on HEAD.