syzbot


general protection fault in cryptd_hash_export

Status: fixed on 2023/09/28 17:51
Subsystems: crypto
[Documentation on labels]
Reported-by: syzbot+e79818f5c12416aba9de@syzkaller.appspotmail.com
Fix commit: b6d972f68983 crypto: af_alg/hash: Fix recvmsg() after sendmsg(MSG_MORE)
First crash: 316d, last: 306d
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 cryptd_hash_export (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 cryptd_hash_export 6 (10) 2023/07/26 13:01
Last patch testing requests (2)
Created Duration User Patch Repo Result
2023/07/25 15:29 21m dhowells@redhat.com git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git b6d972f6898308fbe7e693bf8d44ebfdb1cd2dc4 OK log
2023/06/14 14:54 19m dhowells@redhat.com patch git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main OK log

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: 1 PID: 5003 Comm: syz-executor195 Not tainted 6.4.0-rc5-syzkaller-00929-gded5c1a16ec6 #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_export include/crypto/hash.h:956 [inline]
RIP: 0010:cryptd_hash_export+0x47/0xa0 crypto/cryptd.c:636
Code: 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 75 4e 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 60 48 8d 7b 20 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 40 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 20 48 8d
RSP: 0018:ffffc90003acfd48 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff83e46723 RDI: 0000000000000020
RBP: ffff888015a96528 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff81d71db5 R12: ffff88802945bb08
R13: 0000000000000001 R14: ffff88801aba6000 R15: ffff8880220c1648
FS:  0000555556eb3300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020004e80 CR3: 0000000076861000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 crypto_ahash_export include/crypto/hash.h:523 [inline]
 hash_accept+0x229/0x670 crypto/algif_hash.c:286
 do_accept+0x380/0x510 net/socket.c:1871
 __sys_accept4_file net/socket.c:1912 [inline]
 __sys_accept4+0x9a/0x120 net/socket.c:1942
 __do_sys_accept4 net/socket.c:1953 [inline]
 __se_sys_accept4 net/socket.c:1950 [inline]
 __x64_sys_accept4+0x97/0x100 net/socket.c:1950
 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: 0033:0x7f6a9d4eac09
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:00007fff241f3198 EFLAGS: 00000246 ORIG_RAX: 0000000000000120
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6a9d4eac09
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f6a9d4aedb0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6a9d4aee40
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_export include/crypto/hash.h:956 [inline]
RIP: 0010:cryptd_hash_export+0x47/0xa0 crypto/cryptd.c:636
Code: 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 75 4e 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 60 48 8d 7b 20 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 40 48 b8 00 00 00 00 00 fc ff df 48 8b 5b 20 48 8d
RSP: 0018:ffffc90003acfd48 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff83e46723 RDI: 0000000000000020
RBP: ffff888015a96528 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff81d71db5 R12: ffff88802945bb08
R13: 0000000000000001 R14: ffff88801aba6000 R15: ffff8880220c1648
FS:  0000555556eb3300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555a4edc6008 CR3: 0000000076861000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	df 4c 89 e2          	fisttps -0x1e(%rcx,%rcx,4)
   4:	48 c1 ea 03          	shr    $0x3,%rdx
   8:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   c:	75 4e                	jne    0x5c
   e:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  15:	fc ff df
  18:	48 8b 5b 60          	mov    0x60(%rbx),%rbx
  1c:	48 8d 7b 20          	lea    0x20(%rbx),%rdi
  20:	48 89 fa             	mov    %rdi,%rdx
  23:	48 c1 ea 03          	shr    $0x3,%rdx
* 27:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2b:	75 40                	jne    0x6d
  2d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  34:	fc ff df
  37:	48 8b 5b 20          	mov    0x20(%rbx),%rbx
  3b:	48                   	rex.W
  3c:	8d                   	.byte 0x8d

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/10 15:37 net-next ded5c1a16ec6 7086cdb9 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in cryptd_hash_export
2023/06/20 12:24 net-next 712557f21072 09ffe269 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in cryptd_hash_export
2023/06/18 16:40 net-next b650d953cd39 f3921d4d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in cryptd_hash_export
2023/06/18 00:25 net-next a52305a81d6b f3921d4d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in cryptd_hash_export
2023/06/18 00:24 net-next a52305a81d6b f3921d4d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in cryptd_hash_export
2023/06/17 00:03 net-next c08afcdcf952 f3921d4d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in cryptd_hash_export
2023/06/15 22:55 net-next 97c5209b3d37 757d26ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in cryptd_hash_export
2023/06/14 19:10 net-next 2bddad9ec65a d2ee9228 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in cryptd_hash_export
2023/06/14 15:36 net-next 2bddad9ec65a d2ee9228 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in cryptd_hash_export
2023/06/10 15:18 net-next ded5c1a16ec6 7086cdb9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in cryptd_hash_export
2023/06/15 22:55 linux-next 925294c9aa18 757d26ed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in cryptd_hash_export
2023/06/14 15:35 linux-next b16049b21162 d2ee9228 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in cryptd_hash_export
* Struck through repros no longer work on HEAD.