Hello, syzbot found the following issue on: HEAD commit: ded5c1a16ec6 Merge branch 'tools-ynl-gen-code-gen-improvem.. git tree: net-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=104cdef1280000 kernel config: https://syzkaller.appspot.com/x/.config?x=526f919910d4a671 dashboard link: https://syzkaller.appspot.com/bug?extid=e79818f5c12416aba9de compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c6193b280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16c7a795280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ffd66beb6784/disk-ded5c1a1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e7336ae5a7bf/vmlinux-ded5c1a1.xz kernel image: https://storage.googleapis.com/syzbot-assets/10ded02dc7e2/bzImage-ded5c1a1.xz The issue was bisected to: commit c662b043cdca89bf0f03fc37251000ac69a3a548 Author: David Howells <dhowells@xxxxxxxxxx> Date: Tue Jun 6 13:08:56 2023 +0000 crypto: af_alg/hash: Support MSG_SPLICE_PAGES bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11cfc8d9280000 final oops: https://syzkaller.appspot.com/x/report.txt?x=13cfc8d9280000 console output: https://syzkaller.appspot.com/x/log.txt?x=15cfc8d9280000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e79818f5c12416aba9de@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: c662b043cdca ("crypto: af_alg/hash: Support MSG_SPLICE_PAGES") 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 --- This report 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
