Hello, syzbot found the following issue on: HEAD commit: 3a5879d495b2 Merge tag 'ata-6.8-rc2' of git://git.kernel.o.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1683b6bbe80000 kernel config: https://syzkaller.appspot.com/x/.config?x=bc36d99546fe9035 dashboard link: https://syzkaller.appspot.com/bug?extid=050eeedd6c285d8c42f2 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15178ea0180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=107f8eefe80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6f5df0cd5c86/disk-3a5879d4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/284ff9c3970b/vmlinux-3a5879d4.xz kernel image: https://storage.googleapis.com/syzbot-assets/b75c80c77fad/bzImage-3a5879d4.xz The issue was bisected to: commit 47309ea1359115125d9cab17a279c8df72b47235 Author: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Date: Tue Nov 28 06:52:57 2023 +0000 crypto: arc4 - Add internal state bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1325e5a0180000 final oops: https://syzkaller.appspot.com/x/report.txt?x=10a5e5a0180000 console output: https://syzkaller.appspot.com/x/log.txt?x=1725e5a0180000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+050eeedd6c285d8c42f2@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 47309ea13591 ("crypto: arc4 - Add internal state") "syz-executor299" (5065) uses obsolete ecb(arc4) skcipher BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 78051067 P4D 78051067 PUD 7e3d7067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5065 Comm: syz-executor299 Not tainted 6.8.0-rc1-syzkaller-00311-g3a5879d495b2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:memcpy_orig+0x31/0x120 arch/x86/lib/memcpy_64.S:71 Code: 48 83 fa 20 0f 82 86 00 00 00 40 38 fe 7c 35 48 83 ea 20 48 83 ea 20 4c 8b 06 4c 8b 4e 08 4c 8b 56 10 4c 8b 5e 18 48 8d 76 20 <4c> 89 07 4c 89 4f 08 4c 89 57 10 4c 89 5f 18 48 8d 7f 20 73 d4 83 RSP: 0018:ffffc90003a378c0 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff84401c81 RDX: 00000000000003c8 RSI: ffff888019ee1040 RDI: 0000000000000000 RBP: ffff888019ee1000 R08: 0000000400000003 R09: 0000002200000071 R10: 0000000800000016 R11: 0000001700000083 R12: 0000000000000000 R13: ffff88807f225da0 R14: ffff88807929e000 R15: 0000000000000001 FS: 00005555570b8380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000007c30c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> crypto_arc4_crypt+0x4b/0x70 crypto/arc4.c:33 crypto_lskcipher_crypt crypto/lskcipher.c:160 [inline] crypto_lskcipher_decrypt+0xd4/0x130 crypto/lskcipher.c:194 crypto_cbc_decrypt_segment crypto/cbc.c:80 [inline] crypto_cbc_decrypt+0x14f/0x330 crypto/cbc.c:133 crypto_lskcipher_crypt_sg+0x28c/0x460 crypto/lskcipher.c:229 crypto_skcipher_decrypt+0xda/0x160 crypto/skcipher.c:693 _skcipher_recvmsg crypto/algif_skcipher.c:199 [inline] skcipher_recvmsg+0xc2b/0x1040 crypto/algif_skcipher.c:221 sock_recvmsg_nosec net/socket.c:1046 [inline] sock_recvmsg+0xe2/0x170 net/socket.c:1068 __sys_recvfrom+0x1ab/0x2e0 net/socket.c:2242 __do_sys_recvfrom net/socket.c:2260 [inline] __se_sys_recvfrom net/socket.c:2256 [inline] __x64_sys_recvfrom+0xe0/0x1b0 net/socket.c:2256 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f23399079b9 Code: ff e8 cb 01 00 00 66 2e 0f 1f 84 00 00 00 00 00 90 80 3d f1 56 07 00 00 41 89 ca 74 1c 45 31 c9 45 31 c0 b8 2d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 67 c3 66 0f 1f 44 00 00 55 48 83 ec 20 48 89 RSP: 002b:00007ffe68b37d28 EFLAGS: 00000246 ORIG_RAX: 000000000000002d RAX: ffffffffffffffda RBX: 00007ffe68b37db4 RCX: 00007f23399079b9 RDX: 0000000000001000 RSI: 00007ffe68b37da0 RDI: 0000000000000004 RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe68b37da0 R13: 00007ffe68b38f88 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: CR2: 0000000000000000 ---[ end trace 0000000000000000 ]--- RIP: 0010:memcpy_orig+0x31/0x120 arch/x86/lib/memcpy_64.S:71 Code: 48 83 fa 20 0f 82 86 00 00 00 40 38 fe 7c 35 48 83 ea 20 48 83 ea 20 4c 8b 06 4c 8b 4e 08 4c 8b 56 10 4c 8b 5e 18 48 8d 76 20 <4c> 89 07 4c 89 4f 08 4c 89 57 10 4c 89 5f 18 48 8d 7f 20 73 d4 83 RSP: 0018:ffffc90003a378c0 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff84401c81 RDX: 00000000000003c8 RSI: ffff888019ee1040 RDI: 0000000000000000 RBP: ffff888019ee1000 R08: 0000000400000003 R09: 0000002200000071 R10: 0000000800000016 R11: 0000001700000083 R12: 0000000000000000 R13: ffff88807f225da0 R14: ffff88807929e000 R15: 0000000000000001 FS: 00005555570b8380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000007c30c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 83 fa 20 cmp $0x20,%rdx 4: 0f 82 86 00 00 00 jb 0x90 a: 40 38 fe cmp %dil,%sil d: 7c 35 jl 0x44 f: 48 83 ea 20 sub $0x20,%rdx 13: 48 83 ea 20 sub $0x20,%rdx 17: 4c 8b 06 mov (%rsi),%r8 1a: 4c 8b 4e 08 mov 0x8(%rsi),%r9 1e: 4c 8b 56 10 mov 0x10(%rsi),%r10 22: 4c 8b 5e 18 mov 0x18(%rsi),%r11 26: 48 8d 76 20 lea 0x20(%rsi),%rsi * 2a: 4c 89 07 mov %r8,(%rdi) <-- trapping instruction 2d: 4c 89 4f 08 mov %r9,0x8(%rdi) 31: 4c 89 57 10 mov %r10,0x10(%rdi) 35: 4c 89 5f 18 mov %r11,0x18(%rdi) 39: 48 8d 7f 20 lea 0x20(%rdi),%rdi 3d: 73 d4 jae 0x13 3f: 83 .byte 0x83 --- 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 report is already addressed, 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 overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
