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Message-ID: <00000000000026353b060fc21c07@google.com> Date: Thu, 25 Jan 2024 01:50:30 -0800 From: syzbot <syzbot+1336f3d4b10bcda75b89@...kaller.appspotmail.com> To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net, haoluo@...gle.com, john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org, linux-kernel@...r.kernel.org, martin.lau@...ux.dev, netdev@...r.kernel.org, sdf@...gle.com, song@...nel.org, syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev Subject: [syzbot] [bpf?] general protection fault in btf_is_module Hello, syzbot found the following issue on: HEAD commit: d47b9f68d289 libbpf: Correct bpf_core_read.h comment wrt b.. git tree: bpf-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=104b1ef7e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=719e6acaf392d56b dashboard link: https://syzkaller.appspot.com/bug?extid=1336f3d4b10bcda75b89 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=10c1a53be80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1052cec3e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1a9b4a5622fb/disk-d47b9f68.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/dd68baeac4fd/vmlinux-d47b9f68.xz kernel image: https://storage.googleapis.com/syzbot-assets/811ba9dc9ddf/bzImage-d47b9f68.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1336f3d4b10bcda75b89@...kaller.appspotmail.com general protection fault, probably for non-canonical address 0xdffffc000000001b: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000d8-0x00000000000000df] CPU: 0 PID: 5064 Comm: syz-executor334 Not tainted 6.7.0-syzkaller-12348-gd47b9f68d289 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:btf_is_module+0x26/0x80 kernel/bpf/btf.c:7441 Code: 00 eb f0 90 66 0f 1f 00 55 53 48 89 fb e8 92 24 de ff 48 8d bb d8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 02 7e 48 0f b6 ab d8 00 00 00 31 ff 89 ee e8 RSP: 0018:ffffc900039ff828 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81a07f47 RDX: 000000000000001b RSI: ffffffff81a9fcfe RDI: 00000000000000d8 RBP: ffffc900039ffaf0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000004 R11: ffffffff8aa0008b R12: ffffc90000ae6038 R13: ffffc90000ae6000 R14: 0000000000000000 R15: 0000000000000000 FS: 000055555660b380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001b6b398 CR3: 000000001aaae000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> check_struct_ops_btf_id kernel/bpf/verifier.c:20302 [inline] check_attach_btf_id kernel/bpf/verifier.c:20730 [inline] bpf_check+0x6cfe/0x9df0 kernel/bpf/verifier.c:20898 bpf_prog_load+0x14dc/0x2310 kernel/bpf/syscall.c:2769 __sys_bpf+0xbf7/0x4a00 kernel/bpf/syscall.c:5463 __do_sys_bpf kernel/bpf/syscall.c:5567 [inline] __se_sys_bpf kernel/bpf/syscall.c:5565 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5565 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: 0033:0x7f4dbbe514a9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe76acbe18 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ffe76acbff8 RCX: 00007f4dbbe514a9 RDX: 00000000000000a0 RSI: 00000000200009c0 RDI: 0000000000000005 RBP: 00007f4dbbec4610 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe76acbfe8 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:btf_is_module+0x26/0x80 kernel/bpf/btf.c:7441 Code: 00 eb f0 90 66 0f 1f 00 55 53 48 89 fb e8 92 24 de ff 48 8d bb d8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 02 7e 48 0f b6 ab d8 00 00 00 31 ff 89 ee e8 RSP: 0018:ffffc900039ff828 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81a07f47 RDX: 000000000000001b RSI: ffffffff81a9fcfe RDI: 00000000000000d8 RBP: ffffc900039ffaf0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000004 R11: ffffffff8aa0008b R12: ffffc90000ae6038 R13: ffffc90000ae6000 R14: 0000000000000000 R15: 0000000000000000 FS: 000055555660b380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001b6b398 CR3: 000000001aaae000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 eb add %ch,%bl 2: f0 90 lock nop 4: 66 0f 1f 00 nopw (%rax) 8: 55 push %rbp 9: 53 push %rbx a: 48 89 fb mov %rdi,%rbx d: e8 92 24 de ff call 0xffde24a4 12: 48 8d bb d8 00 00 00 lea 0xd8(%rbx),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 74 02 je 0x34 32: 7e 48 jle 0x7c 34: 0f b6 ab d8 00 00 00 movzbl 0xd8(%rbx),%ebp 3b: 31 ff xor %edi,%edi 3d: 89 ee mov %ebp,%esi 3f: e8 .byte 0xe8 --- 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@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. 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
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