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=11479fe7e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=719e6acaf392d56b dashboard link: https://syzkaller.appspot.com/bug?extid=88f0aafe5f950d7489d7 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=14ea6be3e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15bc199be80000 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 The issue was bisected to: commit fcc2c1fb0651477c8ed78a3a293c175ccd70697a Author: Kui-Feng Lee <thinker.li@xxxxxxxxx> Date: Fri Jan 19 22:49:59 2024 +0000 bpf: pass attached BTF to the bpf_struct_ops subsystem bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=106a04c3e80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=126a04c3e80000 console output: https://syzkaller.appspot.com/x/log.txt?x=146a04c3e80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+88f0aafe5f950d7489d7@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: fcc2c1fb0651 ("bpf: pass attached BTF to the bpf_struct_ops subsystem") general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f] CPU: 0 PID: 5058 Comm: syz-executor257 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:bpf_struct_ops_find_value+0x49/0x140 kernel/bpf/btf.c:8763 Code: 7d ea dd ff 45 85 e4 0f 84 d7 00 00 00 e8 ff ee dd ff 48 8d bb 88 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 dc 00 00 00 48 8b 9b 88 00 00 00 48 85 db 0f 84 RSP: 0018:ffffc90003bb7b20 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81aa3283 RDX: 0000000000000011 RSI: ffffffff81aa3291 RDI: 0000000000000088 RBP: ffffc90003bb7dd0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000002 R13: 000000000000001a R14: ffffffff8ad6bca0 R15: ffffc90003bb7e04 FS: 0000555556ed2380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000160d398 CR3: 000000007809c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bpf_struct_ops_map_alloc+0x12f/0x5d0 kernel/bpf/bpf_struct_ops.c:674 map_create+0x548/0x1b90 kernel/bpf/syscall.c:1237 __sys_bpf+0xa32/0x4a00 kernel/bpf/syscall.c:5445 __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: 0033:0x7f9f205ef2e9 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:00007fffa4ce4088 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fffa4ce4268 RCX: 00007f9f205ef2e9 RDX: 0000000000000048 RSI: 00000000200004c0 RDI: 0000000000000000 RBP: 00007f9f20662610 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 R13: 00007fffa4ce4258 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bpf_struct_ops_find_value+0x49/0x140 kernel/bpf/btf.c:8763 Code: 7d ea dd ff 45 85 e4 0f 84 d7 00 00 00 e8 ff ee dd ff 48 8d bb 88 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 dc 00 00 00 48 8b 9b 88 00 00 00 48 85 db 0f 84 RSP: 0018:ffffc90003bb7b20 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81aa3283 RDX: 0000000000000011 RSI: ffffffff81aa3291 RDI: 0000000000000088 RBP: ffffc90003bb7dd0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000002 R13: 000000000000001a R14: ffffffff8ad6bca0 R15: ffffc90003bb7e04 FS: 0000555556ed2380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000160d398 CR3: 000000007809c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 4 bytes skipped: 0: 45 85 e4 test %r12d,%r12d 3: 0f 84 d7 00 00 00 je 0xe0 9: e8 ff ee dd ff call 0xffddef0d e: 48 8d bb 88 00 00 00 lea 0x88(%rbx),%rdi 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 89 fa mov %rdi,%rdx 22: 48 c1 ea 03 shr $0x3,%rdx * 26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2a: 0f 85 dc 00 00 00 jne 0x10c 30: 48 8b 9b 88 00 00 00 mov 0x88(%rbx),%rbx 37: 48 85 db test %rbx,%rbx 3a: 0f .byte 0xf 3b: 84 .byte 0x84 --- 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
