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Message-ID: <CAEf4BzaBxnEV0X5bOHkza1XbxtM+d06aRVoUHmOfoRFWiZHk=A@mail.gmail.com> Date: Tue, 7 May 2024 14:23:41 -0700 From: Andrii Nakryiko <andrii.nakryiko@...il.com> To: syzbot <syzbot+3ab78ff125b7979e45f9@...kaller.appspotmail.com> Cc: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com, john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org, linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, martin.lau@...ux.dev, mathieu.desnoyers@...icios.com, mhiramat@...nel.org, netdev@...r.kernel.org, rostedt@...dmis.org, sdf@...gle.com, song@...nel.org, syzkaller-bugs@...glegroups.com, yonghong.song@...ux.dev Subject: Re: [syzbot] [bpf?] [trace?] general protection fault in bpf_get_attach_cookie_tracing On Sun, May 5, 2024 at 9:13 AM syzbot <syzbot+3ab78ff125b7979e45f9@...kaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: a9e7715ce8b3 libbpf: Avoid casts from pointers to enums in.. > git tree: bpf-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=153c1dc4980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e8aa3e4736485e94 > dashboard link: https://syzkaller.appspot.com/bug?extid=3ab78ff125b7979e45f9 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17d4b588980000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16cb0470980000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/a6daa7801875/disk-a9e7715c.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/0d5b51385a69/vmlinux-a9e7715c.xz > kernel image: https://storage.googleapis.com/syzbot-assets/999297a08631/bzImage-a9e7715c.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+3ab78ff125b7979e45f9@...kaller.appspotmail.com > > general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI I suspect it's the same issue that we already fixed ([0]) in bpf/master, the fixes just haven't made it into bpf-next tree [0] 1a80dbcb2dba bpf: support deferring bpf_link dealloc to after RCU grace period > KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] > CPU: 0 PID: 5082 Comm: syz-executor316 Not tainted 6.9.0-rc5-syzkaller-01452-ga9e7715ce8b3 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 > RIP: 0010:____bpf_get_attach_cookie_tracing kernel/trace/bpf_trace.c:1179 [inline] > RIP: 0010:bpf_get_attach_cookie_tracing+0x46/0x60 kernel/trace/bpf_trace.c:1174 > Code: d3 03 00 48 81 c3 00 18 00 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 54 b9 59 00 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 3b b9 59 00 48 8b 03 5b 41 5e c3 > RSP: 0018:ffffc90002f9fba8 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888029575a00 > RDX: 0000000000000000 RSI: ffffc90000ace048 RDI: 0000000000000000 > RBP: ffffc90002f9fbc0 R08: ffffffff89938ae7 R09: 1ffffffff25e80a0 > R10: dffffc0000000000 R11: ffffffffa0000950 R12: ffffc90002f9fc80 > R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000000 > FS: 0000555578992380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000002e3e9388 CR3: 00000000791c2000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > bpf_prog_fe13437f26555f61+0x1a/0x1c > bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline] > __bpf_prog_run include/linux/filter.h:691 [inline] > bpf_prog_run include/linux/filter.h:698 [inline] > __bpf_prog_test_run_raw_tp+0x149/0x310 net/bpf/test_run.c:732 > bpf_prog_test_run_raw_tp+0x47b/0x6a0 net/bpf/test_run.c:772 > bpf_prog_test_run+0x33a/0x3b0 kernel/bpf/syscall.c:4286 > __sys_bpf+0x48d/0x810 kernel/bpf/syscall.c:5700 > __do_sys_bpf kernel/bpf/syscall.c:5789 [inline] > __se_sys_bpf kernel/bpf/syscall.c:5787 [inline] > __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5787 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f53be8a0469 > 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:00007ffdcf680a08 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 > RAX: ffffffffffffffda RBX: 00007ffdcf680bd8 RCX: 00007f53be8a0469 > RDX: 000000000000000c RSI: 0000000020000080 RDI: 000000000000000a > RBP: 00007f53be913610 R08: 0000000000000000 R09: 00007ffdcf680bd8 > R10: 00007f53be8dbae3 R11: 0000000000000246 R12: 0000000000000001 > R13: 00007ffdcf680bc8 R14: 0000000000000001 R15: 0000000000000001 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:____bpf_get_attach_cookie_tracing kernel/trace/bpf_trace.c:1179 [inline] > RIP: 0010:bpf_get_attach_cookie_tracing+0x46/0x60 kernel/trace/bpf_trace.c:1174 > Code: d3 03 00 48 81 c3 00 18 00 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 54 b9 59 00 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 3b b9 59 00 48 8b 03 5b 41 5e c3 > RSP: 0018:ffffc90002f9fba8 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888029575a00 > RDX: 0000000000000000 RSI: ffffc90000ace048 RDI: 0000000000000000 > RBP: ffffc90002f9fbc0 R08: ffffffff89938ae7 R09: 1ffffffff25e80a0 > R10: dffffc0000000000 R11: ffffffffa0000950 R12: ffffc90002f9fc80 > R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000000 > FS: 0000555578992380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000002e3e9388 CR3: 00000000791c2000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess): > 0: d3 03 roll %cl,(%rbx) > 2: 00 48 81 add %cl,-0x7f(%rax) > 5: c3 ret > 6: 00 18 add %bl,(%rax) > 8: 00 00 add %al,(%rax) > a: 48 89 d8 mov %rbx,%rax > d: 48 c1 e8 03 shr $0x3,%rax > 11: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) > 16: 74 08 je 0x20 > 18: 48 89 df mov %rbx,%rdi > 1b: e8 54 b9 59 00 call 0x59b974 > 20: 48 8b 1b mov (%rbx),%rbx > 23: 48 89 d8 mov %rbx,%rax > 26: 48 c1 e8 03 shr $0x3,%rax > * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction > 2f: 74 08 je 0x39 > 31: 48 89 df mov %rbx,%rdi > 34: e8 3b b9 59 00 call 0x59b974 > 39: 48 8b 03 mov (%rbx),%rax > 3c: 5b pop %rbx > 3d: 41 5e pop %r14 > 3f: c3 ret > > > --- > 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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