On 7/3/22 9:23 AM, syzbot wrote:
Hello, syzbot found the following issue on: HEAD commit: 179a93f74b29 fprobe, samples: Add module parameter descrip.. git tree: bpf console output: https://syzkaller.appspot.com/x/log.txt?x=17bc8604080000 kernel config: https://syzkaller.appspot.com/x/.config?x=70e1a4d352a3c6ae dashboard link: https://syzkaller.appspot.com/bug?extid=66d306fee539916084c2 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet.
Cc'ing Song, looks like UAF? Could potentially be related to the other triggered warnings around the JIT from syzkaller recently.
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+66d306fee539916084c2@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: unable to handle page fault for address: ffffffffa0000a18 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD ba8f067 P4D ba8f067 PUD ba90063 PMD 1451e6067 PTE 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 10814 Comm: syz-executor.2 Not tainted 5.19.0-rc2-syzkaller-00122-g179a93f74b29 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:bpf_prog_9d4bccaf8ccaf0dc_F+0x0/0xd Code: Unable to access opcode bytes at RIP 0xffffffffa00009ee. RSP: 0018:ffffc90003517250 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: ffffc90003563000 RCX: 0000000000000000 RDX: 1ffff920006ac606 RSI: ffffc90003563048 RDI: 00000000ffff8880 RBP: ffffc90003517258 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001 R13: ffff88802403bb00 R14: ffff88802fa60000 R15: 0000000000000001 FS: 00007f63ca616700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffa00009ee CR3: 000000002f068000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bpf_dispatcher_nop_func include/linux/bpf.h:869 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2046 [inline] bpf_trace_run4+0x124/0x360 kernel/trace/bpf_trace.c:2085 __bpf_trace_sched_switch+0x115/0x160 include/trace/events/sched.h:222 __traceiter_sched_switch+0x68/0xb0 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x145b/0x4b30 kernel/sched/core.c:6425 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6593 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:389 [inline] __cond_resched_lock+0x93/0xe0 kernel/sched/core.c:8270 __purge_vmap_area_lazy+0x976/0x1c50 mm/vmalloc.c:1728 _vm_unmap_aliases.part.0+0x3f0/0x500 mm/vmalloc.c:2125 _vm_unmap_aliases mm/vmalloc.c:2099 [inline] vm_remove_mappings mm/vmalloc.c:2624 [inline] __vunmap+0x6d5/0xd30 mm/vmalloc.c:2651 __vfree+0x3c/0xd0 mm/vmalloc.c:2713 vfree+0x5a/0x90 mm/vmalloc.c:2744 bpf_jit_binary_free kernel/bpf/core.c:1080 [inline] bpf_jit_free+0x21a/0x2b0 kernel/bpf/core.c:1203 jit_subprogs kernel/bpf/verifier.c:13683 [inline] fixup_call_args kernel/bpf/verifier.c:13712 [inline] bpf_check+0x71ab/0xbbc0 kernel/bpf/verifier.c:15063 bpf_prog_load+0xfb2/0x2250 kernel/bpf/syscall.c:2575 __sys_bpf+0x11a1/0x5700 kernel/bpf/syscall.c:4917 __do_sys_bpf kernel/bpf/syscall.c:5021 [inline] __se_sys_bpf kernel/bpf/syscall.c:5019 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:5019 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f63c9489109 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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:00007f63ca616168 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f63c959c030 RCX: 00007f63c9489109 RDX: 0000000000000070 RSI: 0000000020000440 RDI: 0000000000000005 RBP: 00007f63c94e305d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffde158863f R14: 00007f63ca616300 R15: 0000000000022000 </TASK> Modules linked in: CR2: ffffffffa0000a18 ---[ end trace 0000000000000000 ]--- RIP: 0010:bpf_prog_9d4bccaf8ccaf0dc_F+0x0/0xd Code: Unable to access opcode bytes at RIP 0xffffffffa00009ee. RSP: 0018:ffffc90003517250 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: ffffc90003563000 RCX: 0000000000000000 RDX: 1ffff920006ac606 RSI: ffffc90003563048 RDI: 00000000ffff8880 RBP: ffffc90003517258 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001 R13: ffff88802403bb00 R14: ffff88802fa60000 R15: 0000000000000001 FS: 00007f63ca616700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffa00009ee CR3: 000000002f068000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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.
