UBSAN: array-index-out-of-bounds in arch/x86/kernel/uprobes.c:263:56 index 4 is out of range for type 'insn_byte_t [4]' CPU: 0 PID: 18678 Comm: syz-executor.5 Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:356 is_prefix_bad arch/x86/kernel/uprobes.c:263 [inline] uprobe_init_insn arch/x86/kernel/uprobes.c:286 [inline] arch_uprobe_analyze_insn+0x8f3/0xa40 arch/x86/kernel/uprobes.c:856 prepare_uprobe kernel/events/uprobes.c:860 [inline] install_breakpoint.isra.0+0x6c4/0x7c0 kernel/events/uprobes.c:903 register_for_each_vma+0x896/0xc10 kernel/events/uprobes.c:1071 uprobe_apply+0xfc/0x150 kernel/events/uprobes.c:1231 uprobe_perf_open kernel/trace/trace_uprobe.c:1311 [inline] trace_uprobe_register+0x5c9/0x880 kernel/trace/trace_uprobe.c:1463 perf_trace_event_open kernel/trace/trace_event_perf.c:186 [inline] perf_trace_event_init kernel/trace/trace_event_perf.c:208 [inline] perf_trace_event_init+0x17a/0xa20 kernel/trace/trace_event_perf.c:195 perf_uprobe_init+0x16f/0x210 kernel/trace/trace_event_perf.c:336 perf_uprobe_event_init+0xff/0x1c0 kernel/events/core.c:9741 perf_try_init_event+0x12a/0x560 kernel/events/core.c:11058 perf_init_event kernel/events/core.c:11110 [inline] perf_event_alloc.part.0+0xe3b/0x38e0 kernel/events/core.c:11388 perf_event_alloc kernel/events/core.c:11767 [inline] __do_sys_perf_event_open+0x72c/0x2cb0 kernel/events/core.c:11883 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45deb9 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fafe2945c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000024e40 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 000000000119c0c0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119c07c R13: 00007ffe4966d9ef R14: 00007fafe29469c0 R15: 000000000119c07c ================================================================================