syzbot

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UBSAN: array-index-out-of-bounds in arch/x86/kernel/uprobes.c:263:36
index 4 is out of range for type 'insn_byte_t [4]'
CPU: 1 PID: 8455 Comm: syz-executor886 Not tainted 5.10.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x137/0x1be lib/dump_stack.c:118
 ubsan_epilogue lib/ubsan.c:148 [inline]
 __ubsan_handle_out_of_bounds+0xdb/0x130 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+0x1e7/0x12c0 arch/x86/kernel/uprobes.c:856
 prepare_uprobe kernel/events/uprobes.c:860 [inline]
 install_breakpoint+0x3f1/0x450 kernel/events/uprobes.c:903
 uprobe_mmap+0xd6f/0x1270 kernel/events/uprobes.c:1394
 mmap_region+0xa44/0x1bc0 mm/mmap.c:1886
 do_mmap+0x964/0x11e0 mm/mmap.c:1583
 vm_mmap_pgoff+0x12c/0x1c0 mm/util.c:507
 ksys_mmap_pgoff+0x358/0x4f0 mm/mmap.c:1634
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440379
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffeb3813ae8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440379
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020007000
RBP: 00000000006ca018 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000412 R11: 0000000000000246 R12: 0000000000401b80
R13: 0000000000401c10 R14: 0000000000000000 R15: 0000000000000000
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