================================================================================ 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: 2 PID: 13008 Comm: syz-executor.3 Not tainted 5.10.0-rc6-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 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+0x8f4/0xa40 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 uprobe_mmap+0x5ec/0x1080 kernel/events/uprobes.c:1394 mmap_region+0x56c/0x1760 mm/mmap.c:1886 do_mmap+0xcf9/0x11d0 mm/mmap.c:1583 vm_mmap_pgoff+0x195/0x200 mm/util.c:507 ksys_mmap_pgoff+0x444/0x580 mm/mmap.c:1634 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45da59 Code: bd b1 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 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f51b191ac88 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000713600 RCX: 000000000045da59 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020007000 RBP: 00000000004aab86 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000412 R11: 0000000000000246 R12: 000000000075bf00 R13: 00007ffd87feecef R14: 00007f51b18fb000 R15: 0000000000000003 ================================================================================