================================================================================ UBSAN: Undefined behaviour in arch/x86/kernel/uprobes.c:276:56 index 4 is out of range for type 'insn_byte_t [4]' CPU: 0 PID: 9671 Comm: syz-executor.1 Not tainted 4.19.152-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+0x22c/0x33e lib/dump_stack.c:118 ubsan_epilogue+0xe/0x3a lib/ubsan.c:161 __ubsan_handle_out_of_bounds.cold+0x63/0x6f lib/ubsan.c:383 is_prefix_bad arch/x86/kernel/uprobes.c:276 [inline] uprobe_init_insn arch/x86/kernel/uprobes.c:299 [inline] arch_uprobe_analyze_insn+0x9d8/0xaa0 arch/x86/kernel/uprobes.c:868 prepare_uprobe kernel/events/uprobes.c:611 [inline] install_breakpoint kernel/events/uprobes.c:654 [inline] uprobe_mmap+0x8c2/0xa70 kernel/events/uprobes.c:1096 mmap_region+0x552/0x1510 mm/mmap.c:1803 do_mmap+0x8e8/0x1080 mm/mmap.c:1530 do_mmap_pgoff include/linux/mm.h:2326 [inline] vm_mmap_pgoff+0x197/0x200 mm/util.c:357 ksys_mmap_pgoff+0x2d1/0x660 mm/mmap.c:1580 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45de59 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:00007fdb9d915c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000021400 RCX: 000000000045de59 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020007000 RBP: 000000000118bf78 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000412 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffca302edef R14: 00007fdb9d9169c0 R15: 000000000118bf2c ================================================================================ new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored overlayfs: upperdir is in-use as upperdir/workdir of another mount, mount with '-o index=off' to override exclusive upperdir protection. new mount options do not match the existing superblock, will be ignored EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue FAT-fs (loop2): Unrecognized mount option "euid<00000000000000000000" or missing value new mount options do not match the existing superblock, will be ignored FAT-fs (loop2): Unrecognized mount option "euid<00000000000000000000" or missing value new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored netlink: 48 bytes leftover after parsing attributes in process `syz-executor.5'. new mount options do not match the existing superblock, will be ignored netlink: 48 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 48 bytes leftover after parsing attributes in process `syz-executor.5'. new mount options do not match the existing superblock, will be ignored netlink: 48 bytes leftover after parsing attributes in process `syz-executor.5'. new mount options do not match the existing superblock, will be ignored netlink: 48 bytes leftover after parsing attributes in process `syz-executor.5'. new mount options do not match the existing superblock, will be ignored netlink: 48 bytes leftover after parsing attributes in process `syz-executor.5'. new mount options do not match the existing superblock, will be ignored netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.5'. new mount options do not match the existing superblock, will be ignored netlink: 8 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.5'. new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored nla_parse: 21 callbacks suppressed netlink: 48 bytes leftover after parsing attributes in process `syz-executor.5'.