netlink: 160 bytes leftover after parsing attributes in process `syz.2.3960'.
==================================================================
BUG: KASAN: use-after-free in bq_enqueue kernel/bpf/cpumap.c:749 [inline]
BUG: KASAN: use-after-free in cpu_map_enqueue+0xb4/0x370 kernel/bpf/cpumap.c:775
Read of size 8 at addr ffff8881298a6508 by task syz.2.3960/16973
CPU: 0 PID: 16973 Comm: syz.2.3960 Not tainted 6.1.99-syzkaller-00108-gd4dab27b9d1c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0x158/0x4e0 mm/kasan/report.c:427
kasan_report+0x13c/0x170 mm/kasan/report.c:531
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351
bq_enqueue kernel/bpf/cpumap.c:749 [inline]
cpu_map_enqueue+0xb4/0x370 kernel/bpf/cpumap.c:775
__xdp_do_redirect_frame net/core/filter.c:4291 [inline]
xdp_do_redirect+0x5b0/0xc60 net/core/filter.c:4335
tun_xdp_act+0xdb/0xc00 drivers/net/tun.c:1625
tun_build_skb drivers/net/tun.c:1715 [inline]
tun_get_user+0xb35/0x3a90 drivers/net/tun.c:1818
tun_chr_write_iter+0x129/0x210 drivers/net/tun.c:2044
call_write_iter include/linux/fs.h:2274 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0xaf6/0xed0 fs/read_write.c:584
ksys_write+0x199/0x2c0 fs/read_write.c:637
__do_sys_write fs/read_write.c:649 [inline]
__se_sys_write fs/read_write.c:646 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:646
x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f12a2b7cadf
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48
RSP: 002b:00007f12a3a37000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f12a2d36058 RCX: 00007f12a2b7cadf
RDX: 000000000000003e RSI: 0000000020002340 RDI: 00000000000000c8
RBP: 00007f12a2bf0296 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000003e R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f12a2d36058 R15: 00007ffd4a2f5058
Allocated by task 16623:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
____kasan_kmalloc mm/kasan/common.c:379 [inline]
__kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:388
kasan_kmalloc include/linux/kasan.h:212 [inline]
kmalloc_trace+0x44/0xa0 mm/slab_common.c:1052
kmalloc include/linux/slab.h:556 [inline]
kzalloc include/linux/slab.h:692 [inline]
kset_create lib/kobject.c:950 [inline]
kset_create_and_add+0x5c/0x2b0 lib/kobject.c:993
register_queue_kobjects net/core/net-sysfs.c:1760 [inline]
netdev_register_kobject+0x1a6/0x320 net/core/net-sysfs.c:2013
register_netdevice+0xe43/0x1490 net/core/dev.c:10107
veth_newlink+0x7fc/0xc70 drivers/net/veth.c:1775
rtnl_newlink_create net/core/rtnetlink.c:3390 [inline]
__rtnl_newlink net/core/rtnetlink.c:3610 [inline]
rtnl_newlink+0x14c6/0x2030 net/core/rtnetlink.c:3623
rtnetlink_rcv_msg+0x9a5/0xca0 net/core/rtnetlink.c:6121
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2518
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6139
netlink_unicast_kernel net/netlink/af_netlink.c:1327 [inline]
netlink_unicast+0x906/0xab0 net/netlink/af_netlink.c:1353
netlink_sendmsg+0xa15/0xd30 net/netlink/af_netlink.c:1875
sock_sendmsg_nosec net/socket.c:716 [inline]
__sock_sendmsg net/socket.c:728 [inline]
__sys_sendto+0x480/0x600 net/socket.c:2138
__do_sys_sendto net/socket.c:2150 [inline]
__se_sys_sendto net/socket.c:2146 [inline]
__x64_sys_sendto+0xe5/0x100 net/socket.c:2146
x64_sys_call+0x15c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Freed by task 2645:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:249
kasan_slab_free include/linux/kasan.h:178 [inline]
slab_free_hook mm/slub.c:1745 [inline]
slab_free_freelist_hook mm/slub.c:1771 [inline]
slab_free mm/slub.c:3684 [inline]
__kmem_cache_free+0x218/0x3b0 mm/slub.c:3697
kfree+0x7a/0xf0 mm/slab_common.c:1009
kset_release+0x19/0x20 lib/kobject.c:913
kobject_cleanup lib/kobject.c:681 [inline]
kobject_release lib/kobject.c:712 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x178/0x260 lib/kobject.c:729
kset_unregister+0x6e/0x80 lib/kobject.c:876
remove_queue_kobjects net/core/net-sysfs.c:1829 [inline]
netdev_unregister_kobject+0x175/0x260 net/core/net-sysfs.c:1977
unregister_netdevice_many+0x122c/0x1740 net/core/dev.c:10917
default_device_exit_batch+0x975/0xa00 net/core/dev.c:11403
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x6c9/0xbf0 net/core/net_namespace.c:604
process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299
worker_thread+0xa60/0x1260 kernel/workqueue.c:2446
kthread+0x26d/0x300 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
Last potentially related work creation:
kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:486
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
__call_rcu_common kernel/rcu/tree.c:2806 [inline]
call_rcu+0xee/0x1340 kernel/rcu/tree.c:2925
tnode_free net/ipv4/fib_trie.c:496 [inline]
replace+0x19b/0x4b0 net/ipv4/fib_trie.c:522
inflate net/ipv4/fib_trie.c:624 [inline]
resize+0xbaf/0x1d60 net/ipv4/fib_trie.c:869
trie_rebalance net/ipv4/fib_trie.c:1106 [inline]
fib_insert_node net/ipv4/fib_trie.c:1150 [inline]
fib_insert_alias+0xb20/0x1060 net/ipv4/fib_trie.c:1164
fib_table_insert+0xa01/0x20a0 net/ipv4/fib_trie.c:1378
fib_magic net/ipv4/fib_frontend.c:1104 [inline]
fib_add_ifaddr+0x43f/0x15e0 net/ipv4/fib_frontend.c:1126
fib_inetaddr_event+0x159/0x310 net/ipv4/fib_frontend.c:1440
notifier_call_chain kernel/notifier.c:87 [inline]
blocking_notifier_call_chain+0xbb/0x140 kernel/notifier.c:382
__inet_insert_ifa+0x8fb/0xb10 net/ipv4/devinet.c:554
inet_rtm_newaddr+0x8f7/0x1780 net/ipv4/devinet.c:960
rtnetlink_rcv_msg+0x9a5/0xca0 net/core/rtnetlink.c:6121
netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2518
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6139
netlink_unicast_kernel net/netlink/af_netlink.c:1327 [inline]
netlink_unicast+0x906/0xab0 net/netlink/af_netlink.c:1353
netlink_sendmsg+0xa15/0xd30 net/netlink/af_netlink.c:1875
sock_sendmsg_nosec net/socket.c:716 [inline]
__sock_sendmsg net/socket.c:728 [inline]
__sys_sendto+0x480/0x600 net/socket.c:2138
__do_sys_sendto net/socket.c:2150 [inline]
__se_sys_sendto net/socket.c:2146 [inline]
__x64_sys_sendto+0xe5/0x100 net/socket.c:2146
x64_sys_call+0x15c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Second to last potentially related work creation:
kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:486
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
__call_rcu_common kernel/rcu/tree.c:2806 [inline]
call_rcu+0xee/0x1340 kernel/rcu/tree.c:2925
neigh_parms_release+0x1f2/0x230 net/core/neighbour.c:1751
addrconf_ifdown+0x1815/0x1ab0 net/ipv6/addrconf.c:3957
addrconf_notify+0x32f/0xe10
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:455
call_netdevice_notifiers_info net/core/dev.c:1978 [inline]
call_netdevice_notifiers_extack net/core/dev.c:2016 [inline]
call_netdevice_notifiers net/core/dev.c:2030 [inline]
unregister_netdevice_many+0xe2a/0x1740 net/core/dev.c:10890
unregister_netdevice_queue+0x2e6/0x350 net/core/dev.c:10821
unregister_netdevice include/linux/netdevice.h:3100 [inline]
__tun_detach+0xd14/0x1510 drivers/net/tun.c:685
tun_detach drivers/net/tun.c:701 [inline]
tun_chr_close+0x92/0x140 drivers/net/tun.c:3489
__fput+0x1e5/0x870 fs/file_table.c:320
____fput+0x15/0x20 fs/file_table.c:348
task_work_run+0x24d/0x2e0 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xbd5/0x2b80 kernel/exit.c:877
do_group_exit+0x21a/0x2d0 kernel/exit.c:1027
get_signal+0x169d/0x1820 kernel/signal.c:2880
arch_do_signal_or_restart+0xb0/0x16f0 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x74/0xa0 kernel/entry/common.c:174
exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x26/0x130 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
The buggy address belongs to the object at ffff8881298a6500
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 8 bytes inside of
192-byte region [ffff8881298a6500, ffff8881298a65c0)
The buggy address belongs to the physical page:
page:ffffea0004a62980 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1298a6
flags: 0x4000000000000200(slab|zone=1)
raw: 4000000000000200 ffffea000441be80 dead000000000004 ffff888100042c00
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 1217, tgid 1217 (syz-executor), ts 73822192331, free_ts 73765591020
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590
prep_new_page+0x1b/0x110 mm/page_alloc.c:2597
get_page_from_freelist+0x27ea/0x2870 mm/page_alloc.c:4425
__alloc_pages+0x3a1/0x780 mm/page_alloc.c:5714
alloc_slab_page+0x6c/0xf0
allocate_slab mm/slub.c:1962 [inline]
new_slab+0x90/0x3e0 mm/slub.c:2015
___slab_alloc+0x6f9/0xb80 mm/slub.c:3203
__slab_alloc+0x5d/0xa0 mm/slub.c:3302
slab_alloc_node mm/slub.c:3387 [inline]
__kmem_cache_alloc_node+0x1af/0x250 mm/slub.c:3460
__do_kmalloc_node mm/slab_common.c:956 [inline]
__kmalloc+0xa3/0x1e0 mm/slab_common.c:970
kmalloc include/linux/slab.h:561 [inline]
kzalloc include/linux/slab.h:692 [inline]
ops_init+0x8e/0x480 net/core/net_namespace.c:128
setup_net+0x4ca/0xd60 net/core/net_namespace.c:335
copy_net_ns+0x35f/0x5b0 net/core/net_namespace.c:481
create_new_namespaces+0x416/0x670 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x126/0x180 kernel/nsproxy.c:226
ksys_unshare+0x542/0xa00 kernel/fork.c:3312
page last free stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
free_pages_prepare mm/page_alloc.c:1498 [inline]
free_pcp_prepare mm/page_alloc.c:1572 [inline]
free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3498
free_unref_page+0xb2/0x5c0 mm/page_alloc.c:3594
free_the_page mm/page_alloc.c:798 [inline]
__free_pages+0x61/0xf0 mm/page_alloc.c:5803
__vunmap+0x9f3/0xb60 mm/vmalloc.c:2728
__vfree mm/vmalloc.c:2776 [inline]
vfree+0x5c/0x80 mm/vmalloc.c:2807
kcov_put kernel/kcov.c:428 [inline]
kcov_close+0x2b/0x50 kernel/kcov.c:524
__fput+0x1e5/0x870 fs/file_table.c:320
____fput+0x15/0x20 fs/file_table.c:348
task_work_run+0x24d/0x2e0 kernel/task_work.c:179
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xbd5/0x2b80 kernel/exit.c:877
do_group_exit+0x21a/0x2d0 kernel/exit.c:1027
get_signal+0x169d/0x1820 kernel/signal.c:2880
arch_do_signal_or_restart+0xb0/0x16f0 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x74/0xa0 kernel/entry/common.c:174
exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x26/0x130 kernel/entry/common.c:303
Memory state around the buggy address:
ffff8881298a6400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8881298a6480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8881298a6500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881298a6580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8881298a6600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
general protection fault, probably for non-canonical address 0xe0b04d43dedc0155: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x05828a1ef6e00aa8-0x05828a1ef6e00aaf]
CPU: 0 PID: 16973 Comm: syz.2.3960 Tainted: G B 6.1.99-syzkaller-00108-gd4dab27b9d1c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:bq_enqueue kernel/bpf/cpumap.c:751 [inline]
RIP: 0010:cpu_map_enqueue+0x113/0x370 kernel/bpf/cpumap.c:775
Code: e8 03 42 80 3c 30 00 74 08 48 89 df e8 16 d4 24 00 4c 8b 23 4f 8d 74 3c 58 4d 89 f5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 44 05 00 84 c0 0f 85 a8 01 00 00 4d 01 fc 41 8b 1e bf 08
RSP: 0018:ffffc90000f8f7a8 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffffffff86745880 RCX: 0000000000040000
RDX: ffffc90002033000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc90000f8f7e0 R08: ffffffff81980e9e R09: fffffbfff0f6dafd
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6e00000
R13: 00b05143dedc0155 R14: 05828a1ef6e00aad R15: 0583019d00000a55
FS: 00007f12a3a376c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f12a3a36f98 CR3: 0000000135200000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__xdp_do_redirect_frame net/core/filter.c:4291 [inline]
xdp_do_redirect+0x5b0/0xc60 net/core/filter.c:4335
tun_xdp_act+0xdb/0xc00 drivers/net/tun.c:1625
tun_build_skb drivers/net/tun.c:1715 [inline]
tun_get_user+0xb35/0x3a90 drivers/net/tun.c:1818
tun_chr_write_iter+0x129/0x210 drivers/net/tun.c:2044
call_write_iter include/linux/fs.h:2274 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0xaf6/0xed0 fs/read_write.c:584
ksys_write+0x199/0x2c0 fs/read_write.c:637
__do_sys_write fs/read_write.c:649 [inline]
__se_sys_write fs/read_write.c:646 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:646
x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f12a2b7cadf
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48
RSP: 002b:00007f12a3a37000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f12a2d36058 RCX: 00007f12a2b7cadf
RDX: 000000000000003e RSI: 0000000020002340 RDI: 00000000000000c8
RBP: 00007f12a2bf0296 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000003e R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f12a2d36058 R15: 00007ffd4a2f5058
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bq_enqueue kernel/bpf/cpumap.c:751 [inline]
RIP: 0010:cpu_map_enqueue+0x113/0x370 kernel/bpf/cpumap.c:775
Code: e8 03 42 80 3c 30 00 74 08 48 89 df e8 16 d4 24 00 4c 8b 23 4f 8d 74 3c 58 4d 89 f5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 44 05 00 84 c0 0f 85 a8 01 00 00 4d 01 fc 41 8b 1e bf 08
RSP: 0018:ffffc90000f8f7a8 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: ffffffff86745880 RCX: 0000000000040000
RDX: ffffc90002033000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc90000f8f7e0 R08: ffffffff81980e9e R09: fffffbfff0f6dafd
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881f6e00000
R13: 00b05143dedc0155 R14: 05828a1ef6e00aad R15: 0583019d00000a55
FS: 00007f12a3a376c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f12a3a36f98 CR3: 0000000135200000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 03 42 80 3c call 0x3c804208
5: 30 00 xor %al,(%rax)
7: 74 08 je 0x11
9: 48 89 df mov %rbx,%rdi
c: e8 16 d4 24 00 call 0x24d427
11: 4c 8b 23 mov (%rbx),%r12
14: 4f 8d 74 3c 58 lea 0x58(%r12,%r15,1),%r14
19: 4d 89 f5 mov %r14,%r13
1c: 49 c1 ed 03 shr $0x3,%r13
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 41 0f b6 44 05 00 movzbl 0x0(%r13,%rax,1),%eax <-- trapping instruction
30: 84 c0 test %al,%al
32: 0f 85 a8 01 00 00 jne 0x1e0
38: 4d 01 fc add %r15,%r12
3b: 41 8b 1e mov (%r14),%ebx
3e: bf .byte 0xbf
3f: 08 .byte 0x8