================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:352 [inline] BUG: KASAN: slab-out-of-bounds in queue_stack_map_push_elem+0x185/0x290 kernel/bpf/queue_stack_maps.c:230 Write of size 262146 at addr ffff8801bc989408 by task syz-executor467/5982 CPU: 0 PID: 5982 Comm: syz-executor467 Not tainted 4.20.0-rc1+ #153 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+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 memcpy+0x37/0x50 mm/kasan/kasan.c:303 memcpy include/linux/string.h:352 [inline] queue_stack_map_push_elem+0x185/0x290 kernel/bpf/queue_stack_maps.c:230 map_update_elem+0x605/0xf60 kernel/bpf/syscall.c:865 __do_sys_bpf kernel/bpf/syscall.c:2546 [inline] __se_sys_bpf kernel/bpf/syscall.c:2517 [inline] __x64_sys_bpf+0x32d/0x520 kernel/bpf/syscall.c:2517 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4400e9 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc2f089808 EFLAGS: 00000213 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400e9 RDX: 0000000000000020 RSI: 0000000020000040 RDI: 0000000000000002 RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401970 R13: 0000000000401a00 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 5982: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3684 [inline] __kmalloc_node+0x50/0x70 mm/slab.c:3691 kmalloc_node include/linux/slab.h:589 [inline] bpf_map_area_alloc+0x3f/0x90 kernel/bpf/syscall.c:147 queue_stack_map_alloc+0x192/0x290 kernel/bpf/queue_stack_maps.c:84 find_and_alloc_map kernel/bpf/syscall.c:129 [inline] map_create+0x3bd/0x1110 kernel/bpf/syscall.c:509 __do_sys_bpf kernel/bpf/syscall.c:2540 [inline] __se_sys_bpf kernel/bpf/syscall.c:2517 [inline] __x64_sys_bpf+0x303/0x520 kernel/bpf/syscall.c:2517 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 3750: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 kernfs_fop_release+0x12b/0x1a0 fs/kernfs/file.c:783 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801bc9892c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 328 bytes inside of 512-byte region [ffff8801bc9892c0, ffff8801bc9894c0) The buggy address belongs to the page: page:ffffea0006f26240 count:1 mapcount:0 mapping:ffff8801da800940 index:0x0 flags: 0x2fffc0000000200(slab) raw: 02fffc0000000200 ffffea0006f2e788 ffffea0006f26308 ffff8801da800940 raw: 0000000000000000 ffff8801bc989040 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801bc989300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801bc989380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801bc989400: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff8801bc989480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801bc989500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ==================================================================