================================================================== BUG: KASAN: slab-out-of-bounds in instrument_copy_to_user include/linux/instrumented.h:118 [inline] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0xe1/0x130 lib/usercopy.c:32 Read of size 42 at addr ffff888043397200 by task syz-executor.5/32730 CPU: 1 PID: 32730 Comm: syz-executor.5 Not tainted 5.15.0-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:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x66/0x3e0 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:459 kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:189 instrument_copy_to_user include/linux/instrumented.h:118 [inline] _copy_to_user+0xe1/0x130 lib/usercopy.c:32 copy_to_user include/linux/uaccess.h:200 [inline] __htab_map_lookup_and_delete_batch+0x1a63/0x2160 kernel/bpf/hashtab.c:1768 bpf_map_do_batch+0x396/0x490 __sys_bpf+0xde4/0x12c70 __do_sys_bpf kernel/bpf/syscall.c:4691 [inline] __se_sys_bpf kernel/bpf/syscall.c:4689 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4689 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f379bc8aa39 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f37991df188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f379bd8e020 RCX: 00007f379bc8aa39 RDX: 0000000000000038 RSI: 0000000020000040 RDI: 0000000000000019 RBP: 00007f379bce4c5f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd37afe23f R14: 00007f37991df300 R15: 0000000000022000 Allocated by task 32730: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc_node+0x288/0x400 mm/slub.c:4448 kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x81/0x110 mm/util.c:587 kvmalloc include/linux/mm.h:805 [inline] kvmalloc_array include/linux/mm.h:823 [inline] __htab_map_lookup_and_delete_batch+0x43b/0x2160 kernel/bpf/hashtab.c:1647 bpf_map_do_batch+0x396/0x490 __sys_bpf+0xde4/0x12c70 __do_sys_bpf kernel/bpf/syscall.c:4691 [inline] __se_sys_bpf kernel/bpf/syscall.c:4689 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4689 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888043397200 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff888043397200, ffff888043397240) The buggy address belongs to the page: page:ffffea00010ce5c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x43397 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001bf7c40 0000000200000002 ffff888011041640 raw: 0000000000000000 0000000080200020 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 21658, ts 2269781730352, free_ts 2269779320054 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4153 __alloc_pages+0x255/0x580 mm/page_alloc.c:5375 alloc_slab_page mm/slub.c:1770 [inline] allocate_slab+0xcc/0x4d0 mm/slub.c:1907 new_slab mm/slub.c:1970 [inline] ___slab_alloc+0x41e/0xc40 mm/slub.c:3001 __slab_alloc mm/slub.c:3088 [inline] slab_alloc_node mm/slub.c:3179 [inline] slab_alloc mm/slub.c:3221 [inline] kmem_cache_alloc_trace+0x28a/0x310 mm/slub.c:3238 kmalloc include/linux/slab.h:591 [inline] ip_setup_cork+0x512/0x840 net/ipv4/ip_output.c:1244 ip_append_data+0x155/0x1a0 net/ipv4/ip_output.c:1303 icmp_push_reply+0x107/0x420 net/ipv4/icmp.c:374 __icmp_send+0x16cf/0x2810 net/ipv4/icmp.c:769 icmp_send include/net/icmp.h:43 [inline] __udp4_lib_rcv+0x16bc/0x2be0 net/ipv4/udp.c:2459 ip_protocol_deliver_rcu+0x1ed/0x3b0 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x316/0x490 net/ipv4/ip_input.c:252 __netif_receive_skb_one_core net/core/dev.c:5436 [inline] __netif_receive_skb+0x1d1/0x500 net/core/dev.c:5550 process_backlog+0x518/0x9a0 net/core/dev.c:6427 __napi_poll+0xba/0x4f0 net/core/dev.c:6986 napi_poll net/core/dev.c:7053 [inline] net_rx_action+0x61c/0xf30 net/core/dev.c:7140 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0xc29/0xd20 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page_list+0x11f/0xa50 mm/page_alloc.c:3431 release_pages+0x18cb/0x1b00 mm/swap.c:963 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu+0x780/0x910 mm/mmu_gather.c:249 tlb_finish_mmu+0xcb/0x200 mm/mmu_gather.c:340 exit_mmap+0x3dd/0x6f0 mm/mmap.c:3173 __mmput+0x111/0x3a0 kernel/fork.c:1115 free_bprm+0x136/0x2f0 fs/exec.c:1483 kernel_execve+0x740/0x9a0 fs/exec.c:1980 call_usermodehelper_exec_async+0x262/0x3b0 kernel/umh.c:112 ret_from_fork+0x1f/0x30 Memory state around the buggy address: ffff888043397100: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff888043397180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888043397200: 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc fc ^ ffff888043397280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888043397300: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ==================================================================