================================================================== 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 lib/usercopy.c:32 [inline] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0xc7/0x150 lib/usercopy.c:26 Read of size 42 at addr ffff8880712dce80 by task syz-executor.2/24809 CPU: 1 PID: 24809 Comm: syz-executor.2 Not tainted 5.15.0-rc7-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+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_copy_to_user include/linux/instrumented.h:118 [inline] _copy_to_user lib/usercopy.c:32 [inline] _copy_to_user+0xc7/0x150 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:200 [inline] __htab_map_lookup_and_delete_batch+0xf19/0x1900 kernel/bpf/hashtab.c:1768 bpf_map_do_batch+0x3d5/0x510 kernel/bpf/syscall.c:4179 __sys_bpf+0x2706/0x5df0 kernel/bpf/syscall.c:4650 __do_sys_bpf kernel/bpf/syscall.c:4694 [inline] __se_sys_bpf kernel/bpf/syscall.c:4692 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4692 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f1055828ae9 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:00007f1052d7d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f105593c020 RCX: 00007f1055828ae9 RDX: 0000000000000038 RSI: 0000000020000040 RDI: 0000000000000019 RBP: 00007f1055882f25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd7486cfff R14: 00007f1052d7d300 R15: 0000000000022000 Allocated by task 24809: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa4/0xd0 mm/kasan/common.c:522 kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x61/0x120 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+0x525/0x1900 kernel/bpf/hashtab.c:1647 bpf_map_do_batch+0x3d5/0x510 kernel/bpf/syscall.c:4179 __sys_bpf+0x2706/0x5df0 kernel/bpf/syscall.c:4650 __do_sys_bpf kernel/bpf/syscall.c:4694 [inline] __se_sys_bpf kernel/bpf/syscall.c:4692 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4692 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff8880712dce80 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff8880712dce80, ffff8880712dcec0) The buggy address belongs to the page: page:ffffea0001c4b700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x712dc flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00004cfcc0 0000000700000007 ffff888010c41640 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 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 6467, ts 284264533030, free_ts 284259803856 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4155 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5381 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191 alloc_slab_page mm/slub.c:1770 [inline] allocate_slab mm/slub.c:1907 [inline] new_slab+0x319/0x490 mm/slub.c:1970 ___slab_alloc+0x950/0x1050 mm/slub.c:3001 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3088 slab_alloc_node mm/slub.c:3179 [inline] slab_alloc mm/slub.c:3221 [inline] __kmalloc_track_caller+0x2f1/0x310 mm/slub.c:4916 kmemdup+0x23/0x50 mm/util.c:128 kmemdup include/linux/fortify-string.h:270 [inline] sctp_addr_wq_mgmt+0x417/0x7d0 net/sctp/protocol.c:752 sctp_inet6addr_event+0x6e5/0x910 net/sctp/ipv6.c:94 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 atomic_notifier_call_chain+0x70/0x180 kernel/notifier.c:198 ipv6_add_addr+0x1705/0x1f00 net/ipv6/addrconf.c:1159 add_addr+0xcf/0x330 net/ipv6/addrconf.c:3084 add_v4_addrs+0x565/0x830 net/ipv6/addrconf.c:3146 addrconf_gre_config net/ipv6/addrconf.c:3420 [inline] addrconf_notify+0x9b7/0x1bb0 net/ipv6/addrconf.c:3600 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1391 free_unref_page_prepare mm/page_alloc.c:3317 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3396 mm_free_pgd kernel/fork.c:648 [inline] __mmdrop+0xcb/0x3f0 kernel/fork.c:699 mmdrop include/linux/sched/mm.h:49 [inline] __mmput+0x3f1/0x4b0 kernel/fork.c:1125 mmput+0x58/0x60 kernel/fork.c:1136 free_bprm+0x65/0x2e0 fs/exec.c:1483 kernel_execve+0x380/0x460 fs/exec.c:1980 call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff8880712dcd80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8880712dce00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff8880712dce80: 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880712dcf00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8880712dcf80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ==================================================================