================================================================== 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 49 at addr ffff8880157b5c00 by task syz-executor.0/14194 CPU: 0 PID: 14194 Comm: syz-executor.0 Not tainted 5.15.0-rc5-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: 0033:0x7f926fb5ba39 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:00007f926d0b0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f926fc5f020 RCX: 00007f926fb5ba39 RDX: 0000000000000038 RSI: 0000000020000040 RDI: 0000000000000019 RBP: 00007f926fbb5c5f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5a9675df R14: 00007f926d0b0300 R15: 0000000000022000 Allocated by task 14194: 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:4439 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 ffff8880157b5c00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff8880157b5c00, ffff8880157b5c40) The buggy address belongs to the page: page:ffffea000055ed40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x157b5 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001c1e140 0000001b00000018 ffff888011041640 raw: 0000000000000000 0000000000200020 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 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 8516, ts 164812297910, free_ts 164772708010 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:1763 [inline] allocate_slab+0xcc/0x4d0 mm/slub.c:1900 new_slab mm/slub.c:1963 [inline] ___slab_alloc+0x41e/0xc40 mm/slub.c:2994 __slab_alloc mm/slub.c:3081 [inline] slab_alloc_node mm/slub.c:3172 [inline] slab_alloc mm/slub.c:3214 [inline] __kmalloc+0x2e9/0x370 mm/slub.c:4387 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] tomoyo_encode2+0x25a/0x560 security/tomoyo/realpath.c:45 tomoyo_encode security/tomoyo/realpath.c:80 [inline] tomoyo_realpath_from_path+0x5c3/0x610 security/tomoyo/realpath.c:288 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x238/0x660 security/tomoyo/file.c:822 security_inode_getattr+0xc0/0x140 security/security.c:1333 vfs_getattr fs/stat.c:157 [inline] vfs_fstat fs/stat.c:182 [inline] __do_sys_newfstat fs/stat.c:422 [inline] __se_sys_newfstat+0xd1/0x820 fs/stat.c:419 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 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+0x7d/0x580 mm/page_alloc.c:3394 free_slab mm/slub.c:2003 [inline] discard_slab mm/slub.c:2009 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2495 put_cpu_partial+0x132/0x1a0 mm/slub.c:2575 do_slab_free mm/slub.c:3471 [inline] ___cache_free+0xe6/0x120 mm/slub.c:3490 qlist_free_all mm/kasan/quarantine.c:165 [inline] kasan_quarantine_reduce+0x151/0x1c0 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3214 [inline] __kmalloc+0x1e7/0x370 mm/slub.c:4387 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] fib_create_info+0x16fb/0x7120 net/ipv4/fib_semantics.c:1417 fib_table_insert+0x2a8/0x24e0 net/ipv4/fib_trie.c:1224 fib_magic+0x447/0x610 net/ipv4/fib_frontend.c:1087 fib_netdev_event+0x718/0x860 net/ipv4/fib_frontend.c:1466 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:391 __dev_notify_flags+0x306/0x5e0 dev_change_flags+0xe3/0x190 net/core/dev.c:8837 do_setlink+0xe12/0x4300 net/core/rtnetlink.c:2719 Memory state around the buggy address: ffff8880157b5b00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880157b5b80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff8880157b5c00: 00 00 00 00 03 fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880157b5c80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880157b5d00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================