================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/fortify-string.h:191 [inline] BUG: KASAN: slab-out-of-bounds in page_to_skb+0x5cf/0xb70 drivers/net/virtio_net.c:480 Read of size 12 at addr ffff88802b64f800 by task systemd-udevd/6412 CPU: 1 PID: 6412 Comm: systemd-udevd Not tainted 5.12.0-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:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 check_region_inline mm/kasan/generic.c:180 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186 memcpy+0x20/0x60 mm/kasan/shadow.c:65 memcpy include/linux/fortify-string.h:191 [inline] page_to_skb+0x5cf/0xb70 drivers/net/virtio_net.c:480 receive_mergeable drivers/net/virtio_net.c:1009 [inline] receive_buf+0x2b82/0x6220 drivers/net/virtio_net.c:1119 virtnet_receive drivers/net/virtio_net.c:1411 [inline] virtnet_poll+0x568/0x10b0 drivers/net/virtio_net.c:1516 __napi_poll+0xaf/0x440 net/core/dev.c:6962 napi_poll net/core/dev.c:7029 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7116 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu kernel/softirq.c:422 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:434 common_interrupt+0xa4/0xd0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:623 RIP: 0010:call_rcu+0x2e2/0x740 kernel/rcu/tree.c:3115 Code: 48 03 85 10 01 00 00 48 39 c2 0f 8f a8 01 00 00 e8 93 f5 18 00 9c 58 f6 c4 02 0f 85 7d 01 00 00 4d 85 ed 74 01 fb 48 83 c4 18 <5b> 5d 41 5c 41 5d 41 5e 41 5f c3 80 3c 02 00 0f 84 25 ff ff ff 4c RSP: 0018:ffffc900092cf908 EFLAGS: 00000282 RAX: 0000000000000002 RBX: ffff88802f40be88 RCX: 1ffffffff1b8ba39 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8880b9d360c0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8179e5a8 R11: 0000000000000000 R12: ffff8880b9d361d0 R13: 0000000000000200 R14: ffff8880b9d361a0 R15: ffff8880b9d36158 dentry_free+0xc3/0x160 fs/dcache.c:350 __dentry_kill+0x4cb/0x640 fs/dcache.c:594 dentry_kill fs/dcache.c:718 [inline] dput+0x63a/0xbc0 fs/dcache.c:886 handle_mounts fs/namei.c:1475 [inline] step_into+0xd81/0x1c80 fs/namei.c:1773 open_last_lookups fs/namei.c:3314 [inline] path_openat+0x491/0x27e0 fs/namei.c:3497 do_filp_open+0x190/0x3d0 fs/namei.c:3527 do_sys_openat2+0x16d/0x420 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_open fs/open.c:1211 [inline] __se_sys_open fs/open.c:1207 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1207 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fce1af936f0 Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 19 30 2c 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 fe 9d 01 00 48 89 04 24 RSP: 002b:00007ffce26bbce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055f6526ce780 RCX: 00007fce1af936f0 RDX: 00000000000001b6 RSI: 0000000000080000 RDI: 00007ffce26bbe90 RBP: 0000000000000008 R08: 0000000000000008 R09: 0000000000000001 R10: 0000000000080000 R11: 0000000000000246 R12: 000055f650b0b68a R13: 0000000000000001 R14: 00007ffce26bbe90 R15: 00007ffce26bbef0 Allocated by task 1: 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:427 [inline] __kasan_slab_alloc+0x75/0x90 mm/kasan/common.c:460 kasan_slab_alloc include/linux/kasan.h:223 [inline] slab_post_alloc_hook mm/slab.h:516 [inline] slab_alloc_node mm/slub.c:2907 [inline] slab_alloc mm/slub.c:2915 [inline] kmem_cache_alloc+0x155/0x370 mm/slub.c:2920 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags fs/namei.c:2735 [inline] user_path_at_empty+0xa1/0x100 fs/namei.c:2735 user_path_at include/linux/namei.h:60 [inline] vfs_statx+0x142/0x390 fs/stat.c:195 vfs_fstatat fs/stat.c:217 [inline] vfs_lstat include/linux/fs.h:3240 [inline] __do_sys_newlstat+0x91/0x110 fs/stat.c:372 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 1: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kmem_cache_free+0x8a/0x740 mm/slub.c:3177 putname+0xe1/0x120 fs/namei.c:259 filename_lookup+0x3c3/0x570 fs/namei.c:2465 user_path_at include/linux/namei.h:60 [inline] vfs_statx+0x142/0x390 fs/stat.c:195 vfs_fstatat fs/stat.c:217 [inline] vfs_lstat include/linux/fs.h:3240 [inline] __do_sys_newlstat+0x91/0x110 fs/stat.c:372 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88802b64e600 which belongs to the cache names_cache of size 4096 The buggy address is located 512 bytes to the right of 4096-byte region [ffff88802b64e600, ffff88802b64f600) The buggy address belongs to the page: page:ffffea0000ad9200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2b648 head:ffffea0000ad9200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff8880109bd140 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88802b64f700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802b64f780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802b64f800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88802b64f880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802b64f900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================