audit: type=1800 audit(1589038679.710:345): pid=23329 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="syz-executor.2" name="file0" dev="sda1" ino=17112 res=0 ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:348 [inline] BUG: KASAN: slab-out-of-bounds in soft_cursor+0x448/0xa20 drivers/video/fbdev/core/softcursor.c:70 Read of size 8 at addr ffff888085b75dd0 by task syz-executor.0/23333 CPU: 0 PID: 23333 Comm: syz-executor.0 Not tainted 4.19.121-syzkaller #0 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+0x188/0x20d lib/dump_stack.c:118 print_address_description.cold+0x7c/0x212 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x88/0x2b9 mm/kasan/report.c:396 memcpy+0x20/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:348 [inline] soft_cursor+0x448/0xa20 drivers/video/fbdev/core/softcursor.c:70 bit_cursor+0x1230/0x1900 drivers/video/fbdev/core/bitblit.c:386 fbcon_cursor+0x572/0x760 drivers/video/fbdev/core/fbcon.c:1372 hide_cursor+0x85/0x2c0 drivers/tty/vt/vt.c:897 redraw_screen+0x2ed/0x870 drivers/tty/vt/vt.c:1001 vc_do_resize+0x108e/0x1380 drivers/tty/vt/vt.c:1312 vt_ioctl+0x1fa2/0x2500 drivers/tty/vt/vt_ioctl.c:901 tty_ioctl+0x7a1/0x1420 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c829 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f344400fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004f28a0 RCX: 000000000045c829 RDX: 00000000200000c0 RSI: 000000000000560a RDI: 0000000000000005 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000673 R14: 00000000004c9481 R15: 00007f34440106d4 Allocated by task 30267: set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:531 __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15b/0x770 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] fbcon_set_font+0x331/0x870 drivers/video/fbdev/core/fbcon.c:2644 con_font_set drivers/tty/vt/vt.c:4524 [inline] con_font_op+0xd3e/0x1130 drivers/tty/vt/vt.c:4589 vt_ioctl+0xcd0/0x2500 drivers/tty/vt/vt_ioctl.c:928 tty_ioctl+0x7a1/0x1420 drivers/tty/tty_io.c:2669 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9970: set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/kasan.c:521 __cache_free mm/slab.c:3503 [inline] kfree+0xce/0x220 mm/slab.c:3822 skb_free_head+0x91/0xb0 net/core/skbuff.c:554 skb_release_data+0x600/0x8c0 net/core/skbuff.c:574 skb_release_all+0x46/0x60 net/core/skbuff.c:631 __kfree_skb net/core/skbuff.c:645 [inline] consume_skb net/core/skbuff.c:705 [inline] consume_skb+0xda/0x380 net/core/skbuff.c:699 arp_process+0xafa/0x2580 net/ipv4/arp.c:919 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] arp_rcv net/ipv4/arp.c:965 [inline] arp_rcv+0x66a/0x860 net/ipv4/arp.c:940 __netif_receive_skb_one_core+0xf5/0x160 net/core/dev.c:4950 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5062 process_backlog+0x233/0x7c0 net/core/dev.c:5844 napi_poll net/core/dev.c:6267 [inline] net_rx_action+0x4ab/0xfc0 net/core/dev.c:6333 __do_softirq+0x26c/0x93c kernel/softirq.c:292 The buggy address belongs to the object at ffff888085b75cc0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 272 bytes inside of 512-byte region [ffff888085b75cc0, ffff888085b75ec0) The buggy address belongs to the page: page:ffffea000216dd40 count:1 mapcount:0 mapping:ffff88812c39c940 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea00025cf748 ffffea00022d5c88 ffff88812c39c940 raw: 0000000000000000 ffff888085b75040 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888085b75c80: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff888085b75d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888085b75d80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ^ ffff888085b75e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888085b75e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== pit: kvm: requested 108952 ns i8254 timer period limited to 200000 ns pit: kvm: requested 108952 ns i8254 timer period limited to 200000 ns pit: kvm: requested 108952 ns i8254 timer period limited to 200000 ns pit: kvm: requested 108952 ns i8254 timer period limited to 200000 ns pit: kvm: requested 108952 ns i8254 timer period limited to 200000 ns pit: kvm: requested 108952 ns i8254 timer period limited to 200000 ns pit: kvm: requested 108952 ns i8254 timer period limited to 200000 ns pit: kvm: requested 108952 ns i8254 timer period limited to 200000 ns pit: kvm: requested 108952 ns i8254 timer period limited to 200000 ns pit: kvm: requested 108952 ns i8254 timer period limited to 200000 ns