================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:380 [inline] BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49 [inline] BUG: KASAN: slab-out-of-bounds in vc_do_resize+0x959/0x1460 drivers/tty/vt/vt.c:1250 Read of size 192 at addr ffff8880a3f85940 by task syz-executor.0/9662 CPU: 0 PID: 9662 Comm: syz-executor.0 Not tainted 5.5.0-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:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:639 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192 memcpy+0x24/0x50 mm/kasan/common.c:125 memcpy include/linux/string.h:380 [inline] scr_memcpyw include/linux/vt_buffer.h:49 [inline] vc_do_resize+0x959/0x1460 drivers/tty/vt/vt.c:1250 vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1304 fbcon_modechanged+0x367/0x790 drivers/video/fbdev/core/fbcon.c:2980 fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3038 fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1051 do_fb_ioctl+0x390/0x7d0 drivers/video/fbdev/core/fbmem.c:1104 fb_ioctl+0xe6/0x130 drivers/video/fbdev/core/fbmem.c:1180 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8865c72c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f8865c736d4 RCX: 000000000045b349 RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000002cd R14: 00000000004c3dc6 R15: 000000000075bf2c Allocated by task 9662: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x163/0x770 mm/slab.c:3665 kmalloc include/linux/slab.h:561 [inline] kzalloc include/linux/slab.h:670 [inline] vc_do_resize+0x262/0x1460 drivers/tty/vt/vt.c:1187 vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1304 fbcon_modechanged+0x367/0x790 drivers/video/fbdev/core/fbcon.c:2980 fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3038 fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1051 fbcon_resize+0x6b1/0x780 drivers/video/fbdev/core/fbcon.c:2222 resize_screen drivers/tty/vt/vt.c:1126 [inline] vc_do_resize+0x440/0x1460 drivers/tty/vt/vt.c:1205 vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1304 fbcon_modechanged+0x367/0x790 drivers/video/fbdev/core/fbcon.c:2980 fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:3038 fb_set_var+0xb32/0xdd0 drivers/video/fbdev/core/fbmem.c:1051 do_fb_ioctl+0x390/0x7d0 drivers/video/fbdev/core/fbmem.c:1104 fb_ioctl+0xe6/0x130 drivers/video/fbdev/core/fbmem.c:1180 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9469: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:335 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 skb_free_head+0x93/0xb0 net/core/skbuff.c:591 skb_release_data+0x551/0x8d0 net/core/skbuff.c:611 skb_release_all+0x4d/0x60 net/core/skbuff.c:665 __kfree_skb net/core/skbuff.c:679 [inline] consume_skb net/core/skbuff.c:838 [inline] consume_skb+0xfb/0x410 net/core/skbuff.c:832 unix_stream_read_generic+0x18ec/0x1de0 net/unix/af_unix.c:2363 unix_stream_recvmsg+0xc3/0x100 net/unix/af_unix.c:2421 sock_recvmsg_nosec net/socket.c:873 [inline] sock_recvmsg net/socket.c:891 [inline] sock_recvmsg+0xce/0x110 net/socket.c:887 sock_read_iter+0x2f8/0x420 net/socket.c:969 call_read_iter include/linux/fs.h:1896 [inline] new_sync_read+0x680/0x800 fs/read_write.c:414 __vfs_read+0xe1/0x110 fs/read_write.c:427 vfs_read+0x1f0/0x440 fs/read_write.c:461 ksys_read+0x220/0x290 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read fs/read_write.c:595 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:595 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a3f85800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 320 bytes inside of 512-byte region [ffff8880a3f85800, ffff8880a3f85a00) The buggy address belongs to the page: page:ffffea00028fe140 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0 raw: 00fffe0000000200 ffffea00029f71c8 ffffea00029463c8 ffff8880aa400a80 raw: 0000000000000000 ffff8880a3f85000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a3f85880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a3f85900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880a3f85980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a3f85a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a3f85a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================