================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:406 [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+0x888/0x1370 drivers/tty/vt/vt.c:1280 Read of size 2 at addr ffff8880a8fad1b4 by task syz-executor.5/10263 CPU: 1 PID: 10263 Comm: syz-executor.5 Not tainted 5.7.0-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.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x141/0x190 mm/kasan/generic.c:192 memcpy+0x20/0x60 mm/kasan/common.c:105 memcpy include/linux/string.h:406 [inline] scr_memcpyw include/linux/vt_buffer.h:49 [inline] vc_do_resize+0x888/0x1370 drivers/tty/vt/vt.c:1280 fbcon_modechanged+0x36a/0x720 drivers/video/fbdev/core/fbcon.c:2989 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3047 fb_set_var+0xb03/0xd90 drivers/video/fbdev/core/fbmem.c:1056 do_fb_ioctl+0x390/0x6e0 drivers/video/fbdev/core/fbmem.c:1109 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca69 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:00007fdeec335c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e4b00 RCX: 000000000045ca69 RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000004 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000002f2 R14: 00000000004c5708 R15: 00007fdeec3366d4 Allocated by task 10263: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc mm/kasan/common.c:494 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x161/0x7a0 mm/slab.c:3665 kmalloc include/linux/slab.h:560 [inline] kzalloc include/linux/slab.h:669 [inline] vc_do_resize+0x245/0x1370 drivers/tty/vt/vt.c:1217 fbcon_modechanged+0x36a/0x720 drivers/video/fbdev/core/fbcon.c:2989 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3047 fb_set_var+0xb03/0xd90 drivers/video/fbdev/core/fbmem.c:1056 fbcon_resize+0x5a1/0x650 drivers/video/fbdev/core/fbcon.c:2231 resize_screen drivers/tty/vt/vt.c:1156 [inline] vc_do_resize+0x3ff/0x1370 drivers/tty/vt/vt.c:1235 fbcon_modechanged+0x36a/0x720 drivers/video/fbdev/core/fbcon.c:2989 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3047 fb_set_var+0xb03/0xd90 drivers/video/fbdev/core/fbmem.c:1056 do_fb_ioctl+0x390/0x6e0 drivers/video/fbdev/core/fbmem.c:1109 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 9841: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 call_usermodehelper_freeinfo kernel/umh.c:48 [inline] call_usermodehelper_exec+0x242/0x4d0 kernel/umh.c:609 call_modprobe kernel/kmod.c:99 [inline] __request_module+0x46c/0xb7f kernel/kmod.c:171 get_fs_type+0xcc/0x180 fs/filesystems.c:273 tomoyo_mount_acl+0x1fd/0x840 security/tomoyo/mount.c:125 tomoyo_mount_permission+0x151/0x3f0 security/tomoyo/mount.c:237 security_sb_mount+0x82/0xc0 security/security.c:916 do_mount+0x1b4/0x1b40 fs/namespace.c:3141 __do_sys_mount fs/namespace.c:3409 [inline] __se_sys_mount fs/namespace.c:3386 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3386 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 The buggy address belongs to the object at ffff8880a8fad100 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 180 bytes inside of 192-byte region [ffff8880a8fad100, ffff8880a8fad1c0) The buggy address belongs to the page: page:ffffea0002a3eb40 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a8fade00 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002356e08 ffffea0002a4bf08 ffff8880aa000000 raw: ffff8880a8fade00 ffff8880a8fad000 0000000100000009 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a8fad080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a8fad100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880a8fad180: 00 00 06 fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a8fad200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a8fad280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================