================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:359 [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+0x7e5/0x12d0 drivers/tty/vt/vt.c:1250 Read of size 192 at addr ffff888098b43b40 by task syz-executor.2/14855 CPU: 0 PID: 14855 Comm: syz-executor.2 Not tainted 5.2.0-rc4-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+0x113/0x167 lib/dump_stack.c:113 print_address_description.cold.5+0x9/0x1ff mm/kasan/report.c:188 __kasan_report.cold.6+0x1b/0x39 mm/kasan/report.c:317 kasan_report+0x12/0x20 mm/kasan/common.c:614 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/generic.c:191 memcpy+0x23/0x50 mm/kasan/common.c:124 memcpy include/linux/string.h:359 [inline] scr_memcpyw include/linux/vt_buffer.h:49 [inline] vc_do_resize+0x7e5/0x12d0 drivers/tty/vt/vt.c:1250 vc_resize+0x3d/0x60 drivers/tty/vt/vt.c:1304 fbcon_modechanged+0x301/0x740 drivers/video/fbdev/core/fbcon.c:2960 fbcon_update_vcs+0x15/0x20 drivers/video/fbdev/core/fbcon.c:3018 fb_set_var+0x989/0xec0 drivers/video/fbdev/core/fbmem.c:1051 do_fb_ioctl+0x684/0x930 drivers/video/fbdev/core/fbmem.c:1116 fb_ioctl+0xcb/0x150 drivers/video/fbdev/core/fbmem.c:1220 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:696 ksys_ioctl+0x62/0x90 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718 do_syscall_64+0xd0/0x530 arch/x86/entry/common.c:301 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:00007fa83bffcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa83bffd6d4 RCX: 000000000045b349 RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000002cd R14: 00000000004c3dc6 R15: 000000000075bf2c Allocated by task 14855: save_stack+0x21/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc.constprop.12+0xc7/0xd0 mm/kasan/common.c:489 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503 __do_kmalloc mm/slab.c:3660 [inline] __kmalloc+0x15d/0x760 mm/slab.c:3669 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:742 [inline] vc_do_resize+0x1de/0x12d0 drivers/tty/vt/vt.c:1187 vc_resize+0x3d/0x60 drivers/tty/vt/vt.c:1304 fbcon_modechanged+0x301/0x740 drivers/video/fbdev/core/fbcon.c:2960 fbcon_update_vcs+0x15/0x20 drivers/video/fbdev/core/fbcon.c:3018 fb_set_var+0x989/0xec0 drivers/video/fbdev/core/fbmem.c:1051 fbcon_resize+0x55e/0x6c0 drivers/video/fbdev/core/fbcon.c:2202 resize_screen drivers/tty/vt/vt.c:1126 [inline] vc_do_resize+0x38b/0x12d0 drivers/tty/vt/vt.c:1205 vc_resize+0x3d/0x60 drivers/tty/vt/vt.c:1304 fbcon_modechanged+0x301/0x740 drivers/video/fbdev/core/fbcon.c:2960 fbcon_update_vcs+0x15/0x20 drivers/video/fbdev/core/fbcon.c:3018 fb_set_var+0x989/0xec0 drivers/video/fbdev/core/fbmem.c:1051 do_fb_ioctl+0x684/0x930 drivers/video/fbdev/core/fbmem.c:1116 fb_ioctl+0xcb/0x150 drivers/video/fbdev/core/fbmem.c:1220 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:696 ksys_ioctl+0x62/0x90 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:718 do_syscall_64+0xd0/0x530 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 13558: save_stack+0x21/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3432 [inline] kfree+0xcf/0x220 mm/slab.c:3755 tomoyo_find_next_domain+0x670/0x1c83 security/tomoyo/domain.c:880 tomoyo_bprm_check_security+0xfe/0x180 security/tomoyo/tomoyo.c:107 security_bprm_check+0x3a/0x80 security/security.c:747 search_binary_handler+0x58/0x630 fs/exec.c:1645 exec_binprm fs/exec.c:1701 [inline] __do_execve_file.isra.33+0x1286/0x2000 fs/exec.c:1821 do_execveat_common fs/exec.c:1868 [inline] do_execve fs/exec.c:1885 [inline] __do_sys_execve fs/exec.c:1961 [inline] __se_sys_execve fs/exec.c:1956 [inline] __x64_sys_execve+0x8a/0xb0 fs/exec.c:1956 do_syscall_64+0xd0/0x530 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888098b43a00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 320 bytes inside of 512-byte region [ffff888098b43a00, ffff888098b43c00) The buggy address belongs to the page: page:ffffea000262d0c0 refcount:1 mapcount:0 mapping:ffff8880aa400940 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002967188 ffffea000268fbc8 ffff8880aa400940 raw: 0000000000000000 ffff888098b43000 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888098b43a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888098b43b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888098b43b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888098b43c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888098b43c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================