audit: type=1400 audit(1575756543.617:36): avc: denied { map } for pid=7604 comm="syz-executor052" path="/root/syz-executor052727936" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
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BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:674 [inline]
BUG: KASAN: global-out-of-bounds in fb_pad_aligned_buffer+0x138/0x160 drivers/video/fbdev/core/fbmem.c:122
Read of size 1 at addr ffffffff87ecb836 by task syz-executor052/7604
CPU: 1 PID: 7604 Comm: syz-executor052 Not tainted 4.19.88-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.cold+0x5/0x20d 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+0x8c/0x2ba mm/kasan/report.c:396
__asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430
__fb_pad_aligned_buffer include/linux/fb.h:674 [inline]
fb_pad_aligned_buffer+0x138/0x160 drivers/video/fbdev/core/fbmem.c:122
bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:99 [inline]
bit_putcs+0xd14/0xf10 drivers/video/fbdev/core/bitblit.c:185
fbcon_putcs+0x42b/0x4f0 drivers/video/fbdev/core/fbcon.c:1320
do_update_region+0x42b/0x6f0 drivers/tty/vt/vt.c:677
redraw_screen+0x602/0x8e0 drivers/tty/vt/vt.c:1013
fbcon_do_set_font+0x73a/0xa40 drivers/video/fbdev/core/fbcon.c:2583
fbcon_copy_font+0x12c/0x190 drivers/video/fbdev/core/fbcon.c:2598
con_font_copy drivers/tty/vt/vt.c:4548 [inline]
con_font_op+0x69a/0x1250 drivers/tty/vt/vt.c:4563
vt_ioctl+0x1784/0x2530 drivers/tty/vt/vt_ioctl.c:965
tty_ioctl+0x7f3/0x1510 drivers/tty/tty_io.c:2669
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688
ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440269
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc34d461a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440269
RDX: 0000000020000000 RSI: 0000000000004b72 RDI: 0000000000000004
RBP: 00000000006cb018 R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401b50
R13: 0000000000401be0 R14: 0000000000000000 R15: 0000000000000000
The buggy address belongs to the variable:
oid_index+0x76/0xa60
Memory state around the buggy address:
ffffffff87ecb700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffffff87ecb780: 00 00 00 05 fa fa fa fa 00 00 00 00 00 00 00 00
>ffffffff87ecb800: 00 00 00 00 00 00 06 fa fa fa fa fa 00 02 fa fa
^
ffffffff87ecb880: fa fa fa fa 00 01 fa fa fa fa fa fa 00 00 02 fa
ffffffff87ecb900: fa fa fa fa 00 03 fa fa fa fa fa fa 00 06 fa fa
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