KASAN: vmalloc-out-of-bounds Write in sys

KASAN: vmalloc-out-of-bounds Write in sys_imageblit
Status: upstream: reported on 2019/12/10 16:38
Reported-by: syzbot+26dc38a00dc05118a4e6@syzkaller.appspotmail.com
First crash: 170d, last: 15d

Sample crash report:

==================================================================
BUG: KASAN: vmalloc-out-of-bounds in fast_imageblit drivers/video/fbdev/core/sysimgblt.c:229 [inline]
BUG: KASAN: vmalloc-out-of-bounds in sys_imageblit+0x1181/0x1240 drivers/video/fbdev/core/sysimgblt.c:275
Write of size 4 at addr ffffc900088e1000 by task syz-executor.1/27416

CPU: 2 PID: 27416 Comm: syz-executor.1 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
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+0x5/0x315 mm/kasan/report.c:382
 __kasan_report.cold+0x35/0x4d mm/kasan/report.c:511
 kasan_report+0x33/0x50 mm/kasan/common.c:625
 fast_imageblit drivers/video/fbdev/core/sysimgblt.c:229 [inline]
 sys_imageblit+0x1181/0x1240 drivers/video/fbdev/core/sysimgblt.c:275
 drm_fb_helper_sys_imageblit+0x1c/0x180 drivers/gpu/drm/drm_fb_helper.c:739
 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline]
 bit_putcs+0x910/0xe10 drivers/video/fbdev/core/bitblit.c:188
 fbcon_putcs+0x345/0x3f0 drivers/video/fbdev/core/fbcon.c:1362
 do_update_region+0x398/0x630 drivers/tty/vt/vt.c:677
 invert_screen+0x2a7/0x600 drivers/tty/vt/vt.c:794
 highlight drivers/tty/vt/selection.c:57 [inline]
 clear_selection drivers/tty/vt/selection.c:84 [inline]
 clear_selection+0x55/0x70 drivers/tty/vt/selection.c:80
 vc_do_resize+0xfd2/0x1340 drivers/tty/vt/vt.c:1224
 fbcon_do_set_font+0x4a0/0x950 drivers/video/fbdev/core/fbcon.c:2608
 fbcon_set_font+0x739/0x870 drivers/video/fbdev/core/fbcon.c:2705
 con_font_set drivers/tty/vt/vt.c:4565 [inline]
 con_font_op+0xd65/0x1160 drivers/tty/vt/vt.c:4630
 vt_ioctl+0xce5/0x26b0 drivers/tty/vt/vt_ioctl.c:928
 tty_ioctl+0xedc/0x1440 drivers/tty/tty_io.c:2656
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45c729
Code: bd b1 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 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f991f1cbc88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000072bf00 RCX: 000000000045c729
RDX: 0000000020000000 RSI: 0000000000004b61 RDI: 0000000000000003
RBP: 00007f991f1cc6d4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000041b R14: 00000000004ad9bc R15: 00000000006ed400


Memory state around the buggy address:
 ffffc900088e0f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900088e0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900088e1000: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
                   ^
 ffffc900088e1080: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
 ffffc900088e1100: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
==================================================================

Crashes (15):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci-qemu-upstream	2020/04/17 06:33	upstream	7a56db02	18397578	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream	2020/04/15 03:28	upstream	8632e9b5	3f3c5574	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream	2020/03/21 19:24	upstream	c63c50fc	78267cec	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream	2020/03/18 17:13	upstream	5076190d	0a96a13c	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream	2020/01/14 20:18	upstream	452424cd	fa12bd3c	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream	2020/01/14 19:54	upstream	452424cd	fa12bd3c	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream	2020/01/12 16:34	upstream	6327edce	53faa9fe	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream	2019/12/20 03:35	upstream	7e0165b2	36650b4b	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream	2019/12/17 10:41	upstream	ea200dec	2b31345f	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream	2019/12/10 15:24	upstream	6794862a	4b83c8fb	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream-386	2020/05/13 22:06	upstream	24085f70	a885920d	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream-386	2020/03/21 07:12	upstream	5ad0ec0b	aa6c6a55	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream-386	2020/03/18 17:22	upstream	5076190d	0a96a13c	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream-386	2019/12/21 17:04	upstream	62104694	bc586918	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org
ci-qemu-upstream-386	2019/12/20 16:04	upstream	7e0165b2	aa56acc6	.config	log	report	b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org