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KASAN: vmalloc-out-of-bounds Write in imageblit (4)

Status: fixed on 2025/09/04 16:57
Subsystems: fbdev
[Documentation on labels]
Reported-by: syzbot+c4b7aa0513823e2ea880@syzkaller.appspotmail.com
Fix commit: af0db3c1f898 fbdev: Fix vmalloc out-of-bounds write in fast_imageblit
First crash: 421d, last: 38d
▶ ▼ Discussions (9)
Title Replies (including bot) Last reply
[PATCH] fbdev: Fix vmalloc out-of-bounds write in fast_imageblit 2 (2) 2025/08/02 19:30
[syzbot] [fbdev?] KASAN: vmalloc-out-of-bounds Write in imageblit (4) 0 (3) 2025/07/31 16:57
[syzbot] Monthly fbdev report (Jul 2025) 0 (1) 2025/07/14 07:22
[syzbot] Monthly fbdev report (Jun 2025) 0 (1) 2025/06/11 07:46
[syzbot] Monthly fbdev report (May 2025) 0 (1) 2025/05/12 06:34
[syzbot] Monthly fbdev report (Apr 2025) 0 (1) 2025/04/10 10:47
[syzbot] Monthly fbdev report (Mar 2025) 0 (1) 2025/03/09 12:42
[syzbot] Monthly fbdev report (Feb 2025) 0 (1) 2025/02/06 09:15
[syzbot] Monthly fbdev report (Dec 2024) 0 (1) 2024/12/02 12:47
▶ ▼ Similar bugs (7)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: vmalloc-out-of-bounds Write in imageblit fbdev 23 C 104 1447d 1740d 20/29 fixed on 2021/11/10 00:50
upstream KASAN: vmalloc-out-of-bounds Write in imageblit (5) fbdev 23 C 929 37m 34d 23/29 upstream: reported C repro on 2025/09/08 19:19
upstream KASAN: vmalloc-out-of-bounds Write in imageblit (3) fbdev 23 2 810d 806d 0/29 auto-obsoleted due to no activity on 2023/10/23 10:50
upstream KASAN: vmalloc-out-of-bounds Write in imageblit (2) fbdev 23 C done 701 1135d 1423d 22/29 fixed on 2023/02/24 13:50
upstream KASAN: vmalloc-out-of-bounds Write in sys_imageblit fbdev 23 C 91 1766d 2133d 0/29 auto-obsoleted due to no activity on 2022/12/09 01:09
upstream BUG: unable to handle kernel paging request in sys_imageblit fbdev 8 syz 16 1763d 2133d 0/29 auto-obsoleted due to no activity on 2022/08/31 01:46
upstream KASAN: stack-out-of-bounds Write in sys_imageblit fbdev 23 2 1811d 1909d 0/29 auto-closed as invalid on 2021/02/24 10:13
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2025/07/31 16:57 21m sravankumarlpu@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git c7fb1692dc0139f95bd4131d3d5fa5eba2ba569e OK log

Sample crash report:
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000001
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
 </TASK>
==================================================================
BUG: KASAN: vmalloc-out-of-bounds in fast_imageblit drivers/video/fbdev/core/sysimgblt.c:257 [inline]
BUG: KASAN: vmalloc-out-of-bounds in sys_imageblit+0x1ec6/0x2b00 drivers/video/fbdev/core/sysimgblt.c:326
Write of size 4 at addr ffffc90001c41000 by task syz-executor161/5103

CPU: 0 UID: 0 PID: 5103 Comm: syz-executor161 Not tainted 6.11.0-rc6-syzkaller-00048-gc7fb1692dc01 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 fast_imageblit drivers/video/fbdev/core/sysimgblt.c:257 [inline]
 sys_imageblit+0x1ec6/0x2b00 drivers/video/fbdev/core/sysimgblt.c:326
 drm_fbdev_shmem_defio_imageblit+0x2e/0x100 drivers/gpu/drm/drm_fbdev_shmem.c:39
 bit_putcs+0x18ba/0x1db0
 fbcon_putcs+0x255/0x390 drivers/video/fbdev/core/fbcon.c:1288
 do_update_region+0x396/0x450 drivers/tty/vt/vt.c:619
 redraw_screen+0x902/0xe90 drivers/tty/vt/vt.c:971
 con2fb_init_display drivers/video/fbdev/core/fbcon.c:794 [inline]
 set_con2fb_map+0xa6c/0x10a0 drivers/video/fbdev/core/fbcon.c:865
 fbcon_set_con2fb_map_ioctl+0x207/0x320 drivers/video/fbdev/core/fbcon.c:3092
 do_fb_ioctl+0x38f/0x7b0 drivers/video/fbdev/core/fb_chrdev.c:138
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feb9b353729
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 1a 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffde9b9f968 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffde9b9f980 RCX: 00007feb9b353729
RDX: 00000000200000c0 RSI: 0000000000004610 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffde9b9f707 R09: 00000000000000a0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000001
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc90001941000, ffffc90001c42000) created by:
 drm_gem_shmem_vmap+0x3ac/0x630 drivers/gpu/drm/drm_gem_shmem_helper.c:343

Memory state around the buggy address:
 ffffc90001c40f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90001c40f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90001c41000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                   ^
 ffffc90001c41080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc90001c41100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================

Crashes (3869):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/05 01:05 upstream c7fb1692dc01 dfbe2ed4 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/04 12:10 upstream ec299e4dc21e d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/04 09:02 upstream ec299e4dc21e d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/03 11:51 upstream e6b9dce0aeeb 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/03 10:12 upstream e6b9dce0aeeb 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/03 07:17 upstream e6b9dce0aeeb 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/02 17:07 upstream b320789d6883 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/02 07:58 upstream b320789d6883 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/01 16:57 upstream b320789d6883 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/01 08:08 upstream b320789d6883 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: vmalloc-out-of-bounds Write in imageblit
2025/08/31 22:39 upstream 5c3b3264e585 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: vmalloc-out-of-bounds Write in imageblit
2025/08/31 15:40 upstream c8bc81a52d5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: vmalloc-out-of-bounds Write in imageblit
2025/07/13 16:48 upstream 3f31a806a62e 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/04 16:44 upstream 08b06c30a445 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/04 14:32 upstream b9a10f876409 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/04 07:56 upstream b9a10f876409 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/04 02:05 upstream ec299e4dc21e 19216959 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/03 21:11 upstream ec299e4dc21e 19216959 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/03 18:07 upstream e6b9dce0aeeb 19216959 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/03 14:50 upstream e6b9dce0aeeb 19216959 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/03 03:54 upstream e6b9dce0aeeb 96a211bc .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/03 02:39 upstream e6b9dce0aeeb 96a211bc .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/03 00:41 upstream e6b9dce0aeeb 96a211bc .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/02 23:09 upstream e6b9dce0aeeb 96a211bc .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/02 18:51 upstream b320789d6883 96a211bc .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/02 15:52 upstream b320789d6883 96a211bc .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/02 09:19 upstream b320789d6883 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/02 06:17 upstream b320789d6883 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/02 04:40 upstream b320789d6883 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/02 03:33 upstream b320789d6883 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/02 02:21 upstream b320789d6883 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/01 22:38 upstream b320789d6883 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/01 20:59 upstream b320789d6883 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/01 17:59 upstream b320789d6883 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/01 12:12 upstream b320789d6883 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/01 09:30 upstream b320789d6883 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/01 01:15 upstream 5c3b3264e585 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/01 00:15 upstream 5c3b3264e585 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/08/31 18:56 upstream 5c3b3264e585 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/08/31 17:51 upstream 5c3b3264e585 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: vmalloc-out-of-bounds Write in imageblit
2025/08/04 12:07 upstream d2eedaa3909b abdcb213 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: vmalloc-out-of-bounds Write in imageblit
2024/08/17 05:01 upstream 670c12ce09a8 e1c76ab2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/04 15:44 upstream b9a10f876409 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/04 14:26 upstream b9a10f876409 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/04 13:25 upstream b9a10f876409 d291dd2d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/03 22:13 upstream ec299e4dc21e 19216959 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/03 05:30 upstream e6b9dce0aeeb 96a211bc .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/02 20:43 upstream b320789d6883 96a211bc .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/01 03:05 upstream 5c3b3264e585 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: vmalloc-out-of-bounds Write in imageblit
2025/08/31 16:40 upstream c8bc81a52d5a 807a3b61 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: vmalloc-out-of-bounds Write in imageblit
2025/09/01 15:27 upstream b320789d6883 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto BUG: unable to handle kernel paging request in imageblit
2025/08/26 19:53 upstream fab1beda7597 e12e5ba4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: stack-out-of-bounds Write in imageblit
2025/08/29 17:54 upstream fb679c832b64 3e1beec6 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: vmalloc-out-of-bounds Read in imageblit
* Struck through repros no longer work on HEAD.