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KASAN: slab-out-of-bounds Read in fbcon_prepare_logo

Status: upstream: reported C repro on 2025/02/25 07:06
Subsystems: fbdev
[Documentation on labels]
Reported-by: syzbot+0c815b25cdb3678e7083@syzkaller.appspotmail.com
First crash: 376d, last: 6h22m
▶ ▼ Discussions (12)
Title Replies (including bot) Last reply
[syzbot] Monthly fbdev report (Feb 2026) 0 (1) 2026/02/16 07:33
[syzbot] Monthly fbdev report (Jan 2026) 0 (1) 2026/01/15 13:09
[syzbot] Monthly fbdev report (Dec 2025) 0 (1) 2025/12/16 01:32
[syzbot] Monthly fbdev report (Nov 2025) 0 (1) 2025/11/14 18:41
[syzbot] Monthly fbdev report (Sep 2025) 0 (1) 2025/09/12 21:33
[syzbot] Monthly fbdev report (Aug 2025) 0 (1) 2025/08/12 12:44
[syzbot] [fbdev?] KASAN: slab-out-of-bounds Read in fbcon_prepare_logo 0 (5) 2025/08/04 13:47
[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
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2025/08/04 13:47 14m sravankumarlpu@gmail.com https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4b290aae788e06561754b28c6842e4080957d3f7 report log
2025/08/03 22:24 14m sravankumarlpu@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4b290aae788e06561754b28c6842e4080957d3f7 report log

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:38 [inline]
BUG: KASAN: slab-out-of-bounds in fbcon_prepare_logo+0xa03/0xc70 drivers/video/fbdev/core/fbcon.c:618
Read of size 256 at addr ffff8880331da860 by task syz.0.17/5996

CPU: 0 UID: 0 PID: 5996 Comm: syz.0.17 Not tainted 6.16.0-syzkaller-04405-g4b290aae788e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:189
 __asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105
 scr_memcpyw include/linux/vt_buffer.h:38 [inline]
 fbcon_prepare_logo+0xa03/0xc70 drivers/video/fbdev/core/fbcon.c:618
 fbcon_init+0xd77/0x1900 drivers/video/fbdev/core/fbcon.c:1150
 visual_init+0x31d/0x620 drivers/tty/vt/vt.c:1019
 do_bind_con_driver.isra.0+0x57a/0xbf0 drivers/tty/vt/vt.c:3915
 vt_bind drivers/tty/vt/vt.c:4071 [inline]
 store_bind+0x61d/0x760 drivers/tty/vt/vt.c:4143
 dev_attr_store+0x55/0x80 drivers/base/core.c:2437
 sysfs_kf_write+0xef/0x150 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x354/0x510 fs/kernfs/file.c:334
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x6c4/0x1150 fs/read_write.c:686
 ksys_write+0x12a/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f580578e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffce73cfbb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f58059b5fa0 RCX: 00007f580578e9a9
RDX: 0000000000000081 RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007f5805810d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f58059b5fa0 R14: 00007f58059b5fa0 R15: 0000000000000003
 </TASK>

The buggy address belongs to the object at ffff8880331da000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 96 bytes to the right of
 allocated 2048-byte region [ffff8880331da000, ffff8880331da800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x331d8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b842000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b842000 dead000000000122 0000000000000000
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000cc7601 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5996, tgid 5996 (syz.0.17), ts 103546222970, free_ts 103072976762
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
 alloc_slab_page mm/slub.c:2451 [inline]
 allocate_slab mm/slub.c:2619 [inline]
 new_slab+0x23b/0x330 mm/slub.c:2673
 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3859
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3949
 __slab_alloc_node mm/slub.c:4024 [inline]
 slab_alloc_node mm/slub.c:4185 [inline]
 __do_kmalloc_node mm/slub.c:4327 [inline]
 __kmalloc_noprof+0x2f2/0x510 mm/slub.c:4340
 kmalloc_noprof include/linux/slab.h:909 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 vc_do_resize+0x1de/0x10e0 drivers/tty/vt/vt.c:1182
 vc_resize include/linux/vt_kern.h:49 [inline]
 fbcon_startup+0x427/0xba0 drivers/video/fbdev/core/fbcon.c:1001
 do_bind_con_driver.isra.0+0x20a/0xbf0 drivers/tty/vt/vt.c:3878
 vt_bind drivers/tty/vt/vt.c:4071 [inline]
 store_bind+0x61d/0x760 drivers/tty/vt/vt.c:4143
 dev_attr_store+0x55/0x80 drivers/base/core.c:2437
 sysfs_kf_write+0xef/0x150 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x354/0x510 fs/kernfs/file.c:334
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x6c4/0x1150 fs/read_write.c:686
page last free pid 5947 tgid 5947 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1248 [inline]
 __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4148 [inline]
 slab_alloc_node mm/slub.c:4197 [inline]
 __do_kmalloc_node mm/slub.c:4327 [inline]
 __kmalloc_noprof+0x1d4/0x510 mm/slub.c:4340
 kmalloc_noprof include/linux/slab.h:909 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
 ip6_route_info_create+0x14c/0x870 net/ipv6/route.c:3811
 ip6_route_add.part.0+0x22/0x1d0 net/ipv6/route.c:3940
 ip6_route_add+0x45/0x60 net/ipv6/route.c:3937
 addrconf_prefix_route+0x2fd/0x510 net/ipv6/addrconf.c:2487
 inet6_addr_add+0x589/0x960 net/ipv6/addrconf.c:3052
 inet6_rtm_newaddr+0x1619/0x1c70 net/ipv6/addrconf.c:5058
 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6944
 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x58a/0x850 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896

Memory state around the buggy address:
 ffff8880331da700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880331da780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880331da800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                       ^
 ffff8880331da880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880331da900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (1411):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/30 20:33 upstream 4b290aae788e f8f2b4da .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2025/04/20 09:17 upstream 119009db2674 2a20f901 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2025/02/25 11:42 upstream d082ecbc71e9 d34966d1 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/03/03 11:32 upstream af4e9ef3d784 28b83e23 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/03/03 02:13 upstream af4e9ef3d784 28b83e23 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/03/02 13:20 upstream 11439c4635ed b9dd6534 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/03/02 09:40 upstream 39c633261414 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/03/02 01:29 upstream 39c633261414 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/03/02 00:04 upstream 39c633261414 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/03/01 06:57 upstream 2f9339c052bd 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/03/01 04:51 upstream 2f9339c052bd 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/03/01 03:39 upstream 2f9339c052bd 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/03/01 02:13 upstream 2f9339c052bd 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/28 17:21 upstream 4d349ee5c778 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/28 10:08 upstream 4d349ee5c778 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/28 09:02 upstream 4d349ee5c778 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/28 04:40 upstream 4d349ee5c778 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/28 01:22 upstream a75cb869a8cc 2cf092b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/27 21:03 upstream a75cb869a8cc 2cf092b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/27 19:02 upstream a75cb869a8cc 2cf092b8 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/27 11:33 upstream 3f4a08e64442 a2f13f71 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/26 17:27 upstream f4d0ec0aa20d ffa54287 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/26 06:49 upstream d9d32e5bd5a4 e0f78d93 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/26 03:00 upstream d9d32e5bd5a4 e0f78d93 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/25 21:08 upstream d9d32e5bd5a4 c162cde9 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/25 16:45 upstream 7dff99b35460 c162cde9 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/25 09:34 upstream 7dff99b35460 787dfb7c .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/24 16:15 upstream 7dff99b35460 96b1aa46 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/24 12:36 upstream 7dff99b35460 96b1aa46 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/24 08:52 upstream 7dff99b35460 41d2fa6a .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/23 01:50 upstream 189f164e573e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/22 20:32 upstream 189f164e573e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/22 17:38 upstream 32a92f8c8932 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/22 12:47 upstream 32a92f8c8932 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/22 00:22 upstream d79526b89571 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/02/21 16:08 upstream a95f71ad3e2e 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2025/02/25 07:05 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2025/02/24 02:38 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2025/02/20 08:53 upstream 87a132e73910 50668798 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-out-of-bounds Read in fbcon_prepare_logo
2026/03/03 14:59 upstream af4e9ef3d784 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: use-after-free Read in fbcon_prepare_logo
2026/03/02 18:32 upstream 11439c4635ed b9dd6534 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: use-after-free Read in fbcon_prepare_logo
2026/03/02 06:36 upstream 39c633261414 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: use-after-free Read in fbcon_prepare_logo
2026/03/01 16:34 upstream eb71ab2bf722 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-use-after-free Read in fbcon_prepare_logo
2026/02/28 23:34 upstream 2f9339c052bd 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: use-after-free Read in fbcon_prepare_logo
2026/02/28 12:23 upstream 4d349ee5c778 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: use-after-free Read in fbcon_prepare_logo
2026/02/25 19:09 upstream 7dff99b35460 c162cde9 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: use-after-free Read in fbcon_prepare_logo
2026/02/25 18:16 upstream 7dff99b35460 c162cde9 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-use-after-free Read in fbcon_prepare_logo
2026/02/23 15:38 upstream 6de23f81a5e0 7c9658af .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: use-after-free Read in fbcon_prepare_logo
2026/02/22 15:34 upstream 32a92f8c8932 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: use-after-free Read in fbcon_prepare_logo
2026/02/21 22:07 upstream d79526b89571 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KASAN: slab-use-after-free Read in fbcon_prepare_logo
2026/02/06 13:10 upstream b7ff7151e653 97745f52 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KFENCE: use-after-free read in fbcon_prepare_logo
2025/10/19 08:50 upstream 1c64efcb083c 1c8c8cd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto KFENCE: out-of-bounds read in fbcon_prepare_logo
* Struck through repros no longer work on HEAD.