================================================================== 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+0xa15/0xc80 drivers/video/fbdev/core/fbcon.c:614 Read of size 14 at addr ffff8880345f663e by task syz.0.1494/11676 CPU: 1 UID: 0 PID: 11676 Comm: syz.0.1494 Tainted: G U 6.14.0-rc4-syzkaller #0 Tainted: [U]=USER Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __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:408 [inline] print_report+0xc3/0x670 mm/kasan/report.c:521 kasan_report+0xd9/0x110 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 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+0xa15/0xc80 drivers/video/fbdev/core/fbcon.c:614 fbcon_init+0xd41/0x1890 drivers/video/fbdev/core/fbcon.c:1146 visual_init+0x31d/0x620 drivers/tty/vt/vt.c:1011 do_bind_con_driver.isra.0+0x57a/0xbf0 drivers/tty/vt/vt.c:3831 vt_bind drivers/tty/vt/vt.c:3987 [inline] store_bind+0x61d/0x760 drivers/tty/vt/vt.c:4059 dev_attr_store+0x55/0x80 drivers/base/core.c:2439 sysfs_kf_write+0x117/0x170 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x33d/0x500 fs/kernfs/file.c:334 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x12b/0x250 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffbe058d169 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:00007ffbe1384038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffbe07a5fa0 RCX: 00007ffbe058d169 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007ffbe060e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffbe07a5fa0 R15: 00007ffd1c6e7768 Allocated by task 6433: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4294 [inline] __kmalloc_noprof+0x21c/0x510 mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] ima_alloc_init_template+0xb8/0x720 security/integrity/ima/ima_api.c:50 ima_store_measurement+0x1ea/0x5c0 security/integrity/ima/ima_api.c:376 process_measurement+0x1bcb/0x2370 security/integrity/ima/ima_main.c:380 ima_bprm_check+0xe8/0x210 security/integrity/ima/ima_main.c:547 security_bprm_check+0xa5/0x1e0 security/security.c:1302 search_binary_handler fs/exec.c:1765 [inline] exec_binprm fs/exec.c:1807 [inline] bprm_execve fs/exec.c:1859 [inline] bprm_execve+0x832/0x16d0 fs/exec.c:1835 do_execveat_common.isra.0+0x4a2/0x610 fs/exec.c:1966 do_execve fs/exec.c:2040 [inline] __do_sys_execve fs/exec.c:2116 [inline] __se_sys_execve fs/exec.c:2111 [inline] __x64_sys_execve+0x8c/0xb0 fs/exec.c:2111 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880345f6600 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 62 bytes inside of allocated 64-byte region [ffff8880345f6600, ffff8880345f6640) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x345f6 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b0418c0 ffffea0000c94840 dead000000000004 raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 20094292644, free_ts 20085651238 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x221/0x2470 mm/page_alloc.c:4739 alloc_pages_mpol+0x1fc/0x540 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2587 [inline] new_slab+0x23d/0x330 mm/slub.c:2640 ___slab_alloc+0xc5d/0x1720 mm/slub.c:3826 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __do_kmalloc_node mm/slub.c:4293 [inline] __kmalloc_node_noprof+0x2f0/0x510 mm/slub.c:4300 kmalloc_node_noprof include/linux/slab.h:928 [inline] __vmalloc_area_node mm/vmalloc.c:3647 [inline] __vmalloc_node_range_noprof+0x3d8/0x1530 mm/vmalloc.c:3846 __vmalloc_node_noprof mm/vmalloc.c:3911 [inline] vzalloc_noprof+0x6b/0x90 mm/vmalloc.c:3984 bpf_check+0x1c2/0xb330 kernel/bpf/verifier.c:23062 bpf_prog_load+0xe3c/0x2480 kernel/bpf/syscall.c:2952 __sys_bpf+0x4043/0x49c0 kernel/bpf/syscall.c:5795 ____bpf_sys_bpf kernel/bpf/syscall.c:5933 [inline] kern_sys_bpf+0x13e/0x660 kernel/bpf/syscall.c:5981 skel_sys_bpf tools/lib/bpf/skel_internal.h:75 [inline] bpf_load_and_run.constprop.0+0x28c/0x5e0 tools/lib/bpf/skel_internal.h:341 iterators_bpf__load kernel/bpf/preload/iterators/iterators.lskel-little-endian.h:403 [inline] load_skel kernel/bpf/preload/bpf_preload_kern.c:45 [inline] load+0x147/0x5d0 kernel/bpf/preload/bpf_preload_kern.c:78 page last free pid 25 tgid 25 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0x6db/0xfb0 mm/page_alloc.c:2660 vfree+0x174/0x950 mm/vmalloc.c:3383 delayed_vfree_work+0x56/0x70 mm/vmalloc.c:3303 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff8880345f6500: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff8880345f6580: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff8880345f6600: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff8880345f6680: 00 00 00 00 00 00 05 fc fc fc fc fc fc fc fc fc ffff8880345f6700: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ==================================================================