================================================================== BUG: KFENCE: out-of-bounds read in memcpy_orig+0xc5/0x130 arch/x86/lib/memcpy_64.S:132 Out-of-bounds read at 0xffff88823bfbff78 (136B left of kfence-#223): memcpy_orig+0xc5/0x130 arch/x86/lib/memcpy_64.S:132 scr_memcpyw include/linux/vt_buffer.h:38 [inline] fbcon_prepare_logo+0xa03/0xc70 drivers/video/fbdev/core/fbcon.c:623 fbcon_init+0xd77/0x1900 drivers/video/fbdev/core/fbcon.c:1156 visual_init+0x320/0x620 drivers/tty/vt/vt.c:1020 do_bind_con_driver.isra.0+0x57a/0xbf0 drivers/tty/vt/vt.c:3960 vt_bind drivers/tty/vt/vt.c:4116 [inline] store_bind+0x61d/0x760 drivers/tty/vt/vt.c:4188 dev_attr_store+0x58/0x80 drivers/base/core.c:2437 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142 kernfs_fop_write_iter+0x3af/0x570 fs/kernfs/file.c:352 iter_file_splice_write+0xa24/0x12e0 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x192/0x6c0 fs/splice.c:1161 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x174/0x240 fs/splice.c:1230 do_sendfile+0xb06/0xe50 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64 fs/read_write.c:1417 [inline] __x64_sys_sendfile64+0x1d8/0x220 fs/read_write.c:1417 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f kfence-#223: 0xffff88823bfc0000-0xffff88823bfc002f, size=48, cache=kmalloc-64 allocated by task 11941 on cpu 0 at 406.862115s (0.038252s ago): kmalloc_noprof include/linux/slab.h:961 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] vc_do_resize+0x1de/0x10e0 drivers/tty/vt/vt.c:1183 vc_resize include/linux/vt_kern.h:49 [inline] fbcon_init+0xd53/0x1900 drivers/video/fbdev/core/fbcon.c:1153 visual_init+0x320/0x620 drivers/tty/vt/vt.c:1020 do_bind_con_driver.isra.0+0x57a/0xbf0 drivers/tty/vt/vt.c:3960 vt_bind drivers/tty/vt/vt.c:4116 [inline] store_bind+0x61d/0x760 drivers/tty/vt/vt.c:4188 dev_attr_store+0x58/0x80 drivers/base/core.c:2437 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142 kernfs_fop_write_iter+0x3af/0x570 fs/kernfs/file.c:352 iter_file_splice_write+0xa24/0x12e0 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x192/0x6c0 fs/splice.c:1161 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x174/0x240 fs/splice.c:1230 do_sendfile+0xb06/0xe50 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64 fs/read_write.c:1417 [inline] __x64_sys_sendfile64+0x1d8/0x220 fs/read_write.c:1417 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 11941 Comm: syz.9.1052 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:memcpy_orig+0xc5/0x130 arch/x86/lib/memcpy_64.S:136 Code: 16 f8 4c 89 07 4c 89 4f 08 4c 89 54 17 f0 4c 89 5c 17 f8 e9 3d e4 02 00 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 fa 08 72 1b <4c> 8b 06 4c 8b 4c 16 f8 4c 89 07 4c 89 4c 17 f8 e9 16 e4 02 00 66 RSP: 0018:ffffc900047275f0 EFLAGS: 00010246 RAX: ffff88823bfbff78 RBX: ffff88813fe09000 RCX: ffffffff84f505e3 RDX: 0000000000000008 RSI: ffff88823bfbff78 RDI: ffff88823bfbff78 RBP: ffff88823bfbfed8 R08: 0000000000000001 R09: ffffed10477f7fef R10: ffff88823bfbff7f R11: 0000000000000001 R12: ffffffffffffff60 R13: 0000000000000002 R14: ffffed1027fc1279 R15: 0000000000000004 FS: 00007f74321686c0(0000) GS:ffff8881249e1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823bfbff78 CR3: 00000000430da000 CR4: 00000000003526f0 Call Trace: scr_memcpyw include/linux/vt_buffer.h:38 [inline] fbcon_prepare_logo+0xa03/0xc70 drivers/video/fbdev/core/fbcon.c:623 fbcon_init+0xd77/0x1900 drivers/video/fbdev/core/fbcon.c:1156 visual_init+0x320/0x620 drivers/tty/vt/vt.c:1020 do_bind_con_driver.isra.0+0x57a/0xbf0 drivers/tty/vt/vt.c:3960 vt_bind drivers/tty/vt/vt.c:4116 [inline] store_bind+0x61d/0x760 drivers/tty/vt/vt.c:4188 dev_attr_store+0x58/0x80 drivers/base/core.c:2437 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:142 kernfs_fop_write_iter+0x3af/0x570 fs/kernfs/file.c:352 iter_file_splice_write+0xa24/0x12e0 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x192/0x6c0 fs/splice.c:1161 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x174/0x240 fs/splice.c:1230 do_sendfile+0xb06/0xe50 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64 fs/read_write.c:1417 [inline] __x64_sys_sendfile64+0x1d8/0x220 fs/read_write.c:1417 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f743138efc9 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:00007f7432168038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f74315e5fa0 RCX: 00007f743138efc9 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000003 RBP: 00007f7431411f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f74315e6038 R14: 00007f74315e5fa0 R15: 00007ffe68af6bc8 ================================================================== ---------------- Code disassembly (best guess), 1 bytes skipped: 0: f8 clc 1: 4c 89 07 mov %r8,(%rdi) 4: 4c 89 4f 08 mov %r9,0x8(%rdi) 8: 4c 89 54 17 f0 mov %r10,-0x10(%rdi,%rdx,1) d: 4c 89 5c 17 f8 mov %r11,-0x8(%rdi,%rdx,1) 12: e9 3d e4 02 00 jmp 0x2e454 17: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 1e: 00 00 00 00 22: 66 90 xchg %ax,%ax 24: 83 fa 08 cmp $0x8,%edx 27: 72 1b jb 0x44 * 29: 4c 8b 06 mov (%rsi),%r8 <-- trapping instruction 2c: 4c 8b 4c 16 f8 mov -0x8(%rsi,%rdx,1),%r9 31: 4c 89 07 mov %r8,(%rdi) 34: 4c 89 4c 17 f8 mov %r9,-0x8(%rdi,%rdx,1) 39: e9 16 e4 02 00 jmp 0x2e454 3e: 66 data16