Hello, syzbot found the following issue on: HEAD commit: 3d25a941ea50 Merge tag 'block-6.9-20240503' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1503a62f180000 kernel config: https://syzkaller.appspot.com/x/.config?x=bbf567496022057b dashboard link: https://syzkaller.appspot.com/bug?extid=8d57540d08e2510c9741 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/31394def760d/disk-3d25a941.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b07167755ad1/vmlinux-3d25a941.xz kernel image: https://storage.googleapis.com/syzbot-assets/7cb810157366/bzImage-3d25a941.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8d57540d08e2510c9741@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x110 lib/usercopy.c:40 instrument_copy_to_user include/linux/instrumented.h:114 [inline] _copy_to_user+0xbc/0x110 lib/usercopy.c:40 copy_to_user include/linux/uaccess.h:191 [inline] con_font_get drivers/tty/vt/vt.c:4750 [inline] con_font_op+0x14a2/0x1710 drivers/tty/vt/vt.c:4844 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline] vt_ioctl+0x2b6e/0x2fe0 drivers/tty/vt/vt_ioctl.c:751 tty_ioctl+0xd18/0x1990 drivers/tty/tty_io.c:2803 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890 x64_sys_call+0x1883/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was created at: __kmalloc_large_node+0x231/0x370 mm/slub.c:3921 __do_kmalloc_node mm/slub.c:3954 [inline] __kmalloc_node+0xb07/0x1060 mm/slub.c:3973 kmalloc_node include/linux/slab.h:648 [inline] kvmalloc_node+0xc0/0x2d0 mm/util.c:634 kvmalloc include/linux/slab.h:766 [inline] con_font_get drivers/tty/vt/vt.c:4719 [inline] con_font_op+0x659/0x1710 drivers/tty/vt/vt.c:4844 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline] vt_ioctl+0x2b6e/0x2fe0 drivers/tty/vt/vt_ioctl.c:751 tty_ioctl+0xd18/0x1990 drivers/tty/tty_io.c:2803 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0x261/0x450 fs/ioctl.c:890 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:890 x64_sys_call+0x1883/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Bytes 65536-81919 of 81920 are uninitialized Memory access of size 81920 starts at ffff888073400000 Data copied to user address 00000000200001c0 CPU: 0 PID: 32400 Comm: syz-executor.1 Not tainted 6.9.0-rc6-syzkaller-00227-g3d25a941ea50 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
