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Mon, 24 Feb 2020 00:18:13 -0800 (PST) Date: Mon, 24 Feb 2020 00:18:13 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000387920059f4e0351@google.com> Subject: KMSAN: kernel-infoleak in tty_compat_ioctl From: syzbot To: glider@google.com, gregkh@linuxfoundation.org, jslaby@suse.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 8bbbc5cf kmsan: don't compile memmove git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=1280ea7ee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=cd0e9a6b0e555cc3 dashboard link: https://syzkaller.appspot.com/bug?extid=8da9175e28eadcb203ce compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1722a3d9e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1071e265e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+8da9175e28eadcb203ce@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0x81/0x90 mm/kmsan/kmsan_hooks.c:253 CPU: 1 PID: 11476 Comm: syz-executor814 Not tainted 5.6.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x220 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 kmsan_internal_check_memory+0x238/0x3d0 mm/kmsan/kmsan.c:423 kmsan_copy_to_user+0x81/0x90 mm/kmsan/kmsan_hooks.c:253 _copy_to_user+0x15a/0x1f0 lib/usercopy.c:33 copy_to_user include/linux/uaccess.h:174 [inline] compat_tty_tiocgserial drivers/tty/tty_io.c:2748 [inline] tty_compat_ioctl+0x1482/0x1850 drivers/tty/tty_io.c:2846 __do_compat_sys_ioctl fs/ioctl.c:857 [inline] __se_compat_sys_ioctl+0x57c/0xed0 fs/ioctl.c:808 __ia32_compat_sys_ioctl+0xd9/0x110 fs/ioctl.c:808 do_syscall_32_irqs_on arch/x86/entry/common.c:339 [inline] do_fast_syscall_32+0x3c7/0x6e0 arch/x86/entry/common.c:410 entry_SYSENTER_compat+0x68/0x77 arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7ff7d99 Code: 90 e8 0b 00 00 00 f3 90 0f ae e8 eb f9 8d 74 26 00 89 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000ff97b20c EFLAGS: 00000213 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000000541e RDX: 0000000020000300 RSI: 00000000080ea078 RDI: 00000000ff97b260 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Local variable ----v32.i105@tty_compat_ioctl created at: compat_tty_tiocgserial drivers/tty/tty_io.c:2735 [inline] tty_compat_ioctl+0xf12/0x1850 drivers/tty/tty_io.c:2846 compat_tty_tiocgserial drivers/tty/tty_io.c:2735 [inline] tty_compat_ioctl+0xf12/0x1850 drivers/tty/tty_io.c:2846 Bytes 50-51 of 60 are uninitialized Memory access of size 60 starts at ffffb50b0158fce0 Data copied to user address 0000000020000300 ===================================================== --- This bug 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@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches