===================================================== BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0x81/0x90 mm/kmsan/kmsan_hooks.c:253 CPU: 0 PID: 15118 Comm: syz-executor.1 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: 0023:0xf7f19d99 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:00000000f5d140cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000000541e RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000000 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 ffffb47402ba7ce0 Data copied to user address 0000000020000000 =====================================================