git: nanosleep(2): Plug a memory disclourse and be POSIX-compliant

[Aaron LI]

commit 19432bfaa9c3c4915d970c0189a2c852f968651b
Author: Aaron LI <aly at aaronly.me>
Date:   Thu Jan 14 13:06:02 2021 +0800

    nanosleep(2): Plug a memory disclourse and be POSIX-compliant
    
    The nanosleep1() called by sys_nanosleep() would only update rmt on
    EINTR, but it can also return other errors, such as EINVAL.  And in that
    case, sys_nanosleep() would update the user-space rmtp by copying
    garbage from its stack frame.  This is not only a kernel memory
    disclourse, but also not POSIX-compliant.
    
    Fix sys_nanosleep() to update rmtp only on EINTR.  In addition, zero the
    kernel rmt variable for double safety.
    
    Obtained-from: FreeBSD (r315510)
    Reviewd-by: dillon

Summary of changes:
 sys/kern/kern_time.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/19432bfaa9c3c4915d970c0189a2c852f968651b


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