x86/ptrace: fix up botched merge of spectrev1 fix
commit3a647417696217c5861a81ccfe5d2e6791d696ac
authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 4 Sep 2019 10:27:18 +0000 (4 12:27 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 6 Sep 2019 08:21:01 +0000 (6 10:21 +0200)
tree0dc2ea67a3df94575be367d19aa56e45ff58c148
parent2b452eaa9857dae2051fef00cb77fe32ecb560ed
x86/ptrace: fix up botched merge of spectrev1 fix

I incorrectly merged commit 31a2fbb390fe ("x86/ptrace: Fix possible
spectre-v1 in ptrace_get_debugreg()") when backporting it, as was
graciously pointed out at
https://grsecurity.net/teardown_of_a_failed_linux_lts_spectre_fix.php

Resolve the upstream difference with the stable kernel merge to properly
protect things.

Reported-by: Brad Spengler <spender@grsecurity.net>
Cc: Dianzhang Chen <dianzhangchen0@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <bp@alien8.de>
Cc: <hpa@zytor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/kernel/ptrace.c