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Date: Mon, 29 Jan 2018 17:02:44 -0800
From: Dan Williams <dan.j.williams@...el.com>
To: tglx@...utronix.de, mingo@...nel.org
Cc: linux-arch@...r.kernel.org, Tom Lendacky <thomas.lendacky@....com>,
Kees Cook <keescook@...omium.org>, kernel-hardening@...ts.openwall.com,
gregkh@...uxfoundation.org, x86@...nel.org, linux-kernel@...r.kernel.org,
Ingo Molnar <mingo@...hat.com>, Al Viro <viro@...iv.linux.org.uk>,
"H. Peter Anvin" <hpa@...or.com>, torvalds@...ux-foundation.org,
alan@...ux.intel.com
Subject: [PATCH v6 06/13] x86,
usercopy: replace open coded stac/clac with __uaccess_{begin, end}
In preparation for converting some __uaccess_begin() instances to
__uacess_begin_nospec(), make sure all 'from user' uaccess paths are
using the _begin(), _end() helpers rather than open-coded stac() and
clac().
There are no functional changes in this patch.
Suggested-by: Ingo Molnar <mingo@...hat.com>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Kees Cook <keescook@...omium.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
arch/x86/lib/usercopy_32.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/x86/lib/usercopy_32.c b/arch/x86/lib/usercopy_32.c
index 1b377f734e64..de3436719e26 100644
--- a/arch/x86/lib/usercopy_32.c
+++ b/arch/x86/lib/usercopy_32.c
@@ -331,12 +331,12 @@ do { \
unsigned long __copy_user_ll(void *to, const void *from, unsigned long n)
{
- stac();
+ __uaccess_begin();
if (movsl_is_ok(to, from, n))
__copy_user(to, from, n);
else
n = __copy_user_intel(to, from, n);
- clac();
+ __uaccess_end();
return n;
}
EXPORT_SYMBOL(__copy_user_ll);
@@ -344,7 +344,7 @@ EXPORT_SYMBOL(__copy_user_ll);
unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from,
unsigned long n)
{
- stac();
+ __uaccess_begin();
#ifdef CONFIG_X86_INTEL_USERCOPY
if (n > 64 && static_cpu_has(X86_FEATURE_XMM2))
n = __copy_user_intel_nocache(to, from, n);
@@ -353,7 +353,7 @@ unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *fr
#else
__copy_user(to, from, n);
#endif
- clac();
+ __uaccess_end();
return n;
}
EXPORT_SYMBOL(__copy_from_user_ll_nocache_nozero);
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