linux-kernel - [PATCH 3.16 176/202] x86/uaccess: Don't leak the AC flag into __put

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Message-ID: <lsq.1556377989.622339469@decadent.org.uk>
Date:   Sat, 27 Apr 2019 16:13:09 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Denys Vlasenko" <dvlasenk@...hat.com>,
        "Josh Poimboeuf" <jpoimboe@...hat.com>,
        "Brian Gerst" <brgerst@...il.com>,
        "Andy Lutomirski" <luto@...nel.org>,
        "Borislav Petkov" <bp@...e.de>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: [PATCH 3.16 176/202] x86/uaccess: Don't leak the AC flag into
 __put_user() value evaluation

3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Andy Lutomirski <luto@...nel.org>

commit 2a418cf3f5f1caf911af288e978d61c9844b0695 upstream.

When calling __put_user(foo(), ptr), the __put_user() macro would call
foo() in between __uaccess_begin() and __uaccess_end().  If that code
were buggy, then those bugs would be run without SMAP protection.

Fortunately, there seem to be few instances of the problem in the
kernel. Nevertheless, __put_user() should be fixed to avoid doing this.
Therefore, evaluate __put_user()'s argument before setting AC.

This issue was noticed when an objtool hack by Peter Zijlstra complained
about genregs_get() and I compared the assembly output to the C source.

 [ bp: Massage commit message and fixed up whitespace. ]

Fixes: 11f1a4b9755f ("x86: reorganize SMAP handling in user space accesses")
Signed-off-by: Andy Lutomirski <luto@...nel.org>
Signed-off-by: Borislav Petkov <bp@...e.de>
Acked-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Link: http://lkml.kernel.org/r/20190225125231.845656645@infradead.org
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -311,8 +311,7 @@ do {									\
 		__put_user_asm(x, ptr, retval, "l", "k", "ir", errret);	\
 		break;							\
 	case 8:								\
-		__put_user_asm_u64((__typeof__(*ptr))(x), ptr, retval,	\
-				   errret);				\
+		__put_user_asm_u64(x, ptr, retval, errret);		\
 		break;							\
 	default:							\
 		__put_user_bad();					\
@@ -423,8 +422,10 @@ do {									\
 #define __put_user_nocheck(x, ptr, size)			\
 ({								\
 	int __pu_err;						\
+	__typeof__(*(ptr)) __pu_val;				\
+	__pu_val = x;						\
 	__uaccess_begin();					\
-	__put_user_size((x), (ptr), (size), __pu_err, -EFAULT);	\
+	__put_user_size(__pu_val, (ptr), (size), __pu_err, -EFAULT); \
 	__uaccess_end();					\
 	__pu_err;						\
 })