linux-kernel - [PATCH] x86: do not expose CONFIG

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 28 Jan 2009 13:58:04 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Jaswinder Singh Rajput <jaswinderrajput@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH] x86: do not expose CONFIG_BSWAP to userspace

Use ifdef __i486__ to ensure the BSWAP instruction is available
on 32-bit x86.

Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
HPA,

I'm afraid my knowledge of gcc compiler flags for various models is
lacking, I used i486 as suggested, just wanted to make sure I understood
you corectly.

 arch/x86/include/asm/swab.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/swab.h b/arch/x86/include/asm/swab.h
index 306d417..9af180c 100644
--- a/arch/x86/include/asm/swab.h
+++ b/arch/x86/include/asm/swab.h
@@ -7,7 +7,7 @@
 static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
 {
 #ifdef __i386__
-# ifdef CONFIG_X86_BSWAP
+# ifdef __i486__
 	asm("bswap %0" : "=r" (val) : "0" (val));
 # else
 	asm("xchgb %b0,%h0\n\t"	/* swap lower bytes	*/
@@ -37,7 +37,7 @@ static inline __attribute_const__ __u64 __arch_swab64(__u64 val)
 		__u64 u;
 	} v;
 	v.u = val;
-# ifdef CONFIG_X86_BSWAP
+# ifdef __i486__
 	asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
 	    : "=r" (v.s.a), "=r" (v.s.b)
 	    : "0" (v.s.a), "1" (v.s.b));
-- 
1.6.1.401.gf39d5



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/