linux-kernel - [PATCH 89/91] i8k: Avoid lahf in 64-bit code

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 for Android: free password hash cracker in your pocket

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

Date:	Sun, 05 Feb 2012 23:11:18 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Luca Tettamanti <kronos.it@...il.com>,
	Massimo Dal Zotto <dz@...ian.org>,
	Jean Delvare <khali@...ux-fr.org>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: [PATCH 89/91] i8k: Avoid lahf in 64-bit code

2.6.27-longterm review patch.  If anyone has any objections, please let us know.

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

commit bc1f419c76a2d6450413ce4349f4e4a07be011d5 upstream.

i8k uses lahf to read the flag register in 64-bit code; early x86-64
CPUs, however, lack this instruction and we get an invalid opcode
exception at runtime.
Use pushf to load the flag register into the stack instead.

Signed-off-by: Luca Tettamanti <kronos.it@...il.com>
Reported-by: Jeff Rickman <jrickman@...migos.us>
Tested-by: Jeff Rickman <jrickman@...migos.us>
Tested-by: Harry G McGavran Jr <w5pny@...l.net>
Cc: Massimo Dal Zotto <dz@...ian.org>
Signed-off-by: Jean Delvare <khali@...ux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/char/i8k.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

Index: longterm-2.6.27/drivers/char/i8k.c
===================================================================
--- longterm-2.6.27.orig/drivers/char/i8k.c	2012-02-05 22:34:47.136914619 +0100
+++ longterm-2.6.27/drivers/char/i8k.c	2012-02-05 22:34:47.574914836 +0100
@@ -138,8 +138,8 @@
 		"movl %%edi,20(%%rax)\n\t"
 		"popq %%rdx\n\t"
 		"movl %%edx,0(%%rax)\n\t"
-		"lahf\n\t"
-		"shrl $8,%%eax\n\t"
+		"pushfq\n\t"
+		"popq %%rax\n\t"
 		"andl $1,%%eax\n"
 		:"=a"(rc)
 		:    "a"(regs)


--
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/