From f5a1b191b37ac2609e2babeec1b21f411da93e4d Mon Sep 17 00:00:00 2001
From: Jiri Slaby <jirislaby@gmail.com>
Date: Sat, 12 Apr 2008 10:28:25 +0200
Subject: [PATCH] x86: fix exec mappings comments
- noexec32 is on by default for years already
- add noexec32 to kernel-parameters and fix noexec typo in there
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
Documentation/kernel-parameters.txt | 10 +++++++++-
arch/x86/kernel/setup64.c | 4 ++--
2 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4b0f1ae31a4c1..f4839606988be 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1280,8 +1280,16 @@ and is between 256 and 4096 characters. It is defined in the file
noexec [IA-64]
noexec [X86-32,X86-64]
+ On X86-32 available only on PAE configured kernels.
noexec=on: enable non-executable mappings (default)
- noexec=off: disable nn-executable mappings
+ noexec=off: disable non-executable mappings
+
+ noexec32 [X86-64]
+ This affects only 32-bit executables.
+ noexec32=on: enable non-executable mappings (default)
+ read doesn't imply executable mappings
+ noexec32=off: disable non-executable mappings
+ read implies executable mappings
nofxsr [BUGS=X86-32] Disables x86 floating point extended
register save and restore. The kernel will only save
diff --git a/arch/x86/kernel/setup64.c b/arch/x86/kernel/setup64.c
index 9042fb0e36f54..aee0e82007770 100644
--- a/arch/x86/kernel/setup64.c
+++ b/arch/x86/kernel/setup64.c
@@ -74,8 +74,8 @@ int force_personality32 = 0;
Control non executable heap for 32bit processes.
To control the stack too use noexec=off
-on PROT_READ does not imply PROT_EXEC for 32bit processes
-off PROT_READ implies PROT_EXEC (default)
+on PROT_READ does not imply PROT_EXEC for 32bit processes (default)
+off PROT_READ implies PROT_EXEC
*/
static int __init nonx32_setup(char *str)
{
--
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