linux-kernel - [PATCH 1/1] x86: fix exec mappings comments

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Date:	Sat, 12 Apr 2008 10:28:25 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Ingo Molnar <mingo@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Jiri Slaby <jirislaby@...il.com>
Subject: [PATCH 1/1] x86: fix exec mappings comments

- noexec32 is on by default for years already
- add noexec32 to kernel-parameters and fix noexec type in there

Signed-off-by: Jiri Slaby <jirislaby@...il.com>
---
 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 a52524c..b0f7c13 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1285,8 +1285,16 @@ 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 9042fb0..aee0e82 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)
 {
-- 
1.5.4.5

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