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Message-ID: <Line.LNX.4.64.0706281140530.13114@localhost.localdomain>
Date: Thu, 28 Jun 2007 11:41:38 -0400 (EDT)
From: James Morris <jmorris@...ei.org>
To: Andrew Morton <akpm@...ux-foundation.org>
cc: Stephen Smalley <sds@...ho.nsa.gov>,
Eric Paris <eparis@...hat.com>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] security: move mmap_min_addr sysctl to /proc/sys/vm
Move mmap_min_addr sysctl to /proc/sys/vm, as suggested by Andrew Morton.
Signed-off-by: James Morris <jmorris@...ei.org>
---
Documentation/sysctl/kernel.txt | 14 --------------
Documentation/sysctl/vm.txt | 15 +++++++++++++++
kernel/sysctl.c | 20 ++++++++++----------
3 files changed, 25 insertions(+), 24 deletions(-)
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 1a9dc8a..111fd28 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -29,7 +29,6 @@ show up in /proc/sys/kernel:
- java-interpreter [ binfmt_java, obsolete ]
- kstack_depth_to_print [ X86 only ]
- l2cr [ PPC only ]
-- mmap_min_addr
- modprobe ==> Documentation/kmod.txt
- msgmax
- msgmnb
@@ -179,19 +178,6 @@ kernel stack.
==============================================================
-mmap_min_addr
-
-This file indicates the amount of address space which a user process will be
-restricted from mmaping. Since kernel null dereference bugs could
-accidentally operate based on the information in the first couple of pages of
-memory userspace processes should not be allowed to write to them. By default
-this value is set to 0 and no protections will be enforced by the security
-module. Setting this value to something like 64k will allow the vast majority
-of applications to work correctly and provide defense in depth against future
-potential kernel bugs.
-
-==============================================================
-
osrelease, ostype & version:
# cat osrelease
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 1d19256..8cfca17 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -31,6 +31,7 @@ Currently, these files are in /proc/sys/vm:
- min_unmapped_ratio
- min_slab_ratio
- panic_on_oom
+- mmap_min_address
==============================================================
@@ -216,3 +217,17 @@ above-mentioned.
The default value is 0.
1 and 2 are for failover of clustering. Please select either
according to your policy of failover.
+
+==============================================================
+
+mmap_min_addr
+
+This file indicates the amount of address space which a user process will
+be restricted from mmaping. Since kernel null dereference bugs could
+accidentally operate based on the information in the first couple of pages
+of memory userspace processes should not be allowed to write to them. By
+default this value is set to 0 and no protections will be enforced by the
+security module. Setting this value to something like 64k will allow the
+vast majority of applications to work correctly and provide defense in depth
+against future potential kernel bugs.
+
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 8f9a737..44f0a50 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -615,16 +615,6 @@ static ctl_table kern_table[] = {
.proc_handler = &proc_dointvec,
},
#endif
-#ifdef CONFIG_SECURITY
- {
- .ctl_name = CTL_UNNUMBERED,
- .procname = "mmap_min_addr",
- .data = &mmap_min_addr,
- .maxlen = sizeof(unsigned long),
- .mode = 0644,
- .proc_handler = &proc_doulongvec_minmax,
- },
-#endif
{ .ctl_name = 0 }
};
@@ -878,6 +868,16 @@ static ctl_table vm_table[] = {
.strategy = &sysctl_jiffies,
},
#endif
+#ifdef CONFIG_SECURITY
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "mmap_min_addr",
+ .data = &mmap_min_addr,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = &proc_doulongvec_minmax,
+ },
+#endif
#if defined(CONFIG_X86_32) || \
(defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
{
--
1.5.0.6
-
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