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| author | Christoph Lameter <cl@linux-foundation.org> | 2009-06-03 16:04:31 -0400 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2009-06-04 12:07:48 +1000 |
| commit | e0a94c2a63f2644826069044649669b5e7ca75d3 (patch) | |
| tree | debf8a9af6ac23dadd116dc1cd1f9dcefe9629c6 /security | |
| parent | 7d2948b1248109dbc7f4aaf9867c54b1912d494c (diff) | |
| download | linux-e0a94c2a63f2644826069044649669b5e7ca75d3.tar.gz linux-e0a94c2a63f2644826069044649669b5e7ca75d3.tar.bz2 linux-e0a94c2a63f2644826069044649669b5e7ca75d3.zip | |
security: use mmap_min_addr indepedently of security models
This patch removes the dependency of mmap_min_addr on CONFIG_SECURITY.
It also sets a default mmap_min_addr of 4096.
mmapping of addresses below 4096 will only be possible for processes
with CAP_SYS_RAWIO.
Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Acked-by: Eric Paris <eparis@redhat.com>
Looks-ok-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
| -rw-r--r-- | security/Kconfig | 22 | ||||
| -rw-r--r-- | security/security.c | 3 |
2 files changed, 1 insertions, 24 deletions
diff --git a/security/Kconfig b/security/Kconfig index bb244774e9d7..d23c839038f0 100644 --- a/security/Kconfig +++ b/security/Kconfig @@ -110,28 +110,8 @@ config SECURITY_ROOTPLUG See <http://www.linuxjournal.com/article.php?sid=6279> for more information about this module. - - If you are unsure how to answer this question, answer N. - -config SECURITY_DEFAULT_MMAP_MIN_ADDR - int "Low address space to protect from user allocation" - depends on SECURITY - default 0 - help - This is the portion of low virtual memory which should be protected - from userspace allocation. Keeping a user from writing to low pages - can help reduce the impact of kernel NULL pointer bugs. - - For most ia64, ppc64 and x86 users with lots of address space - a value of 65536 is reasonable and should cause no problems. - On arm and other archs it should not be higher than 32768. - Programs which use vm86 functionality would either need additional - permissions from either the LSM or the capabilities module or have - this protection disabled. - - This value can be changed after boot using the - /proc/sys/vm/mmap_min_addr tunable. + If you are unsure how to answer this question, answer N. source security/selinux/Kconfig source security/smack/Kconfig diff --git a/security/security.c b/security/security.c index 5284255c5cdf..dc7674fbfc7a 100644 --- a/security/security.c +++ b/security/security.c @@ -26,9 +26,6 @@ extern void security_fixup_ops(struct security_operations *ops); struct security_operations *security_ops; /* Initialized to NULL */ -/* amount of vm to protect from userspace access */ -unsigned long mmap_min_addr = CONFIG_SECURITY_DEFAULT_MMAP_MIN_ADDR; - static inline int verify(struct security_operations *ops) { /* verify the security_operations structure exists */ |