diff options
| author | Christoph Lameter <cl@linux-foundation.org> | 2009-06-03 16:04:31 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-07-19 20:44:59 -0700 |
| commit | d6055cd3a734696779d238f9e54174954f22c4c9 (patch) | |
| tree | b8b99dae159c10c22dd92a77d3f7ad85d40899a1 /security | |
| parent | 92e7e4cf8ce653e532aa3cb9857df8316a6b2731 (diff) | |
security: use mmap_min_addr indepedently of security models
commit e0a94c2a63f2644826069044649669b5e7ca75d3 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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 559293922a4..38411dddfea 100644 --- a/security/Kconfig +++ b/security/Kconfig @@ -92,28 +92,8 @@ 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 3a4b4f55b33..27a315db6a0 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 */ |