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authorChristoph Lameter <cl@linux-foundation.org>2009-06-03 16:04:31 -0400
committerJames Morris <jmorris@namei.org>2009-06-04 12:07:48 +1000
commite0a94c2a63f2644826069044649669b5e7ca75d3 (patch)
treedebf8a9af6ac23dadd116dc1cd1f9dcefe9629c6 /mm/mmap.c
parent7d2948b1248109dbc7f4aaf9867c54b1912d494c (diff)
downloadvexpress-lsk-e0a94c2a63f2644826069044649669b5e7ca75d3.tar.gz
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 'mm/mmap.c')
-rw-r--r--mm/mmap.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 6b7b1a95944..2b43fa1aa3c 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -87,6 +87,9 @@ int sysctl_overcommit_ratio = 50; /* default is 50% */
int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;
struct percpu_counter vm_committed_as;
+/* amount of vm to protect from userspace access */
+unsigned long mmap_min_addr = CONFIG_DEFAULT_MMAP_MIN_ADDR;
+
/*
* Check that a process has enough memory to allocate a new virtual
* mapping. 0 means there is enough memory for the allocation to