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Security/SELinux: seperate lsm specific mmap_min_addr

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Currently SELinux enforcement of controls on the ability to map low memory
is determined by the mmap_min_addr tunable.  This patch causes SELinux to
ignore the tunable and instead use a seperate Kconfig option specific to how
much space the LSM should protect.

The tunable will now only control the need for CAP_SYS_RAWIO and SELinux
permissions will always protect the amount of low memory designated by
CONFIG_LSM_MMAP_MIN_ADDR.

This allows users who need to disable the mmap_min_addr controls (usual reason
being they run WINE as a non-root user) to do so and still have SELinux
controls preventing confined domains (like a web server) from being able to
map some area of low memory.

Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Eric Paris
2009-07-31 12:54:11 -04:00
committed by James Morris
parent 84336d1a77
commit a2551df7ec
11 changed files with 92 additions and 30 deletions
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2
security/selinux/hooks.c
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@ -3040,7 +3040,7 @@ static int selinux_file_mmap(struct file *file, unsigned long reqprot,
* at bad behaviour/exploit that we always want to get the AVC, even
* if DAC would have also denied the operation.
*/
if (addr < mmap_min_addr) {
if (addr < CONFIG_LSM_MMAP_MIN_ADDR) {
rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
MEMPROTECT__MMAP_ZERO, NULL);
if (rc)