Davide Libenzi wrote:
This is the core implementation of the new VM_NOZERO page retirement
policy (and the associated MAP_NOZERO).
A new field owner_uid is added the the mm_struct, and it is kept set to
the effective UID of the task that own the mm_struct.
A new field owner_uid is also added to the page struct.
You will also need to take the task's SELinux security
context into account.
SUID programs should not be able to use this feature,
either.
When pages exit (unmapped from) a vma, they are marked with the effective
UID of the mm_struct that owns it.
--- linux-2.6.mod.orig/include/linux/mm_types.h 2007-06-21 14:02:06.000000000 -0700
+++ linux-2.6.mod/include/linux/mm_types.h 2007-06-25 19:11:22.000000000 -0700
@@ -64,6 +64,7 @@
struct list_head lru; /* Pageout list, eg. active_list
* protected by zone->lru_lock !
*/
+ int owner_uid; /* Last owner of the page */
/*
* On machines where all RAM is mapped into kernel address space,
* we can simply calculate the virtual address. On machines with
Since this is only set when the page is freed, could
the owner_uid and security context be put inside a
union with some fields that are not otherwise used
for free pages?
--
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