In container environment, we don't want users to bind their memory to a
specific numa node, while we want to unit control memory resource with
kubelet. Therefore, add a new lsm hook for set_mempolicy_home_node(2), then
we can enforce fine-grained control over memory policy adjustment by the
tasks in a container.
Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
---
include/linux/lsm_hook_defs.h | 2 ++
include/linux/security.h | 8 ++++++++
mm/mempolicy.c | 5 +++++
security/security.c | 7 +++++++
4 files changed, 22 insertions(+)
diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index 725a03d..109883e 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -425,3 +425,5 @@
unsigned long maxnode, unsigned int flags)
LSM_HOOK(int, 0, set_mempolicy, int mode, const unsigned long __user *nmask,
unsigned long maxnode)
+LSM_HOOK(int, 0, set_mempolicy_home_node, unsigned long start, unsigned long len,
+ unsigned long home_node, unsigned long flags)
diff --git a/include/linux/security.h b/include/linux/security.h
index 93c91b6a..7b7096f 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -489,6 +489,8 @@ int security_mbind(unsigned long start, unsigned long len,
unsigned long maxnode, unsigned int flags);
int security_set_mempolicy(int mode, const unsigned long __user *nmask,
unsigned long maxnode);
+int security_set_mempolicy_home_node(unsigned long start, unsigned long len,
+ unsigned long home_node, unsigned long flags);
#else /* CONFIG_SECURITY */
static inline int call_blocking_lsm_notifier(enum lsm_event event, void *data)
@@ -1413,6 +1415,12 @@ static inline int security_set_mempolicy(int mode, const unsigned long __user *n
{
return 0;
}
+
+static inline int security_set_mempolicy_home_node(unsigned long start, unsigned long len,
+ unsigned long home_node, unsigned long flags)
+{
+ return 0;
+}
#endif /* CONFIG_SECURITY */
#if defined(CONFIG_SECURITY) && defined(CONFIG_WATCH_QUEUE)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 0a76cd2..54106e1 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1523,6 +1523,11 @@ static long kernel_mbind(unsigned long start, unsigned long len,
return -EINVAL;
if (end == start)
return 0;
+
+ err = security_set_mempolicy_home_node(start, len, home_node, flags);
+ if (err)
+ return err;
+
mmap_write_lock(mm);
prev = vma_prev(&vmi);
for_each_vma_range(vmi, vma, end) {
diff --git a/security/security.c b/security/security.c
index 79ae17d..0a2e062 100644
--- a/security/security.c
+++ b/security/security.c
@@ -5349,3 +5349,10 @@ int security_set_mempolicy(int mode, const unsigned long __user *nmask, unsigned
{
return call_int_hook(set_mempolicy, 0, mode, nmask, maxnode);
}
+
+int security_set_mempolicy_home_node(unsigned long start, unsigned long len,
+ unsigned long home_node, unsigned long flags)
+{
+
+ return call_int_hook(set_mempolicy_home_node, 0, start, len, home_node, flags);
+}
--
1.8.3.1
