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-rw-r--r--security/dummy.c6
-rw-r--r--security/security.c2
-rw-r--r--security/selinux/hooks.c12
-rw-r--r--security/selinux/include/av_perm_to_string.h1
-rw-r--r--security/selinux/include/av_permissions.h1
-rw-r--r--security/selinux/include/class_to_string.h1
-rw-r--r--security/selinux/include/flask.h1
7 files changed, 19 insertions, 5 deletions
diff --git a/security/dummy.c b/security/dummy.c
index 8ffd764..d6a112c 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -420,8 +420,12 @@ static int dummy_file_ioctl (struct file *file, unsigned int command,
static int dummy_file_mmap (struct file *file, unsigned long reqprot,
unsigned long prot,
- unsigned long flags)
+ unsigned long flags,
+ unsigned long addr,
+ unsigned long addr_only)
{
+ if (addr < mmap_min_addr)
+ return -EACCES;
return 0;
}
diff --git a/security/security.c b/security/security.c
index fc8601b..024484f 100644
--- a/security/security.c
+++ b/security/security.c
@@ -24,6 +24,7 @@ extern struct security_operations dummy_security_ops;
extern void security_fixup_ops(struct security_operations *ops);
struct security_operations *security_ops; /* Initialized to NULL */
+unsigned long mmap_min_addr; /* 0 means no protection */
static inline int verify(struct security_operations *ops)
{
@@ -176,4 +177,5 @@ EXPORT_SYMBOL_GPL(register_security);
EXPORT_SYMBOL_GPL(unregister_security);
EXPORT_SYMBOL_GPL(mod_reg_security);
EXPORT_SYMBOL_GPL(mod_unreg_security);
+EXPORT_SYMBOL_GPL(mmap_min_addr);
EXPORT_SYMBOL(security_ops);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index b29059e..78c3f98 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2569,12 +2569,16 @@ static int file_map_prot_check(struct file *file, unsigned long prot, int shared
}
static int selinux_file_mmap(struct file *file, unsigned long reqprot,
- unsigned long prot, unsigned long flags)
+ unsigned long prot, unsigned long flags,
+ unsigned long addr, unsigned long addr_only)
{
- int rc;
+ int rc = 0;
+ u32 sid = ((struct task_security_struct*)(current->security))->sid;
- rc = secondary_ops->file_mmap(file, reqprot, prot, flags);
- if (rc)
+ if (addr < mmap_min_addr)
+ rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
+ MEMPROTECT__MMAP_ZERO, NULL);
+ if (rc || addr_only)
return rc;
if (selinux_checkreqprot)
diff --git a/security/selinux/include/av_perm_to_string.h b/security/selinux/include/av_perm_to_string.h
index b83e740..049bf69 100644
--- a/security/selinux/include/av_perm_to_string.h
+++ b/security/selinux/include/av_perm_to_string.h
@@ -158,3 +158,4 @@
S_(SECCLASS_KEY, KEY__CREATE, "create")
S_(SECCLASS_DCCP_SOCKET, DCCP_SOCKET__NODE_BIND, "node_bind")
S_(SECCLASS_DCCP_SOCKET, DCCP_SOCKET__NAME_CONNECT, "name_connect")
+ S_(SECCLASS_MEMPROTECT, MEMPROTECT__MMAP_ZERO, "mmap_zero")
diff --git a/security/selinux/include/av_permissions.h b/security/selinux/include/av_permissions.h
index 5fee173..eda89a2 100644
--- a/security/selinux/include/av_permissions.h
+++ b/security/selinux/include/av_permissions.h
@@ -823,3 +823,4 @@
#define DCCP_SOCKET__NAME_BIND 0x00200000UL
#define DCCP_SOCKET__NODE_BIND 0x00400000UL
#define DCCP_SOCKET__NAME_CONNECT 0x00800000UL
+#define MEMPROTECT__MMAP_ZERO 0x00000001UL
diff --git a/security/selinux/include/class_to_string.h b/security/selinux/include/class_to_string.h
index 3787990..e77de0e 100644
--- a/security/selinux/include/class_to_string.h
+++ b/security/selinux/include/class_to_string.h
@@ -63,3 +63,4 @@
S_("key")
S_(NULL)
S_("dccp_socket")
+ S_("memprotect")
diff --git a/security/selinux/include/flask.h b/security/selinux/include/flask.h
index 35f309f..a9c2b20 100644
--- a/security/selinux/include/flask.h
+++ b/security/selinux/include/flask.h
@@ -49,6 +49,7 @@
#define SECCLASS_PACKET 57
#define SECCLASS_KEY 58
#define SECCLASS_DCCP_SOCKET 60
+#define SECCLASS_MEMPROTECT 61
/*
* Security identifier indices for initial entities