[PATCH v2] xen: Allow xenstored to map /proc/xen/xsd_kva

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xenstored is using mmap() on /proc/xen/xsd_kva, and when the SELinux
boolean "domain_can_mmap_files" in CentOS is set to false the mmap()
call fails.

Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
v2: Declare an interface instead of using allow in xen.te directly.
---
 policy/modules/kernel/filesystem.if | 18 ++++++++++++++++++
 policy/modules/system/xen.te        |  1 +
 2 files changed, 19 insertions(+)

diff --git a/policy/modules/kernel/filesystem.if b/policy/modules/kernel/filesystem.if
index b52fc769236b..b85ae2f6e851 100644
--- a/policy/modules/kernel/filesystem.if
+++ b/policy/modules/kernel/filesystem.if
@@ -5310,6 +5310,24 @@ interface(`fs_manage_xenfs_files',`
 	manage_files_pattern($1, xenfs_t, xenfs_t)
 ')
 
+########################################
+## <summary>
+##	Map files a XENFS filesystem.
+## </summary>
+## <param name="domain">
+##	<summary>
+##	Domain allowed access.
+##	</summary>
+## </param>
+#
+interface(`fs_mmap_xenfs_files',`
+	gen_require(`
+		type xenfs_t;
+	')
+
+	allow $1 xenfs_t:file map;
+')
+
 ########################################
 ## <summary>
 ##	Do not audit attempts to create,
diff --git a/policy/modules/system/xen.te b/policy/modules/system/xen.te
index 2c95d0ca3bbd..82328cbbbaa3 100644
--- a/policy/modules/system/xen.te
+++ b/policy/modules/system/xen.te
@@ -459,6 +459,7 @@ files_read_usr_files(xenstored_t)
 
 fs_search_xenfs(xenstored_t)
 fs_manage_xenfs_files(xenstored_t)
+fs_mmap_xenfs_files(xenstored_t)
 
 term_use_generic_ptys(xenstored_t)
 
-- 
Anthony PERARD




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