apparmor: export set of capabilities supported by the apparmor module

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Seth Arnold <seth.arnold@canonical.com>

4 files changed, 15 insertions, 1 deletions

diff --git a/security/apparmor/Makefile b/security/apparmor/Makefile
index 5706b74c857f..0831e049072d 100644
--- a/security/apparmor/Makefile
+++ b/security/apparmor/Makefile
@@ -18,7 +18,11 @@ quiet_cmd_make-caps = GEN     $@
 cmd_make-caps = echo "static const char *const capability_names[] = {" > $@ ;\
         sed $< >>$@ -r -n -e '/CAP_FS_MASK/d' \
         -e 's/^\#define[ \t]+CAP_([A-Z0-9_]+)[ \t]+([0-9]+)/[\2] = "\L\1",/p';\
-        echo "};" >> $@
+        echo "};" >> $@ ;\
+        echo -n '\#define AA_FS_CAPS_MASK "' >> $@ ;\
+        sed $< -r -n -e '/CAP_FS_MASK/d' \
+            -e 's/^\#define[ \t]+CAP_([A-Z0-9_]+)[ \t]+([0-9]+)/\L\1/p' | \
+             tr '\n' ' ' | sed -e 's/ $$/"\n/' >> $@
 
 
 # Build a lower case string table of rlimit names.
diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 7a26608a5666..d708a55d072f 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -773,6 +773,7 @@ static struct aa_fs_entry aa_fs_entry_features[] = {
         AA_FS_DIR("file",                       aa_fs_entry_file),
         AA_FS_FILE_U64("capability",            VFS_CAP_FLAGS_MASK),
         AA_FS_DIR("rlimit",                     aa_fs_entry_rlimit),
+        AA_FS_DIR("caps",                       aa_fs_entry_caps),
         { }
 };
 
diff --git a/security/apparmor/capability.c b/security/apparmor/capability.c
index 887a5e948945..84d1f5f53877 100644
--- a/security/apparmor/capability.c
+++ b/security/apparmor/capability.c
@@ -27,6 +27,11 @@
  */
 #include "capability_names.h"
 
+struct aa_fs_entry aa_fs_entry_caps[] = {
+        AA_FS_FILE_STRING("mask", AA_FS_CAPS_MASK),
+        { }
+};
+
 struct audit_cache {
         struct aa_profile *profile;
         kernel_cap_t caps;
diff --git a/security/apparmor/include/capability.h b/security/apparmor/include/capability.h
index c24d2959ea02..2e7c9d6a2f3b 100644
--- a/security/apparmor/include/capability.h
+++ b/security/apparmor/include/capability.h
@@ -17,6 +17,8 @@
 
 #include <linux/sched.h>
 
+#include "apparmorfs.h"
+
 struct aa_profile;
 
 /* aa_caps - confinement data for capabilities
@@ -34,6 +36,8 @@ struct aa_caps {
         kernel_cap_t extended;
 };
 
+extern struct aa_fs_entry aa_fs_entry_caps[];
+
 int aa_capable(struct task_struct *task, struct aa_profile *profile, int cap,
                int audit);