AppArmor: add initial "features" directory to securityfs
This adds the "features" subdirectory to the AppArmor securityfs
to display boolean features flags and the known capability mask.
Signed-off-by: Kees Cook <kees@ubuntu.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
index 1e22bb3..f30dada 100644
--- a/security/apparmor/apparmorfs.c
+++ b/security/apparmor/apparmorfs.c
@@ -18,6 +18,7 @@
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/namei.h>
+#include <linux/capability.h>
#include "include/apparmor.h"
#include "include/apparmorfs.h"
@@ -142,12 +143,62 @@
.llseek = default_llseek,
};
+static int aa_fs_seq_show(struct seq_file *seq, void *v)
+{
+ struct aa_fs_entry *fs_file = seq->private;
+
+ if (!fs_file)
+ return 0;
+
+ switch (fs_file->v_type) {
+ case AA_FS_TYPE_BOOLEAN:
+ seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
+ break;
+ case AA_FS_TYPE_U64:
+ seq_printf(seq, "%#08lx\n", fs_file->v.u64);
+ break;
+ default:
+ /* Ignore unpritable entry types. */
+ break;
+ }
+
+ return 0;
+}
+
+static int aa_fs_seq_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, aa_fs_seq_show, inode->i_private);
+}
+
+const struct file_operations aa_fs_seq_file_ops = {
+ .owner = THIS_MODULE,
+ .open = aa_fs_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
/** Base file system setup **/
+static struct aa_fs_entry aa_fs_entry_domain[] = {
+ AA_FS_FILE_BOOLEAN("change_hat", 1),
+ AA_FS_FILE_BOOLEAN("change_hatv", 1),
+ AA_FS_FILE_BOOLEAN("change_onexec", 1),
+ AA_FS_FILE_BOOLEAN("change_profile", 1),
+ { }
+};
+
+static struct aa_fs_entry aa_fs_entry_features[] = {
+ AA_FS_DIR("domain", aa_fs_entry_domain),
+ AA_FS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
+ { }
+};
+
static struct aa_fs_entry aa_fs_entry_apparmor[] = {
AA_FS_FILE_FOPS(".load", 0640, &aa_fs_profile_load),
AA_FS_FILE_FOPS(".replace", 0640, &aa_fs_profile_replace),
AA_FS_FILE_FOPS(".remove", 0640, &aa_fs_profile_remove),
+ AA_FS_DIR("features", aa_fs_entry_features),
{ }
};
diff --git a/security/apparmor/include/apparmorfs.h b/security/apparmor/include/apparmorfs.h
index 4fdf02f..16e6545 100644
--- a/security/apparmor/include/apparmorfs.h
+++ b/security/apparmor/include/apparmorfs.h
@@ -16,6 +16,8 @@
#define __AA_APPARMORFS_H
enum aa_fs_type {
+ AA_FS_TYPE_BOOLEAN,
+ AA_FS_TYPE_U64,
AA_FS_TYPE_FOPS,
AA_FS_TYPE_DIR,
};
@@ -28,11 +30,23 @@
umode_t mode;
enum aa_fs_type v_type;
union {
+ bool boolean;
+ unsigned long u64;
struct aa_fs_entry *files;
} v;
const struct file_operations *file_ops;
};
+extern const struct file_operations aa_fs_seq_file_ops;
+
+#define AA_FS_FILE_BOOLEAN(_name, _value) \
+ { .name = (_name), .mode = 0444, \
+ .v_type = AA_FS_TYPE_BOOLEAN, .v.boolean = (_value), \
+ .file_ops = &aa_fs_seq_file_ops }
+#define AA_FS_FILE_U64(_name, _value) \
+ { .name = (_name), .mode = 0444, \
+ .v_type = AA_FS_TYPE_U64, .v.u64 = (_value), \
+ .file_ops = &aa_fs_seq_file_ops }
#define AA_FS_FILE_FOPS(_name, _mode, _fops) \
{ .name = (_name), .v_type = AA_FS_TYPE_FOPS, \
.mode = (_mode), .file_ops = (_fops) }