Automatic Inheritance (AI) allows changes to the acl of a directory to
propagate down to children.

This is mostly implemented in user space: when a process changes the
permissions of a directory and Automatic Inheritance is enabled for that
directory, the process must propagate those changes to all children,
recursively.

The kernel enables this by keeping track of which permissions have been
inherited at create time.  In addition, it makes sure that permission
propagation is turned off when the permissions are set explicitly (for
example, upon create or chmod).

Automatic Inheritance works as follows:

 - When the RICHACL_AUTO_INHERIT flag in the acl of a file or directory
   is not set, the file or directory is not affected by AI.

 - When the RICHACL_AUTO_INHERIT flag in the acl of a directory is set
   and a file or subdirectory is created in that directory, the
   inherited acl will have the RICHACL_AUTO_INHERIT flag set, and all
   inherited aces will have the RICHACE_INHERITED_ACE flag set.  This
   allows user space to distinguish between aces which have been
   inherited and aces which have been explicitly added.

 - When the RICHACL_PROTECTED acl flag in the acl of a file or directory
   is set, AI will not modify the acl.  This does not affect propagation
   of permissions from the file to its children (if the file is a
   directory).

Linux does not have a way of creating files or directories without setting the
file permission bits, so all files created inside a directory with
RICHACL_AUTO_INHERIT set will have the RICHACL_PROTECTED flag set.  This
effectively disables Automatic Inheritance.

Protocols which support creating files without specifying permissions can
explicitly clear the RICHACL_PROTECTED flag after creating a file and reset the
file masks to "undo" applying the create mode; see richacl_compute_max_masks().
They should set the RICHACL_DEFAULTED flag.  (A mechanism that would allow to
indicate to the kernel to ignore the create mode in the first place when there
are inherited permissions would be nice to have.)

Signed-off-by: Andreas Gruenbacher <agrue...@redhat.com>
Reviewed-by: J. Bruce Fields <bfie...@redhat.com>
---
 fs/richacl_base.c            | 10 +++++++++-
 fs/richacl_inode.c           |  7 +++++++
 include/linux/richacl.h      | 12 ++++++++++++
 include/uapi/linux/richacl.h | 11 ++++++++++-
 4 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/fs/richacl_base.c b/fs/richacl_base.c
index 9f7d91d..2a9c448 100644
--- a/fs/richacl_base.c
+++ b/fs/richacl_base.c
@@ -366,7 +366,8 @@ __richacl_chmod(struct richacl *acl, umode_t mode)
            acl->a_group_mask == group_mask &&
            acl->a_other_mask == other_mask &&
            (acl->a_flags & RICHACL_MASKED) &&
-           (acl->a_flags & RICHACL_WRITE_THROUGH))
+           (acl->a_flags & RICHACL_WRITE_THROUGH) &&
+           (!richacl_is_auto_inherit(acl) || richacl_is_protected(acl)))
                return acl;
 
        clone = richacl_clone(acl, GFP_KERNEL);
@@ -378,6 +379,8 @@ __richacl_chmod(struct richacl *acl, umode_t mode)
        clone->a_owner_mask = owner_mask;
        clone->a_group_mask = group_mask;
        clone->a_other_mask = other_mask;
+       if (richacl_is_auto_inherit(clone))
+               clone->a_flags |= RICHACL_PROTECTED;
 
        return clone;
 }
@@ -551,6 +554,11 @@ richacl_inherit(const struct richacl *dir_acl, int isdir)
                        ace++;
                }
        }
+       if (richacl_is_auto_inherit(dir_acl)) {
+               acl->a_flags = RICHACL_AUTO_INHERIT;
+               richacl_for_each_entry(ace, acl)
+                       ace->e_flags |= RICHACE_INHERITED_ACE;
+       }
 
        return acl;
 }
diff --git a/fs/richacl_inode.c b/fs/richacl_inode.c
index d2bf076..24276da 100644
--- a/fs/richacl_inode.c
+++ b/fs/richacl_inode.c
@@ -277,6 +277,13 @@ richacl_inherit_inode(const struct richacl *dir_acl, 
umode_t *mode_p)
                        richacl_put(acl);
                        acl = NULL;
                } else {
+                       /*
+                        * We need to set RICHACL_PROTECTED because we are
+                        * doing an implicit chmod
+                        */
+                       if (richacl_is_auto_inherit(acl))
+                               acl->a_flags |= RICHACL_PROTECTED;
+
                        richacl_compute_max_masks(acl);
                        /*
                         * Ensure that the acl will not grant any permissions
diff --git a/include/linux/richacl.h b/include/linux/richacl.h
index 302872b..7cfa64d 100644
--- a/include/linux/richacl.h
+++ b/include/linux/richacl.h
@@ -76,6 +76,18 @@ extern void set_cached_richacl(struct inode *, struct 
richacl *);
 extern void forget_cached_richacl(struct inode *);
 extern struct richacl *get_richacl(struct inode *);
 
+static inline int
+richacl_is_auto_inherit(const struct richacl *acl)
+{
+       return acl->a_flags & RICHACL_AUTO_INHERIT;
+}
+
+static inline int
+richacl_is_protected(const struct richacl *acl)
+{
+       return acl->a_flags & RICHACL_PROTECTED;
+}
+
 /**
  * richace_is_owner  -  check if @ace is an OWNER@ entry
  */
diff --git a/include/uapi/linux/richacl.h b/include/uapi/linux/richacl.h
index 1ed48ac..8849a53 100644
--- a/include/uapi/linux/richacl.h
+++ b/include/uapi/linux/richacl.h
@@ -18,6 +18,9 @@
 #define __UAPI_RICHACL_H
 
 /* a_flags values */
+#define RICHACL_AUTO_INHERIT                   0x01
+#define RICHACL_PROTECTED                      0x02
+#define RICHACL_DEFAULTED                      0x04
 #define RICHACL_WRITE_THROUGH                  0x40
 #define RICHACL_MASKED                         0x80
 
@@ -31,6 +34,7 @@
 #define RICHACE_NO_PROPAGATE_INHERIT_ACE       0x0004
 #define RICHACE_INHERIT_ONLY_ACE               0x0008
 #define RICHACE_IDENTIFIER_GROUP               0x0040
+#define RICHACE_INHERITED_ACE                  0x0080
 #define RICHACE_SPECIAL_WHO                    0x4000
 
 /* e_mask bitflags */
@@ -60,6 +64,9 @@
 #define RICHACE_EVERYONE_SPECIAL_ID            2
 
 #define RICHACL_VALID_FLAGS (                                  \
+       RICHACL_AUTO_INHERIT |                                  \
+       RICHACL_PROTECTED |                                     \
+       RICHACL_DEFAULTED |                                     \
        RICHACL_WRITE_THROUGH |                                 \
        RICHACL_MASKED )
 
@@ -69,13 +76,15 @@
        RICHACE_NO_PROPAGATE_INHERIT_ACE |                      \
        RICHACE_INHERIT_ONLY_ACE |                              \
        RICHACE_IDENTIFIER_GROUP |                              \
+       RICHACE_INHERITED_ACE |                                 \
        RICHACE_SPECIAL_WHO )
 
 #define RICHACE_INHERITANCE_FLAGS (                            \
        RICHACE_FILE_INHERIT_ACE |                              \
        RICHACE_DIRECTORY_INHERIT_ACE |                         \
        RICHACE_NO_PROPAGATE_INHERIT_ACE |                      \
-       RICHACE_INHERIT_ONLY_ACE )
+       RICHACE_INHERIT_ONLY_ACE |                              \
+       RICHACE_INHERITED_ACE )
 
 /* Valid RICHACE_* flags for directories and non-directories */
 #define RICHACE_VALID_MASK (                                   \
-- 
2.5.0

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