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Message-Id: <1444073830-21854-15-git-send-email-agruenba@redhat.com>
Date: Mon, 5 Oct 2015 21:36:41 +0200
From: Andreas Gruenbacher <agruenba@...hat.com>
To: Alexander Viro <viro@...iv.linux.org.uk>,
"Theodore Ts'o" <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>,
"J. Bruce Fields" <bfields@...ldses.org>,
Jeff Layton <jlayton@...chiereds.net>,
Trond Myklebust <trond.myklebust@...marydata.com>,
Anna Schumaker <anna.schumaker@...app.com>,
linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
linux-api@...r.kernel.org
Subject: [PATCH v9 14/43] richacl: Check if an acl is equivalent to a file mode
ACLs are considered equivalent to file modes if they only consist of
owner@, group@, and everyone@ entries, the owner@ permissions do not
depend on whether the owner is a member in the owning group, and no
inheritance flags are set. This test is used to avoid storing richacls
if the acl can be computed from the file permission bits.
Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
Reviewed-by: J. Bruce Fields <bfields@...hat.com>
---
fs/richacl_base.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/richacl.h | 1 +
2 files changed, 105 insertions(+)
diff --git a/fs/richacl_base.c b/fs/richacl_base.c
index d4480e5..8832ba6 100644
--- a/fs/richacl_base.c
+++ b/fs/richacl_base.c
@@ -380,3 +380,107 @@ __richacl_chmod(struct richacl *acl, mode_t mode)
return clone;
}
EXPORT_SYMBOL_GPL(__richacl_chmod);
+
+/**
+ * richacl_equiv_mode - compute the mode equivalent of @acl
+ *
+ * An acl is considered equivalent to a file mode if it only consists of
+ * owner@, group@, and everyone@ entries and the owner@ permissions do not
+ * depend on whether the owner is a member in the owning group.
+ */
+int
+richacl_equiv_mode(const struct richacl *acl, mode_t *mode_p)
+{
+ mode_t mode = *mode_p;
+
+ /*
+ * The RICHACE_DELETE_CHILD flag is meaningless for non-directories, so
+ * we ignore it.
+ */
+ unsigned int x = S_ISDIR(mode) ? 0 : RICHACE_DELETE_CHILD;
+ struct {
+ unsigned int allowed;
+ unsigned int defined; /* allowed or denied */
+ } owner = {
+ .defined = RICHACE_POSIX_ALWAYS_ALLOWED |
+ RICHACE_POSIX_OWNER_ALLOWED | x,
+ }, group = {
+ .defined = RICHACE_POSIX_ALWAYS_ALLOWED | x,
+ }, everyone = {
+ .defined = RICHACE_POSIX_ALWAYS_ALLOWED | x,
+ };
+ const struct richace *ace;
+
+ if (acl->a_flags & ~(RICHACL_WRITE_THROUGH | RICHACL_MASKED))
+ return -1;
+
+ richacl_for_each_entry(ace, acl) {
+ if (ace->e_flags & ~RICHACE_SPECIAL_WHO)
+ return -1;
+
+ if (richace_is_owner(ace) || richace_is_everyone(ace)) {
+ x = ace->e_mask & ~owner.defined;
+ if (richace_is_allow(ace)) {
+ unsigned int group_denied =
+ group.defined & ~group.allowed;
+
+ if (x & group_denied)
+ return -1;
+ owner.allowed |= x;
+ } else /* if (richace_is_deny(ace)) */ {
+ if (x & group.allowed)
+ return -1;
+ }
+ owner.defined |= x;
+
+ if (richace_is_everyone(ace)) {
+ x = ace->e_mask;
+ if (richace_is_allow(ace)) {
+ group.allowed |=
+ x & ~group.defined;
+ everyone.allowed |=
+ x & ~everyone.defined;
+ }
+ group.defined |= x;
+ everyone.defined |= x;
+ }
+ } else if (richace_is_group(ace)) {
+ x = ace->e_mask & ~group.defined;
+ if (richace_is_allow(ace))
+ group.allowed |= x;
+ group.defined |= x;
+ } else
+ return -1;
+ }
+
+ if (group.allowed & ~owner.defined)
+ return -1;
+
+ if (acl->a_flags & RICHACL_MASKED) {
+ if (acl->a_flags & RICHACL_WRITE_THROUGH) {
+ owner.allowed = acl->a_owner_mask;
+ everyone.allowed = acl->a_other_mask;
+ } else {
+ owner.allowed &= acl->a_owner_mask;
+ everyone.allowed &= acl->a_other_mask;
+ }
+ group.allowed &= acl->a_group_mask;
+ }
+
+ mode = (mode & ~S_IRWXUGO) |
+ (richacl_mask_to_mode(owner.allowed) << 6) |
+ (richacl_mask_to_mode(group.allowed) << 3) |
+ richacl_mask_to_mode(everyone.allowed);
+
+ /* Mask flags we can ignore */
+ x = S_ISDIR(mode) ? 0 : RICHACE_DELETE_CHILD;
+
+ if (((richacl_mode_to_mask(mode >> 6) ^ owner.allowed) & ~x) ||
+ ((richacl_mode_to_mask(mode >> 3) ^ group.allowed) & ~x) ||
+ ((richacl_mode_to_mask(mode) ^ everyone.allowed) & ~x))
+ return -1;
+
+ *mode_p = mode;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(richacl_equiv_mode);
diff --git a/include/linux/richacl.h b/include/linux/richacl.h
index 51e8314..c715f82 100644
--- a/include/linux/richacl.h
+++ b/include/linux/richacl.h
@@ -304,6 +304,7 @@ extern unsigned int richacl_mode_to_mask(mode_t);
extern unsigned int richacl_want_to_mask(unsigned int);
extern void richacl_compute_max_masks(struct richacl *);
extern struct richacl *__richacl_chmod(struct richacl *, mode_t);
+extern int richacl_equiv_mode(const struct richacl *, mode_t *);
/* richacl_inode.c */
extern int richacl_permission(struct inode *, const struct richacl *, int);
--
2.5.0
--
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