[PATCH 5.15 09/11] attr: add setattr_should_drop_sgid()

[Leah Rumancik <leah.rumancik@gmail.com>]

From: Christian Brauner <brauner@kernel.org>

commit 72ae017c5451860443a16fb2a8c243bff3e396b8 upstream.

[backport to 5.15.y, prior to vfsgid_t]

The current setgid stripping logic during write and ownership change
operations is inconsistent and strewn over multiple places. In order to
consolidate it and make more consistent we'll add a new helper
setattr_should_drop_sgid(). The function retains the old behavior where
we remove the S_ISGID bit unconditionally when S_IXGRP is set but also
when it isn't set and the caller is neither in the group of the inode
nor privileged over the inode.

We will use this helper both in write operation permission removal such
as file_remove_privs() as well as in ownership change operations.

Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Tested-by: Leah Rumancik <leah.rumancik@gmail.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/attr.c     | 28 ++++++++++++++++++++++++++++
 fs/internal.h |  6 ++++++
 2 files changed, 34 insertions(+)

diff --git a/fs/attr.c b/fs/attr.c
index f045431bab1a..965be68ed8fa 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -20,6 +20,34 @@
 
 #include "internal.h"
 
+/**
+ * setattr_should_drop_sgid - determine whether the setgid bit needs to be
+ *                            removed
+ * @mnt_userns:	user namespace of the mount @inode was found from
+ * @inode:	inode to check
+ *
+ * This function determines whether the setgid bit needs to be removed.
+ * We retain backwards compatibility and require setgid bit to be removed
+ * unconditionally if S_IXGRP is set. Otherwise we have the exact same
+ * requirements as setattr_prepare() and setattr_copy().
+ *
+ * Return: ATTR_KILL_SGID if setgid bit needs to be removed, 0 otherwise.
+ */
+int setattr_should_drop_sgid(struct user_namespace *mnt_userns,
+			     const struct inode *inode)
+{
+	umode_t mode = inode->i_mode;
+
+	if (!(mode & S_ISGID))
+		return 0;
+	if (mode & S_IXGRP)
+		return ATTR_KILL_SGID;
+	if (!in_group_or_capable(mnt_userns, inode,
+				 i_gid_into_mnt(mnt_userns, inode)))
+		return ATTR_KILL_SGID;
+	return 0;
+}
+
 /*
  * The logic we want is
  *
diff --git a/fs/internal.h b/fs/internal.h
index c89814727281..45cf31d7380b 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -231,3 +231,9 @@ struct xattr_ctx {
 int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
 int do_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 		struct xattr_ctx *ctx);
+
+/*
+ * fs/attr.c
+ */
+int setattr_should_drop_sgid(struct user_namespace *mnt_userns,
+			     const struct inode *inode);
-- 
2.40.0.rc0.216.gc4246ad0f0-goog