vfs: Verify acls are valid within superblock's s_user_ns.
Update posix_acl_valid to verify that an acl is within a user namespace. Update the callers of posix_acl_valid to pass in an appropriate user namespace. For posix_acl_xattr_set and v9fs_xattr_set_acl pass in inode->i_sb->s_user_ns to posix_acl_valid. For md_unpack_acl pass in &init_user_ns as no inode or superblock is in sight. Acked-by: Seth Forshee <email@example.com> Signed-off-by: "Eric W. Biederman" <firstname.lastname@example.org>
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