Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933147AbbLGVXj (ORCPT ); Mon, 7 Dec 2015 16:23:39 -0500 Received: from mail-ig0-f175.google.com ([209.85.213.175]:33874 "EHLO mail-ig0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932966AbbLGVXa (ORCPT ); Mon, 7 Dec 2015 16:23:30 -0500 From: Seth Forshee To: "Eric W. Biederman" Cc: Alexander Viro , Serge Hallyn , Richard Weinberger , Austin S Hemmelgarn , Miklos Szeredi , linux-bcache@vger.kernel.org, dm-devel@redhat.com, linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org, fuse-devel@lists.sourceforge.net, linux-security-module@vger.kernel.org, selinux@tycho.nsa.gov, Seth Forshee Subject: [PATCH v2 08/18] cred: Reject inodes with invalid ids in set_create_file_as() Date: Mon, 7 Dec 2015 15:21:17 -0600 Message-Id: <1449523289-144238-9-git-send-email-seth.forshee@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1449523289-144238-1-git-send-email-seth.forshee@canonical.com> References: <1449523289-144238-1-git-send-email-seth.forshee@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1036 Lines: 31 Using INVALID_[UG]ID for the LSM file creation context doesn't make sense, so return an error if the inode passed to set_create_file_as() has an invalid id. Signed-off-by: Seth Forshee Acked-by: Serge Hallyn --- kernel/cred.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/cred.c b/kernel/cred.c index 71179a09c1d6..ff8606f77d90 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -689,6 +689,8 @@ EXPORT_SYMBOL(set_security_override_from_ctx); */ int set_create_files_as(struct cred *new, struct inode *inode) { + if (!uid_valid(inode->i_uid) || !gid_valid(inode->i_gid)) + return -EINVAL; new->fsuid = inode->i_uid; new->fsgid = inode->i_gid; return security_kernel_create_files_as(new, inode); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/