From patchwork Wed May 12 01:18:42 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: jvrao X-Patchwork-Id: 52339 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [199.232.76.165]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id D7ECBB7DBA for ; Wed, 12 May 2010 11:22:32 +1000 (EST) Received: from localhost ([127.0.0.1]:39465 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OC0eZ-0003mQ-Mm for incoming@patchwork.ozlabs.org; Tue, 11 May 2010 21:22:27 -0400 Received: from [140.186.70.92] (port=37713 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OC0XU-000094-9A for qemu-devel@nongnu.org; Tue, 11 May 2010 21:15:09 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OC0XM-00076P-H6 for qemu-devel@nongnu.org; Tue, 11 May 2010 21:15:08 -0400 Received: from e34.co.us.ibm.com ([32.97.110.152]:34330) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OC0XM-000768-BN for qemu-devel@nongnu.org; Tue, 11 May 2010 21:15:00 -0400 Received: from d03relay05.boulder.ibm.com (d03relay05.boulder.ibm.com [9.17.195.107]) by e34.co.us.ibm.com (8.14.3/8.13.1) with ESMTP id o4C17ZqX028558 for ; Tue, 11 May 2010 19:07:35 -0600 Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by d03relay05.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id o4C1ExuN115424 for ; Tue, 11 May 2010 19:14:59 -0600 Received: from d03av02.boulder.ibm.com (loopback [127.0.0.1]) by d03av02.boulder.ibm.com (8.14.3/8.13.1/NCO v10.0 AVout) with ESMTP id o4C1ExUS010576 for ; Tue, 11 May 2010 19:14:59 -0600 Received: from localhost.localdomain (elm9m80.beaverton.ibm.com [9.47.81.80]) by d03av02.boulder.ibm.com (8.14.3/8.13.1/NCO v10.0 AVin) with ESMTP id o4C1EqKm010374; Tue, 11 May 2010 19:14:58 -0600 From: "Venkateswararao Jujjuri (JV)" To: qemu-devel@nongnu.org Date: Tue, 11 May 2010 18:18:42 -0700 Message-Id: <1273627123-32534-7-git-send-email-jvrao@linux.vnet.ibm.com> X-Mailer: git-send-email 1.6.0.6 In-Reply-To: <1273627123-32534-1-git-send-email-jvrao@linux.vnet.ibm.com> References: <1273627123-32534-1-git-send-email-jvrao@linux.vnet.ibm.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) Cc: aliguori@us.ibm.com, "Venkateswararao Jujjuri \(JV\)" Subject: [Qemu-devel] [PATCH-V2 6/7] virtio-9p: Implemented Security model for lstat and fstat X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Signed-off-by: Venkateswararao Jujjuri --- hw/virtio-9p-local.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++--- 1 files changed, 63 insertions(+), 4 deletions(-) diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c index 992ad09..2e24dbe 100644 --- a/hw/virtio-9p-local.c +++ b/hw/virtio-9p-local.c @@ -27,9 +27,40 @@ static const char *rpath(FsContext *ctx, const char *path) return buffer; } -static int local_lstat(FsContext *ctx, const char *path, struct stat *stbuf) + +static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf) { - return lstat(rpath(ctx, path), stbuf); + int err; + err = lstat(rpath(fs_ctx, path), stbuf); + if (err) { + return err; + } + if (fs_ctx->fs_sm == sm_mapped) { + /* Actual credentials are part of extended attrs */ + uid_t tmp_uid; + gid_t tmp_gid; + mode_t tmp_mode; + dev_t tmp_dev; + if (getxattr(rpath(fs_ctx, path), "user.virtfs.uid", &tmp_uid, + sizeof(uid_t)) > 0) { + stbuf->st_uid = tmp_uid; + } + if (getxattr(rpath(fs_ctx, path), "user.virtfs.gid", &tmp_gid, + sizeof(gid_t)) > 0) { + stbuf->st_gid = tmp_gid; + } + if (getxattr(rpath(fs_ctx, path), "user.virtfs.mode", &tmp_mode, + sizeof(mode_t)) > 0) { + stbuf->st_mode = tmp_mode; + } + if (S_ISCHR(tmp_mode) || S_ISCHR(tmp_mode)) { + if (getxattr(rpath(fs_ctx, path), "user.virtfs.rdev", &tmp_dev, + sizeof(dev_t)) > 0) { + stbuf->st_rdev = tmp_dev; + } + } + } + return err; } static int local_set_xattr(const char *path, FsCred *credp) @@ -192,9 +223,37 @@ static int local_mkdir(FsContext *fs_ctx, const char *path, FsCred *credp) return err; } -static int local_fstat(FsContext *ctx, int fd, struct stat *stbuf) +static int local_fstat(FsContext *fs_ctx, int fd, struct stat *stbuf) { - return fstat(fd, stbuf); + int err; + err = fstat(fd, stbuf); + if (err) { + return err; + } + if (fs_ctx->fs_sm == sm_mapped) { + /* Actual credentials are part of extended attrs */ + uid_t tmp_uid; + gid_t tmp_gid; + mode_t tmp_mode; + dev_t tmp_dev; + + if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) { + stbuf->st_uid = tmp_uid; + } + if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) { + stbuf->st_gid = tmp_gid; + } + if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) { + stbuf->st_mode = tmp_mode; + } + if (S_ISCHR(tmp_mode) || S_ISCHR(tmp_mode)) { + if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, + sizeof(dev_t)) > 0) { + stbuf->st_rdev = tmp_dev; + } + } + } + return err; } static int local_open2(FsContext *fs_ctx, const char *path, int flags,