From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756106Ab2J0Me0 (ORCPT ); Sat, 27 Oct 2012 08:34:26 -0400 Received: from mail-gh0-f174.google.com ([209.85.160.174]:35968 "EHLO mail-gh0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755041Ab2J0MeU (ORCPT ); Sat, 27 Oct 2012 08:34:20 -0400 From: Jeff Layton To: viro@zeniv.linux.org.uk Cc: linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, michael.brantley@deshaw.com, hch@infradead.org, miklos@szeredi.hu, pstaubach@exagrid.com Subject: [PATCH v8 16/32] vfs: make chroot retry once on ESTALE error Date: Sat, 27 Oct 2012 08:33:23 -0400 Message-Id: <1351341219-17837-17-git-send-email-jlayton@redhat.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1351341219-17837-1-git-send-email-jlayton@redhat.com> References: <1351341219-17837-1-git-send-email-jlayton@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Jeff Layton --- fs/open.c | 37 +++++++++++++++++++++---------------- 1 file changed, 21 insertions(+), 16 deletions(-) diff --git a/fs/open.c b/fs/open.c index 5c2a973..a1331f1 100644 --- a/fs/open.c +++ b/fs/open.c @@ -434,27 +434,32 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename) { struct path path; int error; + int lookup_flags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY; + unsigned int try = 0; - error = user_path_dir(filename, &path); - if (error) - goto out; + do { + error = user_path_at(AT_FDCWD, filename, lookup_flags, &path); + if (error) + break; - error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR); - if (error) - goto dput_and_out; + error = inode_permission(path.dentry->d_inode, + MAY_EXEC | MAY_CHDIR); + if (error) + goto dput_and_out; - error = -EPERM; - if (!capable(CAP_SYS_CHROOT)) - goto dput_and_out; - error = security_path_chroot(&path); - if (error) - goto dput_and_out; + error = -EPERM; + if (!capable(CAP_SYS_CHROOT)) + goto dput_and_out; + error = security_path_chroot(&path); + if (error) + goto dput_and_out; - set_fs_root(current->fs, &path); - error = 0; + set_fs_root(current->fs, &path); + error = 0; dput_and_out: - path_put(&path); -out: + path_put(&path); + lookup_flags |= LOOKUP_REVAL; + } while (retry_estale(error, try++)); return error; } -- 1.7.11.7