Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752517AbXBIXAJ (ORCPT ); Fri, 9 Feb 2007 18:00:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752516AbXBIXAI (ORCPT ); Fri, 9 Feb 2007 18:00:08 -0500 Received: from e32.co.us.ibm.com ([32.97.110.150]:33024 "EHLO e32.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423359AbXBIWxh (ORCPT ); Fri, 9 Feb 2007 17:53:37 -0500 Subject: [PATCH 08/22] elevate mount count for extended attributes To: linux-kernel@vger.kernel.org Cc: akpm@osdl.org, hch@infradead.org, Dave Hansen From: Dave Hansen Date: Fri, 09 Feb 2007 14:53:34 -0800 References: <20070209225329.27619A62@localhost.localdomain> In-Reply-To: <20070209225329.27619A62@localhost.localdomain> Message-Id: <20070209225334.7F6979B6@localhost.localdomain> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2858 Lines: 92 This basically audits the callers of xattr_permission(), which calls permission() and can perform writes to the filesystem. Signed-off-by: Dave Hansen --- lxc-dave/fs/nfsd/nfs4proc.c | 7 ++++++- lxc-dave/fs/xattr.c | 14 ++++++++++++++ 2 files changed, 20 insertions(+), 1 deletion(-) diff -puN fs/nfsd/nfs4proc.c~10-24-elevate-mount-count-for-extended-attributes fs/nfsd/nfs4proc.c --- lxc/fs/nfsd/nfs4proc.c~10-24-elevate-mount-count-for-extended-attributes 2007-02-09 14:26:51.000000000 -0800 +++ lxc-dave/fs/nfsd/nfs4proc.c 2007-02-09 14:26:51.000000000 -0800 @@ -626,14 +626,19 @@ nfsd4_setattr(struct svc_rqst *rqstp, st return status; } } + status = mnt_want_write(cstate->current_fh.fh_export->ex_mnt); + if (status) + return status; status = nfs_ok; if (setattr->sa_acl != NULL) status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh, setattr->sa_acl); if (status) - return status; + goto out; status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr, 0, (time_t)0); +out: + mnt_drop_write(cstate->current_fh.fh_export->ex_mnt); return status; } diff -puN fs/xattr.c~10-24-elevate-mount-count-for-extended-attributes fs/xattr.c --- lxc/fs/xattr.c~10-24-elevate-mount-count-for-extended-attributes 2007-02-09 14:26:51.000000000 -0800 +++ lxc-dave/fs/xattr.c 2007-02-09 14:26:51.000000000 -0800 @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -237,7 +238,11 @@ sys_setxattr(char __user *path, char __u error = user_path_walk(path, &nd); if (error) return error; + error = mnt_want_write(nd.mnt); + if (error) + return error; error = setxattr(nd.dentry, name, value, size, flags); + mnt_drop_write(nd.mnt); path_release(&nd); return error; } @@ -252,7 +257,11 @@ sys_lsetxattr(char __user *path, char __ error = user_path_walk_link(path, &nd); if (error) return error; + error = mnt_want_write(nd.mnt); + if (error) + return error; error = setxattr(nd.dentry, name, value, size, flags); + mnt_drop_write(nd.mnt); path_release(&nd); return error; } @@ -268,9 +277,14 @@ sys_fsetxattr(int fd, char __user *name, f = fget(fd); if (!f) return error; + error = mnt_want_write(f->f_vfsmnt); + if (error) + goto out_fput; dentry = f->f_path.dentry; audit_inode(NULL, dentry->d_inode); error = setxattr(dentry, name, value, size, flags); + mnt_drop_write(f->f_vfsmnt); +out_fput: fput(f); return error; } _ - 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/