From: apgo@patchbomb.org (Arthur Othieno)
To: Lin Feng Shen <shenlinf@cn.ibm.com>
Cc: neilb@cse.unsw.edu.au, nfs@lists.sourceforge.net,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] NFS: fix error handling on access_ok in compat_sys_nfsservctl
Date: Thu, 11 May 2006 23:29:13 -0400 [thread overview]
Message-ID: <20060512032913.GA9202@krypton> (raw)
In-Reply-To: <4462D816.7090207@cn.ibm.com>
On Thu, May 11, 2006 at 02:22:14PM +0800, Lin Feng Shen wrote:
> From: Lin Feng Shen <shenlinf@cn.ibm.com>
>
> Functions compat_nfs_svc_trans, compat_nfs_clnt_trans, compat_nfs_exp_trans,
> compat_nfs_getfd_trans and compat_nfs_getfs_trans, which are called by
> compat_sys_nfsservctl(fs/compat.c), don't handle the return value of
> access_ok properly. access_ok return 1 when the addr is valid, and 0
> when it's not, but these functions have the reversed understanding. When the
> address is valid, they always return -EFAULT to compat_sys_nfsservctl.
>
> An example is to run /usr/sbin/rpc.nfsd(32bit program on Power5). It doesn't
> function as expected. strace showes that nfsservctl returns -EFAULT.
>
> The patch fixes this by correcting the error handling on the return value of
> access_ok in the five functions. It is created against
> linux-2.6.17-rc3-git16.
>
> Signed-off-by: Lin Feng Shen <shenlinf@cn.ibm.com>
> ---
>
> --- linux-2.6.17-rc3-git16/fs/compat.c.orig 2006-05-09
> 09:07:38.000000000 -0500
> +++ linux-2.6.17-rc3-git16/fs/compat.c 2006-05-09 09:21:00.000000000
> -0500
> @@ -2032,101 +2032,96 @@ union compat_nfsctl_res {
>
> static int compat_nfs_svc_trans(struct nfsctl_arg *karg, struct
> compat_nfsctl_arg __user *arg)
Your client is happily munging whitespace all over:
patching file fs/compat.c
patch: **** malformed patch at line 25: compat_nfsctl_arg __user *arg)
> {
> - int err;
> -
> - err = access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc));
> - err |= get_user(karg->ca_version, &arg->ca32_version);
> - err |= __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port);
> - err |= __get_user(karg->ca_svc.svc_nthreads,
> &arg->ca32_svc.svc32_nthreads);
> - return (err) ? -EFAULT : 0;
> + if(!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
> + get_user(karg->ca_version, &arg->ca32_version) ||
> + __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
> + __get_user(karg->ca_svc.svc_nthreads,
> &arg->ca32_svc.svc32_nthreads))
> + return -EFAULT;
> + return 0;
> }
>
> static int compat_nfs_clnt_trans(struct nfsctl_arg *karg, struct
> compat_nfsctl_arg __user *arg)
> {
> - int err;
> -
> - err = access_ok(VERIFY_READ, &arg->ca32_client,
> sizeof(arg->ca32_client));
> - err |= get_user(karg->ca_version, &arg->ca32_version);
> - err |= __copy_from_user(&karg->ca_client.cl_ident[0],
> + if(!access_ok(VERIFY_READ, &arg->ca32_client,
> sizeof(arg->ca32_client)) ||
> + get_user(karg->ca_version, &arg->ca32_version) ||
> + __copy_from_user(&karg->ca_client.cl_ident[0],
> &arg->ca32_client.cl32_ident[0],
> - NFSCLNT_IDMAX);
> - err |= __get_user(karg->ca_client.cl_naddr,
> &arg->ca32_client.cl32_naddr);
> - err |= __copy_from_user(&karg->ca_client.cl_addrlist[0],
> + NFSCLNT_IDMAX) ||
> + __get_user(karg->ca_client.cl_naddr,
> &arg->ca32_client.cl32_naddr) ||
> + __copy_from_user(&karg->ca_client.cl_addrlist[0],
> &arg->ca32_client.cl32_addrlist[0],
> - (sizeof(struct in_addr) * NFSCLNT_ADDRMAX));
> - err |= __get_user(karg->ca_client.cl_fhkeytype,
> - &arg->ca32_client.cl32_fhkeytype);
> - err |= __get_user(karg->ca_client.cl_fhkeylen,
> - &arg->ca32_client.cl32_fhkeylen);
> - err |= __copy_from_user(&karg->ca_client.cl_fhkey[0],
> + (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
> + __get_user(karg->ca_client.cl_fhkeytype,
> + &arg->ca32_client.cl32_fhkeytype) ||
> + __get_user(karg->ca_client.cl_fhkeylen,
> + &arg->ca32_client.cl32_fhkeylen) ||
> + __copy_from_user(&karg->ca_client.cl_fhkey[0],
> &arg->ca32_client.cl32_fhkey[0],
> - NFSCLNT_KEYMAX);
> + NFSCLNT_KEYMAX))
> + return -EFAULT;
>
> - return (err) ? -EFAULT : 0;
> + return 0;
> }
>
> static int compat_nfs_exp_trans(struct nfsctl_arg *karg, struct
> compat_nfsctl_arg __user *arg)
> {
> - int err;
> -
> - err = access_ok(VERIFY_READ, &arg->ca32_export,
> sizeof(arg->ca32_export));
> - err |= get_user(karg->ca_version, &arg->ca32_version);
> - err |= __copy_from_user(&karg->ca_export.ex_client[0],
> + if(!access_ok(VERIFY_READ, &arg->ca32_export,
> sizeof(arg->ca32_export)) ||
> + get_user(karg->ca_version, &arg->ca32_version) ||
> + __copy_from_user(&karg->ca_export.ex_client[0],
> &arg->ca32_export.ex32_client[0],
> - NFSCLNT_IDMAX);
> - err |= __copy_from_user(&karg->ca_export.ex_path[0],
> + NFSCLNT_IDMAX) ||
> + __copy_from_user(&karg->ca_export.ex_path[0],
> &arg->ca32_export.ex32_path[0],
> - NFS_MAXPATHLEN);
> - err |= __get_user(karg->ca_export.ex_dev,
> - &arg->ca32_export.ex32_dev);
> - err |= __get_user(karg->ca_export.ex_ino,
> - &arg->ca32_export.ex32_ino);
> - err |= __get_user(karg->ca_export.ex_flags,
> - &arg->ca32_export.ex32_flags);
> - err |= __get_user(karg->ca_export.ex_anon_uid,
> - &arg->ca32_export.ex32_anon_uid);
> - err |= __get_user(karg->ca_export.ex_anon_gid,
> - &arg->ca32_export.ex32_anon_gid);
> + NFS_MAXPATHLEN) ||
> + __get_user(karg->ca_export.ex_dev,
> + &arg->ca32_export.ex32_dev) ||
> + __get_user(karg->ca_export.ex_ino,
> + &arg->ca32_export.ex32_ino) ||
> + __get_user(karg->ca_export.ex_flags,
> + &arg->ca32_export.ex32_flags) ||
> + __get_user(karg->ca_export.ex_anon_uid,
> + &arg->ca32_export.ex32_anon_uid) ||
> + __get_user(karg->ca_export.ex_anon_gid,
> + &arg->ca32_export.ex32_anon_gid))
> + return -EFAULT;
> SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
> SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
>
> - return (err) ? -EFAULT : 0;
> + return 0;
> }
>
> static int compat_nfs_getfd_trans(struct nfsctl_arg *karg, struct
> compat_nfsctl_arg __user *arg)
> {
> - int err;
> -
> - err = access_ok(VERIFY_READ, &arg->ca32_getfd,
> sizeof(arg->ca32_getfd));
> - err |= get_user(karg->ca_version, &arg->ca32_version);
> - err |= __copy_from_user(&karg->ca_getfd.gd_addr,
> + if(!access_ok(VERIFY_READ, &arg->ca32_getfd,
> sizeof(arg->ca32_getfd)) ||
> + get_user(karg->ca_version, &arg->ca32_version) ||
> + __copy_from_user(&karg->ca_getfd.gd_addr,
> &arg->ca32_getfd.gd32_addr,
> - (sizeof(struct sockaddr)));
> - err |= __copy_from_user(&karg->ca_getfd.gd_path,
> + (sizeof(struct sockaddr))) ||
> + __copy_from_user(&karg->ca_getfd.gd_path,
> &arg->ca32_getfd.gd32_path,
> - (NFS_MAXPATHLEN+1));
> - err |= __get_user(karg->ca_getfd.gd_version,
> - &arg->ca32_getfd.gd32_version);
> + (NFS_MAXPATHLEN+1)) ||
> + __get_user(karg->ca_getfd.gd_version,
> + &arg->ca32_getfd.gd32_version))
> + return -EFAULT;
>
> - return (err) ? -EFAULT : 0;
> + return 0;
> }
>
> static int compat_nfs_getfs_trans(struct nfsctl_arg *karg, struct
> compat_nfsctl_arg __user *arg)
> {
> - int err;
> -
> - err = access_ok(VERIFY_READ, &arg->ca32_getfs,
> sizeof(arg->ca32_getfs));
> - err |= get_user(karg->ca_version, &arg->ca32_version);
> - err |= __copy_from_user(&karg->ca_getfs.gd_addr,
> + if(!access_ok(VERIFY_READ, &arg->ca32_getfs,
> sizeof(arg->ca32_getfs)) ||
> + get_user(karg->ca_version, &arg->ca32_version) ||
> + __copy_from_user(&karg->ca_getfs.gd_addr,
> &arg->ca32_getfs.gd32_addr,
> - (sizeof(struct sockaddr)));
> - err |= __copy_from_user(&karg->ca_getfs.gd_path,
> + (sizeof(struct sockaddr))) ||
> + __copy_from_user(&karg->ca_getfs.gd_path,
> &arg->ca32_getfs.gd32_path,
> - (NFS_MAXPATHLEN+1));
> - err |= __get_user(karg->ca_getfs.gd_maxlen,
> - &arg->ca32_getfs.gd32_maxlen);
> + (NFS_MAXPATHLEN+1)) ||
> + __get_user(karg->ca_getfs.gd_maxlen,
> + &arg->ca32_getfs.gd32_maxlen))
> + return -EFAULT;
>
> - return (err) ? -EFAULT : 0;
> + return 0;
> }
>
> /* This really doesn't need translations, we are only passing
prev parent reply other threads:[~2006-05-12 3:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-11 6:22 [PATCH 1/1] NFS: fix error handling on access_ok in compat_sys_nfsservctl Lin Feng Shen
2006-05-12 3:29 ` Arthur Othieno [this message]
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