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author | Lin Feng Shen <shenlinf@cn.ibm.com> | 2006-05-20 21:59:49 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-05-21 19:59:16 (GMT) |
commit | d64b1c878fc1e384ae53d1d40034239bc33848f4 (patch) | |
tree | fe31b26f2db18d021cf04181bd39e08b2beb17f1 | |
parent | 84b3932bf0fd8cdc8c75a5be77e1dded1e6479c6 (diff) | |
download | linux-d64b1c878fc1e384ae53d1d40034239bc33848f4.tar.xz |
[PATCH] NFS: fix error handling on access_ok in compat_sys_nfsservctl
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.
Signed-off-by: Lin Feng Shen <shenlinf@cn.ibm.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Acked-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r-- | fs/compat.c | 177 |
1 files changed, 92 insertions, 85 deletions
diff --git a/fs/compat.c b/fs/compat.c index 01f39f8..b1f6478 100644 --- a/fs/compat.c +++ b/fs/compat.c @@ -2030,109 +2030,115 @@ union compat_nfsctl_res { struct knfsd_fh cr32_getfs; }; -static int compat_nfs_svc_trans(struct nfsctl_arg *karg, struct 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; +static int compat_nfs_svc_trans(struct nfsctl_arg *karg, + struct compat_nfsctl_arg __user *arg) +{ + 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], - &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], - &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], - &arg->ca32_client.cl32_fhkey[0], - NFSCLNT_KEYMAX); +static int compat_nfs_clnt_trans(struct nfsctl_arg *karg, + struct compat_nfsctl_arg __user *arg) +{ + 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) || + __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)) || + __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)) + 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], - &arg->ca32_export.ex32_client[0], - NFSCLNT_IDMAX); - err |= __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); +static int compat_nfs_exp_trans(struct nfsctl_arg *karg, + struct compat_nfsctl_arg __user *arg) +{ + 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) || + __copy_from_user(&karg->ca_export.ex_path[0], + &arg->ca32_export.ex32_path[0], + 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, - &arg->ca32_getfd.gd32_addr, - (sizeof(struct sockaddr))); - err |= __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); +static int compat_nfs_getfd_trans(struct nfsctl_arg *karg, + struct compat_nfsctl_arg __user *arg) +{ + 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))) || + __copy_from_user(&karg->ca_getfd.gd_path, + &arg->ca32_getfd.gd32_path, + (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) +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, - &arg->ca32_getfs.gd32_addr, - (sizeof(struct sockaddr))); - err |= __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); + 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))) || + __copy_from_user(&karg->ca_getfs.gd_path, + &arg->ca32_getfs.gd32_path, + (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 * back a union which contains opaque nfs file handle data. */ -static int compat_nfs_getfh_res_trans(union nfsctl_res *kres, union compat_nfsctl_res __user *res) +static int compat_nfs_getfh_res_trans(union nfsctl_res *kres, + union compat_nfsctl_res __user *res) { int err; @@ -2141,8 +2147,9 @@ static int compat_nfs_getfh_res_trans(union nfsctl_res *kres, union compat_nfsct return (err) ? -EFAULT : 0; } -asmlinkage long compat_sys_nfsservctl(int cmd, struct compat_nfsctl_arg __user *arg, - union compat_nfsctl_res __user *res) +asmlinkage long compat_sys_nfsservctl(int cmd, + struct compat_nfsctl_arg __user *arg, + union compat_nfsctl_res __user *res) { struct nfsctl_arg *karg; union nfsctl_res *kres; |