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linux/fs/compat.c
Lin Feng Shen d64b1c878f [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>
2006-05-21 12:59:16 -07:00

2224 lines
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/*
* linux/fs/compat.c
*
* Kernel compatibililty routines for e.g. 32 bit syscall support
* on 64 bit kernels.
*
* Copyright (C) 2002 Stephen Rothwell, IBM Corporation
* Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
* Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
* Copyright (C) 2003 Pavel Machek (pavel@suse.cz)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/linkage.h>
#include <linux/compat.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/namei.h>
#include <linux/file.h>
#include <linux/vfs.h>
#include <linux/ioctl32.h>
#include <linux/ioctl.h>
#include <linux/init.h>
#include <linux/sockios.h> /* for SIOCDEVPRIVATE */
#include <linux/smb.h>
#include <linux/smb_mount.h>
#include <linux/ncp_mount.h>
#include <linux/nfs4_mount.h>
#include <linux/smp_lock.h>
#include <linux/syscalls.h>
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/dirent.h>
#include <linux/fsnotify.h>
#include <linux/highuid.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/syscall.h>
#include <linux/personality.h>
#include <linux/rwsem.h>
#include <linux/acct.h>
#include <linux/mm.h>
#include <net/sock.h> /* siocdevprivate_ioctl */
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/ioctls.h>
extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
/*
* Not all architectures have sys_utime, so implement this in terms
* of sys_utimes.
*/
asmlinkage long compat_sys_utime(char __user *filename, struct compat_utimbuf __user *t)
{
struct timeval tv[2];
if (t) {
if (get_user(tv[0].tv_sec, &t->actime) ||
get_user(tv[1].tv_sec, &t->modtime))
return -EFAULT;
tv[0].tv_usec = 0;
tv[1].tv_usec = 0;
}
return do_utimes(AT_FDCWD, filename, t ? tv : NULL);
}
asmlinkage long compat_sys_futimesat(unsigned int dfd, char __user *filename, struct compat_timeval __user *t)
{
struct timeval tv[2];
if (t) {
if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
get_user(tv[0].tv_usec, &t[0].tv_usec) ||
get_user(tv[1].tv_sec, &t[1].tv_sec) ||
get_user(tv[1].tv_usec, &t[1].tv_usec))
return -EFAULT;
}
return do_utimes(dfd, filename, t ? tv : NULL);
}
asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval __user *t)
{
return compat_sys_futimesat(AT_FDCWD, filename, t);
}
asmlinkage long compat_sys_newstat(char __user * filename,
struct compat_stat __user *statbuf)
{
struct kstat stat;
int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
if (!error)
error = cp_compat_stat(&stat, statbuf);
return error;
}
asmlinkage long compat_sys_newlstat(char __user * filename,
struct compat_stat __user *statbuf)
{
struct kstat stat;
int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
if (!error)
error = cp_compat_stat(&stat, statbuf);
return error;
}
#ifndef __ARCH_WANT_STAT64
asmlinkage long compat_sys_newfstatat(unsigned int dfd, char __user *filename,
struct compat_stat __user *statbuf, int flag)
{
struct kstat stat;
int error = -EINVAL;
if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
goto out;
if (flag & AT_SYMLINK_NOFOLLOW)
error = vfs_lstat_fd(dfd, filename, &stat);
else
error = vfs_stat_fd(dfd, filename, &stat);
if (!error)
error = cp_compat_stat(&stat, statbuf);
out:
return error;
}
#endif
asmlinkage long compat_sys_newfstat(unsigned int fd,
struct compat_stat __user * statbuf)
{
struct kstat stat;
int error = vfs_fstat(fd, &stat);
if (!error)
error = cp_compat_stat(&stat, statbuf);
return error;
}
static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
{
if (sizeof ubuf->f_blocks == 4) {
if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
0xffffffff00000000ULL)
return -EOVERFLOW;
/* f_files and f_ffree may be -1; it's okay
* to stuff that into 32 bits */
if (kbuf->f_files != 0xffffffffffffffffULL
&& (kbuf->f_files & 0xffffffff00000000ULL))
return -EOVERFLOW;
if (kbuf->f_ffree != 0xffffffffffffffffULL
&& (kbuf->f_ffree & 0xffffffff00000000ULL))
return -EOVERFLOW;
}
if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
__put_user(kbuf->f_type, &ubuf->f_type) ||
__put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
__put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
__put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
__put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
__put_user(kbuf->f_files, &ubuf->f_files) ||
__put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
__put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
__put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
__put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
__put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
__put_user(0, &ubuf->f_spare[0]) ||
__put_user(0, &ubuf->f_spare[1]) ||
__put_user(0, &ubuf->f_spare[2]) ||
__put_user(0, &ubuf->f_spare[3]) ||
__put_user(0, &ubuf->f_spare[4]))
return -EFAULT;
return 0;
}
/*
* The following statfs calls are copies of code from fs/open.c and
* should be checked against those from time to time
*/
asmlinkage long compat_sys_statfs(const char __user *path, struct compat_statfs __user *buf)
{
struct nameidata nd;
int error;
error = user_path_walk(path, &nd);
if (!error) {
struct kstatfs tmp;
error = vfs_statfs(nd.dentry->d_inode->i_sb, &tmp);
if (!error)
error = put_compat_statfs(buf, &tmp);
path_release(&nd);
}
return error;
}
asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
{
struct file * file;
struct kstatfs tmp;
int error;
error = -EBADF;
file = fget(fd);
if (!file)
goto out;
error = vfs_statfs(file->f_dentry->d_inode->i_sb, &tmp);
if (!error)
error = put_compat_statfs(buf, &tmp);
fput(file);
out:
return error;
}
static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
{
if (sizeof ubuf->f_blocks == 4) {
if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail) &
0xffffffff00000000ULL)
return -EOVERFLOW;
/* f_files and f_ffree may be -1; it's okay
* to stuff that into 32 bits */
if (kbuf->f_files != 0xffffffffffffffffULL
&& (kbuf->f_files & 0xffffffff00000000ULL))
return -EOVERFLOW;
if (kbuf->f_ffree != 0xffffffffffffffffULL
&& (kbuf->f_ffree & 0xffffffff00000000ULL))
return -EOVERFLOW;
}
if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
__put_user(kbuf->f_type, &ubuf->f_type) ||
__put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
__put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
__put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
__put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
__put_user(kbuf->f_files, &ubuf->f_files) ||
__put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
__put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
__put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
__put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
__put_user(kbuf->f_frsize, &ubuf->f_frsize))
return -EFAULT;
return 0;
}
asmlinkage long compat_sys_statfs64(const char __user *path, compat_size_t sz, struct compat_statfs64 __user *buf)
{
struct nameidata nd;
int error;
if (sz != sizeof(*buf))
return -EINVAL;
error = user_path_walk(path, &nd);
if (!error) {
struct kstatfs tmp;
error = vfs_statfs(nd.dentry->d_inode->i_sb, &tmp);
if (!error)
error = put_compat_statfs64(buf, &tmp);
path_release(&nd);
}
return error;
}
asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
{
struct file * file;
struct kstatfs tmp;
int error;
if (sz != sizeof(*buf))
return -EINVAL;
error = -EBADF;
file = fget(fd);
if (!file)
goto out;
error = vfs_statfs(file->f_dentry->d_inode->i_sb, &tmp);
if (!error)
error = put_compat_statfs64(buf, &tmp);
fput(file);
out:
return error;
}
/* ioctl32 stuff, used by sparc64, parisc, s390x, ppc64, x86_64, MIPS */
#define IOCTL_HASHSIZE 256
static struct ioctl_trans *ioctl32_hash_table[IOCTL_HASHSIZE];
extern struct ioctl_trans ioctl_start[];
extern int ioctl_table_size;
static inline unsigned long ioctl32_hash(unsigned long cmd)
{
return (((cmd >> 6) ^ (cmd >> 4) ^ cmd)) % IOCTL_HASHSIZE;
}
static void ioctl32_insert_translation(struct ioctl_trans *trans)
{
unsigned long hash;
struct ioctl_trans *t;
hash = ioctl32_hash (trans->cmd);
if (!ioctl32_hash_table[hash])
ioctl32_hash_table[hash] = trans;
else {
t = ioctl32_hash_table[hash];
while (t->next)
t = t->next;
trans->next = NULL;
t->next = trans;
}
}
static int __init init_sys32_ioctl(void)
{
int i;
for (i = 0; i < ioctl_table_size; i++) {
if (ioctl_start[i].next != 0) {
printk("ioctl translation %d bad\n",i);
return -1;
}
ioctl32_insert_translation(&ioctl_start[i]);
}
return 0;
}
__initcall(init_sys32_ioctl);
static void compat_ioctl_error(struct file *filp, unsigned int fd,
unsigned int cmd, unsigned long arg)
{
char buf[10];
char *fn = "?";
char *path;
/* find the name of the device. */
path = (char *)__get_free_page(GFP_KERNEL);
if (path) {
fn = d_path(filp->f_dentry, filp->f_vfsmnt, path, PAGE_SIZE);
if (IS_ERR(fn))
fn = "?";
}
sprintf(buf,"'%c'", (cmd>>24) & 0x3f);
if (!isprint(buf[1]))
sprintf(buf, "%02x", buf[1]);
printk("ioctl32(%s:%d): Unknown cmd fd(%d) "
"cmd(%08x){%s} arg(%08x) on %s\n",
current->comm, current->pid,
(int)fd, (unsigned int)cmd, buf,
(unsigned int)arg, fn);
if (path)
free_page((unsigned long)path);
}
asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
unsigned long arg)
{
struct file *filp;
int error = -EBADF;
struct ioctl_trans *t;
int fput_needed;
filp = fget_light(fd, &fput_needed);
if (!filp)
goto out;
/* RED-PEN how should LSM module know it's handling 32bit? */
error = security_file_ioctl(filp, cmd, arg);
if (error)
goto out_fput;
/*
* To allow the compat_ioctl handlers to be self contained
* we need to check the common ioctls here first.
* Just handle them with the standard handlers below.
*/
switch (cmd) {
case FIOCLEX:
case FIONCLEX:
case FIONBIO:
case FIOASYNC:
case FIOQSIZE:
break;
case FIBMAP:
case FIGETBSZ:
case FIONREAD:
if (S_ISREG(filp->f_dentry->d_inode->i_mode))
break;
/*FALL THROUGH*/
default:
if (filp->f_op && filp->f_op->compat_ioctl) {
error = filp->f_op->compat_ioctl(filp, cmd, arg);
if (error != -ENOIOCTLCMD)
goto out_fput;
}
if (!filp->f_op ||
(!filp->f_op->ioctl && !filp->f_op->unlocked_ioctl))
goto do_ioctl;
break;
}
for (t = ioctl32_hash_table[ioctl32_hash(cmd)]; t; t = t->next) {
if (t->cmd == cmd)
goto found_handler;
}
if (S_ISSOCK(filp->f_dentry->d_inode->i_mode) &&
cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
error = siocdevprivate_ioctl(fd, cmd, arg);
} else {
static int count;
if (++count <= 50)
compat_ioctl_error(filp, fd, cmd, arg);
error = -EINVAL;
}
goto out_fput;
found_handler:
if (t->handler) {
lock_kernel();
error = t->handler(fd, cmd, arg, filp);
unlock_kernel();
goto out_fput;
}
do_ioctl:
error = vfs_ioctl(filp, fd, cmd, arg);
out_fput:
fput_light(filp, fput_needed);
out:
return error;
}
static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
{
if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
__get_user(kfl->l_type, &ufl->l_type) ||
__get_user(kfl->l_whence, &ufl->l_whence) ||
__get_user(kfl->l_start, &ufl->l_start) ||
__get_user(kfl->l_len, &ufl->l_len) ||
__get_user(kfl->l_pid, &ufl->l_pid))
return -EFAULT;
return 0;
}
static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
{
if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
__put_user(kfl->l_type, &ufl->l_type) ||
__put_user(kfl->l_whence, &ufl->l_whence) ||
__put_user(kfl->l_start, &ufl->l_start) ||
__put_user(kfl->l_len, &ufl->l_len) ||
__put_user(kfl->l_pid, &ufl->l_pid))
return -EFAULT;
return 0;
}
#ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
{
if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
__get_user(kfl->l_type, &ufl->l_type) ||
__get_user(kfl->l_whence, &ufl->l_whence) ||
__get_user(kfl->l_start, &ufl->l_start) ||
__get_user(kfl->l_len, &ufl->l_len) ||
__get_user(kfl->l_pid, &ufl->l_pid))
return -EFAULT;
return 0;
}
#endif
#ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
{
if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
__put_user(kfl->l_type, &ufl->l_type) ||
__put_user(kfl->l_whence, &ufl->l_whence) ||
__put_user(kfl->l_start, &ufl->l_start) ||
__put_user(kfl->l_len, &ufl->l_len) ||
__put_user(kfl->l_pid, &ufl->l_pid))
return -EFAULT;
return 0;
}
#endif
asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
unsigned long arg)
{
mm_segment_t old_fs;
struct flock f;
long ret;
switch (cmd) {
case F_GETLK:
case F_SETLK:
case F_SETLKW:
ret = get_compat_flock(&f, compat_ptr(arg));
if (ret != 0)
break;
old_fs = get_fs();
set_fs(KERNEL_DS);
ret = sys_fcntl(fd, cmd, (unsigned long)&f);
set_fs(old_fs);
if (cmd == F_GETLK && ret == 0) {
/* GETLK was successfule and we need to return the data...
* but it needs to fit in the compat structure.
* l_start shouldn't be too big, unless the original
* start + end is greater than COMPAT_OFF_T_MAX, in which
* case the app was asking for trouble, so we return
* -EOVERFLOW in that case.
* l_len could be too big, in which case we just truncate it,
* and only allow the app to see that part of the conflicting
* lock that might make sense to it anyway
*/
if (f.l_start > COMPAT_OFF_T_MAX)
ret = -EOVERFLOW;
if (f.l_len > COMPAT_OFF_T_MAX)
f.l_len = COMPAT_OFF_T_MAX;
if (ret == 0)
ret = put_compat_flock(&f, compat_ptr(arg));
}
break;
case F_GETLK64:
case F_SETLK64:
case F_SETLKW64:
ret = get_compat_flock64(&f, compat_ptr(arg));
if (ret != 0)
break;
old_fs = get_fs();
set_fs(KERNEL_DS);
ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
(unsigned long)&f);
set_fs(old_fs);
if (cmd == F_GETLK64 && ret == 0) {
/* need to return lock information - see above for commentary */
if (f.l_start > COMPAT_LOFF_T_MAX)
ret = -EOVERFLOW;
if (f.l_len > COMPAT_LOFF_T_MAX)
f.l_len = COMPAT_LOFF_T_MAX;
if (ret == 0)
ret = put_compat_flock64(&f, compat_ptr(arg));
}
break;
default:
ret = sys_fcntl(fd, cmd, arg);
break;
}
return ret;
}
asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
unsigned long arg)
{
if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
return -EINVAL;
return compat_sys_fcntl64(fd, cmd, arg);
}
asmlinkage long
compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
{
long ret;
aio_context_t ctx64;
mm_segment_t oldfs = get_fs();
if (unlikely(get_user(ctx64, ctx32p)))
return -EFAULT;
set_fs(KERNEL_DS);
/* The __user pointer cast is valid because of the set_fs() */
ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
set_fs(oldfs);
/* truncating is ok because it's a user address */
if (!ret)
ret = put_user((u32) ctx64, ctx32p);
return ret;
}
asmlinkage long
compat_sys_io_getevents(aio_context_t ctx_id,
unsigned long min_nr,
unsigned long nr,
struct io_event __user *events,
struct compat_timespec __user *timeout)
{
long ret;
struct timespec t;
struct timespec __user *ut = NULL;
ret = -EFAULT;
if (unlikely(!access_ok(VERIFY_WRITE, events,
nr * sizeof(struct io_event))))
goto out;
if (timeout) {
if (get_compat_timespec(&t, timeout))
goto out;
ut = compat_alloc_user_space(sizeof(*ut));
if (copy_to_user(ut, &t, sizeof(t)) )
goto out;
}
ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
out:
return ret;
}
static inline long
copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
{
compat_uptr_t uptr;
int i;
for (i = 0; i < nr; ++i) {
if (get_user(uptr, ptr32 + i))
return -EFAULT;
if (put_user(compat_ptr(uptr), ptr64 + i))
return -EFAULT;
}
return 0;
}
#define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
asmlinkage long
compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
{
struct iocb __user * __user *iocb64;
long ret;
if (unlikely(nr < 0))
return -EINVAL;
if (nr > MAX_AIO_SUBMITS)
nr = MAX_AIO_SUBMITS;
iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
ret = copy_iocb(nr, iocb, iocb64);
if (!ret)
ret = sys_io_submit(ctx_id, nr, iocb64);
return ret;
}
struct compat_ncp_mount_data {
compat_int_t version;
compat_uint_t ncp_fd;
__compat_uid_t mounted_uid;
compat_pid_t wdog_pid;
unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
compat_uint_t time_out;
compat_uint_t retry_count;
compat_uint_t flags;
__compat_uid_t uid;
__compat_gid_t gid;
compat_mode_t file_mode;
compat_mode_t dir_mode;
};
struct compat_ncp_mount_data_v4 {
compat_int_t version;
compat_ulong_t flags;
compat_ulong_t mounted_uid;
compat_long_t wdog_pid;
compat_uint_t ncp_fd;
compat_uint_t time_out;
compat_uint_t retry_count;
compat_ulong_t uid;
compat_ulong_t gid;
compat_ulong_t file_mode;
compat_ulong_t dir_mode;
};
static void *do_ncp_super_data_conv(void *raw_data)
{
int version = *(unsigned int *)raw_data;
if (version == 3) {
struct compat_ncp_mount_data *c_n = raw_data;
struct ncp_mount_data *n = raw_data;
n->dir_mode = c_n->dir_mode;
n->file_mode = c_n->file_mode;
n->gid = c_n->gid;
n->uid = c_n->uid;
memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
n->wdog_pid = c_n->wdog_pid;
n->mounted_uid = c_n->mounted_uid;
} else if (version == 4) {
struct compat_ncp_mount_data_v4 *c_n = raw_data;
struct ncp_mount_data_v4 *n = raw_data;
n->dir_mode = c_n->dir_mode;
n->file_mode = c_n->file_mode;
n->gid = c_n->gid;
n->uid = c_n->uid;
n->retry_count = c_n->retry_count;
n->time_out = c_n->time_out;
n->ncp_fd = c_n->ncp_fd;
n->wdog_pid = c_n->wdog_pid;
n->mounted_uid = c_n->mounted_uid;
n->flags = c_n->flags;
} else if (version != 5) {
return NULL;
}
return raw_data;
}
struct compat_smb_mount_data {
compat_int_t version;
__compat_uid_t mounted_uid;
__compat_uid_t uid;
__compat_gid_t gid;
compat_mode_t file_mode;
compat_mode_t dir_mode;
};
static void *do_smb_super_data_conv(void *raw_data)
{
struct smb_mount_data *s = raw_data;
struct compat_smb_mount_data *c_s = raw_data;
if (c_s->version != SMB_MOUNT_OLDVERSION)
goto out;
s->dir_mode = c_s->dir_mode;
s->file_mode = c_s->file_mode;
s->gid = c_s->gid;
s->uid = c_s->uid;
s->mounted_uid = c_s->mounted_uid;
out:
return raw_data;
}
struct compat_nfs_string {
compat_uint_t len;
compat_uptr_t data;
};
static inline void compat_nfs_string(struct nfs_string *dst,
struct compat_nfs_string *src)
{
dst->data = compat_ptr(src->data);
dst->len = src->len;
}
struct compat_nfs4_mount_data_v1 {
compat_int_t version;
compat_int_t flags;
compat_int_t rsize;
compat_int_t wsize;
compat_int_t timeo;
compat_int_t retrans;
compat_int_t acregmin;
compat_int_t acregmax;
compat_int_t acdirmin;
compat_int_t acdirmax;
struct compat_nfs_string client_addr;
struct compat_nfs_string mnt_path;
struct compat_nfs_string hostname;
compat_uint_t host_addrlen;
compat_uptr_t host_addr;
compat_int_t proto;
compat_int_t auth_flavourlen;
compat_uptr_t auth_flavours;
};
static int do_nfs4_super_data_conv(void *raw_data)
{
int version = *(compat_uint_t *) raw_data;
if (version == 1) {
struct compat_nfs4_mount_data_v1 *raw = raw_data;
struct nfs4_mount_data *real = raw_data;
/* copy the fields backwards */
real->auth_flavours = compat_ptr(raw->auth_flavours);
real->auth_flavourlen = raw->auth_flavourlen;
real->proto = raw->proto;
real->host_addr = compat_ptr(raw->host_addr);
real->host_addrlen = raw->host_addrlen;
compat_nfs_string(&real->hostname, &raw->hostname);
compat_nfs_string(&real->mnt_path, &raw->mnt_path);
compat_nfs_string(&real->client_addr, &raw->client_addr);
real->acdirmax = raw->acdirmax;
real->acdirmin = raw->acdirmin;
real->acregmax = raw->acregmax;
real->acregmin = raw->acregmin;
real->retrans = raw->retrans;
real->timeo = raw->timeo;
real->wsize = raw->wsize;
real->rsize = raw->rsize;
real->flags = raw->flags;
real->version = raw->version;
}
else {
return -EINVAL;
}
return 0;
}
extern int copy_mount_options (const void __user *, unsigned long *);
#define SMBFS_NAME "smbfs"
#define NCPFS_NAME "ncpfs"
#define NFS4_NAME "nfs4"
asmlinkage long compat_sys_mount(char __user * dev_name, char __user * dir_name,
char __user * type, unsigned long flags,
void __user * data)
{
unsigned long type_page;
unsigned long data_page;
unsigned long dev_page;
char *dir_page;
int retval;
retval = copy_mount_options (type, &type_page);
if (retval < 0)
goto out;
dir_page = getname(dir_name);
retval = PTR_ERR(dir_page);
if (IS_ERR(dir_page))
goto out1;
retval = copy_mount_options (dev_name, &dev_page);
if (retval < 0)
goto out2;
retval = copy_mount_options (data, &data_page);
if (retval < 0)
goto out3;
retval = -EINVAL;
if (type_page) {
if (!strcmp((char *)type_page, SMBFS_NAME)) {
do_smb_super_data_conv((void *)data_page);
} else if (!strcmp((char *)type_page, NCPFS_NAME)) {
do_ncp_super_data_conv((void *)data_page);
} else if (!strcmp((char *)type_page, NFS4_NAME)) {
if (do_nfs4_super_data_conv((void *) data_page))
goto out4;
}
}
lock_kernel();
retval = do_mount((char*)dev_page, dir_page, (char*)type_page,
flags, (void*)data_page);
unlock_kernel();
out4:
free_page(data_page);
out3:
free_page(dev_page);
out2:
putname(dir_page);
out1:
free_page(type_page);
out:
return retval;
}
#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
#define COMPAT_ROUND_UP(x) (((x)+sizeof(compat_long_t)-1) & \
~(sizeof(compat_long_t)-1))
struct compat_old_linux_dirent {
compat_ulong_t d_ino;
compat_ulong_t d_offset;
unsigned short d_namlen;
char d_name[1];
};
struct compat_readdir_callback {
struct compat_old_linux_dirent __user *dirent;
int result;
};
static int compat_fillonedir(void *__buf, const char *name, int namlen,
loff_t offset, ino_t ino, unsigned int d_type)
{
struct compat_readdir_callback *buf = __buf;
struct compat_old_linux_dirent __user *dirent;
if (buf->result)
return -EINVAL;
buf->result++;
dirent = buf->dirent;
if (!access_ok(VERIFY_WRITE, dirent,
(unsigned long)(dirent->d_name + namlen + 1) -
(unsigned long)dirent))
goto efault;
if ( __put_user(ino, &dirent->d_ino) ||
__put_user(offset, &dirent->d_offset) ||
__put_user(namlen, &dirent->d_namlen) ||
__copy_to_user(dirent->d_name, name, namlen) ||
__put_user(0, dirent->d_name + namlen))
goto efault;
return 0;
efault:
buf->result = -EFAULT;
return -EFAULT;
}
asmlinkage long compat_sys_old_readdir(unsigned int fd,
struct compat_old_linux_dirent __user *dirent, unsigned int count)
{
int error;
struct file *file;
struct compat_readdir_callback buf;
error = -EBADF;
file = fget(fd);
if (!file)
goto out;
buf.result = 0;
buf.dirent = dirent;
error = vfs_readdir(file, compat_fillonedir, &buf);
if (error >= 0)
error = buf.result;
fput(file);
out:
return error;
}
struct compat_linux_dirent {
compat_ulong_t d_ino;
compat_ulong_t d_off;
unsigned short d_reclen;
char d_name[1];
};
struct compat_getdents_callback {
struct compat_linux_dirent __user *current_dir;
struct compat_linux_dirent __user *previous;
int count;
int error;
};
static int compat_filldir(void *__buf, const char *name, int namlen,
loff_t offset, ino_t ino, unsigned int d_type)
{
struct compat_linux_dirent __user * dirent;
struct compat_getdents_callback *buf = __buf;
int reclen = COMPAT_ROUND_UP(NAME_OFFSET(dirent) + namlen + 2);
buf->error = -EINVAL; /* only used if we fail.. */
if (reclen > buf->count)
return -EINVAL;
dirent = buf->previous;
if (dirent) {
if (__put_user(offset, &dirent->d_off))
goto efault;
}
dirent = buf->current_dir;
if (__put_user(ino, &dirent->d_ino))
goto efault;
if (__put_user(reclen, &dirent->d_reclen))
goto efault;
if (copy_to_user(dirent->d_name, name, namlen))
goto efault;
if (__put_user(0, dirent->d_name + namlen))
goto efault;
if (__put_user(d_type, (char __user *) dirent + reclen - 1))
goto efault;
buf->previous = dirent;
dirent = (void __user *)dirent + reclen;
buf->current_dir = dirent;
buf->count -= reclen;
return 0;
efault:
buf->error = -EFAULT;
return -EFAULT;
}
asmlinkage long compat_sys_getdents(unsigned int fd,
struct compat_linux_dirent __user *dirent, unsigned int count)
{
struct file * file;
struct compat_linux_dirent __user * lastdirent;
struct compat_getdents_callback buf;
int error;
error = -EFAULT;
if (!access_ok(VERIFY_WRITE, dirent, count))
goto out;
error = -EBADF;
file = fget(fd);
if (!file)
goto out;
buf.current_dir = dirent;
buf.previous = NULL;
buf.count = count;
buf.error = 0;
error = vfs_readdir(file, compat_filldir, &buf);
if (error < 0)
goto out_putf;
error = buf.error;
lastdirent = buf.previous;
if (lastdirent) {
if (put_user(file->f_pos, &lastdirent->d_off))
error = -EFAULT;
else
error = count - buf.count;
}
out_putf:
fput(file);
out:
return error;
}
#ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
#define COMPAT_ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1))
struct compat_getdents_callback64 {
struct linux_dirent64 __user *current_dir;
struct linux_dirent64 __user *previous;
int count;
int error;
};
static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
ino_t ino, unsigned int d_type)
{
struct linux_dirent64 __user *dirent;
struct compat_getdents_callback64 *buf = __buf;
int jj = NAME_OFFSET(dirent);
int reclen = COMPAT_ROUND_UP64(jj + namlen + 1);
u64 off;
buf->error = -EINVAL; /* only used if we fail.. */
if (reclen > buf->count)
return -EINVAL;
dirent = buf->previous;
if (dirent) {
if (__put_user_unaligned(offset, &dirent->d_off))
goto efault;
}
dirent = buf->current_dir;
if (__put_user_unaligned(ino, &dirent->d_ino))
goto efault;
off = 0;
if (__put_user_unaligned(off, &dirent->d_off))
goto efault;
if (__put_user(reclen, &dirent->d_reclen))
goto efault;
if (__put_user(d_type, &dirent->d_type))
goto efault;
if (copy_to_user(dirent->d_name, name, namlen))
goto efault;
if (__put_user(0, dirent->d_name + namlen))
goto efault;
buf->previous = dirent;
dirent = (void __user *)dirent + reclen;
buf->current_dir = dirent;
buf->count -= reclen;
return 0;
efault:
buf->error = -EFAULT;
return -EFAULT;
}
asmlinkage long compat_sys_getdents64(unsigned int fd,
struct linux_dirent64 __user * dirent, unsigned int count)
{
struct file * file;
struct linux_dirent64 __user * lastdirent;
struct compat_getdents_callback64 buf;
int error;
error = -EFAULT;
if (!access_ok(VERIFY_WRITE, dirent, count))
goto out;
error = -EBADF;
file = fget(fd);
if (!file)
goto out;
buf.current_dir = dirent;
buf.previous = NULL;
buf.count = count;
buf.error = 0;
error = vfs_readdir(file, compat_filldir64, &buf);
if (error < 0)
goto out_putf;
error = buf.error;
lastdirent = buf.previous;
if (lastdirent) {
typeof(lastdirent->d_off) d_off = file->f_pos;
__put_user_unaligned(d_off, &lastdirent->d_off);
error = count - buf.count;
}
out_putf:
fput(file);
out:
return error;
}
#endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
static ssize_t compat_do_readv_writev(int type, struct file *file,
const struct compat_iovec __user *uvector,
unsigned long nr_segs, loff_t *pos)
{
typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *);
typedef ssize_t (*iov_fn_t)(struct file *, const struct iovec *, unsigned long, loff_t *);
compat_ssize_t tot_len;
struct iovec iovstack[UIO_FASTIOV];
struct iovec *iov=iovstack, *vector;
ssize_t ret;
int seg;
io_fn_t fn;
iov_fn_t fnv;
/*
* SuS says "The readv() function *may* fail if the iovcnt argument
* was less than or equal to 0, or greater than {IOV_MAX}. Linux has
* traditionally returned zero for zero segments, so...
*/
ret = 0;
if (nr_segs == 0)
goto out;
/*
* First get the "struct iovec" from user memory and
* verify all the pointers
*/
ret = -EINVAL;
if ((nr_segs > UIO_MAXIOV) || (nr_segs <= 0))
goto out;
if (!file->f_op)
goto out;
if (nr_segs > UIO_FASTIOV) {
ret = -ENOMEM;
iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
if (!iov)
goto out;
}
ret = -EFAULT;
if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
goto out;
/*
* Single unix specification:
* We should -EINVAL if an element length is not >= 0 and fitting an
* ssize_t. The total length is fitting an ssize_t
*
* Be careful here because iov_len is a size_t not an ssize_t
*/
tot_len = 0;
vector = iov;
ret = -EINVAL;
for (seg = 0 ; seg < nr_segs; seg++) {
compat_ssize_t tmp = tot_len;
compat_ssize_t len;
compat_uptr_t buf;
if (__get_user(len, &uvector->iov_len) ||
__get_user(buf, &uvector->iov_base)) {
ret = -EFAULT;
goto out;
}
if (len < 0) /* size_t not fitting an compat_ssize_t .. */
goto out;
tot_len += len;
if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
goto out;
vector->iov_base = compat_ptr(buf);
vector->iov_len = (compat_size_t) len;
uvector++;
vector++;
}
if (tot_len == 0) {
ret = 0;
goto out;
}
ret = rw_verify_area(type, file, pos, tot_len);
if (ret < 0)
goto out;
ret = security_file_permission(file, type == READ ? MAY_READ:MAY_WRITE);
if (ret)
goto out;
fnv = NULL;
if (type == READ) {
fn = file->f_op->read;
fnv = file->f_op->readv;
} else {
fn = (io_fn_t)file->f_op->write;
fnv = file->f_op->writev;
}
if (fnv) {
ret = fnv(file, iov, nr_segs, pos);
goto out;
}
/* Do it by hand, with file-ops */
ret = 0;
vector = iov;
while (nr_segs > 0) {
void __user * base;
size_t len;
ssize_t nr;
base = vector->iov_base;
len = vector->iov_len;
vector++;
nr_segs--;
nr = fn(file, base, len, pos);
if (nr < 0) {
if (!ret) ret = nr;
break;
}
ret += nr;
if (nr != len)
break;
}
out:
if (iov != iovstack)
kfree(iov);
if ((ret + (type == READ)) > 0) {
struct dentry *dentry = file->f_dentry;
if (type == READ)
fsnotify_access(dentry);
else
fsnotify_modify(dentry);
}
return ret;
}
asmlinkage ssize_t
compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
{
struct file *file;
ssize_t ret = -EBADF;
file = fget(fd);
if (!file)
return -EBADF;
if (!(file->f_mode & FMODE_READ))
goto out;
ret = -EINVAL;
if (!file->f_op || (!file->f_op->readv && !file->f_op->read))
goto out;
ret = compat_do_readv_writev(READ, file, vec, vlen, &file->f_pos);
out:
fput(file);
return ret;
}
asmlinkage ssize_t
compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec, unsigned long vlen)
{
struct file *file;
ssize_t ret = -EBADF;
file = fget(fd);
if (!file)
return -EBADF;
if (!(file->f_mode & FMODE_WRITE))
goto out;
ret = -EINVAL;
if (!file->f_op || (!file->f_op->writev && !file->f_op->write))
goto out;
ret = compat_do_readv_writev(WRITE, file, vec, vlen, &file->f_pos);
out:
fput(file);
return ret;
}
asmlinkage long
compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
unsigned int nr_segs, unsigned int flags)
{
unsigned i;
struct iovec *iov;
if (nr_segs > UIO_MAXIOV)
return -EINVAL;
iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
for (i = 0; i < nr_segs; i++) {
struct compat_iovec v;
if (get_user(v.iov_base, &iov32[i].iov_base) ||
get_user(v.iov_len, &iov32[i].iov_len) ||
put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
put_user(v.iov_len, &iov[i].iov_len))
return -EFAULT;
}
return sys_vmsplice(fd, iov, nr_segs, flags);
}
/*
* Exactly like fs/open.c:sys_open(), except that it doesn't set the
* O_LARGEFILE flag.
*/
asmlinkage long
compat_sys_open(const char __user *filename, int flags, int mode)
{
return do_sys_open(AT_FDCWD, filename, flags, mode);
}
/*
* Exactly like fs/open.c:sys_openat(), except that it doesn't set the
* O_LARGEFILE flag.
*/
asmlinkage long
compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
{
return do_sys_open(dfd, filename, flags, mode);
}
/*
* compat_count() counts the number of arguments/envelopes. It is basically
* a copy of count() from fs/exec.c, except that it works with 32 bit argv
* and envp pointers.
*/
static int compat_count(compat_uptr_t __user *argv, int max)
{
int i = 0;
if (argv != NULL) {
for (;;) {
compat_uptr_t p;
if (get_user(p, argv))
return -EFAULT;
if (!p)
break;
argv++;
if(++i > max)
return -E2BIG;
}
}
return i;
}
/*
* compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
* except that it works with 32 bit argv and envp pointers.
*/
static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
struct linux_binprm *bprm)
{
struct page *kmapped_page = NULL;
char *kaddr = NULL;
int ret;
while (argc-- > 0) {
compat_uptr_t str;
int len;
unsigned long pos;
if (get_user(str, argv+argc) ||
!(len = strnlen_user(compat_ptr(str), bprm->p))) {
ret = -EFAULT;
goto out;
}
if (bprm->p < len) {
ret = -E2BIG;
goto out;
}
bprm->p -= len;
/* XXX: add architecture specific overflow check here. */
pos = bprm->p;
while (len > 0) {
int i, new, err;
int offset, bytes_to_copy;
struct page *page;
offset = pos % PAGE_SIZE;
i = pos/PAGE_SIZE;
page = bprm->page[i];
new = 0;
if (!page) {
page = alloc_page(GFP_HIGHUSER);
bprm->page[i] = page;
if (!page) {
ret = -ENOMEM;
goto out;
}
new = 1;
}
if (page != kmapped_page) {
if (kmapped_page)
kunmap(kmapped_page);
kmapped_page = page;
kaddr = kmap(kmapped_page);
}
if (new && offset)
memset(kaddr, 0, offset);
bytes_to_copy = PAGE_SIZE - offset;
if (bytes_to_copy > len) {
bytes_to_copy = len;
if (new)
memset(kaddr+offset+len, 0,
PAGE_SIZE-offset-len);
}
err = copy_from_user(kaddr+offset, compat_ptr(str),
bytes_to_copy);
if (err) {
ret = -EFAULT;
goto out;
}
pos += bytes_to_copy;
str += bytes_to_copy;
len -= bytes_to_copy;
}
}
ret = 0;
out:
if (kmapped_page)
kunmap(kmapped_page);
return ret;
}
#ifdef CONFIG_MMU
#define free_arg_pages(bprm) do { } while (0)
#else
static inline void free_arg_pages(struct linux_binprm *bprm)
{
int i;
for (i = 0; i < MAX_ARG_PAGES; i++) {
if (bprm->page[i])
__free_page(bprm->page[i]);
bprm->page[i] = NULL;
}
}
#endif /* CONFIG_MMU */
/*
* compat_do_execve() is mostly a copy of do_execve(), with the exception
* that it processes 32 bit argv and envp pointers.
*/
int compat_do_execve(char * filename,
compat_uptr_t __user *argv,
compat_uptr_t __user *envp,
struct pt_regs * regs)
{
struct linux_binprm *bprm;
struct file *file;
int retval;
int i;
retval = -ENOMEM;
bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
if (!bprm)
goto out_ret;
file = open_exec(filename);
retval = PTR_ERR(file);
if (IS_ERR(file))
goto out_kfree;
sched_exec();
bprm->p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *);
bprm->file = file;
bprm->filename = filename;
bprm->interp = filename;
bprm->mm = mm_alloc();
retval = -ENOMEM;
if (!bprm->mm)
goto out_file;
retval = init_new_context(current, bprm->mm);
if (retval < 0)
goto out_mm;
bprm->argc = compat_count(argv, bprm->p / sizeof(compat_uptr_t));
if ((retval = bprm->argc) < 0)
goto out_mm;
bprm->envc = compat_count(envp, bprm->p / sizeof(compat_uptr_t));
if ((retval = bprm->envc) < 0)
goto out_mm;
retval = security_bprm_alloc(bprm);
if (retval)
goto out;
retval = prepare_binprm(bprm);
if (retval < 0)
goto out;
retval = copy_strings_kernel(1, &bprm->filename, bprm);
if (retval < 0)
goto out;
bprm->exec = bprm->p;
retval = compat_copy_strings(bprm->envc, envp, bprm);
if (retval < 0)
goto out;
retval = compat_copy_strings(bprm->argc, argv, bprm);
if (retval < 0)
goto out;
retval = search_binary_handler(bprm, regs);
if (retval >= 0) {
free_arg_pages(bprm);
/* execve success */
security_bprm_free(bprm);
acct_update_integrals(current);
kfree(bprm);
return retval;
}
out:
/* Something went wrong, return the inode and free the argument pages*/
for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
struct page * page = bprm->page[i];
if (page)
__free_page(page);
}
if (bprm->security)
security_bprm_free(bprm);
out_mm:
if (bprm->mm)
mmdrop(bprm->mm);
out_file:
if (bprm->file) {
allow_write_access(bprm->file);
fput(bprm->file);
}
out_kfree:
kfree(bprm);
out_ret:
return retval;
}
#define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
/*
* Ooo, nasty. We need here to frob 32-bit unsigned longs to
* 64-bit unsigned longs.
*/
static
int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
unsigned long *fdset)
{
nr = ROUND_UP(nr, __COMPAT_NFDBITS);
if (ufdset) {
unsigned long odd;
if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
return -EFAULT;
odd = nr & 1UL;
nr &= ~1UL;
while (nr) {
unsigned long h, l;
__get_user(l, ufdset);
__get_user(h, ufdset+1);
ufdset += 2;
*fdset++ = h << 32 | l;
nr -= 2;
}
if (odd)
__get_user(*fdset, ufdset);
} else {
/* Tricky, must clear full unsigned long in the
* kernel fdset at the end, this makes sure that
* actually happens.
*/
memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
}
return 0;
}
static
void compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
unsigned long *fdset)
{
unsigned long odd;
nr = ROUND_UP(nr, __COMPAT_NFDBITS);
if (!ufdset)
return;
odd = nr & 1UL;
nr &= ~1UL;
while (nr) {
unsigned long h, l;
l = *fdset++;
h = l >> 32;
__put_user(l, ufdset);
__put_user(h, ufdset+1);
ufdset += 2;
nr -= 2;
}
if (odd)
__put_user(*fdset, ufdset);
}
/*
* This is a virtual copy of sys_select from fs/select.c and probably
* should be compared to it from time to time
*/
/*
* We can actually return ERESTARTSYS instead of EINTR, but I'd
* like to be certain this leads to no problems. So I return
* EINTR just for safety.
*
* Update: ERESTARTSYS breaks at least the xview clock binary, so
* I'm trying ERESTARTNOHAND which restart only when you want to.
*/
#define MAX_SELECT_SECONDS \
((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
int compat_core_sys_select(int n, compat_ulong_t __user *inp,
compat_ulong_t __user *outp, compat_ulong_t __user *exp, s64 *timeout)
{
fd_set_bits fds;
char *bits;
int size, max_fdset, ret = -EINVAL;
struct fdtable *fdt;
if (n < 0)
goto out_nofds;
/* max_fdset can increase, so grab it once to avoid race */
rcu_read_lock();
fdt = files_fdtable(current->files);
max_fdset = fdt->max_fdset;
rcu_read_unlock();
if (n > max_fdset)
n = max_fdset;
/*
* We need 6 bitmaps (in/out/ex for both incoming and outgoing),
* since we used fdset we need to allocate memory in units of
* long-words.
*/
ret = -ENOMEM;
size = FDS_BYTES(n);
bits = kmalloc(6 * size, GFP_KERNEL);
if (!bits)
goto out_nofds;
fds.in = (unsigned long *) bits;
fds.out = (unsigned long *) (bits + size);
fds.ex = (unsigned long *) (bits + 2*size);
fds.res_in = (unsigned long *) (bits + 3*size);
fds.res_out = (unsigned long *) (bits + 4*size);
fds.res_ex = (unsigned long *) (bits + 5*size);
if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
(ret = compat_get_fd_set(n, outp, fds.out)) ||
(ret = compat_get_fd_set(n, exp, fds.ex)))
goto out;
zero_fd_set(n, fds.res_in);
zero_fd_set(n, fds.res_out);
zero_fd_set(n, fds.res_ex);
ret = do_select(n, &fds, timeout);
if (ret < 0)
goto out;
if (!ret) {
ret = -ERESTARTNOHAND;
if (signal_pending(current))
goto out;
ret = 0;
}
compat_set_fd_set(n, inp, fds.res_in);
compat_set_fd_set(n, outp, fds.res_out);
compat_set_fd_set(n, exp, fds.res_ex);
out:
kfree(bits);
out_nofds:
return ret;
}
asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
compat_ulong_t __user *outp, compat_ulong_t __user *exp,
struct compat_timeval __user *tvp)
{
s64 timeout = -1;
struct compat_timeval tv;
int ret;
if (tvp) {
if (copy_from_user(&tv, tvp, sizeof(tv)))
return -EFAULT;
if (tv.tv_sec < 0 || tv.tv_usec < 0)
return -EINVAL;
/* Cast to u64 to make GCC stop complaining */
if ((u64)tv.tv_sec >= (u64)MAX_INT64_SECONDS)
timeout = -1; /* infinite */
else {
timeout = ROUND_UP(tv.tv_usec, 1000000/HZ);
timeout += tv.tv_sec * HZ;
}
}
ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
if (tvp) {
struct compat_timeval rtv;
if (current->personality & STICKY_TIMEOUTS)
goto sticky;
rtv.tv_usec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ));
rtv.tv_sec = timeout;
if (compat_timeval_compare(&rtv, &tv) >= 0)
rtv = tv;
if (copy_to_user(tvp, &rtv, sizeof(rtv))) {
sticky:
/*
* If an application puts its timeval in read-only
* memory, we don't want the Linux-specific update to
* the timeval to cause a fault after the select has
* completed successfully. However, because we're not
* updating the timeval, we can't restart the system
* call.
*/
if (ret == -ERESTARTNOHAND)
ret = -EINTR;
}
}
return ret;
}
#ifdef TIF_RESTORE_SIGMASK
asmlinkage long compat_sys_pselect7(int n, compat_ulong_t __user *inp,
compat_ulong_t __user *outp, compat_ulong_t __user *exp,
struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
compat_size_t sigsetsize)
{
compat_sigset_t ss32;
sigset_t ksigmask, sigsaved;
s64 timeout = MAX_SCHEDULE_TIMEOUT;
struct compat_timespec ts;
int ret;
if (tsp) {
if (copy_from_user(&ts, tsp, sizeof(ts)))
return -EFAULT;
if (ts.tv_sec < 0 || ts.tv_nsec < 0)
return -EINVAL;
}
if (sigmask) {
if (sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
return -EFAULT;
sigset_from_compat(&ksigmask, &ss32);
sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
do {
if (tsp) {
if ((unsigned long)ts.tv_sec < MAX_SELECT_SECONDS) {
timeout = ROUND_UP(ts.tv_nsec, 1000000000/HZ);
timeout += ts.tv_sec * (unsigned long)HZ;
ts.tv_sec = 0;
ts.tv_nsec = 0;
} else {
ts.tv_sec -= MAX_SELECT_SECONDS;
timeout = MAX_SELECT_SECONDS * HZ;
}
}
ret = compat_core_sys_select(n, inp, outp, exp, &timeout);
} while (!ret && !timeout && tsp && (ts.tv_sec || ts.tv_nsec));
if (tsp && !(current->personality & STICKY_TIMEOUTS)) {
struct compat_timespec rts;
rts.tv_sec = timeout / HZ;
rts.tv_nsec = (timeout % HZ) * (NSEC_PER_SEC/HZ);
if (rts.tv_nsec >= NSEC_PER_SEC) {
rts.tv_sec++;
rts.tv_nsec -= NSEC_PER_SEC;
}
if (compat_timespec_compare(&rts, &ts) >= 0)
rts = ts;
copy_to_user(tsp, &rts, sizeof(rts));
}
if (ret == -ERESTARTNOHAND) {
/*
* Don't restore the signal mask yet. Let do_signal() deliver
* the signal on the way back to userspace, before the signal
* mask is restored.
*/
if (sigmask) {
memcpy(&current->saved_sigmask, &sigsaved,
sizeof(sigsaved));
set_thread_flag(TIF_RESTORE_SIGMASK);
}
} else if (sigmask)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
return ret;
}
asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
compat_ulong_t __user *outp, compat_ulong_t __user *exp,
struct compat_timespec __user *tsp, void __user *sig)
{
compat_size_t sigsetsize = 0;
compat_uptr_t up = 0;
if (sig) {
if (!access_ok(VERIFY_READ, sig,
sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
__get_user(up, (compat_uptr_t __user *)sig) ||
__get_user(sigsetsize,
(compat_size_t __user *)(sig+sizeof(up))))
return -EFAULT;
}
return compat_sys_pselect7(n, inp, outp, exp, tsp, compat_ptr(up),
sigsetsize);
}
asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
unsigned int nfds, struct compat_timespec __user *tsp,
const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
{
compat_sigset_t ss32;
sigset_t ksigmask, sigsaved;
struct compat_timespec ts;
s64 timeout = -1;
int ret;
if (tsp) {
if (copy_from_user(&ts, tsp, sizeof(ts)))
return -EFAULT;
/* We assume that ts.tv_sec is always lower than
the number of seconds that can be expressed in
an s64. Otherwise the compiler bitches at us */
timeout = ROUND_UP(ts.tv_nsec, 1000000000/HZ);
timeout += ts.tv_sec * HZ;
}
if (sigmask) {
if (sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
return -EFAULT;
sigset_from_compat(&ksigmask, &ss32);
sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
}
ret = do_sys_poll(ufds, nfds, &timeout);
/* We can restart this syscall, usually */
if (ret == -EINTR) {
/*
* Don't restore the signal mask yet. Let do_signal() deliver
* the signal on the way back to userspace, before the signal
* mask is restored.
*/
if (sigmask) {
memcpy(&current->saved_sigmask, &sigsaved,
sizeof(sigsaved));
set_thread_flag(TIF_RESTORE_SIGMASK);
}
ret = -ERESTARTNOHAND;
} else if (sigmask)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
if (tsp && timeout >= 0) {
struct compat_timespec rts;
if (current->personality & STICKY_TIMEOUTS)
goto sticky;
/* Yes, we know it's actually an s64, but it's also positive. */
rts.tv_nsec = jiffies_to_usecs(do_div((*(u64*)&timeout), HZ)) *
1000;
rts.tv_sec = timeout;
if (compat_timespec_compare(&rts, &ts) >= 0)
rts = ts;
if (copy_to_user(tsp, &rts, sizeof(rts))) {
sticky:
/*
* If an application puts its timeval in read-only
* memory, we don't want the Linux-specific update to
* the timeval to cause a fault after the select has
* completed successfully. However, because we're not
* updating the timeval, we can't restart the system
* call.
*/
if (ret == -ERESTARTNOHAND && timeout >= 0)
ret = -EINTR;
}
}
return ret;
}
#endif /* TIF_RESTORE_SIGMASK */
#if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
/* Stuff for NFS server syscalls... */
struct compat_nfsctl_svc {
u16 svc32_port;
s32 svc32_nthreads;
};
struct compat_nfsctl_client {
s8 cl32_ident[NFSCLNT_IDMAX+1];
s32 cl32_naddr;
struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
s32 cl32_fhkeytype;
s32 cl32_fhkeylen;
u8 cl32_fhkey[NFSCLNT_KEYMAX];
};
struct compat_nfsctl_export {
char ex32_client[NFSCLNT_IDMAX+1];
char ex32_path[NFS_MAXPATHLEN+1];
compat_dev_t ex32_dev;
compat_ino_t ex32_ino;
compat_int_t ex32_flags;
__compat_uid_t ex32_anon_uid;
__compat_gid_t ex32_anon_gid;
};
struct compat_nfsctl_fdparm {
struct sockaddr gd32_addr;
s8 gd32_path[NFS_MAXPATHLEN+1];
compat_int_t gd32_version;
};
struct compat_nfsctl_fsparm {
struct sockaddr gd32_addr;
s8 gd32_path[NFS_MAXPATHLEN+1];
compat_int_t gd32_maxlen;
};
struct compat_nfsctl_arg {
compat_int_t ca32_version; /* safeguard */
union {
struct compat_nfsctl_svc u32_svc;
struct compat_nfsctl_client u32_client;
struct compat_nfsctl_export u32_export;
struct compat_nfsctl_fdparm u32_getfd;
struct compat_nfsctl_fsparm u32_getfs;
} u;
#define ca32_svc u.u32_svc
#define ca32_client u.u32_client
#define ca32_export u.u32_export
#define ca32_getfd u.u32_getfd
#define ca32_getfs u.u32_getfs
};
union compat_nfsctl_res {
__u8 cr32_getfh[NFS_FHSIZE];
struct knfsd_fh cr32_getfs;
};
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)
{
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 0;
}
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 0;
}
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 0;
}
static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
struct compat_nfsctl_arg __user *arg)
{
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 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)
{
int err;
err = copy_to_user(res, kres, sizeof(*res));
return (err) ? -EFAULT : 0;
}
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;
mm_segment_t oldfs;
int err;
karg = kmalloc(sizeof(*karg), GFP_USER);
kres = kmalloc(sizeof(*kres), GFP_USER);
if(!karg || !kres) {
err = -ENOMEM;
goto done;
}
switch(cmd) {
case NFSCTL_SVC:
err = compat_nfs_svc_trans(karg, arg);
break;
case NFSCTL_ADDCLIENT:
err = compat_nfs_clnt_trans(karg, arg);
break;
case NFSCTL_DELCLIENT:
err = compat_nfs_clnt_trans(karg, arg);
break;
case NFSCTL_EXPORT:
case NFSCTL_UNEXPORT:
err = compat_nfs_exp_trans(karg, arg);
break;
case NFSCTL_GETFD:
err = compat_nfs_getfd_trans(karg, arg);
break;
case NFSCTL_GETFS:
err = compat_nfs_getfs_trans(karg, arg);
break;
default:
err = -EINVAL;
break;
}
if (err)
goto done;
oldfs = get_fs();
set_fs(KERNEL_DS);
/* The __user pointer casts are valid because of the set_fs() */
err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
set_fs(oldfs);
if (err)
goto done;
if((cmd == NFSCTL_GETFD) ||
(cmd == NFSCTL_GETFS))
err = compat_nfs_getfh_res_trans(kres, res);
done:
kfree(karg);
kfree(kres);
return err;
}
#else /* !NFSD */
long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
{
return sys_ni_syscall();
}
#endif
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