mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-03 09:00:21 +00:00
0990c0a12c
so that it returns failure instead of crashing when "m->m_len" is executed and m == NULL. The mbuf ptr can be NULL when a call to xdrmbuf_getbytes() gets the bytes it needs, but they are at the end of a short RPC reply. When this happens, xdrmbuf_getbytes() returns success, but advances the mbuf ptr (xdrs->x_private) to m_next, which is NULL. If this is followed by a call to xdrmbuf_getlong(), it calls xdrmbuf_inline(), which would cause a crash by accessing "m->m_len". Tested by: pho, serenity at exscape dot org Approved by: re (rwatson), kib (mentor)
305 lines
6.6 KiB
C
305 lines
6.6 KiB
C
/*-
|
|
* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
|
|
* Authors: Doug Rabson <dfr@rabson.org>
|
|
* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
|
|
#include <rpc/types.h>
|
|
#include <rpc/xdr.h>
|
|
|
|
static void xdrmbuf_destroy(XDR *);
|
|
static bool_t xdrmbuf_getlong(XDR *, long *);
|
|
static bool_t xdrmbuf_putlong(XDR *, const long *);
|
|
static bool_t xdrmbuf_getbytes(XDR *, char *, u_int);
|
|
static bool_t xdrmbuf_putbytes(XDR *, const char *, u_int);
|
|
/* XXX: w/64-bit pointers, u_int not enough! */
|
|
static u_int xdrmbuf_getpos(XDR *);
|
|
static bool_t xdrmbuf_setpos(XDR *, u_int);
|
|
static int32_t *xdrmbuf_inline(XDR *, u_int);
|
|
|
|
static const struct xdr_ops xdrmbuf_ops = {
|
|
xdrmbuf_getlong,
|
|
xdrmbuf_putlong,
|
|
xdrmbuf_getbytes,
|
|
xdrmbuf_putbytes,
|
|
xdrmbuf_getpos,
|
|
xdrmbuf_setpos,
|
|
xdrmbuf_inline,
|
|
xdrmbuf_destroy
|
|
};
|
|
|
|
/*
|
|
* The procedure xdrmbuf_create initializes a stream descriptor for a
|
|
* mbuf.
|
|
*/
|
|
void
|
|
xdrmbuf_create(XDR *xdrs, struct mbuf *m, enum xdr_op op)
|
|
{
|
|
|
|
KASSERT(m != NULL, ("xdrmbuf_create with NULL mbuf chain"));
|
|
xdrs->x_op = op;
|
|
xdrs->x_ops = &xdrmbuf_ops;
|
|
xdrs->x_base = (char *) m;
|
|
if (op == XDR_ENCODE) {
|
|
m = m_last(m);
|
|
xdrs->x_private = m;
|
|
xdrs->x_handy = m->m_len;
|
|
} else {
|
|
xdrs->x_private = m;
|
|
xdrs->x_handy = 0;
|
|
}
|
|
}
|
|
|
|
void
|
|
xdrmbuf_append(XDR *xdrs, struct mbuf *madd)
|
|
{
|
|
struct mbuf *m;
|
|
|
|
KASSERT(xdrs->x_ops == &xdrmbuf_ops && xdrs->x_op == XDR_ENCODE,
|
|
("xdrmbuf_append: invalid XDR stream"));
|
|
|
|
if (m_length(madd, NULL) == 0) {
|
|
m_freem(madd);
|
|
return;
|
|
}
|
|
|
|
m = (struct mbuf *) xdrs->x_private;
|
|
m->m_next = madd;
|
|
|
|
m = m_last(madd);
|
|
xdrs->x_private = m;
|
|
xdrs->x_handy = m->m_len;
|
|
}
|
|
|
|
struct mbuf *
|
|
xdrmbuf_getall(XDR *xdrs)
|
|
{
|
|
struct mbuf *m0, *m;
|
|
|
|
KASSERT(xdrs->x_ops == &xdrmbuf_ops && xdrs->x_op == XDR_DECODE,
|
|
("xdrmbuf_append: invalid XDR stream"));
|
|
|
|
m0 = (struct mbuf *) xdrs->x_base;
|
|
m = (struct mbuf *) xdrs->x_private;
|
|
if (m0 != m) {
|
|
while (m0->m_next != m)
|
|
m0 = m0->m_next;
|
|
m0->m_next = NULL;
|
|
xdrs->x_private = NULL;
|
|
} else {
|
|
xdrs->x_base = NULL;
|
|
xdrs->x_private = NULL;
|
|
}
|
|
|
|
if (m)
|
|
m_adj(m, xdrs->x_handy);
|
|
else
|
|
MGET(m, M_WAITOK, MT_DATA);
|
|
return (m);
|
|
}
|
|
|
|
static void
|
|
xdrmbuf_destroy(XDR *xdrs)
|
|
{
|
|
|
|
if (xdrs->x_op == XDR_DECODE && xdrs->x_base) {
|
|
m_freem((struct mbuf *) xdrs->x_base);
|
|
xdrs->x_base = NULL;
|
|
xdrs->x_private = NULL;
|
|
}
|
|
}
|
|
|
|
static bool_t
|
|
xdrmbuf_getlong(XDR *xdrs, long *lp)
|
|
{
|
|
int32_t *p;
|
|
int32_t t;
|
|
|
|
p = xdrmbuf_inline(xdrs, sizeof(int32_t));
|
|
if (p) {
|
|
t = *p;
|
|
} else {
|
|
xdrmbuf_getbytes(xdrs, (char *) &t, sizeof(int32_t));
|
|
}
|
|
|
|
*lp = ntohl(t);
|
|
return (TRUE);
|
|
}
|
|
|
|
static bool_t
|
|
xdrmbuf_putlong(xdrs, lp)
|
|
XDR *xdrs;
|
|
const long *lp;
|
|
{
|
|
int32_t *p;
|
|
int32_t t = htonl(*lp);
|
|
|
|
p = xdrmbuf_inline(xdrs, sizeof(int32_t));
|
|
if (p) {
|
|
*p = t;
|
|
return (TRUE);
|
|
} else {
|
|
return (xdrmbuf_putbytes(xdrs, (char *) &t, sizeof(int32_t)));
|
|
}
|
|
}
|
|
|
|
static bool_t
|
|
xdrmbuf_getbytes(XDR *xdrs, char *addr, u_int len)
|
|
{
|
|
struct mbuf *m = (struct mbuf *) xdrs->x_private;
|
|
size_t sz;
|
|
|
|
while (len > 0) {
|
|
/*
|
|
* Make sure we haven't hit the end.
|
|
*/
|
|
if (!m) {
|
|
return (FALSE);
|
|
}
|
|
|
|
/*
|
|
* See how much we can get from this mbuf.
|
|
*/
|
|
sz = m->m_len - xdrs->x_handy;
|
|
if (sz > len)
|
|
sz = len;
|
|
bcopy(mtod(m, const char *) + xdrs->x_handy, addr, sz);
|
|
|
|
addr += sz;
|
|
xdrs->x_handy += sz;
|
|
len -= sz;
|
|
|
|
if (xdrs->x_handy == m->m_len) {
|
|
m = m->m_next;
|
|
xdrs->x_private = (void *) m;
|
|
xdrs->x_handy = 0;
|
|
}
|
|
}
|
|
|
|
return (TRUE);
|
|
}
|
|
|
|
static bool_t
|
|
xdrmbuf_putbytes(XDR *xdrs, const char *addr, u_int len)
|
|
{
|
|
struct mbuf *m = (struct mbuf *) xdrs->x_private;
|
|
struct mbuf *n;
|
|
size_t sz;
|
|
|
|
while (len > 0) {
|
|
sz = M_TRAILINGSPACE(m) + (m->m_len - xdrs->x_handy);
|
|
if (sz > len)
|
|
sz = len;
|
|
bcopy(addr, mtod(m, char *) + xdrs->x_handy, sz);
|
|
addr += sz;
|
|
xdrs->x_handy += sz;
|
|
if (xdrs->x_handy > m->m_len)
|
|
m->m_len = xdrs->x_handy;
|
|
len -= sz;
|
|
|
|
if (xdrs->x_handy == m->m_len && M_TRAILINGSPACE(m) == 0) {
|
|
if (!m->m_next) {
|
|
MGET(n, M_TRYWAIT, m->m_type);
|
|
if (m->m_flags & M_EXT)
|
|
MCLGET(n, M_TRYWAIT);
|
|
m->m_next = n;
|
|
}
|
|
m = m->m_next;
|
|
xdrs->x_private = (void *) m;
|
|
xdrs->x_handy = 0;
|
|
}
|
|
}
|
|
|
|
return (TRUE);
|
|
}
|
|
|
|
static u_int
|
|
xdrmbuf_getpos(XDR *xdrs)
|
|
{
|
|
struct mbuf *m0 = (struct mbuf *) xdrs->x_base;
|
|
struct mbuf *m = (struct mbuf *) xdrs->x_private;
|
|
u_int pos = 0;
|
|
|
|
while (m0 && m0 != m) {
|
|
pos += m0->m_len;
|
|
m0 = m0->m_next;
|
|
}
|
|
KASSERT(m0, ("Corrupted mbuf chain"));
|
|
|
|
return (pos + xdrs->x_handy);
|
|
}
|
|
|
|
static bool_t
|
|
xdrmbuf_setpos(XDR *xdrs, u_int pos)
|
|
{
|
|
struct mbuf *m = (struct mbuf *) xdrs->x_base;
|
|
|
|
while (m && pos > m->m_len) {
|
|
pos -= m->m_len;
|
|
m = m->m_next;
|
|
}
|
|
KASSERT(m, ("Corrupted mbuf chain"));
|
|
|
|
xdrs->x_private = (void *) m;
|
|
xdrs->x_handy = pos;
|
|
|
|
return (TRUE);
|
|
}
|
|
|
|
static int32_t *
|
|
xdrmbuf_inline(XDR *xdrs, u_int len)
|
|
{
|
|
struct mbuf *m = (struct mbuf *) xdrs->x_private;
|
|
size_t available;
|
|
char *p;
|
|
|
|
if (!m)
|
|
return (0);
|
|
if (xdrs->x_op == XDR_ENCODE) {
|
|
available = M_TRAILINGSPACE(m) + (m->m_len - xdrs->x_handy);
|
|
} else {
|
|
available = m->m_len - xdrs->x_handy;
|
|
}
|
|
|
|
if (available >= len) {
|
|
p = mtod(m, char *) + xdrs->x_handy;
|
|
if (((uintptr_t) p) & (sizeof(int32_t) - 1))
|
|
return (0);
|
|
xdrs->x_handy += len;
|
|
if (xdrs->x_handy > m->m_len)
|
|
m->m_len = xdrs->x_handy;
|
|
return ((int32_t *) p);
|
|
}
|
|
|
|
return (0);
|
|
}
|