2006-10-17 Jakub Jelinek <jakub@redhat.com> * sunrpc/xdr_mem.c (xdrmem_setpos): Don't compare addresses as signed longs, check for x_base + pos overflow. * sunrpc/Makefile (tests): Add tst-xdrmem2. * sunrpc/tst-xdrmem2.c: New test. --- libc/sunrpc/xdr_mem.c 16 Dec 2002 10:25:27 -0000 1.15 +++ libc/sunrpc/xdr_mem.c 18 Oct 2006 19:25:01 -0000 1.16 @@ -177,13 +177,15 @@ xdrmem_setpos (xdrs, pos) { caddr_t newaddr = xdrs->x_base + pos; caddr_t lastaddr = xdrs->x_private + xdrs->x_handy; + size_t handy = lastaddr - newaddr; - if ((long) newaddr > (long) lastaddr - || (UINT_MAX < LONG_MAX - && (long) UINT_MAX < (long) lastaddr - (long) newaddr)) + if (newaddr > lastaddr + || newaddr < xdrs->x_base + || handy != (u_int) handy) return FALSE; + xdrs->x_private = newaddr; - xdrs->x_handy = (long) lastaddr - (long) newaddr; + xdrs->x_handy = (u_int) handy; return TRUE; } --- libc/sunrpc/Makefile 26 Jun 2005 18:24:19 -0000 1.84 +++ libc/sunrpc/Makefile 18 Oct 2006 19:25:38 -0000 1.85 @@ -85,7 +85,7 @@ all: # Make this the default target; it include ../Makeconfig -tests = tst-xdrmem +tests = tst-xdrmem tst-xdrmem2 xtests := tst-getmyaddr ifeq ($(have-thread-library),yes) --- libc/sunrpc/tst-xdrmem2.c 1 Jan 1970 00:00:00 -0000 +++ libc/sunrpc/tst-xdrmem2.c 18 Oct 2006 19:24:16 -0000 1.1 @@ -0,0 +1,114 @@ +/* Copyright (C) 2006 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Jakub Jelinek <jakub@redhat.com>, 2006. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <limits.h> +#include <stdio.h> +#include <string.h> +#include <rpc/rpc.h> +#include <sys/mman.h> +#include <unistd.h> + +static int +do_test (void) +{ + XDR xdrs; + void *buf; + size_t ps = sysconf (_SC_PAGESIZE); + uintptr_t half = -1; + int v_int; + u_short v_u_short; + + half = (half >> 1) & ~(uintptr_t) (ps - 1); + buf = mmap ((void *) half, 2 * ps, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANON, -1, 0); + if (buf == MAP_FAILED || buf != (void *) half) + { + puts ("Couldn't mmap 2 pages in the middle of address space"); + return 0; + } + + xdrmem_create (&xdrs, (char *) buf, 2 * ps, XDR_ENCODE); + +#define T(type, val) \ + v_##type = val; \ + if (! xdr_##type (&xdrs, &v_##type)) \ + { \ + puts ("encoding of " #type \ + " " #val " failed"); \ + return 1; \ + } + + T(int, 127) + + u_int pos = xdr_getpos (&xdrs); + + T(u_short, 31) + + if (! xdr_setpos (&xdrs, pos)) + { + puts ("xdr_setpos during encoding failed"); + return 1; + } + + T(u_short, 36) + +#undef T + + xdr_destroy (&xdrs); + + xdrmem_create (&xdrs, (char *) buf, 2 * ps, XDR_DECODE); + +#define T(type, val) \ + v_##type = 0x15; \ + if (! xdr_##type (&xdrs, &v_##type)) \ + { \ + puts ("decoding of " #type \ + " " #val " failed"); \ + return 1; \ + } \ + if (v_##type != val) \ + { \ + puts ("decoded value differs, " \ + "type " #type " " #val); \ + return 1; \ + } + + T(int, 127) + + pos = xdr_getpos (&xdrs); + + T(u_short, 36) + + if (! xdr_setpos (&xdrs, pos)) + { + puts ("xdr_setpos during encoding failed"); + return 1; + } + + T(u_short, 36) + +#undef T + + xdr_destroy (&xdrs); + + return 0; +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c"