mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 04:50:07 +00:00
f9dc609e06
ISO-2022-CN-EXT uses escape sequences to indicate character set changes (as specified by RFC 1922). While the SOdesignation has the expected bounds checks, neither SS2designation nor SS3designation have its; allowing a write overflow of 1, 2, or 3 bytes with fixed values: '$+I', '$+J', '$+K', '$+L', '$+M', or '$*H'. Checked on aarch64-linux-gnu. Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/* Verify ISO-2022-CN-EXT does not write out of the bounds.
|
|
Copyright (C) 2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include <errno.h>
|
|
#include <iconv.h>
|
|
#include <sys/mman.h>
|
|
|
|
#include <support/xunistd.h>
|
|
#include <support/check.h>
|
|
#include <support/support.h>
|
|
|
|
/* The test sets up a two memory page buffer with the second page marked
|
|
PROT_NONE to trigger a fault if the conversion writes beyond the exact
|
|
expected amount. Then we carry out various conversions and precisely
|
|
place the start of the output buffer in order to trigger a SIGSEGV if the
|
|
process writes anywhere between 1 and page sized bytes more (only one
|
|
PROT_NONE page is setup as a canary) than expected. These tests exercise
|
|
all three of the cases in ISO-2022-CN-EXT where the converter must switch
|
|
character sets and may run out of buffer space while doing the
|
|
operation. */
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
iconv_t cd = iconv_open ("ISO-2022-CN-EXT", "UTF-8");
|
|
TEST_VERIFY_EXIT (cd != (iconv_t) -1);
|
|
|
|
char *ntf;
|
|
size_t ntfsize;
|
|
char *outbufbase;
|
|
{
|
|
int pgz = getpagesize ();
|
|
TEST_VERIFY_EXIT (pgz > 0);
|
|
ntfsize = 2 * pgz;
|
|
|
|
ntf = xmmap (NULL, ntfsize, PROT_READ | PROT_WRITE, MAP_PRIVATE
|
|
| MAP_ANONYMOUS, -1);
|
|
xmprotect (ntf + pgz, pgz, PROT_NONE);
|
|
|
|
outbufbase = ntf + pgz;
|
|
}
|
|
|
|
/* Check if SOdesignation escape sequence does not trigger an OOB write. */
|
|
{
|
|
char inbuf[] = "\xe4\xba\xa4\xe6\x8d\xa2";
|
|
|
|
for (int i = 0; i < 9; i++)
|
|
{
|
|
char *inp = inbuf;
|
|
size_t inleft = sizeof (inbuf) - 1;
|
|
|
|
char *outp = outbufbase - i;
|
|
size_t outleft = i;
|
|
|
|
TEST_VERIFY_EXIT (iconv (cd, &inp, &inleft, &outp, &outleft)
|
|
== (size_t) -1);
|
|
TEST_COMPARE (errno, E2BIG);
|
|
|
|
TEST_VERIFY_EXIT (iconv (cd, NULL, NULL, NULL, NULL) == 0);
|
|
}
|
|
}
|
|
|
|
/* Same as before for SS2designation. */
|
|
{
|
|
char inbuf[] = "㴽 \xe3\xb4\xbd";
|
|
|
|
for (int i = 0; i < 14; i++)
|
|
{
|
|
char *inp = inbuf;
|
|
size_t inleft = sizeof (inbuf) - 1;
|
|
|
|
char *outp = outbufbase - i;
|
|
size_t outleft = i;
|
|
|
|
TEST_VERIFY_EXIT (iconv (cd, &inp, &inleft, &outp, &outleft)
|
|
== (size_t) -1);
|
|
TEST_COMPARE (errno, E2BIG);
|
|
|
|
TEST_VERIFY_EXIT (iconv (cd, NULL, NULL, NULL, NULL) == 0);
|
|
}
|
|
}
|
|
|
|
/* Same as before for SS3designation. */
|
|
{
|
|
char inbuf[] = "劄 \xe5\x8a\x84";
|
|
|
|
for (int i = 0; i < 14; i++)
|
|
{
|
|
char *inp = inbuf;
|
|
size_t inleft = sizeof (inbuf) - 1;
|
|
|
|
char *outp = outbufbase - i;
|
|
size_t outleft = i;
|
|
|
|
TEST_VERIFY_EXIT (iconv (cd, &inp, &inleft, &outp, &outleft)
|
|
== (size_t) -1);
|
|
TEST_COMPARE (errno, E2BIG);
|
|
|
|
TEST_VERIFY_EXIT (iconv (cd, NULL, NULL, NULL, NULL) == 0);
|
|
}
|
|
}
|
|
|
|
TEST_VERIFY_EXIT (iconv_close (cd) != -1);
|
|
|
|
xmunmap (ntf, ntfsize);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|