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ed4f16ff6b
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>
(cherry picked from commit f9dc609e06)
129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/* Verify ISO-2022-CN-EXT does not write out of the bounds.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <iconv.h>
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#include <sys/mman.h>
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#include <support/xunistd.h>
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#include <support/check.h>
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#include <support/support.h>
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/* The test sets up a two memory page buffer with the second page marked
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PROT_NONE to trigger a fault if the conversion writes beyond the exact
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expected amount. Then we carry out various conversions and precisely
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place the start of the output buffer in order to trigger a SIGSEGV if the
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process writes anywhere between 1 and page sized bytes more (only one
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PROT_NONE page is setup as a canary) than expected. These tests exercise
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all three of the cases in ISO-2022-CN-EXT where the converter must switch
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character sets and may run out of buffer space while doing the
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operation. */
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static int
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do_test (void)
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{
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iconv_t cd = iconv_open ("ISO-2022-CN-EXT", "UTF-8");
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TEST_VERIFY_EXIT (cd != (iconv_t) -1);
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char *ntf;
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size_t ntfsize;
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char *outbufbase;
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{
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int pgz = getpagesize ();
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TEST_VERIFY_EXIT (pgz > 0);
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ntfsize = 2 * pgz;
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ntf = xmmap (NULL, ntfsize, PROT_READ | PROT_WRITE, MAP_PRIVATE
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| MAP_ANONYMOUS, -1);
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xmprotect (ntf + pgz, pgz, PROT_NONE);
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outbufbase = ntf + pgz;
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}
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/* Check if SOdesignation escape sequence does not trigger an OOB write. */
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{
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char inbuf[] = "\xe4\xba\xa4\xe6\x8d\xa2";
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for (int i = 0; i < 9; i++)
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{
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char *inp = inbuf;
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size_t inleft = sizeof (inbuf) - 1;
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char *outp = outbufbase - i;
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size_t outleft = i;
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TEST_VERIFY_EXIT (iconv (cd, &inp, &inleft, &outp, &outleft)
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== (size_t) -1);
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TEST_COMPARE (errno, E2BIG);
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TEST_VERIFY_EXIT (iconv (cd, NULL, NULL, NULL, NULL) == 0);
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}
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}
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/* Same as before for SS2designation. */
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{
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char inbuf[] = "㴽 \xe3\xb4\xbd";
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for (int i = 0; i < 14; i++)
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{
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char *inp = inbuf;
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size_t inleft = sizeof (inbuf) - 1;
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char *outp = outbufbase - i;
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size_t outleft = i;
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TEST_VERIFY_EXIT (iconv (cd, &inp, &inleft, &outp, &outleft)
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== (size_t) -1);
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TEST_COMPARE (errno, E2BIG);
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TEST_VERIFY_EXIT (iconv (cd, NULL, NULL, NULL, NULL) == 0);
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}
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}
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/* Same as before for SS3designation. */
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{
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char inbuf[] = "劄 \xe5\x8a\x84";
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for (int i = 0; i < 14; i++)
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{
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char *inp = inbuf;
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size_t inleft = sizeof (inbuf) - 1;
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char *outp = outbufbase - i;
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size_t outleft = i;
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TEST_VERIFY_EXIT (iconv (cd, &inp, &inleft, &outp, &outleft)
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== (size_t) -1);
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TEST_COMPARE (errno, E2BIG);
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TEST_VERIFY_EXIT (iconv (cd, NULL, NULL, NULL, NULL) == 0);
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}
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}
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TEST_VERIFY_EXIT (iconv_close (cd) != -1);
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xmunmap (ntf, ntfsize);
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return 0;
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}
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#include <support/test-driver.c>
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