diff options
Diffstat (limited to 'iconvdata/tst-iconv-iso-2022-cn-ext.c')
| -rw-r--r-- | iconvdata/tst-iconv-iso-2022-cn-ext.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/iconvdata/tst-iconv-iso-2022-cn-ext.c b/iconvdata/tst-iconv-iso-2022-cn-ext.c new file mode 100644 index 0000000..96a8765 --- /dev/null +++ b/iconvdata/tst-iconv-iso-2022-cn-ext.c @@ -0,0 +1,128 @@ +/* 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> |