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author | Michael Colavita <mcolavita@fb.com> | 2020-11-19 11:44:40 -0500 |
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committer | Dmitry V. Levin <ldv@altlinux.org> | 2021-01-03 12:21:12 +0000 |
commit | 5fa7884e25c5d11718253244fd1bc570c60f4cc8 (patch) | |
tree | d47ed44419ce321de03b196420c64f4701d086a2 | |
parent | d8ae6c00a945aadc971cf2c33d9fb0ed31ebb5df (diff) | |
download | glibc-5fa7884e25c5d11718253244fd1bc570c60f4cc8.tar.gz glibc-5fa7884e25c5d11718253244fd1bc570c60f4cc8.tar.xz glibc-5fa7884e25c5d11718253244fd1bc570c60f4cc8.zip |
iconv: Fix incorrect UCS4 inner loop bounds (BZ#26923)
Previously, in UCS4 conversion routines we limit the number of characters we examine to the minimum of the number of characters in the input and the number of characters in the output. This is not the correct behavior when __GCONV_IGNORE_ERRORS is set, as we do not consume an output character when we skip a code unit. Instead, track the input and output pointers and terminate the loop when either reaches its limit. This resolves assertion failures when resetting the input buffer in a step of iconv, which assumes that the input will be fully consumed given sufficient output space. (cherry picked from commit 228edd356f03bf62dcf2b1335f25d43c602ee68d)
-rw-r--r-- | NEWS | 1 | ||||
-rw-r--r-- | iconv/Makefile | 2 | ||||
-rw-r--r-- | iconv/gconv_simple.c | 16 | ||||
-rw-r--r-- | iconv/tst-iconv8.c | 50 |
4 files changed, 56 insertions, 13 deletions
diff --git a/NEWS b/NEWS index 95d69cd07e..4482f95b94 100644 --- a/NEWS +++ b/NEWS @@ -190,6 +190,7 @@ The following bugs are resolved with this release: [26224] iconv hangs when converting some invalid inputs from several IBM character sets (CVE-2020-27618) [26383] bind_textdomain_codeset doesn't accept //TRANSLIT anymore + [26923] Assertion failure in iconv when converting invalid UCS4 (CVE-2020-29562) Version 2.27 diff --git a/iconv/Makefile b/iconv/Makefile index 934ecd16be..0d6aea6cd4 100644 --- a/iconv/Makefile +++ b/iconv/Makefile @@ -44,7 +44,7 @@ CFLAGS-linereader.c += -DNO_TRANSLITERATION CFLAGS-simple-hash.c += -I../locale tests = tst-iconv1 tst-iconv2 tst-iconv3 tst-iconv4 tst-iconv5 tst-iconv6 \ - tst-iconv7 tst-iconv-opt + tst-iconv7 tst-iconv8 tst-iconv-opt others = iconv_prog iconvconfig install-others-programs = $(inst_bindir)/iconv diff --git a/iconv/gconv_simple.c b/iconv/gconv_simple.c index c487b892a5..f47d56f44e 100644 --- a/iconv/gconv_simple.c +++ b/iconv/gconv_simple.c @@ -239,11 +239,9 @@ ucs4_internal_loop (struct __gconv_step *step, int flags = step_data->__flags; const unsigned char *inptr = *inptrp; unsigned char *outptr = *outptrp; - size_t n_convert = MIN (inend - inptr, outend - outptr) / 4; int result; - size_t cnt; - for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4) + for (; inptr + 4 <= inend && outptr + 4 <= outend; inptr += 4) { uint32_t inval; @@ -307,11 +305,9 @@ ucs4_internal_loop_unaligned (struct __gconv_step *step, int flags = step_data->__flags; const unsigned char *inptr = *inptrp; unsigned char *outptr = *outptrp; - size_t n_convert = MIN (inend - inptr, outend - outptr) / 4; int result; - size_t cnt; - for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4) + for (; inptr + 4 <= inend && outptr + 4 <= outend; inptr += 4) { if (__glibc_unlikely (inptr[0] > 0x80)) { @@ -613,11 +609,9 @@ ucs4le_internal_loop (struct __gconv_step *step, int flags = step_data->__flags; const unsigned char *inptr = *inptrp; unsigned char *outptr = *outptrp; - size_t n_convert = MIN (inend - inptr, outend - outptr) / 4; int result; - size_t cnt; - for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4) + for (; inptr + 4 <= inend && outptr + 4 <= outend; inptr += 4) { uint32_t inval; @@ -684,11 +678,9 @@ ucs4le_internal_loop_unaligned (struct __gconv_step *step, int flags = step_data->__flags; const unsigned char *inptr = *inptrp; unsigned char *outptr = *outptrp; - size_t n_convert = MIN (inend - inptr, outend - outptr) / 4; int result; - size_t cnt; - for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4) + for (; inptr + 4 <= inend && outptr + 4 <= outend; inptr += 4) { if (__glibc_unlikely (inptr[3] > 0x80)) { diff --git a/iconv/tst-iconv8.c b/iconv/tst-iconv8.c new file mode 100644 index 0000000000..0b92b19f66 --- /dev/null +++ b/iconv/tst-iconv8.c @@ -0,0 +1,50 @@ +/* Test iconv behavior on UCS4 conversions with //IGNORE. + Copyright (C) 2020 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 + <http://www.gnu.org/licenses/>. */ + +/* Derived from BZ #26923 */ +#include <errno.h> +#include <iconv.h> +#include <stdio.h> +#include <support/check.h> + +static int +do_test (void) +{ + iconv_t cd = iconv_open ("UTF-8//IGNORE", "ISO-10646/UCS4/"); + TEST_VERIFY_EXIT (cd != (iconv_t) -1); + + /* + * Convert sequence beginning with an irreversible character into buffer that + * is too small. + */ + char input[12] = "\xe1\x80\xa1" "AAAAAAAAA"; + char *inptr = input; + size_t insize = sizeof (input); + char output[6]; + char *outptr = output; + size_t outsize = sizeof (output); + + TEST_VERIFY (iconv (cd, &inptr, &insize, &outptr, &outsize) == -1); + TEST_VERIFY (errno == E2BIG); + + TEST_VERIFY_EXIT (iconv_close (cd) != -1); + + return 0; +} + +#include <support/test-driver.c> |