From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 7814) id 994723858436; Sat, 28 Aug 2021 00:39:24 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 994723858436 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Fangrui Song To: glibc-cvs@sourceware.org Subject: [glibc/google/grte/v5-2.27/master] Fix buffer overrun in EUC-KR conversion module (bz #24973) X-Act-Checkin: glibc X-Git-Author: Andreas Schwab X-Git-Refname: refs/heads/google/grte/v5-2.27/master X-Git-Oldrev: b3331e2d53946662676c8604152816073f7c88aa X-Git-Newrev: c0e9696c3ccf8f86a43ec893d5f4dd911a957140 Message-Id: <20210828003924.994723858436@sourceware.org> Date: Sat, 28 Aug 2021 00:39:24 +0000 (GMT) X-BeenThere: glibc-cvs@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Glibc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 28 Aug 2021 00:39:24 -0000 https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c0e9696c3ccf8f86a43ec893d5f4dd911a957140 commit c0e9696c3ccf8f86a43ec893d5f4dd911a957140 Author: Andreas Schwab Date: Mon Dec 21 08:56:43 2020 +0530 Fix buffer overrun in EUC-KR conversion module (bz #24973) The byte 0xfe as input to the EUC-KR conversion denotes a user-defined area and is not allowed. The from_euc_kr function used to skip two bytes when told to skip over the unknown designation, potentially running over the buffer end. Diff: --- iconvdata/bug-iconv13.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++ iconvdata/euc-kr.c | 6 +----- iconvdata/ksc5601.h | 6 +++--- 3 files changed, 57 insertions(+), 8 deletions(-) diff --git a/iconvdata/bug-iconv13.c b/iconvdata/bug-iconv13.c new file mode 100644 index 0000000000..87aaff398e --- /dev/null +++ b/iconvdata/bug-iconv13.c @@ -0,0 +1,53 @@ +/* bug 24973: Test EUC-KR module + 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 + . */ + +#include +#include +#include +#include + +static int +do_test (void) +{ + iconv_t cd = iconv_open ("UTF-8//IGNORE", "EUC-KR"); + TEST_VERIFY_EXIT (cd != (iconv_t) -1); + + /* 0xfe (->0x7e : row 94) and 0xc9 (->0x49 : row 41) are user-defined + areas, which are not allowed and should be skipped over due to + //IGNORE. The trailing 0xfe also is an incomplete sequence, which + should be checked first. */ + char input[4] = { '\xc9', '\xa1', '\0', '\xfe' }; + char *inptr = input; + size_t insize = sizeof (input); + char output[4]; + char *outptr = output; + size_t outsize = sizeof (output); + + /* This used to crash due to buffer overrun. */ + TEST_VERIFY (iconv (cd, &inptr, &insize, &outptr, &outsize) == (size_t) -1); + TEST_VERIFY (errno == EINVAL); + /* The conversion should produce one character, the converted null + character. */ + TEST_VERIFY (sizeof (output) - outsize == 1); + + TEST_VERIFY_EXIT (iconv_close (cd) != -1); + + return 0; +} + +#include diff --git a/iconvdata/euc-kr.c b/iconvdata/euc-kr.c index 73e02817a0..dc7eaa6596 100644 --- a/iconvdata/euc-kr.c +++ b/iconvdata/euc-kr.c @@ -80,11 +80,7 @@ euckr_from_ucs4 (uint32_t ch, unsigned char *cp) \ if (ch <= 0x9f) \ ++inptr; \ - /* 0xfe(->0x7e : row 94) and 0xc9(->0x59 : row 41) are \ - user-defined areas. */ \ - else if (__builtin_expect (ch == 0xa0, 0) \ - || __builtin_expect (ch > 0xfe, 0) \ - || __builtin_expect (ch == 0xc9, 0)) \ + else if (__glibc_unlikely (ch == 0xa0)) \ { \ /* This is illegal. */ \ STANDARD_FROM_LOOP_ERR_HANDLER (1); \ diff --git a/iconvdata/ksc5601.h b/iconvdata/ksc5601.h index 5588d3a14b..fa2d30677c 100644 --- a/iconvdata/ksc5601.h +++ b/iconvdata/ksc5601.h @@ -50,15 +50,15 @@ ksc5601_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset) unsigned char ch2; int idx; + if (avail < 2) + return 0; + /* row 94(0x7e) and row 41(0x49) are user-defined area in KS C 5601 */ if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) >= 0x7e || (ch - offset) == 0x49) return __UNKNOWN_10646_CHAR; - if (avail < 2) - return 0; - ch2 = (*s)[1]; if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f) return __UNKNOWN_10646_CHAR;