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commit ee7a3144c9922808181009b7b3e50e852fb4999b
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Author: Andreas Schwab <schwab@suse.de>
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Date: Mon Dec 21 08:56:43 2020 +0530
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Fix buffer overrun in EUC-KR conversion module (bz #24973)
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The byte 0xfe as input to the EUC-KR conversion denotes a user-defined
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area and is not allowed. The from_euc_kr function used to skip two bytes
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when told to skip over the unknown designation, potentially running over
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the buffer end.
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# Conflicts:
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# iconvdata/Makefile
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diff --git a/iconvdata/Makefile b/iconvdata/Makefile
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index 06e161d9b8f67118..a47a4c07cd2e3d1b 100644
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--- a/iconvdata/Makefile
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+++ b/iconvdata/Makefile
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@@ -73,7 +73,7 @@ modules.so := $(addsuffix .so, $(modules))
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ifeq (yes,$(build-shared))
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tests = bug-iconv1 bug-iconv2 tst-loading tst-e2big tst-iconv4 bug-iconv4 \
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tst-iconv6 bug-iconv5 bug-iconv6 tst-iconv7 bug-iconv8 bug-iconv9 \
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- bug-iconv10 bug-iconv11 bug-iconv12
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+ bug-iconv10 bug-iconv11 bug-iconv12 bug-iconv13
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ifeq ($(have-thread-library),yes)
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tests += bug-iconv3
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endif
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diff --git a/iconvdata/bug-iconv13.c b/iconvdata/bug-iconv13.c
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new file mode 100644
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index 0000000000000000..87aaff398e0f6167
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--- /dev/null
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+++ b/iconvdata/bug-iconv13.c
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@@ -0,0 +1,53 @@
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+/* bug 24973: Test EUC-KR module
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+ Copyright (C) 2020 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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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+
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+#include <errno.h>
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+#include <iconv.h>
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+#include <stdio.h>
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+#include <support/check.h>
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+
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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 ("UTF-8//IGNORE", "EUC-KR");
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+ TEST_VERIFY_EXIT (cd != (iconv_t) -1);
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+
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+ /* 0xfe (->0x7e : row 94) and 0xc9 (->0x49 : row 41) are user-defined
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+ areas, which are not allowed and should be skipped over due to
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+ //IGNORE. The trailing 0xfe also is an incomplete sequence, which
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+ should be checked first. */
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+ char input[4] = { '\xc9', '\xa1', '\0', '\xfe' };
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+ char *inptr = input;
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+ size_t insize = sizeof (input);
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+ char output[4];
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+ char *outptr = output;
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+ size_t outsize = sizeof (output);
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+
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+ /* This used to crash due to buffer overrun. */
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+ TEST_VERIFY (iconv (cd, &inptr, &insize, &outptr, &outsize) == (size_t) -1);
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+ TEST_VERIFY (errno == EINVAL);
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+ /* The conversion should produce one character, the converted null
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+ character. */
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+ TEST_VERIFY (sizeof (output) - outsize == 1);
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+
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+ TEST_VERIFY_EXIT (iconv_close (cd) != -1);
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+
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+ return 0;
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+}
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+
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+#include <support/test-driver.c>
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diff --git a/iconvdata/euc-kr.c b/iconvdata/euc-kr.c
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index 73e02817a07e873d..dc7eaa6596f5d4d4 100644
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--- a/iconvdata/euc-kr.c
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+++ b/iconvdata/euc-kr.c
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@@ -80,11 +80,7 @@ euckr_from_ucs4 (uint32_t ch, unsigned char *cp)
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\
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if (ch <= 0x9f) \
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++inptr; \
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- /* 0xfe(->0x7e : row 94) and 0xc9(->0x59 : row 41) are \
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- user-defined areas. */ \
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- else if (__builtin_expect (ch == 0xa0, 0) \
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- || __builtin_expect (ch > 0xfe, 0) \
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- || __builtin_expect (ch == 0xc9, 0)) \
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+ else if (__glibc_unlikely (ch == 0xa0)) \
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{ \
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/* This is illegal. */ \
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STANDARD_FROM_LOOP_ERR_HANDLER (1); \
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diff --git a/iconvdata/ksc5601.h b/iconvdata/ksc5601.h
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index 5588d3a14b667b42..fa2d30677c41f46a 100644
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--- a/iconvdata/ksc5601.h
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+++ b/iconvdata/ksc5601.h
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@@ -50,15 +50,15 @@ ksc5601_to_ucs4 (const unsigned char **s, size_t avail, unsigned char offset)
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unsigned char ch2;
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int idx;
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+ if (avail < 2)
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+ return 0;
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+
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/* row 94(0x7e) and row 41(0x49) are user-defined area in KS C 5601 */
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if (ch < offset || (ch - offset) <= 0x20 || (ch - offset) >= 0x7e
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|| (ch - offset) == 0x49)
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return __UNKNOWN_10646_CHAR;
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- if (avail < 2)
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- return 0;
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-
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ch2 = (*s)[1];
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if (ch2 < offset || (ch2 - offset) <= 0x20 || (ch2 - offset) >= 0x7f)
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return __UNKNOWN_10646_CHAR;
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