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glibc.21967
gconv-assertion-iso-2022-jp.patch
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File gconv-assertion-iso-2022-jp.patch of Package glibc.21967
From 7d88c6142c6efc160c0ee5e4f85cde382c072888 Mon Sep 17 00:00:00 2001 From: Florian Weimer <fweimer@redhat.com> Date: Wed, 27 Jan 2021 13:36:12 +0100 Subject: [PATCH] gconv: Fix assertion failure in ISO-2022-JP-3 module (bug 27256) The conversion loop to the internal encoding does not follow the interface contract that __GCONV_FULL_OUTPUT is only returned after the internal wchar_t buffer has been filled completely. This is enforced by the first of the two asserts in iconv/skeleton.c: /* We must run out of output buffer space in this rerun. */ assert (outbuf == outerr); assert (nstatus == __GCONV_FULL_OUTPUT); This commit solves this issue by queuing a second wide character which cannot be written immediately in the state variable, like other converters already do (e.g., BIG5-HKSCS or TSCII). Reported-by: Tavis Ormandy <taviso@gmail.com> --- iconvdata/Makefile | 4 +- iconvdata/bug-iconv14.c | 127 ++++++++++++++++++++++++++++++++++++++ iconvdata/iso-2022-jp-3.c | 67 ++++++++++++++------ 3 files changed, 178 insertions(+), 20 deletions(-) create mode 100644 iconvdata/bug-iconv14.c Index: glibc-2.31/iconvdata/Makefile =================================================================== --- glibc-2.31.orig/iconvdata/Makefile +++ glibc-2.31/iconvdata/Makefile @@ -73,7 +73,7 @@ modules.so := $(addsuffix .so, $(modules ifeq (yes,$(build-shared)) tests = bug-iconv1 bug-iconv2 tst-loading tst-e2big tst-iconv4 bug-iconv4 \ tst-iconv6 bug-iconv5 bug-iconv6 tst-iconv7 bug-iconv8 bug-iconv9 \ - bug-iconv10 bug-iconv11 bug-iconv12 bug-iconv13 + bug-iconv10 bug-iconv11 bug-iconv12 bug-iconv13 bug-iconv14 ifeq ($(have-thread-library),yes) tests += bug-iconv3 endif @@ -316,6 +316,8 @@ $(objpfx)bug-iconv10.out: $(objpfx)gconv $(addprefix $(objpfx),$(modules.so)) $(objpfx)bug-iconv12.out: $(objpfx)gconv-modules \ $(addprefix $(objpfx),$(modules.so)) +$(objpfx)bug-iconv14.out: $(objpfx)gconv-modules \ + $(addprefix $(objpfx),$(modules.so)) $(objpfx)iconv-test.out: run-iconv-test.sh $(objpfx)gconv-modules \ $(addprefix $(objpfx),$(modules.so)) \ Index: glibc-2.31/iconvdata/bug-iconv14.c =================================================================== --- /dev/null +++ glibc-2.31/iconvdata/bug-iconv14.c @@ -0,0 +1,127 @@ +/* Assertion in ISO-2022-JP-3 due to two-character sequence (bug 27256). + Copyright (C) 2021 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 <iconv.h> +#include <string.h> +#include <errno.h> +#include <support/check.h> + +/* Use an escape sequence to return to the initial state. */ +static void +with_escape_sequence (void) +{ + iconv_t c = iconv_open ("UTF-8", "ISO-2022-JP-3"); + TEST_VERIFY_EXIT (c != (iconv_t) -1); + + char in[] = "\e$(O+D\e(B"; + char *inbuf = in; + size_t inleft = strlen (in); + char out[3]; /* Space for one output character. */ + char *outbuf; + size_t outleft; + + outbuf = out; + outleft = sizeof (out); + TEST_COMPARE (iconv (c, &inbuf, &inleft, &outbuf, &outleft), (size_t) -1); + TEST_COMPARE (errno, E2BIG); + TEST_COMPARE (inleft, 3); + TEST_COMPARE (inbuf - in, strlen (in) - 3); + TEST_COMPARE (outleft, sizeof (out) - 2); + TEST_COMPARE (outbuf - out, 2); + TEST_COMPARE (out[0] & 0xff, 0xc3); + TEST_COMPARE (out[1] & 0xff, 0xa6); + + /* Return to the initial shift state, producing the pending + character. */ + outbuf = out; + outleft = sizeof (out); + TEST_COMPARE (iconv (c, &inbuf, &inleft, &outbuf, &outleft), 0); + TEST_COMPARE (inleft, 0); + TEST_COMPARE (inbuf - in, strlen (in)); + TEST_COMPARE (outleft, sizeof (out) - 2); + TEST_COMPARE (outbuf - out, 2); + TEST_COMPARE (out[0] & 0xff, 0xcc); + TEST_COMPARE (out[1] & 0xff, 0x80); + + /* Nothing should be flushed the second time. */ + outbuf = out; + outleft = sizeof (out); + TEST_COMPARE (iconv (c, NULL, 0, &outbuf, &outleft), 0); + TEST_COMPARE (outleft, sizeof (out)); + TEST_COMPARE (outbuf - out, 0); + TEST_COMPARE (out[0] & 0xff, 0xcc); + TEST_COMPARE (out[1] & 0xff, 0x80); + + TEST_COMPARE (iconv_close (c), 0); +} + +/* Use an explicit flush to return to the initial state. */ +static void +with_flush (void) +{ + iconv_t c = iconv_open ("UTF-8", "ISO-2022-JP-3"); + TEST_VERIFY_EXIT (c != (iconv_t) -1); + + char in[] = "\e$(O+D"; + char *inbuf = in; + size_t inleft = strlen (in); + char out[3]; /* Space for one output character. */ + char *outbuf; + size_t outleft; + + outbuf = out; + outleft = sizeof (out); + TEST_COMPARE (iconv (c, &inbuf, &inleft, &outbuf, &outleft), (size_t) -1); + TEST_COMPARE (errno, E2BIG); + TEST_COMPARE (inleft, 0); + TEST_COMPARE (inbuf - in, strlen (in)); + TEST_COMPARE (outleft, sizeof (out) - 2); + TEST_COMPARE (outbuf - out, 2); + TEST_COMPARE (out[0] & 0xff, 0xc3); + TEST_COMPARE (out[1] & 0xff, 0xa6); + + /* Flush the pending character. */ + outbuf = out; + outleft = sizeof (out); + TEST_COMPARE (iconv (c, NULL, 0, &outbuf, &outleft), 0); + TEST_COMPARE (outleft, sizeof (out) - 2); + TEST_COMPARE (outbuf - out, 2); + TEST_COMPARE (out[0] & 0xff, 0xcc); + TEST_COMPARE (out[1] & 0xff, 0x80); + + /* Nothing should be flushed the second time. */ + outbuf = out; + outleft = sizeof (out); + TEST_COMPARE (iconv (c, NULL, 0, &outbuf, &outleft), 0); + TEST_COMPARE (outleft, sizeof (out)); + TEST_COMPARE (outbuf - out, 0); + TEST_COMPARE (out[0] & 0xff, 0xcc); + TEST_COMPARE (out[1] & 0xff, 0x80); + + TEST_COMPARE (iconv_close (c), 0); +} + +static int +do_test (void) +{ + with_escape_sequence (); + with_flush (); + return 0; +} + +#include <support/test-driver.c> Index: glibc-2.31/iconvdata/iso-2022-jp-3.c =================================================================== --- glibc-2.31.orig/iconvdata/iso-2022-jp-3.c +++ glibc-2.31/iconvdata/iso-2022-jp-3.c @@ -67,23 +67,34 @@ enum CURRENT_SEL_MASK = 7 << 3 }; -/* During UCS-4 to ISO-2022-JP-3 conversion, the COUNT element of the state - also contains the last two bytes to be output, shifted by 6 bits, and a - one-bit indicator whether they must be preceded by the shift sequence, - in bit 22. */ +/* During UCS-4 to ISO-2022-JP-3 conversion, the COUNT element of the + state also contains the last two bytes to be output, shifted by 6 + bits, and a one-bit indicator whether they must be preceded by the + shift sequence, in bit 22. During ISO-2022-JP-3 to UCS-4 + conversion, COUNT may also contain a non-zero pending wide + character, shifted by six bits. This happens for certain inputs in + JISX0213_1_2004_set and JISX0213_2_set if the second wide character + in a combining sequence cannot be written because the buffer is + full. */ /* Since this is a stateful encoding we have to provide code which resets the output state to the initial state. This has to be done during the flushing. */ #define EMIT_SHIFT_TO_INIT \ - if ((data->__statep->__count & ~7) != ASCII_set) \ + if (data->__statep->__count != ASCII_set) \ { \ if (FROM_DIRECTION) \ { \ - /* It's easy, we don't have to emit anything, we just reset the \ - state for the input. */ \ - data->__statep->__count &= 7; \ - data->__statep->__count |= ASCII_set; \ + if (__glibc_likely (outbuf + 4 <= outend)) \ + { \ + /* Write out the last character. */ \ + *((uint32_t *) outbuf) = data->__statep->__count >> 6; \ + outbuf += sizeof (uint32_t); \ + data->__statep->__count = ASCII_set; \ + } \ + else \ + /* We don't have enough room in the output buffer. */ \ + status = __GCONV_FULL_OUTPUT; \ } \ else \ { \ @@ -151,7 +162,21 @@ enum #define LOOPFCT FROM_LOOP #define BODY \ { \ - uint32_t ch = *inptr; \ + uint32_t ch; \ + \ + /* Output any pending character. */ \ + ch = set >> 6; \ + if (__glibc_unlikely (ch != 0)) \ + { \ + put32 (outptr, ch); \ + outptr += 4; \ + /* Remove the pending character, but preserve state bits. */ \ + set &= (1 << 6) - 1; \ + continue; \ + } \ + \ + /* Otherwise read the next input byte. */ \ + ch = *inptr; \ \ /* Recognize escape sequences. */ \ if (__glibc_unlikely (ch == ESC)) \ @@ -297,21 +322,25 @@ enum uint32_t u1 = __jisx0213_to_ucs_combining[ch - 1][0]; \ uint32_t u2 = __jisx0213_to_ucs_combining[ch - 1][1]; \ \ + inptr += 2; \ + \ + put32 (outptr, u1); \ + outptr += 4; \ + \ /* See whether we have room for two characters. */ \ - if (outptr + 8 <= outend) \ + if (outptr + 4 <= outend) \ { \ - inptr += 2; \ - put32 (outptr, u1); \ - outptr += 4; \ put32 (outptr, u2); \ outptr += 4; \ continue; \ } \ - else \ - { \ - result = __GCONV_FULL_OUTPUT; \ - break; \ - } \ + \ + /* Otherwise store only the first character now, and \ + put the second one into the queue. */ \ + set |= u2 << 6; \ + /* Tell the caller why we terminate the loop. */ \ + result = __GCONV_FULL_OUTPUT; \ + break; \ } \ \ inptr += 2; \
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