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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>
This commit is contained in:
Florian Weimer
parent
df359a25ba
commit
7d88c6142c
@ -74,7 +74,7 @@ ifeq (yes,$(build-shared))
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tests = bug-iconv1 bug-iconv2 tst-loading tst-e2big tst-iconv4 bug-iconv4 \
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tst-iconv6 bug-iconv5 bug-iconv6 tst-iconv7 bug-iconv8 bug-iconv9 \
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bug-iconv10 bug-iconv11 bug-iconv12 tst-iconv-big5-hkscs-to-2ucs4 \
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bug-iconv13
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bug-iconv13 bug-iconv14
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ifeq ($(have-thread-library),yes)
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tests += bug-iconv3
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endif
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@ -322,6 +322,8 @@ $(objpfx)bug-iconv10.out: $(objpfx)gconv-modules \
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$(addprefix $(objpfx),$(modules.so))
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$(objpfx)bug-iconv12.out: $(objpfx)gconv-modules \
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$(addprefix $(objpfx),$(modules.so))
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$(objpfx)bug-iconv14.out: $(objpfx)gconv-modules \
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$(addprefix $(objpfx),$(modules.so))
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$(objpfx)iconv-test.out: run-iconv-test.sh $(objpfx)gconv-modules \
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$(addprefix $(objpfx),$(modules.so)) \
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127
iconvdata/bug-iconv14.c
Normal file
127
iconvdata/bug-iconv14.c
Normal file
@ -0,0 +1,127 @@
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/* Assertion in ISO-2022-JP-3 due to two-character sequence (bug 27256).
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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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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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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#include <iconv.h>
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#include <string.h>
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#include <errno.h>
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#include <support/check.h>
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/* Use an escape sequence to return to the initial state. */
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static void
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with_escape_sequence (void)
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{
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iconv_t c = iconv_open ("UTF-8", "ISO-2022-JP-3");
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TEST_VERIFY_EXIT (c != (iconv_t) -1);
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char in[] = "\e$(O+D\e(B";
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char *inbuf = in;
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size_t inleft = strlen (in);
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char out[3]; /* Space for one output character. */
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char *outbuf;
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size_t outleft;
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outbuf = out;
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outleft = sizeof (out);
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TEST_COMPARE (iconv (c, &inbuf, &inleft, &outbuf, &outleft), (size_t) -1);
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TEST_COMPARE (errno, E2BIG);
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TEST_COMPARE (inleft, 3);
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TEST_COMPARE (inbuf - in, strlen (in) - 3);
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TEST_COMPARE (outleft, sizeof (out) - 2);
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TEST_COMPARE (outbuf - out, 2);
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TEST_COMPARE (out[0] & 0xff, 0xc3);
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TEST_COMPARE (out[1] & 0xff, 0xa6);
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/* Return to the initial shift state, producing the pending
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character. */
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outbuf = out;
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outleft = sizeof (out);
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TEST_COMPARE (iconv (c, &inbuf, &inleft, &outbuf, &outleft), 0);
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TEST_COMPARE (inleft, 0);
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TEST_COMPARE (inbuf - in, strlen (in));
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TEST_COMPARE (outleft, sizeof (out) - 2);
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TEST_COMPARE (outbuf - out, 2);
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TEST_COMPARE (out[0] & 0xff, 0xcc);
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TEST_COMPARE (out[1] & 0xff, 0x80);
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/* Nothing should be flushed the second time. */
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outbuf = out;
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outleft = sizeof (out);
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TEST_COMPARE (iconv (c, NULL, 0, &outbuf, &outleft), 0);
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TEST_COMPARE (outleft, sizeof (out));
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TEST_COMPARE (outbuf - out, 0);
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TEST_COMPARE (out[0] & 0xff, 0xcc);
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TEST_COMPARE (out[1] & 0xff, 0x80);
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TEST_COMPARE (iconv_close (c), 0);
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}
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/* Use an explicit flush to return to the initial state. */
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static void
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with_flush (void)
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{
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iconv_t c = iconv_open ("UTF-8", "ISO-2022-JP-3");
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TEST_VERIFY_EXIT (c != (iconv_t) -1);
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char in[] = "\e$(O+D";
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char *inbuf = in;
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size_t inleft = strlen (in);
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char out[3]; /* Space for one output character. */
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char *outbuf;
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size_t outleft;
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outbuf = out;
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outleft = sizeof (out);
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TEST_COMPARE (iconv (c, &inbuf, &inleft, &outbuf, &outleft), (size_t) -1);
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TEST_COMPARE (errno, E2BIG);
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TEST_COMPARE (inleft, 0);
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TEST_COMPARE (inbuf - in, strlen (in));
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TEST_COMPARE (outleft, sizeof (out) - 2);
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TEST_COMPARE (outbuf - out, 2);
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TEST_COMPARE (out[0] & 0xff, 0xc3);
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TEST_COMPARE (out[1] & 0xff, 0xa6);
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/* Flush the pending character. */
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outbuf = out;
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outleft = sizeof (out);
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TEST_COMPARE (iconv (c, NULL, 0, &outbuf, &outleft), 0);
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TEST_COMPARE (outleft, sizeof (out) - 2);
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TEST_COMPARE (outbuf - out, 2);
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TEST_COMPARE (out[0] & 0xff, 0xcc);
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TEST_COMPARE (out[1] & 0xff, 0x80);
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/* Nothing should be flushed the second time. */
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outbuf = out;
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outleft = sizeof (out);
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TEST_COMPARE (iconv (c, NULL, 0, &outbuf, &outleft), 0);
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TEST_COMPARE (outleft, sizeof (out));
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TEST_COMPARE (outbuf - out, 0);
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TEST_COMPARE (out[0] & 0xff, 0xcc);
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TEST_COMPARE (out[1] & 0xff, 0x80);
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TEST_COMPARE (iconv_close (c), 0);
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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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with_escape_sequence ();
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with_flush ();
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return 0;
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}
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#include <support/test-driver.c>
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@ -67,23 +67,34 @@ enum
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CURRENT_SEL_MASK = 7 << 3
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};
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/* During UCS-4 to ISO-2022-JP-3 conversion, the COUNT element of the state
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also contains the last two bytes to be output, shifted by 6 bits, and a
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one-bit indicator whether they must be preceded by the shift sequence,
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in bit 22. */
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/* During UCS-4 to ISO-2022-JP-3 conversion, the COUNT element of the
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state also contains the last two bytes to be output, shifted by 6
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bits, and a one-bit indicator whether they must be preceded by the
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shift sequence, in bit 22. During ISO-2022-JP-3 to UCS-4
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conversion, COUNT may also contain a non-zero pending wide
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character, shifted by six bits. This happens for certain inputs in
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JISX0213_1_2004_set and JISX0213_2_set if the second wide character
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in a combining sequence cannot be written because the buffer is
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full. */
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/* Since this is a stateful encoding we have to provide code which resets
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the output state to the initial state. This has to be done during the
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flushing. */
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#define EMIT_SHIFT_TO_INIT \
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if ((data->__statep->__count & ~7) != ASCII_set) \
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if (data->__statep->__count != ASCII_set) \
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{ \
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if (FROM_DIRECTION) \
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{ \
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/* It's easy, we don't have to emit anything, we just reset the \
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state for the input. */ \
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data->__statep->__count &= 7; \
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data->__statep->__count |= ASCII_set; \
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if (__glibc_likely (outbuf + 4 <= outend)) \
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{ \
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/* Write out the last character. */ \
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*((uint32_t *) outbuf) = data->__statep->__count >> 6; \
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outbuf += sizeof (uint32_t); \
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data->__statep->__count = ASCII_set; \
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} \
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else \
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/* We don't have enough room in the output buffer. */ \
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status = __GCONV_FULL_OUTPUT; \
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} \
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else \
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{ \
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@ -151,7 +162,21 @@ enum
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#define LOOPFCT FROM_LOOP
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#define BODY \
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{ \
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uint32_t ch = *inptr; \
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uint32_t ch; \
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\
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/* Output any pending character. */ \
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ch = set >> 6; \
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if (__glibc_unlikely (ch != 0)) \
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{ \
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put32 (outptr, ch); \
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outptr += 4; \
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/* Remove the pending character, but preserve state bits. */ \
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set &= (1 << 6) - 1; \
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continue; \
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} \
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\
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/* Otherwise read the next input byte. */ \
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ch = *inptr; \
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\
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/* Recognize escape sequences. */ \
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if (__glibc_unlikely (ch == ESC)) \
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@ -297,21 +322,25 @@ enum
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uint32_t u1 = __jisx0213_to_ucs_combining[ch - 1][0]; \
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uint32_t u2 = __jisx0213_to_ucs_combining[ch - 1][1]; \
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\
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inptr += 2; \
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\
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put32 (outptr, u1); \
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outptr += 4; \
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\
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/* See whether we have room for two characters. */ \
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if (outptr + 8 <= outend) \
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if (outptr + 4 <= outend) \
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{ \
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inptr += 2; \
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put32 (outptr, u1); \
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outptr += 4; \
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put32 (outptr, u2); \
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outptr += 4; \
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continue; \
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} \
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else \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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/* Otherwise store only the first character now, and \
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put the second one into the queue. */ \
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set |= u2 << 6; \
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/* Tell the caller why we terminate the loop. */ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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inptr += 2; \
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