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commit 7d88c6142c6efc160c0ee5e4f85cde382c072888
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Wed Jan 27 13:36:12 2021 +0100
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gconv: Fix assertion failure in ISO-2022-JP-3 module (bug 27256)
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The conversion loop to the internal encoding does not follow
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the interface contract that __GCONV_FULL_OUTPUT is only returned
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after the internal wchar_t buffer has been filled completely. This
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is enforced by the first of the two asserts in iconv/skeleton.c:
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/* We must run out of output buffer space in this
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rerun. */
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assert (outbuf == outerr);
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assert (nstatus == __GCONV_FULL_OUTPUT);
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This commit solves this issue by queuing a second wide character
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which cannot be written immediately in the state variable, like
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other converters already do (e.g., BIG5-HKSCS or TSCII).
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Reported-by: Tavis Ormandy <taviso@gmail.com>
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Conflicts:
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iconvdata/Makefile
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(Usual differences in backported tests.)
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diff --git a/iconvdata/Makefile b/iconvdata/Makefile
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index a47a4c07cd2e3d1b..32656ad31d9b434b 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 bug-iconv13
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+ bug-iconv10 bug-iconv11 bug-iconv12 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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@@ -316,6 +316,8 @@ $(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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diff --git a/iconvdata/bug-iconv14.c b/iconvdata/bug-iconv14.c
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new file mode 100644
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index 0000000000000000..902f140fa949cbac
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--- /dev/null
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+++ b/iconvdata/bug-iconv14.c
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@@ -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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+
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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 <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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ TEST_COMPARE (iconv_close (c), 0);
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+}
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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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+
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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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+
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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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+
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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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+
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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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+
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+ TEST_COMPARE (iconv_close (c), 0);
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+}
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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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+
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+#include <support/test-driver.c>
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diff --git a/iconvdata/iso-2022-jp-3.c b/iconvdata/iso-2022-jp-3.c
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index de259580c3f378bb..047fab8e8dfbde7e 100644
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--- a/iconvdata/iso-2022-jp-3.c
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+++ b/iconvdata/iso-2022-jp-3.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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