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[glibc] Fix iconv buffer handling with IGNORE error handler (bug #18830)
- From: Andreas Schwab <schwab at sourceware dot org>
- To: glibc-cvs at sourceware dot org
- Date: 4 Jun 2019 12:04:39 -0000
- Subject: [glibc] Fix iconv buffer handling with IGNORE error handler (bug #18830)
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4802be92c891903caaf8cae47f685da6f26d4b9a
commit 4802be92c891903caaf8cae47f685da6f26d4b9a
Author: Andreas Schwab <schwab@suse.de>
Date: Mon Aug 17 14:05:01 2015 +0200
Fix iconv buffer handling with IGNORE error handler (bug #18830)
Diff:
---
ChangeLog | 17 +++++++++++
iconv/Makefile | 2 +-
iconv/gconv_simple.c | 32 ++++++++++++--------
iconv/skeleton.c | 35 +++++++++++++++++-----
iconv/tst-iconv7.c | 55 +++++++++++++++++++++++++++++++++++
sysdeps/s390/multiarch/gconv_simple.c | 6 ++--
6 files changed, 124 insertions(+), 23 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 5aa6755..0d749e3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,20 @@
+2019-06-04 Andreas Schwab <schwab@suse.de>
+
+ [BZ #18830]
+ * iconv/skeleton.c (FUNCTION_NAME): Use RESET_INPUT_BUFFER only if
+ no irreversible characters occurred.
+ * iconv/gconv_simple.c (internal_ucs4_loop)
+ (internal_ucs4_loop_unaligned, internal_ucs4_loop_single)
+ (ucs4_internal_loop, ucs4_internal_loop_unaligned)
+ (ucs4_internal_loop_single, internal_ucs4le_loop)
+ (internal_ucs4le_loop_unaligned, internal_ucs4le_loop_single)
+ (ucs4le_internal_loop, ucs4le_internal_loop_unaligned)
+ (ucs4le_internal_loop_single): Add const to outend.
+ * sysdeps/s390/multiarch/gconv_simple.c (internal_ucs4le_loop)
+ (ucs4_internal_loop, ucs4le_internal_loop): Likewise.
+ * iconv/Makefile (tests): Add tst-iconv7.
+ * iconv/tst-iconv7.c: New file.
+
2019-06-03 Joseph Myers <joseph@codesourcery.com>
* inet/netinet/in.h (INADDR_ALLSNOOPERS_GROUP): New macro.
diff --git a/iconv/Makefile b/iconv/Makefile
index f6631e8..74cd9bf 100644
--- a/iconv/Makefile
+++ b/iconv/Makefile
@@ -44,7 +44,7 @@ CFLAGS-linereader.c += -DNO_TRANSLITERATION
CFLAGS-simple-hash.c += -I../locale
tests = tst-iconv1 tst-iconv2 tst-iconv3 tst-iconv4 tst-iconv5 tst-iconv6 \
- tst-iconv-mt
+ tst-iconv7 tst-iconv-mt
others = iconv_prog iconvconfig
install-others-programs = $(inst_bindir)/iconv
diff --git a/iconv/gconv_simple.c b/iconv/gconv_simple.c
index 35aaa8a..75ce8fb 100644
--- a/iconv/gconv_simple.c
+++ b/iconv/gconv_simple.c
@@ -76,7 +76,7 @@ __attribute ((always_inline))
internal_ucs4_loop (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp, const unsigned char *inend,
- unsigned char **outptrp, unsigned char *outend,
+ unsigned char **outptrp, const unsigned char *outend,
size_t *irreversible)
{
const unsigned char *inptr = *inptrp;
@@ -120,7 +120,8 @@ internal_ucs4_loop_unaligned (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp,
const unsigned char *inend,
- unsigned char **outptrp, unsigned char *outend,
+ unsigned char **outptrp,
+ const unsigned char *outend,
size_t *irreversible)
{
const unsigned char *inptr = *inptrp;
@@ -169,7 +170,8 @@ internal_ucs4_loop_single (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp,
const unsigned char *inend,
- unsigned char **outptrp, unsigned char *outend,
+ unsigned char **outptrp,
+ const unsigned char *outend,
size_t *irreversible)
{
mbstate_t *state = step_data->__statep;
@@ -231,7 +233,7 @@ __attribute ((always_inline))
ucs4_internal_loop (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp, const unsigned char *inend,
- unsigned char **outptrp, unsigned char *outend,
+ unsigned char **outptrp, const unsigned char *outend,
size_t *irreversible)
{
int flags = step_data->__flags;
@@ -298,7 +300,8 @@ ucs4_internal_loop_unaligned (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp,
const unsigned char *inend,
- unsigned char **outptrp, unsigned char *outend,
+ unsigned char **outptrp,
+ const unsigned char *outend,
size_t *irreversible)
{
int flags = step_data->__flags;
@@ -368,7 +371,8 @@ ucs4_internal_loop_single (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp,
const unsigned char *inend,
- unsigned char **outptrp, unsigned char *outend,
+ unsigned char **outptrp,
+ const unsigned char *outend,
size_t *irreversible)
{
mbstate_t *state = step_data->__statep;
@@ -443,7 +447,7 @@ __attribute ((always_inline))
internal_ucs4le_loop (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp, const unsigned char *inend,
- unsigned char **outptrp, unsigned char *outend,
+ unsigned char **outptrp, const unsigned char *outend,
size_t *irreversible)
{
const unsigned char *inptr = *inptrp;
@@ -488,7 +492,8 @@ internal_ucs4le_loop_unaligned (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp,
const unsigned char *inend,
- unsigned char **outptrp, unsigned char *outend,
+ unsigned char **outptrp,
+ const unsigned char *outend,
size_t *irreversible)
{
const unsigned char *inptr = *inptrp;
@@ -540,7 +545,8 @@ internal_ucs4le_loop_single (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp,
const unsigned char *inend,
- unsigned char **outptrp, unsigned char *outend,
+ unsigned char **outptrp,
+ const unsigned char *outend,
size_t *irreversible)
{
mbstate_t *state = step_data->__statep;
@@ -601,7 +607,7 @@ __attribute ((always_inline))
ucs4le_internal_loop (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp, const unsigned char *inend,
- unsigned char **outptrp, unsigned char *outend,
+ unsigned char **outptrp, const unsigned char *outend,
size_t *irreversible)
{
int flags = step_data->__flags;
@@ -671,7 +677,8 @@ ucs4le_internal_loop_unaligned (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp,
const unsigned char *inend,
- unsigned char **outptrp, unsigned char *outend,
+ unsigned char **outptrp,
+ const unsigned char *outend,
size_t *irreversible)
{
int flags = step_data->__flags;
@@ -745,7 +752,8 @@ ucs4le_internal_loop_single (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp,
const unsigned char *inend,
- unsigned char **outptrp, unsigned char *outend,
+ unsigned char **outptrp,
+ const unsigned char *outend,
size_t *irreversible)
{
mbstate_t *state = step_data->__statep;
diff --git a/iconv/skeleton.c b/iconv/skeleton.c
index cc39fdc..7c12975 100644
--- a/iconv/skeleton.c
+++ b/iconv/skeleton.c
@@ -83,6 +83,11 @@
RESET_INPUT_BUFFER If the input character sets allow this the macro
can be defined to reset the input buffer pointers
to cover only those characters up to the error.
+ Note that if the conversion has skipped over
+ irreversible characters (due to
+ __GCONV_IGNORE_ERRORS) there is no longer a direct
+ correspondence between input and output pointers,
+ and this macro is not called.
FUNCTION_NAME if not set the conversion function is named `gconv'.
@@ -597,6 +602,12 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
inptr = *inptrp;
/* The outbuf buffer is empty. */
outstart = outbuf;
+#ifdef RESET_INPUT_BUFFER
+ /* Remember how many irreversible characters were skipped before
+ this round. */
+ size_t loop_irreversible
+ = lirreversible + (irreversible ? *irreversible : 0);
+#endif
#ifdef SAVE_RESET_STATE
SAVE_RESET_STATE (1);
@@ -671,8 +682,16 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
if (__glibc_unlikely (outerr != outbuf))
{
#ifdef RESET_INPUT_BUFFER
- RESET_INPUT_BUFFER;
-#else
+ /* RESET_INPUT_BUFFER can only work when there were
+ no new irreversible characters skipped during
+ this round. */
+ if (loop_irreversible
+ == lirreversible + (irreversible ? *irreversible : 0))
+ {
+ RESET_INPUT_BUFFER;
+ goto done_reset;
+ }
+#endif
/* We have a problem in one of the functions below.
Undo the conversion upto the error point. */
size_t nstatus __attribute__ ((unused));
@@ -682,9 +701,9 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
outbuf = outstart;
/* Restore the state. */
-# ifdef SAVE_RESET_STATE
+#ifdef SAVE_RESET_STATE
SAVE_RESET_STATE (0);
-# endif
+#endif
if (__glibc_likely (!unaligned))
{
@@ -701,7 +720,7 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
lirreversiblep
EXTRA_LOOP_ARGS);
}
-# if POSSIBLY_UNALIGNED
+#if POSSIBLY_UNALIGNED
else
{
if (FROM_DIRECTION)
@@ -720,7 +739,7 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
lirreversiblep
EXTRA_LOOP_ARGS);
}
-# endif
+#endif
/* We must run out of output buffer space in this
rerun. */
@@ -731,9 +750,11 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
the invocation counter. */
if (__glibc_unlikely (outbuf == outstart))
--data->__invocation_counter;
-#endif /* reset input buffer */
}
+#ifdef RESET_INPUT_BUFFER
+ done_reset:
+#endif
/* Change the status. */
status = result;
}
diff --git a/iconv/tst-iconv7.c b/iconv/tst-iconv7.c
new file mode 100644
index 0000000..10372bf
--- /dev/null
+++ b/iconv/tst-iconv7.c
@@ -0,0 +1,55 @@
+/* Test iconv buffer handling with the IGNORE error handler.
+ Copyright (C) 2019 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
+ <http://www.gnu.org/licenses/>. */
+
+/* Derived from BZ #18830 */
+#include <errno.h>
+#include <iconv.h>
+#include <stdio.h>
+#include <support/check.h>
+
+static int
+do_test (void)
+{
+ /* This conversion needs two steps, from ASCII to INTERNAL to ASCII. */
+ iconv_t cd = iconv_open ("ASCII//IGNORE", "ASCII");
+ TEST_VERIFY_EXIT (cd != (iconv_t) -1);
+
+ /* Convert some irreversible sequence, enough to trigger an overflow of
+ the output buffer before the irreversible character in the second
+ step, but after going past the irreversible character in the first
+ step. */
+ char input[4 + 4] = { '0', '1', '2', '3', '4', '5', '\266', '7' };
+ char *inptr = input;
+ size_t insize = sizeof (input);
+ char output[4];
+ char *outptr = output;
+ size_t outsize = sizeof (output);
+
+ /* The conversion should fail. */
+ TEST_VERIFY (iconv (cd, &inptr, &insize, &outptr, &outsize) == (size_t) -1);
+ TEST_VERIFY (errno == E2BIG);
+ /* The conversion should not consume more than it was able to store in
+ the output buffer. */
+ TEST_COMPARE (inptr - input, sizeof (output) - outsize);
+
+ TEST_VERIFY_EXIT (iconv_close (cd) != -1);
+
+ return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/sysdeps/s390/multiarch/gconv_simple.c b/sysdeps/s390/multiarch/gconv_simple.c
index ce7bcf5..2861b6d 100644
--- a/sysdeps/s390/multiarch/gconv_simple.c
+++ b/sysdeps/s390/multiarch/gconv_simple.c
@@ -404,7 +404,7 @@ ICONV_VX_NAME (internal_ucs4le_loop) (struct __gconv_step *step,
const unsigned char **inptrp,
const unsigned char *inend,
unsigned char **outptrp,
- unsigned char *outend,
+ const unsigned char *outend,
size_t *irreversible)
{
const unsigned char *inptr = *inptrp;
@@ -504,7 +504,7 @@ ICONV_VX_NAME (ucs4_internal_loop) (struct __gconv_step *step,
const unsigned char **inptrp,
const unsigned char *inend,
unsigned char **outptrp,
- unsigned char *outend,
+ const unsigned char *outend,
size_t *irreversible)
{
int flags = step_data->__flags;
@@ -631,7 +631,7 @@ ICONV_VX_NAME (ucs4le_internal_loop) (struct __gconv_step *step,
const unsigned char **inptrp,
const unsigned char *inend,
unsigned char **outptrp,
- unsigned char *outend,
+ const unsigned char *outend,
size_t *irreversible)
{
int flags = step_data->__flags;