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Fix memory leak in iconv_open (#1734680)

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This commit is contained in:
Florian Weimer 2019-07-31 11:53:38 +02:00
parent b3c6eb0e4c
commit a4d24cbe45
2 changed files with 285 additions and 1 deletions
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279
glibc-rh1734680.patch Normal file
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@ -0,0 +1,279 @@
iconv: Revert steps array reference counting changes
The changes introduce a memory leak for gconv steps arrays whose
first element is an internal conversion, which has a fixed
reference count which is not decremented. As a result, after the
change in commit 50ce3eae5ba304650459d4441d7d246a7cefc26f, the steps
array is never freed, resulting in an unbounded memory leak.
This reverts commit 50ce3eae5ba304650459d4441d7d246a7cefc26f
("gconv: Check reference count in __gconv_release_cache
[BZ #24677]") and commit 7e740ab2e7be7d83b75513aa406e0b10875f7f9c
("libio: Fix gconv-related memory leak [BZ #24583]"). It
reintroduces bug 24583. (Bug 24677 was just a regression caused by
the second commit.)
2019-07-31 Florian Weimer <fweimer@redhat.com>
[BZ #24583]
[BZ #24677]
iconv, libio: Revert reference counting changes.
* iconv/gconv_cache.c (__gconv_release_cache): Unconditionally
free the steps array.
* libio/Makefile (tests): Remove tst-wfile-gconv.
(tests-container): Do not add tst-wfile-ascii.
(tst-wfile-gconv-ENV): Do not set.
(generated): Do not add tst-wfile-gconv.mtrace,
tst-wfile-gconv.check.
[($run-built-tests)] (tests-special): Do not add
tst-wfile-gconv-mem.out.
(tst-wfile-gconv.out, tst-wfile-gconv-mem.out): Remove targets.
* libio/iofclose.c (_IO_new_fclose): Call __gconv_release_step
instead of __wcsmbs_clone_conv.
* wcsmbs/wcsmbsload.c (__wcsmbs_clone_conv): Remove definition.
* wcsmbs/wcsmbsload.h (__wcsmbs_clone_conv): Remove declaration.
diff --git a/iconv/gconv_cache.c b/iconv/gconv_cache.c
index 4db7287cee..9a456bf825 100644
--- a/iconv/gconv_cache.c
+++ b/iconv/gconv_cache.c
@@ -446,12 +446,9 @@ __gconv_lookup_cache (const char *toset, const char *fromset,
void
__gconv_release_cache (struct __gconv_step *steps, size_t nsteps)
{
- /* The only thing we have to deallocate is the record with the
- steps. But do not do this if the reference counter is still
- positive. This can happen if the steps array was cloned by
- __wcsmbs_clone_conv. (The array elements have separate __counter
- fields, but they are only out of sync temporarily.) */
- if (gconv_cache != NULL && steps->__counter == 0)
+ if (gconv_cache != NULL)
+ /* The only thing we have to deallocate is the record with the
+ steps. */
free (steps);
}
diff --git a/libio/Makefile b/libio/Makefile
index 6e594b8ec5..4a3637f046 100644
--- a/libio/Makefile
+++ b/libio/Makefile
@@ -66,11 +66,7 @@ tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc \
tst-fwrite-error tst-ftell-partial-wide tst-ftell-active-handler \
tst-ftell-append tst-fputws tst-bz22415 tst-fgetc-after-eof \
tst-sprintf-ub tst-sprintf-chk-ub tst-bz24051 tst-bz24153 \
- tst-wfile-sync tst-wfile-gconv
-
-# This test tests interaction with the gconv cache. Setting
-# GCONV_CACHE during out-of-container testing disables the cache.
-tests-container += tst-wfile-ascii
+ tst-wfile-sync
tests-internal = tst-vtables tst-vtables-interposed tst-readline
@@ -173,12 +169,10 @@ test-fmemopen-ENV = MALLOC_TRACE=$(objpfx)test-fmemopen.mtrace
tst-fopenloc-ENV = MALLOC_TRACE=$(objpfx)tst-fopenloc.mtrace
tst-bz22415-ENV = MALLOC_TRACE=$(objpfx)tst-bz22415.mtrace
tst-bz24228-ENV = MALLOC_TRACE=$(objpfx)tst-bz24228.mtrace
-tst-wfile-gconv-ENV = MALLOC_TRACE=$(objpfx)tst-wfile-gconv.mtrace
generated += test-fmemopen.mtrace test-fmemopen.check
generated += tst-fopenloc.mtrace tst-fopenloc.check
generated += tst-bz22415.mtrace tst-bz22415.check
-generated += tst-wfile-gconv.mtrace tst-wfile-gconv.check
aux := fileops genops stdfiles stdio strops
@@ -194,8 +188,7 @@ shared-only-routines = oldiofopen oldiofdopen oldiofclose oldfileops \
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)test-freopen.out $(objpfx)test-fmemopen-mem.out \
- $(objpfx)tst-bz22415-mem.out \
- $(objpfx)tst-wfile-gconv-mem.out
+ $(objpfx)tst-bz22415-mem.out
ifeq (yes,$(build-shared))
# Run tst-fopenloc-cmp.out and tst-openloc-mem.out only if shared
# library is enabled since they depend on tst-fopenloc.out.
@@ -229,7 +222,6 @@ $(objpfx)tst-ungetwc2.out: $(gen-locales)
$(objpfx)tst-widetext.out: $(gen-locales)
$(objpfx)tst_wprintf2.out: $(gen-locales)
$(objpfx)tst-wfile-sync.out: $(gen-locales)
-$(objpfx)tst-wfile-gconv.out: $(gen-locales)
endif
$(objpfx)test-freopen.out: test-freopen.sh $(objpfx)test-freopen
@@ -257,7 +249,3 @@ $(objpfx)tst-bz22415-mem.out: $(objpfx)tst-bz22415.out
$(objpfx)tst-bz24228-mem.out: $(objpfx)tst-bz24228.out
$(common-objpfx)malloc/mtrace $(objpfx)tst-bz24228.mtrace > $@; \
$(evaluate-test)
-
-$(objpfx)tst-wfile-gconv-mem.out: $(objpfx)tst-wfile-gconv.out
- $(common-objpfx)malloc/mtrace $(objpfx)tst-wfile-gconv.mtrace > $@; \
- $(evaluate-test)
diff --git a/libio/iofclose.c b/libio/iofclose.c
index c03c6cf57c..8a80dd0b78 100644
--- a/libio/iofclose.c
+++ b/libio/iofclose.c
@@ -26,8 +26,8 @@
#include "libioP.h"
#include <stdlib.h>
+#include "../iconv/gconv_int.h"
#include <shlib-compat.h>
-#include <wcsmbs/wcsmbsload.h>
int
_IO_new_fclose (FILE *fp)
@@ -60,14 +60,11 @@ _IO_new_fclose (FILE *fp)
/* This stream has a wide orientation. This means we have to free
the conversion functions. */
struct _IO_codecvt *cc = fp->_codecvt;
- struct gconv_fcts conv =
- {
- .towc = cc->__cd_in.__cd.__steps,
- .towc_nsteps = cc->__cd_in.__cd.__nsteps,
- .tomb = cc->__cd_out.__cd.__steps,
- .tomb_nsteps = cc->__cd_out.__cd.__nsteps,
- };
- __wcsmbs_close_conv (&conv);
+
+ __libc_lock_lock (__gconv_lock);
+ __gconv_release_step (cc->__cd_in.__cd.__steps);
+ __gconv_release_step (cc->__cd_out.__cd.__steps);
+ __libc_lock_unlock (__gconv_lock);
}
else
{
diff --git a/libio/tst-wfile-ascii.c b/libio/tst-wfile-ascii.c
deleted file mode 100644
index 7514289a7b..0000000000
--- a/libio/tst-wfile-ascii.c
+++ /dev/null
@@ -1,56 +0,0 @@
-/* Test ASCII gconv module followed by cache initialization.
- 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/>. */
-
-#include <stdlib.h>
-#include <support/check.h>
-#include <support/support.h>
-#include <support/xstdio.h>
-#include <wchar.h>
-
-static int
-do_test (void)
-{
- /* The test-in-container framework sets these environment variables.
- The presence of GCONV_PATH invalidates this test. */
- unsetenv ("GCONV_PATH");
- unsetenv ("LOCPATH");
-
- /* Create the gconv module cache. iconvconfig is in /sbin, which is
- not on PATH. */
- {
- char *iconvconfig = xasprintf ("%s/iconvconfig", support_sbindir_prefix);
- TEST_COMPARE (system (iconvconfig), 0);
- }
-
- /* Use built-in ASCII gconv module, without triggering cache
- initialization. */
- FILE *fp1 = xfopen ("/dev/zero", "r");
- TEST_COMPARE (fwide (fp1, 1), 1);
-
- /* Use non-ASCII gconv module and trigger gconv cache
- initialization. */
- FILE *fp2 = xfopen ("/dev/zero", "r,ccs=UTF-8");
- TEST_COMPARE (fwide (fp2, 0), 1);
-
- xfclose (fp1);
- xfclose (fp2);
-
- return 0;
-}
-
-#include <support/test-driver.c>
diff --git a/libio/tst-wfile-gconv.c b/libio/tst-wfile-gconv.c
deleted file mode 100644
index de603b32d2..0000000000
--- a/libio/tst-wfile-gconv.c
+++ /dev/null
@@ -1,36 +0,0 @@
-/* Test that non-built-in gconv modules do not cause memory leak (bug 24583).
- 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/>. */
-
-#include <locale.h>
-#include <mcheck.h>
-#include <support/check.h>
-#include <support/xstdio.h>
-
-static int
-do_test (void)
-{
- mtrace ();
-
- TEST_VERIFY_EXIT (setlocale (LC_ALL, "ja_JP.EUC-JP") != NULL);
- xfclose (xfopen ("/etc/passwd", "r,ccs=UTF-8"));
- xfclose (xfopen ("/etc/passwd", "r"));
-
- return 0;
-}
-
-#include <support/test-driver.c>
diff --git a/wcsmbs/wcsmbsload.c b/wcsmbs/wcsmbsload.c
index 840d4abc44..6648365d82 100644
--- a/wcsmbs/wcsmbsload.c
+++ b/wcsmbs/wcsmbsload.c
@@ -279,13 +279,3 @@ _nl_cleanup_ctype (struct __locale_data *locale)
free ((char *) data);
}
}
-
-/* Free the specified conversion functions (but not CONV itself). */
-void
-__wcsmbs_close_conv (struct gconv_fcts *conv)
-{
- if (conv->towc != &to_wc)
- __gconv_close_transform (conv->towc, conv->towc_nsteps);
- if (conv->tomb != &to_mb)
- __gconv_close_transform (conv->tomb, conv->tomb_nsteps);
-}
diff --git a/wcsmbs/wcsmbsload.h b/wcsmbs/wcsmbsload.h
index c2fffbd914..6ccad4b3ba 100644
--- a/wcsmbs/wcsmbsload.h
+++ b/wcsmbs/wcsmbsload.h
@@ -51,7 +51,6 @@ extern int __wcsmbs_named_conv (struct gconv_fcts *copy, const char *name)
/* Function used for the `private.cleanup' hook. */
extern void _nl_cleanup_ctype (struct __locale_data *) attribute_hidden;
-extern void __wcsmbs_close_conv (struct gconv_fcts *conv) attribute_hidden;
#include <iconv/gconv_int.h>

7
glibc.spec
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@ -87,7 +87,7 @@
Summary: The GNU libc libraries
Name: glibc
Version: %{glibcversion}
Release: 36%{?dist}
Release: 37%{?dist}
# In general, GPLv2+ is used by programs, LGPLv2+ is used for
# libraries.
@ -160,6 +160,8 @@ Patch28: glibc-rh1615608.patch
# https://www.sourceware.org/ml/libc-alpha/2019-03/msg00436.html
Patch31: glibc-fedora-nscd-warnings.patch
Patch32: glibc-rh1734680.patch
##############################################################################
# Continued list of core "glibc" package information:
##############################################################################
@ -2015,6 +2017,9 @@ fi
%files -f compat-libpthread-nonshared.filelist -n compat-libpthread-nonshared
%changelog
* Wed Jul 31 2019 Florian Weimer <fweimer@redhat.com> - 2.29.9000-37
- Fix memory leak in iconv_open (#1734680)
* Tue Jul 30 2019 Florian Weimer <fweimer@redhat.com> - 2.29.9000-36
- Drop glibc-rh1732406.patch, fix for the regression applied upstream.
- Auto-sync with upstream branch master,