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strerror must not return NULL (#2215368) 

Resolves: #2215368
This commit is contained in:
Arjun Shankar 2023-06-26 16:39:05 +02:00
parent 7afefa800d
commit b5345eb1b6
2 changed files with 146 additions and 1 deletions
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137
glibc-rh2215368.patch Normal file
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@ -0,0 +1,137 @@
commit 1d44530a5be2442e064baa48139adc9fdfb1fc6b
Author: Florian Weimer <fweimer@redhat.com>
Date: Thu Jun 15 12:08:22 2023 +0200
string: strerror must not return NULL (bug 30555)
For strerror, this fixes commit 28aff047818eb1726394296d27b ("string:
Implement strerror in terms of strerror_l"). This commit avoids
returning NULL for strerror_l as well, although POSIX allows this
behavior for strerror_l.
Reviewed-by: Arjun Shankar <arjun@redhat.com>
Conflicts:
string/Makefile
(usual test differences)
diff --git a/string/Makefile b/string/Makefile
index f0fce2a0b8dea752..a385c8fdfed330b2 100644
--- a/string/Makefile
+++ b/string/Makefile
@@ -63,7 +63,7 @@ tests := tester inl-tester noinl-tester testcopy test-ffs \
tst-strtok_r bug-strcoll2 tst-cmp tst-xbzero-opt \
test-endian-types test-endian-file-scope \
test-endian-sign-conversion tst-memmove-overflow \
- test-sig_np
+ test-sig_np tst-strerror-fail
# Both tests require the .mo translation files generated by msgfmt.
tests-translation := tst-strsignal \
diff --git a/string/strerror_l.c b/string/strerror_l.c
index a381c79c5a0ba2a1..20aa3efe4714faee 100644
--- a/string/strerror_l.c
+++ b/string/strerror_l.c
@@ -43,10 +43,15 @@ __strerror_l (int errnum, locale_t loc)
struct tls_internal_t *tls_internal = __glibc_tls_internal ();
free (tls_internal->strerror_l_buf);
if (__asprintf (&tls_internal->strerror_l_buf, "%s%d",
- translate ("Unknown error ", loc), errnum) == -1)
- tls_internal->strerror_l_buf = NULL;
-
- err = tls_internal->strerror_l_buf;
+ translate ("Unknown error ", loc), errnum) > 0)
+ err = tls_internal->strerror_l_buf;
+ else
+ {
+ /* The memory was freed above. */
+ tls_internal->strerror_l_buf = NULL;
+ /* Provide a fallback translation. */
+ err = (char *) translate ("Unknown error", loc);
+ }
}
else
err = (char *) translate (err, loc);
diff --git a/string/tst-strerror-fail.c b/string/tst-strerror-fail.c
new file mode 100644
index 0000000000000000..e0fa45ab2b12f6b3
--- /dev/null
+++ b/string/tst-strerror-fail.c
@@ -0,0 +1,77 @@
+/* Check that strerror, strerror_l do not return NULL on failure (bug 30555).
+ Copyright (C) 2023 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 <locale.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <support/check.h>
+#include <support/namespace.h>
+#include <support/xdlfcn.h>
+
+/* Interposed malloc that can be used to inject allocation failures. */
+
+static volatile bool fail_malloc;
+
+void *
+malloc (size_t size)
+{
+ if (fail_malloc)
+ return NULL;
+
+ static void *(*original_malloc) (size_t);
+ if (original_malloc == NULL)
+ original_malloc = xdlsym (RTLD_NEXT, "malloc");
+ return original_malloc (size);
+}
+
+/* Callbacks for the actual tests. Use fork to run both tests with a
+ clean state. */
+
+static void
+test_strerror (void *closure)
+{
+ fail_malloc = true;
+ const char *s = strerror (999);
+ fail_malloc = false;
+ TEST_COMPARE_STRING (s, "Unknown error");
+}
+
+static void
+test_strerror_l (void *closure)
+{
+ locale_t loc = newlocale (LC_ALL, "C", (locale_t) 0);
+ TEST_VERIFY (loc != (locale_t) 0);
+ fail_malloc = true;
+ const char *s = strerror_l (999, loc);
+ fail_malloc = false;
+ TEST_COMPARE_STRING (s, "Unknown error");
+ freelocale (loc);
+}
+
+static int
+do_test (void)
+{
+ support_isolate_in_subprocess (test_strerror, NULL);
+ support_isolate_in_subprocess (test_strerror_l, NULL);
+
+ return 0;
+}
+
+#include <support/test-driver.c>

10
glibc.spec
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@ -155,7 +155,7 @@ end \
Summary: The GNU libc libraries
Name: glibc
Version: %{glibcversion}
Release: 68%{?dist}
Release: 69%{?dist}
# In general, GPLv2+ is used by programs, LGPLv2+ is used for
# libraries.
@ -719,6 +719,11 @@ Patch484: glibc-upstream-2.34-397.patch
# glibc-upstream-2.34-398.patch not backported because we can avoid the
# ABI tunable issue downstream, using @order directives.
# This marks the end of backports via upstream release/2.34/master.
# All future backports need maintain CentOS 9 Stream and RHEL 9 only.
Patch485: glibc-rh2215368.patch
##############################################################################
# Continued list of core "glibc" package information:
##############################################################################
@ -2875,6 +2880,9 @@ update_gconv_modules_cache ()
%endif
%changelog
* Mon Jun 26 2023 Arjun Shankar <arjun@redhat.com> - 2.34-69
- strerror must not return NULL (#2215368)
* Mon May 08 2023 DJ Delorie <dj@redhat.com> - 2.34-68
- Switch to sysusers_ctl instead of useradd (#2095417)