public inbox for glibc-cvs@sourceware.org
help / color / mirror / Atom feed
* [glibc/fw/bug30555] string: strerror must not return NULL (bug 30555)
@ 2023-06-15 17:55 Florian Weimer
0 siblings, 0 replies; only message in thread
From: Florian Weimer @ 2023-06-15 17:55 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1d44530a5be2442e064baa48139adc9fdfb1fc6b
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>
Diff:
---
string/Makefile | 1 +
string/strerror_l.c | 13 +++++---
string/tst-strerror-fail.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 87 insertions(+), 4 deletions(-)
diff --git a/string/Makefile b/string/Makefile
index 0ad276cc6a..d3106d10a9 100644
--- a/string/Makefile
+++ b/string/Makefile
@@ -178,6 +178,7 @@ tests := \
tst-endian \
tst-inlcall \
tst-memmove-overflow \
+ tst-strerror-fail \
tst-strfry \
tst-strlcat \
tst-strlcpy \
diff --git a/string/strerror_l.c b/string/strerror_l.c
index 7fe9b1d903..e5c8666198 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 0000000000..e0fa45ab2b
--- /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>
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2023-06-15 17:55 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-06-15 17:55 [glibc/fw/bug30555] string: strerror must not return NULL (bug 30555) Florian Weimer
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).