From: Florian Weimer <fweimer@redhat.com>
To: libc-alpha@sourceware.org
Subject: [PATCH 3/3] assert: Do not use stderr in libc-internal assert
Date: Mon, 01 Aug 2022 12:45:50 +0200 [thread overview]
Message-ID: <32183839aed39d547a7ebbd50bbcd5575746a233.1659350650.git.fweimer@redhat.com> (raw)
In-Reply-To: <cover.1659350650.git.fweimer@redhat.com>
Redirect internal assertion failures to __libc_assert_fail, based on
based on __libc_message, which writes directly to STDERR_FILENO
and calls abort. Also disable message translation and reword the
error message slightly (adjusting stdlib/tst-bz20544 accordingly).
As a result of these changes, malloc no longer needs its own
redefinition of __assert_fail.
__libc_assert_fail needs to be stubbed out during rtld dependency
analysis because the rtld rebuilds turn __libc_assert_fail into
__assert_fail, which is unconditionally provided by elf/dl-minimal.c.
This change is not possible for the public assert macro and its
__assert_fail function because POSIX requires that the diagnostic
is written to stderr.
---
assert/Makefile | 7 ++++++-
assert/__libc_assert_fail.c | 33 +++++++++++++++++++++++++++++++++
assert/assert.c | 1 -
elf/Makefile | 1 +
include/assert.h | 12 +++++++++---
malloc/malloc.c | 16 ----------------
stdlib/tst-bz20544.c | 2 +-
7 files changed, 50 insertions(+), 22 deletions(-)
create mode 100644 assert/__libc_assert_fail.c
diff --git a/assert/Makefile b/assert/Makefile
index f7cf8e9b77..c905845a43 100644
--- a/assert/Makefile
+++ b/assert/Makefile
@@ -24,7 +24,12 @@ include ../Makeconfig
headers := assert.h
-routines := assert assert-perr __assert
+routines := \
+ __assert \
+ __libc_assert_fail \
+ assert \
+ assert-perr \
+ # routines
tests := test-assert test-assert-perr tst-assert-c++ tst-assert-g++
ifeq ($(have-cxx-thread_local),yes)
diff --git a/assert/__libc_assert_fail.c b/assert/__libc_assert_fail.c
new file mode 100644
index 0000000000..149d5feae1
--- /dev/null
+++ b/assert/__libc_assert_fail.c
@@ -0,0 +1,33 @@
+/* libc-internal assert that calls __libc_message.
+ Copyright (C) 2022 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 <_itoa.h>
+#include <array_length.h>
+#include <intprops.h>
+#include <stdio.h>
+
+void
+__libc_assert_fail (const char *assertion, const char *file, unsigned int line,
+ const char *function)
+{
+ char linebuf[INT_BUFSIZE_BOUND (unsigned int)];
+ array_end (linebuf)[-1] = '\0';
+ char *linestr = _itoa_word (line, array_end (linebuf) - 1, 10, 0);
+ __libc_message ("Fatal glibc error: %s:%s (%s): assertion failed: %s\n",
+ file, linestr, function, assertion);
+}
diff --git a/assert/assert.c b/assert/assert.c
index 133a183bc3..564ae28a2b 100644
--- a/assert/assert.c
+++ b/assert/assert.c
@@ -101,4 +101,3 @@ __assert_fail (const char *assertion, const char *file, unsigned int line,
__assert_fail_base (_("%s%s%s:%u: %s%sAssertion `%s' failed.\n%n"),
assertion, file, line, function);
}
-hidden_def(__assert_fail)
diff --git a/elf/Makefile b/elf/Makefile
index fd77d0c7c8..3386f0ce77 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -1283,6 +1283,7 @@ $(objpfx)dl-allobjs.os: $(all-rtld-routines:%=$(objpfx)%.os)
rtld-stubbed-symbols = \
__GI___pthread_disable_asynccancel \
__GI___pthread_enable_asynccancel \
+ __libc_assert_fail \
__pthread_disable_asynccancel \
__pthread_enable_asynccancel \
calloc \
diff --git a/include/assert.h b/include/assert.h
index 61cc8aa22f..c812808f9b 100644
--- a/include/assert.h
+++ b/include/assert.h
@@ -20,8 +20,14 @@ extern void __assert_fail_base (const char *fmt, const char *assertion,
const char *function)
__THROW __attribute__ ((__noreturn__)) attribute_hidden;
-# if IS_IN (libc) || (IS_IN (rtld) && !defined NO_RTLD_HIDDEN)
-hidden_proto (__assert_fail)
-hidden_proto (__assert_perror_fail)
+rtld_hidden_proto (__assert_fail)
+rtld_hidden_proto (__assert_perror_fail)
+libc_hidden_proto (__assert_perror_fail)
+
+
+# if IS_IN (libc)
+/* Redirect to the internal version which does not use stderr. */
+extern _Noreturn __typeof (__assert_fail) __libc_assert_fail attribute_hidden;
+# define __assert_fail __libc_assert_fail
# endif
#endif
diff --git a/malloc/malloc.c b/malloc/malloc.c
index f3320d2663..6f9c3b59b9 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -287,22 +287,6 @@
#define MALLOC_DEBUG 0
#endif
-#if IS_IN (libc)
-#ifndef NDEBUG
-# define __assert_fail(assertion, file, line, function) \
- __malloc_assert(assertion, file, line, function)
-
-_Noreturn static void
-__malloc_assert (const char *assertion, const char *file, unsigned int line,
- const char *function)
-{
- __libc_message ("Fatal glibc error: malloc assertion failure in %s: %s\n",
- function, assertion);
- __builtin_unreachable ();
-}
-#endif
-#endif
-
#if USE_TCACHE
/* We want 64 entries. This is an arbitrary limit, which tunables can reduce. */
# define TCACHE_MAX_BINS 64
diff --git a/stdlib/tst-bz20544.c b/stdlib/tst-bz20544.c
index 411cd3f3ba..7cc236a1b1 100644
--- a/stdlib/tst-bz20544.c
+++ b/stdlib/tst-bz20544.c
@@ -78,7 +78,7 @@ test_bz20544_cxa_at_quick_exit (void *closure)
static void
test_one_fn (void (*test_fn) (void *))
{
- const char expected_error[] = "Assertion `func != NULL' failed.\n";
+ const char expected_error[] = "assertion failed: func != NULL\n";
struct support_capture_subprocess result;
result = support_capture_subprocess (test_fn, NULL);
support_capture_subprocess_check (&result, "bz20544", -SIGABRT,
--
2.35.3
next prev parent reply other threads:[~2022-08-01 10:45 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-01 10:45 [PATCH 0/3] Internal asserts cleanups Florian Weimer
2022-08-01 10:45 ` [PATCH 1/3] stdio: Clean up __libc_message after unconditional abort Florian Weimer
2022-08-01 19:59 ` Adhemerval Zanella Netto
2022-08-02 8:03 ` Florian Weimer
2022-08-02 13:43 ` Adhemerval Zanella Netto
2022-08-01 10:45 ` [PATCH 2/3] nptl: Remove uses of assert_perror Florian Weimer
2022-08-01 20:01 ` Adhemerval Zanella Netto
2022-08-01 10:45 ` Florian Weimer [this message]
2022-08-01 20:04 ` [PATCH 3/3] assert: Do not use stderr in libc-internal assert Adhemerval Zanella Netto
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