Mercurial > gnulib
view lib/strdup.c @ 37246:5cfb3a67238d
regex: avoid glibc deadlock during configure
glibc has a known bug where certain corruptions of the heap can
cause malloc to default to printing a debug message that includes
a backtrace, but the act of getting the backtrace uses dlopen
which in turn calls into malloc, causing a recursive lock ending
in deadlock. Thus, when configure is probing for a known glibc
heap corruption bug, the overall configure would hang.
The solution suggested by glibc developers is to force malloc
to quit printing debug messages, which avoids recursive malloc.
* m4/regex.m4 (gl_REGEX): Avoid recursive malloc deadlock when
glibc bug 15078 in turn triggers bug 16159.
Reported by Michal Privoznik.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 03 Dec 2013 10:34:13 -0700 |
parents | c741bc27922a |
children | 344018b6e5d7 |
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/* Copyright (C) 1991, 1996-1998, 2002-2004, 2006-2007, 2009-2013 Free Software Foundation, Inc. This file is part of the GNU C Library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _LIBC # include <config.h> #endif /* Get specification. */ #include <string.h> #include <stdlib.h> #undef __strdup #ifdef _LIBC # undef strdup #endif #ifndef weak_alias # define __strdup strdup #endif /* Duplicate S, returning an identical malloc'd string. */ char * __strdup (const char *s) { size_t len = strlen (s) + 1; void *new = malloc (len); if (new == NULL) return NULL; return (char *) memcpy (new, s, len); } #ifdef libc_hidden_def libc_hidden_def (__strdup) #endif #ifdef weak_alias weak_alias (__strdup, strdup) #endif