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author | kib <kib@FreeBSD.org> | 2015-01-03 18:38:46 +0000 |
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committer | kib <kib@FreeBSD.org> | 2015-01-03 18:38:46 +0000 |
commit | 8d1dfb4106d37750d526e6b8edca5945f8b0a4d5 (patch) | |
tree | e381919bf3f754392eb9a47b256135a1dbb2b2b1 /lib/libc/sys/sendto.c | |
parent | 7ac15f4b4cebad0f4e9d2094b6ea3fefa77ae568 (diff) | |
download | FreeBSD-src-8d1dfb4106d37750d526e6b8edca5945f8b0a4d5.zip FreeBSD-src-8d1dfb4106d37750d526e6b8edca5945f8b0a4d5.tar.gz |
Fix known issues which blow up the process after dlopen("libthr.so")
(or loading a dso linked to libthr.so into process which was not
linked against threading library).
- Remove libthr interposers of the libc functions, including
__error(). Instead, functions calls are indirected through the
interposing table, similar to how pthread stubs in libc are already
done. Libc by default points either to syscall trampolines or to
existing libc implementations. On libthr load, libthr rewrites the
pointers to the cancellable implementations already in libthr. The
interposition table is separate from pthreads stubs indirection
table to not pull pthreads stubs into static binaries.
- Postpone the malloc(3) internal mutexes initialization until libthr
is loaded. This avoids recursion between calloc(3) and static
pthread_mutex_t initialization.
- Reinstall signal handlers with wrapper on libthr load. The
_rtld_is_dlopened(3) is used to avoid useless calls to sigaction(2)
when libthr is statically referenced from the main binary.
In the process, fix openat(2), swapcontext(2) and setcontext(2)
interposing. The libc symbols were exported at different versions
than libthr interposers. Export both libc and libthr versions from
libc now, with default set to the higher version from libthr.
Remove unused and disconnected swapcontext(3) userspace implementation
from libc/gen.
No objections from: deischen
Tested by: pho, antoine (exp-run) (previous versions)
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Diffstat (limited to 'lib/libc/sys/sendto.c')
-rw-r--r-- | lib/libc/sys/sendto.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/lib/libc/sys/sendto.c b/lib/libc/sys/sendto.c new file mode 100644 index 0000000..ecf98ee --- /dev/null +++ b/lib/libc/sys/sendto.c @@ -0,0 +1,53 @@ +/* + * Copyright (c) 2014 The FreeBSD Foundation. + * All rights reserved. + * + * Portions of this software were developed by Konstantin Belousov + * under sponsorship from the FreeBSD Foundation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice(s), this list of conditions and the following disclaimer as + * the first lines of this file unmodified other than the possible + * addition of one or more copyright notices. + * 2. Redistributions in binary form must reproduce the above copyright + * notice(s), this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE + * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, + * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/syscall.h> +#include <sys/socket.h> +#include "libc_private.h" + +__weak_reference(__sys_sendto, __sendto); + +#pragma weak sendto +ssize_t +sendto(int s, const void *msg, size_t len, int flags, + const struct sockaddr *to, socklen_t tolen) +{ + + return (((ssize_t (*)(int, const void *, size_t, int, + const struct sockaddr *, socklen_t)) + __libc_interposing[INTERPOS_sendto])(s, msg, len, flags, + to, tolen)); +} |