bd6060a1c6
are aliases for the syscall stubs and are plt-interposed, to the libc-private aliases of internally interposed sigprocmask() etc. Since e.g. _sigaction is not interposed by libthr, calling signal() removes thr_sighandler() from the handler slot etc. The result was breaking signal semantic and rtld locking. The added __libc_sigprocmask and other symbols are hidden, they are not exported and cannot be called through PLT. The setjmp/longjmp functions for x86 were changed to use direct calls, and since PIC_PROLOGUE only needed for functional PLT indirection on i386, it is removed as well. The PowerPC bug of calling the syscall directly in the setjmp/longjmp implementation is kept as is. Reported by: Pete French <petefrench@ingresso.co.uk> Tested by: Michiel Boland <boland37@xs4all.nl> Reviewed by: jilles (previous version) Sponsored by: The FreeBSD Foundation MFC after: 1 week
113 lines
3.8 KiB
C
113 lines
3.8 KiB
C
/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)system.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <unistd.h>
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#include <paths.h>
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#include <errno.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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#pragma weak system
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int
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system(const char *command)
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{
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return (((int (*)(const char *))
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__libc_interposing[INTERPOS_system])(command));
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}
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int
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__libc_system(const char *command)
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{
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pid_t pid, savedpid;
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int pstat;
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struct sigaction ign, intact, quitact;
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sigset_t newsigblock, oldsigblock;
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if (!command) /* just checking... */
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return(1);
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(void)sigemptyset(&newsigblock);
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(void)sigaddset(&newsigblock, SIGCHLD);
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(void)sigaddset(&newsigblock, SIGINT);
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(void)sigaddset(&newsigblock, SIGQUIT);
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(void)__libc_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
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switch(pid = vfork()) {
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/*
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* In the child, use unwrapped syscalls. libthr is in
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* undefined state after vfork().
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*/
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case -1: /* error */
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(void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
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return (-1);
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case 0: /* child */
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/*
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* Restore original signal dispositions and exec the command.
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*/
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(void)__sys_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
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execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
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_exit(127);
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}
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/*
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* If we are running means that the child has either completed
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* its execve, or has failed.
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* Block SIGINT/QUIT because sh -c handles it and wait for
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* it to clean up.
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*/
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memset(&ign, 0, sizeof(ign));
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ign.sa_handler = SIG_IGN;
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(void)sigemptyset(&ign.sa_mask);
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(void)__libc_sigaction(SIGINT, &ign, &intact);
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(void)__libc_sigaction(SIGQUIT, &ign, &quitact);
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savedpid = pid;
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do {
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pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0);
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} while (pid == -1 && errno == EINTR);
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(void)__libc_sigaction(SIGINT, &intact, NULL);
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(void)__libc_sigaction(SIGQUIT, &quitact, NULL);
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(void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
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return (pid == -1 ? -1 : pstat);
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}
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__weak_reference(__libc_system, __system);
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__weak_reference(__libc_system, _system);
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