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Add __safe_fatal and use it in __pthread_unwind forwarder fallback.

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This commit is contained in:
Roland McGrath 2014-07-31 14:00:33 -07:00
parent 9fe7e787ad
commit f61a113fe0
4 changed files with 82 additions and 9 deletions
ChangeLog
nptl
forward.c
sysdeps
generic
safe-fatal.h
unix/sysv/linux
safe-fatal.h

6
ChangeLog
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@ -1,5 +1,11 @@
2014-07-31 Roland McGrath <roland@hack.frob.com>
* sysdeps/generic/safe-fatal.h: New file.
* sysdeps/unix/sysv/linux/safe-fatal.h: New file.
* nptl/forward.c: Include it.
(__pthread_unwind): Use __safe_fatal as default action, rather
than a bogus use of INTERNAL_SYSCALL that could never work.
* config.h.in (HAVE_BUILTIN_TRAP): New #define to 0.
* configure.ac (libc_cv_builtin_trap): New test.
* configure: Regenerated.

15
nptl/forward.c
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@ -23,7 +23,7 @@
#include <shlib-compat.h>
#include <atomic.h>
#include <sysdep.h>
#include <safe-fatal.h>
/* Pointers to the libc functions. */
@ -202,11 +202,8 @@ FORWARD (pthread_setcancelstate, (int state, int *oldstate), (state, oldstate),
FORWARD (pthread_setcanceltype, (int type, int *oldtype), (type, oldtype), 0)
FORWARD_NORETURN(__pthread_unwind,
void attribute_hidden __attribute ((noreturn)) __cleanup_fct_attribute
attribute_compat_text_section,
(__pthread_unwind_buf_t *buf), (buf), {
/* We cannot call abort() here. */
INTERNAL_SYSCALL_DECL (err);
INTERNAL_SYSCALL (kill, err, 1, SIGKILL);
})
FORWARD_NORETURN (__pthread_unwind,
void attribute_hidden __attribute ((noreturn))
__cleanup_fct_attribute attribute_compat_text_section,
(__pthread_unwind_buf_t *buf), (buf),
__safe_fatal ())

37
sysdeps/generic/safe-fatal.h Normal file
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@ -0,0 +1,37 @@
/* Crash the process immediately, without possibility of deadlock. Generic.
Copyright (C) 2014 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
<http://www.gnu.org/licenses/>. */
#ifndef _SAFE_FATAL_H
#define _SAFE_FATAL_H 1
#include <abort-instr.h>
static inline void
__safe_fatal (void)
{
#ifdef ABORT_INSTRUCTION
/* This is not guaranteed to be free from the possibility of deadlock,
since it might generate a signal that can be caught. But it's better
than nothing. */
ABORT_INSTRUCTION;
#else
# error Need an OS-specific or machine-specific safe-fatal.h
#endif
}
#endif /* safe-fatal.h */

33
sysdeps/unix/sysv/linux/safe-fatal.h Normal file
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@ -0,0 +1,33 @@
/* Crash the process immediately, without possibility of deadlock. Linux.
Copyright (C) 2014 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
<http://www.gnu.org/licenses/>. */
#ifndef _SAFE_FATAL_H
#define _SAFE_FATAL_H 1
#include <sysdep.h>
#include <unistd.h>
static inline void
__safe_fatal (void)
{
INTERNAL_SYSCALL_DECL (err);
pid_t self = INTERNAL_SYSCALL (getpid, err, 0);
INTERNAL_SYSCALL (kill, err, 2, self, SIGKILL);
}
#endif /* safe-fatal.h */