diff options
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | nptl/forward.c | 15 | ||||
| -rw-r--r-- | sysdeps/generic/safe-fatal.h | 37 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/safe-fatal.h | 33 |
4 files changed, 82 insertions, 9 deletions
@@ -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. diff --git a/nptl/forward.c b/nptl/forward.c index 6355c23..eb3c41f 100644 --- a/nptl/forward.c +++ b/nptl/forward.c @@ -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 ()) diff --git a/sysdeps/generic/safe-fatal.h b/sysdeps/generic/safe-fatal.h new file mode 100644 index 0000000..6efced3 --- /dev/null +++ b/sysdeps/generic/safe-fatal.h @@ -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 */ diff --git a/sysdeps/unix/sysv/linux/safe-fatal.h b/sysdeps/unix/sysv/linux/safe-fatal.h new file mode 100644 index 0000000..4de4c04 --- /dev/null +++ b/sysdeps/unix/sysv/linux/safe-fatal.h @@ -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 */ |