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2ac88eecc5
This patch changes both the nptl and libc Linux raise implementation
to avoid the issues described in BZ#15368. The strategy used is
summarized in bug report first comment:
1. Block all signals (including internal NPTL ones);
2. Get pid and tid directly from syscall (not relying on cached
values);
3. Call tgkill;
4. Restore old signal mask.
Tested on x86_64 and i686.
[BZ #15368]
* sysdeps/unix/sysv/linux/nptl-signals.h
(__nptl_clear_internal_signals): New function.
(__libc_signal_block_all): Likewise.
(__libc_signal_block_app): Likewise.
(__libc_signal_restore_set): Likewise.
* sysdeps/unix/sysv/linux/pt-raise.c (raise): Use Linux raise.c
implementation.
* sysdeps/unix/sysv/linux/raise.c (raise): Reimplement to not use
the cached pid/tid value in pthread structure.
61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <signal.h>
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#include <sysdep.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <nptl-signals.h>
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int
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raise (int sig)
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{
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/* raise is an async-safe function so it could be called while the
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fork/vfork function temporarily invalidated the PID field. To avoid
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relying on cached value we block all user-defined signal handler
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(which might call fork/vfork) and issue the getpid and gettid
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syscalls directly. */
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/* rt_sigprocmask may fail if:
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1. sigsetsize != sizeof (sigset_t) (EINVAL)
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2. a failure in copy from/to user space (EFAULT)
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3. an invalid 'how' operation (EINVAL)
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The first case is already handle in glibc syscall call by using the arch
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defined _NSIG. Second case is handled by using a stack allocated mask.
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The last one should be handled by the block/unblock functions. */
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sigset_t set;
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__libc_signal_block_app (&set);
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INTERNAL_SYSCALL_DECL (err);
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pid_t pid = INTERNAL_SYSCALL (getpid, err, 0);
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pid_t tid = INTERNAL_SYSCALL (gettid, err, 0);
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int ret = INLINE_SYSCALL (tgkill, 3, pid, tid, sig);
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__libc_signal_restore_set (&set);
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return ret;
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}
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libc_hidden_def (raise)
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weak_alias (raise, gsignal)
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