mirror of
https://github.com/golang/go
synced 2024-11-24 08:20:03 -07:00
4210930a28
A typo in the previous revision ("act" instead of "oldact") caused us
to return the sa_flags from the new (or zeroed) sigaction rather than
the old one.
In the presence of a signal handler registered before
runtime.libpreinit, this caused setsigstack to erroneously zero out
important sa_flags (such as SA_SIGINFO) in its attempt to re-register
the existing handler with SA_ONSTACK.
Change-Id: I3cd5152a38ec0d44ae611f183bc1651d65b8a115
Reviewed-on: https://go-review.googlesource.com/37852
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package main
|
|
|
|
// This program failed with SIGSEGV when run under the C/C++ ThreadSanitizer.
|
|
// The Go runtime had re-registered the C handler with the wrong flags due to a
|
|
// typo, resulting in null pointers being passed for the info and context
|
|
// parameters to the handler.
|
|
|
|
/*
|
|
#cgo CFLAGS: -fsanitize=thread
|
|
#cgo LDFLAGS: -fsanitize=thread
|
|
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <ucontext.h>
|
|
|
|
void check_params(int signo, siginfo_t *info, void *context) {
|
|
ucontext_t* uc = (ucontext_t*)(context);
|
|
|
|
if (info->si_signo != signo) {
|
|
fprintf(stderr, "info->si_signo does not match signo.\n");
|
|
abort();
|
|
}
|
|
|
|
if (uc->uc_stack.ss_size == 0) {
|
|
fprintf(stderr, "uc_stack has size 0.\n");
|
|
abort();
|
|
}
|
|
}
|
|
|
|
|
|
// Set up the signal handler in a high priority constructor, so
|
|
// that it is installed before the Go code starts.
|
|
|
|
static void register_handler(void) __attribute__ ((constructor (200)));
|
|
|
|
static void register_handler() {
|
|
struct sigaction sa;
|
|
memset(&sa, 0, sizeof(sa));
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_flags = SA_SIGINFO;
|
|
sa.sa_sigaction = check_params;
|
|
|
|
if (sigaction(SIGUSR1, &sa, NULL) != 0) {
|
|
perror("failed to register SIGUSR1 handler");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
*/
|
|
import "C"
|
|
|
|
import "syscall"
|
|
|
|
func init() {
|
|
C.raise(C.int(syscall.SIGUSR1))
|
|
}
|
|
|
|
func main() {}
|