tsan_shared.go

     1  // Copyright 2017 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  // This program failed with SIGSEGV when run under the C/C++ ThreadSanitizer.
     8  // The Go runtime had re-registered the C handler with the wrong flags due to a
     9  // typo, resulting in null pointers being passed for the info and context
    10  // parameters to the handler.
    11  
    12  /*
    13  #cgo CFLAGS: -fsanitize=thread
    14  #cgo LDFLAGS: -fsanitize=thread
    15  
    16  #include <signal.h>
    17  #include <stdio.h>
    18  #include <stdlib.h>
    19  #include <string.h>
    20  #include <ucontext.h>
    21  
    22  void check_params(int signo, siginfo_t *info, void *context) {
    23  	ucontext_t* uc = (ucontext_t*)(context);
    24  
    25  	if (info->si_signo != signo) {
    26  		fprintf(stderr, "info->si_signo does not match signo.\n");
    27  		abort();
    28  	}
    29  
    30  	if (uc->uc_stack.ss_size == 0) {
    31  		fprintf(stderr, "uc_stack has size 0.\n");
    32  		abort();
    33  	}
    34  }
    35  
    36  
    37  // Set up the signal handler in a high priority constructor, so
    38  // that it is installed before the Go code starts.
    39  
    40  static void register_handler(void) __attribute__ ((constructor (200)));
    41  
    42  static void register_handler() {
    43  	struct sigaction sa;
    44  	memset(&sa, 0, sizeof(sa));
    45  	sigemptyset(&sa.sa_mask);
    46  	sa.sa_flags = SA_SIGINFO;
    47  	sa.sa_sigaction = check_params;
    48  
    49  	if (sigaction(SIGUSR1, &sa, NULL) != 0) {
    50  		perror("failed to register SIGUSR1 handler");
    51  		exit(EXIT_FAILURE);
    52  	}
    53  }
    54  */
    55  import "C"
    56  
    57  import "syscall"
    58  
    59  func init() {
    60  	C.raise(C.int(syscall.SIGUSR1))
    61  }
    62  
    63  func main() {}
    64
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