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      1 /*
      2  * Check decoding of signal syscall.
      3  *
      4  * Copyright (c) 2017 Dmitry V. Levin <ldv (at) altlinux.org>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include "tests.h"
     31 #include <asm/unistd.h>
     32 
     33 #ifdef __NR_signal
     34 
     35 # include <errno.h>
     36 # include <signal.h>
     37 # include <stdio.h>
     38 # include <stdint.h>
     39 # include <string.h>
     40 # include <unistd.h>
     41 
     42 static long
     43 k_signal(const kernel_ulong_t signum, const kernel_ulong_t handler)
     44 {
     45 	return syscall(__NR_signal, signum, handler);
     46 }
     47 
     48 int
     49 main(void)
     50 {
     51 	static const uintptr_t sig_ign = (uintptr_t) SIG_IGN;
     52 	static const uintptr_t sig_dfl = (uintptr_t) SIG_DFL;
     53 	static const kernel_ulong_t sigusr1 =
     54 		(kernel_ulong_t) 0xfacefeed00000000ULL | SIGUSR1;
     55 	static const struct sigaction act = { .sa_handler = SIG_DFL };
     56 	long rc;
     57 
     58 	sigset_t mask;
     59 	sigemptyset(&mask);
     60 	sigaddset(&mask, SIGUSR1);
     61 	if (sigprocmask(SIG_BLOCK, &mask, NULL))
     62 		perror_msg_and_fail("sigprocmask SIG_BLOCK");
     63 
     64 	if (sigaction(SIGUSR1, &act, NULL))
     65 		perror_msg_and_fail("sigaction");
     66 
     67 	rc = k_signal(sigusr1, sig_ign);
     68 
     69 	if (rc == -1L) {
     70 		printf("signal(SIGUSR1, SIG_IGN) = %s\n", sprintrc(rc));
     71 	} else if (rc != (long) sig_dfl) {
     72 		error_msg_and_fail("signal(SIGUSR1, SIG_IGN) = %#lx\n", rc);
     73 	} else {
     74 		printf("signal(SIGUSR1, SIG_IGN) = %#lx (SIG_DFL)\n", rc);
     75 
     76 		/*
     77 		 * Raise and unblock SIGUSR1.
     78 		 * If signal syscall failed to set SIGUSR1 handler to SIG_IGN,
     79 		 * the process will be terminated by SIGUSR1.
     80 		 */
     81 		raise(SIGUSR1);
     82 		if (sigprocmask(SIG_UNBLOCK, &mask, NULL))
     83 			perror_msg_and_fail("sigprocmask SIG_UNBLOCK");
     84 
     85 		if (sigprocmask(SIG_BLOCK, &mask, NULL))
     86 			perror_msg_and_fail("sigprocmask SIG_BLOCK");
     87 	}
     88 
     89 	rc = k_signal(SIGUSR1, sig_dfl);
     90 
     91 	if (rc == -1L) {
     92 		printf("signal(SIGUSR1, SIG_DFL) = %s\n", sprintrc(rc));
     93 	} else if (rc != (long) sig_ign) {
     94 		error_msg_and_fail("signal(SIGUSR1, SIG_DFL) = %#lx\n", rc);
     95 	} else {
     96 		printf("signal(SIGUSR1, SIG_DFL) = %#lx (SIG_IGN)\n", rc);
     97 	}
     98 
     99 	const kernel_ulong_t addr = (kernel_ulong_t) 0xfacefeeddeadbeefULL;
    100 	rc = k_signal(SIGUSR1, addr);
    101 
    102 	if (rc == -1L) {
    103 		printf("signal(SIGUSR1, %#llx) = %s\n",
    104 		       (unsigned long long) addr, sprintrc(rc));
    105 	} else if (rc != (long) sig_dfl) {
    106 		error_msg_and_fail("signal(SIGUSR1, %#llx) = %#lx\n",
    107 				   (unsigned long long) addr, rc);
    108 	} else {
    109 		printf("signal(SIGUSR1, %#llx) = %#lx (SIG_DFL)\n",
    110 		       (unsigned long long) addr, rc);
    111 	}
    112 
    113 	rc = k_signal(SIGUSR1, sig_ign);
    114 
    115 	if (rc == -1L) {
    116 		printf("signal(SIGUSR1, SIG_IGN) = %s\n", sprintrc(rc));
    117 	} else {
    118 		printf("signal(SIGUSR1, SIG_IGN) = %#lx\n", rc);
    119 	}
    120 
    121 	rc = k_signal(addr, sig_ign);
    122 	printf("signal(%d, SIG_IGN) = %s\n", (int) addr, sprintrc(rc));
    123 
    124 	puts("+++ exited with 0 +++");
    125 	return 0;
    126 }
    127 
    128 #else
    129 
    130 SKIP_MAIN_UNDEFINED("__NR_signal")
    131 
    132 #endif
    133