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t_backtrace_sandbox.c revision 1.3 
      1 /*	$NetBSD: t_backtrace_sandbox.c,v 1.3 2025/01/30 16:13:51 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2025 Kyle Evans <kevans (at) FreeBSD.org>
      5  *
      6  * SPDX-License-Identifier: BSD-2-Clause
      7  */
      8 #include <sys/cdefs.h>
      9 __RCSID("$NetBSD: t_backtrace_sandbox.c,v 1.3 2025/01/30 16:13:51 christos Exp $");
     10 
     11 #include <sys/param.h>
     12 #include <sys/wait.h>
     13 #ifdef __FreeBSD__
     14 #include <sys/capsicum.h>
     15 #define __arraycount(a) nitems(a)
     16 #endif
     17 
     18 #include <execinfo.h>
     19 #include <signal.h>
     20 #include <stdio.h>
     21 #include <string.h>
     22 #include <stdlib.h>
     23 #include <unistd.h>
     24 
     25 #include <atf-c.h>
     26 
     27 #define	BT_FUNCTIONS		10
     28 
     29 ATF_TC(backtrace_sandbox);
     30 ATF_TC_HEAD(backtrace_sandbox, tc)
     31 {
     32         atf_tc_set_md_var(tc, "descr",
     33 	    "Test backtrace_sandbox_init(3) in sandbox");
     34 #ifndef __FreeBSD__
     35 	atf_tc_set_md_var(tc, "require.user", "root");
     36 #endif
     37 }
     38 
     39 ATF_TC_BODY(backtrace_sandbox, tc)
     40 {
     41 	void *addr[BT_FUNCTIONS];
     42 	char **syms;
     43 	size_t frames;
     44 	pid_t pid;
     45 	int status;
     46 
     47 	frames = backtrace(addr, __arraycount(addr));
     48 	ATF_REQUIRE(frames > 0);
     49 
     50 	syms = backtrace_symbols_fmt(addr, frames, "%n");
     51 	ATF_REQUIRE(strcmp(syms[0], "atfu_backtrace_sandbox_body") == 0);
     52 
     53 	pid = fork();
     54 	ATF_REQUIRE(pid >= 0);
     55 
     56 	if (pid == 0) {
     57 
     58 		backtrace_sandbox_init();
     59 #ifdef __FreeBSD__
     60 		cap_enter();
     61 #else
     62 		if (chroot("/tmp") != 0)
     63 			_exit(EXIT_FAILURE);
     64 #endif
     65 
     66 		syms = backtrace_symbols_fmt(addr, frames, "%n");
     67 		if (strcmp(syms[0], "atfu_backtrace_sandbox_body") != 0)
     68 			_exit(EXIT_FAILURE);
     69 
     70 		backtrace_sandbox_fini();
     71 
     72 		_exit(EXIT_SUCCESS);
     73 	}
     74 
     75 	(void)wait(&status);
     76 
     77 	if (!WIFEXITED(status) || WEXITSTATUS(status) != EXIT_SUCCESS)
     78 		atf_tc_fail("resolving symbols in chroot failed");
     79 
     80 }
     81 
     82 ATF_TP_ADD_TCS(tp)
     83 {
     84 
     85 	ATF_TP_ADD_TC(tp, backtrace_sandbox);
     86 
     87 	return atf_no_error();
     88 }
     89