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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/tests/sys/vm/stack/stack_mprotect_exec_test.c
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/*-

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 * Copyright (c) 2023 Dmitry Chagin <[email protected]>

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 *

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 * SPDX-License-Identifier: BSD-2-Clause

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 *

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 * PR:	272585

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 * Test provided by John F. Carr

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 */

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#include <sys/systm.h>

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#include <sys/mman.h>

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#include <vm/vm_param.h>

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#include <atf-c.h>

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#include <signal.h>

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#include <unistd.h>

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static void

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sigsegv_handler(int sig __unused)

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{

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	atf_tc_fail("Invalid stack protection mode after grows");

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}

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ATF_TC_WITHOUT_HEAD(mprotect_exec_test);

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ATF_TC_BODY(mprotect_exec_test, tc)

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{

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	long pagesize;

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	char *addr, *guard;

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	size_t alloc_size;

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	signal(SIGSEGV, sigsegv_handler);

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	pagesize = sysconf(_SC_PAGESIZE);

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	ATF_REQUIRE(pagesize > 0);

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	alloc_size = SGROWSIZ * 2;

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	addr = mmap(NULL, alloc_size, PROT_READ | PROT_WRITE,

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	    MAP_STACK | MAP_PRIVATE | MAP_ANON, -1, 0);

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	ATF_REQUIRE(addr != MAP_FAILED);

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	/*

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	 * Change prot of the last page in the mmaped stack area.

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	 */

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	guard = addr + alloc_size - SGROWSIZ;

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	ATF_REQUIRE(mprotect(guard, pagesize, PROT_NONE) == 0);

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	((volatile char *)guard)[-1];

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}

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ATF_TP_ADD_TCS(tp)

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{

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	ATF_TP_ADD_TC(tp, mprotect_exec_test);

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	return (atf_no_error());

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}

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