100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2016 Richard Palethorpe <richiejp@f-m.fm>
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*/
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/*
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* Check that accessing a page marked with MADV_HWPOISON results in SIGBUS.
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*
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* Test flow: create child process,
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* map and write to memory,
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* mark memory with MADV_HWPOISON,
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* access memory,
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* if SIGBUS is delivered to child the test passes else it fails
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*
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* If the underlying page type of the memory we have mapped does not support
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* poisoning then the test will fail. We try to map and write to the memory in
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* such a way that by the time madvise is called the virtual memory address
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* points to a supported page. However there may be some rare circumstances
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* where the test produces the wrong result because we have somehow obtained
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* an unsupported page. In such cases madvise will probably return success,
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* but no SIGBUS will be produced.
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*
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* For more information see <linux source>/Documentation/vm/hwpoison.txt.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/wait.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <signal.h>
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#include <errno.h>
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#include <string.h>
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#include "tst_test.h"
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#include "lapi/mmap.h"
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static void run_child(void)
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{
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const size_t msize = getpagesize();
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void *mem = NULL;
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tst_res(TINFO,
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"mmap(0, %zu, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)",
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msize);
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mem = SAFE_MMAP(NULL,
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msize,
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PROT_READ | PROT_WRITE,
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MAP_ANONYMOUS | MAP_PRIVATE,
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-1,
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0);
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memset(mem, 'L', msize);
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tst_res(TINFO, "madvise(%p, %zu, MADV_HWPOISON)", mem, msize);
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if (madvise(mem, msize, MADV_HWPOISON) == -1) {
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if (errno == EINVAL) {
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tst_res(TCONF | TERRNO,
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"CONFIG_MEMORY_FAILURE probably not set in kconfig");
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} else {
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tst_res(TFAIL | TERRNO, "Could not poison memory");
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}
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exit(0);
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}
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*((char *)mem) = 'd';
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tst_res(TFAIL, "Did not receive SIGBUS on accessing poisoned page");
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}
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static void run(void)
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{
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int status;
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pid_t pid;
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pid = SAFE_FORK();
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if (pid == 0) {
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run_child();
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exit(0);
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}
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SAFE_WAITPID(pid, &status, 0);
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if (WIFSIGNALED(status) && WTERMSIG(status) == SIGBUS) {
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tst_res(TPASS, "Received SIGBUS after accessing poisoned page");
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return;
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}
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
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return;
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tst_res(TFAIL, "Child %s", tst_strstatus(status));
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}
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static struct tst_test test = {
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.test_all = run,
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.min_kver = "2.6.31",
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.needs_root = 1,
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.forks_child = 1
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};
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