124 lines
2.6 KiB
C
124 lines
2.6 KiB
C
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// SPDX-License-Identifier: LGPL-2.1-or-later
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/*
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* Copyright (C) 2013 LG Electronics.
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* Author: Joonsoo Kim
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*/
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/*\
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* [Description]
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*
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* Test to preserve a reserved page against no-reserved mapping. If all
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* hugepages are reserved, access to no-reserved shared mapping cause a
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* process die, instead of stealing a hugepage which is reserved for other
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* process.
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*/
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#include <setjmp.h>
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#include "hugetlb.h"
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#define MNTPOINT "hugetlbfs/"
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static long hpage_size;
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static int fd1 = -1, fd2 = -1;
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static sigjmp_buf sig_escape;
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static void *sig_expected = MAP_FAILED;
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static void sig_handler(int signum, siginfo_t *si, void *uc)
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{
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(void)uc;
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if (signum == SIGBUS) {
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if (si->si_addr == sig_expected)
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siglongjmp(sig_escape, 1);
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tst_res(TFAIL, "SIGBUS somewhere unexpected: %p (expected: %p)",
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si->si_addr, sig_expected);
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} else {
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tst_res(TFAIL, "Unexpected signal %s", strsignal(signum));
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}
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}
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static int test_write(void *p)
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{
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volatile char *pl = p;
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if (sigsetjmp(sig_escape, 1)) {
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/* We got a SIGBUS */
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return 1;
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}
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sig_expected = p;
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barrier();
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*pl = 's';
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return 0;
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}
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static void run_test(void)
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{
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int nr_hugepages;
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int surp_hugepages;
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int ret;
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char *p, *q;
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struct sigaction sa = {
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.sa_sigaction = sig_handler,
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.sa_flags = SA_SIGINFO,
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};
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nr_hugepages = SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE);
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SAFE_SIGACTION(SIGBUS, &sa, NULL);
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p = SAFE_MMAP(NULL, hpage_size * nr_hugepages,
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PROT_READ | PROT_WRITE, MAP_SHARED, fd1, 0);
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tst_res(TINFO, "Reserve all hugepages %d", nr_hugepages);
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q = SAFE_MMAP(NULL, hpage_size,
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PROT_READ | PROT_WRITE, MAP_SHARED | MAP_NORESERVE, fd2, 0);
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tst_res(TINFO, "Write to %p to steal reserved page", q);
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surp_hugepages = SAFE_READ_MEMINFO(MEMINFO_HPAGE_SURP);
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ret = test_write(q);
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if (ret == 1) {
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tst_res(TPASS, "Successful with SIGSEGV received");
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goto cleanup;
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}
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/* Provisioning succeeded because of overcommit */
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if (SAFE_READ_MEMINFO(MEMINFO_HPAGE_SURP) ==
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surp_hugepages + 1) {
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tst_res(TPASS, "Successful because of surplus pages");
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goto cleanup;
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}
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tst_res(TFAIL, "Steal reserved page");
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cleanup:
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SAFE_MUNMAP(p, hpage_size * nr_hugepages);
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SAFE_MUNMAP(q, hpage_size);
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}
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static void setup(void)
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{
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hpage_size = tst_get_hugepage_size();
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fd1 = tst_creat_unlinked(MNTPOINT, 0);
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fd2 = tst_creat_unlinked(MNTPOINT, 0);
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}
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static void cleanup(void)
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{
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if (fd1 >= 0)
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SAFE_CLOSE(fd1);
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if (fd2 >= 0)
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SAFE_CLOSE(fd2);
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}
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static struct tst_test test = {
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.needs_root = 1,
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.mntpoint = MNTPOINT,
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.needs_hugetlbfs = 1,
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.needs_tmpdir = 1,
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.setup = setup,
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.cleanup = cleanup,
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.test_all = run_test,
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.hugepages = {2, TST_NEEDS},
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};
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