1 /* 2 * Copyright (c) Linux Test Project, 2014 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU Library General Public License for more details. 13 */ 14 /* 15 * This is a regression test for madvise(2) system call. It tests kernel 16 * for NULL ptr deref Oops fixed by: 17 * commit ee53664bda169f519ce3c6a22d378f0b946c8178 18 * Author: Kirill A. Shutemov <kirill.shutemov (at) linux.intel.com> 19 * Date: Fri Dec 20 15:10:03 2013 +0200 20 * mm: Fix NULL pointer dereference in madvise(MADV_WILLNEED) support 21 * 22 * On buggy kernel with CONFIG_TRANSPARENT_HUGEPAGE=y CONFIG_DEBUG_LOCK_ALLOC=y 23 * this testcase should produce Oops and/or be killed. On fixed/good kernel 24 * this testcase runs to completion (retcode is 0) 25 */ 26 27 #include <sys/mman.h> 28 #include <errno.h> 29 #include "tst_test.h" 30 31 #define ALLOC_SIZE (32 * 1024 * 1024) 32 33 static void verify_madvise(void) 34 { 35 void *p; 36 37 p = SAFE_MMAP(NULL, ALLOC_SIZE, PROT_READ, 38 MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE, -1, 0); 39 40 TEST(mprotect(p, ALLOC_SIZE, PROT_NONE)); 41 if (TEST_RETURN == -1) 42 tst_brk(TBROK | TTERRNO, "mprotect failed"); 43 TEST(madvise(p, ALLOC_SIZE, MADV_WILLNEED)); 44 SAFE_MUNMAP(p, ALLOC_SIZE); 45 46 if (TEST_RETURN == 0) { 47 tst_res(TPASS, "issue has not been reproduced"); 48 return; 49 } 50 51 if (TEST_ERRNO == EBADF) 52 tst_brk(TCONF, "CONFIG_SWAP=n"); 53 else 54 tst_brk(TBROK | TTERRNO, "madvise failed"); 55 } 56 57 static struct tst_test test = { 58 .tid = "madvice05", 59 .min_kver = "3.9.0", 60 .test_all = verify_madvise, 61 }; 62
