1 /* 2 * Check decoding of kexec_file_load syscall. 3 * 4 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr (at) gmail.com> 5 * Copyright (c) 2016-2017 The strace developers. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "tests.h" 32 #include <asm/unistd.h> 33 #include "scno.h" 34 35 #ifdef __NR_kexec_file_load 36 37 # include <inttypes.h> 38 # include <stdio.h> 39 # include <unistd.h> 40 41 struct strval { 42 kernel_ulong_t val; 43 const char *str64; 44 const char *str32; 45 const char *str; 46 }; 47 48 #define CMDLINE_STR "deadcodebaddatadefaced" 49 50 int 51 main(void) 52 { 53 static const kernel_ulong_t bogus_kernel_fd = 54 (kernel_ulong_t) 0xdeadca57badda7a1ULL; 55 static const kernel_ulong_t bogus_initrd_fd = 56 (kernel_ulong_t) 0xdec0ded1defaced2ULL; 57 static const char cmdline_str[] = CMDLINE_STR; 58 static const char cmdline_short_str[] = "abcdef"; 59 60 static const kernel_ulong_t cmdline_lens[] = { 61 0, 62 (kernel_ulong_t) 0xcaffeeeddeadbeefULL, 63 sizeof(cmdline_str), 64 sizeof(cmdline_str) - 1, 65 sizeof(cmdline_short_str), 66 sizeof(cmdline_short_str) - 1, 67 sizeof(cmdline_short_str) + 1, 68 }; 69 static const struct strval flags[] = { 70 { (kernel_ulong_t) 0xbadc0dedda7a1058ULL, 71 "0xbadc0ded", "0x", 72 "da7a1058 /* KEXEC_FILE_??? */" }, 73 { 0, "", "", "0" }, 74 { 0xdeadbeef, "", "", "KEXEC_FILE_UNLOAD|KEXEC_FILE_ON_CRASH|" 75 "KEXEC_FILE_NO_INITRAMFS|0xdeadbee8" }, 76 }; 77 78 79 long rc; 80 char *cmdline = tail_memdup(cmdline_str, sizeof(cmdline_str)); 81 char *cmdline_short = 82 tail_memdup(cmdline_short_str, sizeof(cmdline_short_str)); 83 char cmdline_ptr[sizeof("0x") + sizeof(void *) * 2]; 84 char cmdline_short_ptr[sizeof("0x") + sizeof(void *) * 2]; 85 unsigned int i; 86 unsigned int j; 87 88 struct strval cmdlines[] = { 89 { (uintptr_t) NULL, "", "", "NULL" }, 90 { (uintptr_t) (cmdline + sizeof(cmdline_str)), "", "", 91 cmdline_ptr }, 92 { (uintptr_t) cmdline, "", "", "\"deadcodeb\"..." }, 93 { (uintptr_t) cmdline, "", "", "\"deadcodeb\"..." }, 94 { (uintptr_t) cmdline_short, "", "", "\"abcdef\\0\"" }, 95 { (uintptr_t) cmdline_short, "", "", "\"abcdef\"" }, 96 { (uintptr_t) cmdline_short, "", "", cmdline_short_ptr }, 97 }; 98 99 100 snprintf(cmdline_ptr, sizeof(cmdline_ptr), "%p", 101 cmdline + sizeof(cmdline_str)); 102 snprintf(cmdline_short_ptr, sizeof(cmdline_short_ptr), "%p", 103 cmdline_short); 104 105 for (i = 0; i < ARRAY_SIZE(flags); i++) { 106 for (j = 0; j < ARRAY_SIZE(cmdlines); j++) { 107 rc = syscall(__NR_kexec_file_load, bogus_kernel_fd, 108 bogus_initrd_fd, cmdline_lens[j], 109 cmdlines[j].val, flags[i].val); 110 printf("kexec_file_load(%d, %d, %llu, %s, %s%s) = %s\n", 111 (int) bogus_kernel_fd, (int) bogus_initrd_fd, 112 (unsigned long long) cmdline_lens[j], 113 cmdlines[j].str, 114 sizeof(kernel_ulong_t) == 8 ? flags[i].str64 : 115 flags[i].str32, flags[i].str, sprintrc(rc)); 116 } 117 } 118 119 puts("+++ exited with 0 +++"); 120 121 return 0; 122 } 123 124 #else 125 126 SKIP_MAIN_UNDEFINED("__NR_kexec_file_load"); 127 128 #endif 129
