1  /*
       2   * Check decoding of kexec_file_load syscall.
       3   *
       4   * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
       5   * Copyright (c) 2016-2021 The strace developers.
       6   * All rights reserved.
       7   *
       8   * SPDX-License-Identifier: GPL-2.0-or-later
       9   */
      10  
      11  #include "tests.h"
      12  #include "scno.h"
      13  
      14  #ifdef __NR_kexec_file_load
      15  
      16  # include <inttypes.h>
      17  # include <stdio.h>
      18  # include <unistd.h>
      19  
      20  struct strval {
      21  	kernel_ulong_t val;
      22  	const char *str64;
      23  	const char *str32;
      24  	const char *str;
      25  };
      26  
      27  # define CMDLINE_STR "deadcodebaddatadefaced"
      28  
      29  int
      30  main(void)
      31  {
      32  	static const kernel_ulong_t bogus_kernel_fd =
      33  		(kernel_ulong_t) 0xdeadca57badda7a1ULL;
      34  	static const kernel_ulong_t bogus_initrd_fd =
      35  		(kernel_ulong_t) 0xdec0ded1defaced2ULL;
      36  	static const char cmdline_str[] = CMDLINE_STR;
      37  	static const char cmdline_short_str[] = "abcdef";
      38  
      39  	static const kernel_ulong_t cmdline_lens[] = {
      40  		0,
      41  		(kernel_ulong_t) 0xcaffeeeddeadbeefULL,
      42  		sizeof(cmdline_str),
      43  		sizeof(cmdline_str) - 1,
      44  		sizeof(cmdline_short_str),
      45  		sizeof(cmdline_short_str) - 1,
      46  		sizeof(cmdline_short_str) + 1,
      47  	};
      48  	static const struct strval flags[] = {
      49  		{ (kernel_ulong_t) 0xbadc0dedda7a1058ULL,
      50  			"0xbadc0ded", "0x",
      51  			"da7a1058 /* KEXEC_FILE_??? */" },
      52  		{ 0, "", "", "0" },
      53  		{ 0xdeadbeef, "", "", "KEXEC_FILE_UNLOAD|KEXEC_FILE_ON_CRASH|"
      54  			"KEXEC_FILE_NO_INITRAMFS|0xdeadbee8" },
      55  	};
      56  
      57  
      58  	long rc;
      59  	char *cmdline = tail_memdup(cmdline_str, sizeof(cmdline_str));
      60  	char *cmdline_short =
      61  		tail_memdup(cmdline_short_str, sizeof(cmdline_short_str));
      62  	char cmdline_ptr[sizeof("0x") + sizeof(void *) * 2];
      63  	char cmdline_short_ptr[sizeof("0x") + sizeof(void *) * 2];
      64  
      65  	struct strval cmdlines[] = {
      66  		{ (uintptr_t) NULL, "", "", "NULL" },
      67  		{ (uintptr_t) (cmdline + sizeof(cmdline_str)), "", "",
      68  			cmdline_ptr },
      69  		{ (uintptr_t) cmdline, "", "", "\"deadcodeb\"..." },
      70  		{ (uintptr_t) cmdline, "", "", "\"deadcodeb\"..." },
      71  		{ (uintptr_t) cmdline_short, "", "", "\"abcdef\\0\"" },
      72  		{ (uintptr_t) cmdline_short, "", "", "\"abcdef\"" },
      73  		{ (uintptr_t) cmdline_short, "", "", cmdline_short_ptr },
      74  	};
      75  
      76  
      77  	snprintf(cmdline_ptr, sizeof(cmdline_ptr), "%p",
      78  		cmdline + sizeof(cmdline_str));
      79  	snprintf(cmdline_short_ptr, sizeof(cmdline_short_ptr), "%p",
      80  		cmdline_short);
      81  
      82  	for (unsigned int i = 0; i < ARRAY_SIZE(flags); ++i) {
      83  		for (unsigned int j = 0; j < ARRAY_SIZE(cmdlines); ++j) {
      84  			rc = syscall(__NR_kexec_file_load, bogus_kernel_fd,
      85  				     bogus_initrd_fd, cmdline_lens[j],
      86  				     cmdlines[j].val, flags[i].val);
      87  			printf("kexec_file_load(%d, %d, %llu, %s, %s%s) = %s\n",
      88  			       (int) bogus_kernel_fd, (int) bogus_initrd_fd,
      89  			       (unsigned long long) cmdline_lens[j],
      90  			       cmdlines[j].str,
      91  			       sizeof(kernel_ulong_t) == 8 ? flags[i].str64 :
      92  			       flags[i].str32, flags[i].str, sprintrc(rc));
      93  		}
      94  	}
      95  
      96  	puts("+++ exited with 0 +++");
      97  
      98  	return 0;
      99  }
     100  
     101  #else
     102  
     103  SKIP_MAIN_UNDEFINED("__NR_kexec_file_load");
     104  
     105  #endif