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/*
* Check decoding of landlock_create_ruleset syscall.
*
* Copyright (c) 2021 Eugene Syromyatnikov <evgsyr@gmail.com>
* Copyright (c) 2021-2022 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include "xmalloc.h"
#include <inttypes.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/landlock.h>
#ifndef RETVAL_INJECTED
# define RETVAL_INJECTED 0
#endif
#ifndef DECODE_FD
# define DECODE_FD 0
#endif
#ifndef SKIP_IF_PROC_IS_UNAVAILABLE
# define SKIP_IF_PROC_IS_UNAVAILABLE
#endif
#ifndef FD_PATH
# define FD_PATH ""
#endif
#if RETVAL_INJECTED
# define INJ_STR " (INJECTED)\n"
# define INJ_FD_STR FD_PATH " (INJECTED)\n"
#else /* !RETVAL_INJECTED */
# define INJ_STR "\n"
# define INJ_FD_STR "\n"
#endif /* RETVAL_INJECTED */
static const char *errstr;
static long
sys_landlock_create_ruleset(struct landlock_ruleset_attr *attr,
kernel_ulong_t size, unsigned int flags)
{
static const kernel_ulong_t fill =
(kernel_ulong_t) 0xd1efaced00000000ULL;
kernel_ulong_t arg1 = (uintptr_t) attr;
kernel_ulong_t arg2 = size;
kernel_ulong_t arg3 = fill | flags;
kernel_ulong_t arg4 = fill | 0xbadbeefd;
kernel_ulong_t arg5 = fill | 0xdecaffed;
kernel_ulong_t arg6 = fill | 0xdeefaced;
long rc = syscall(__NR_landlock_create_ruleset,
arg1, arg2, arg3, arg4, arg5, arg6);
errstr = sprintrc(rc);
return rc;
}
int
main(void)
{
static const kernel_ulong_t bogus_size =
(kernel_ulong_t) 0xbadfaceddecaffee;
SKIP_IF_PROC_IS_UNAVAILABLE;
TAIL_ALLOC_OBJECT_VAR_PTR(struct landlock_ruleset_attr, attr);
long rc;
/* All zeroes */
rc = sys_landlock_create_ruleset(NULL, 0, 0);
printf("landlock_create_ruleset(NULL, 0, 0) = %s" INJ_FD_STR,
errstr);
/* Get ABI version */
rc = sys_landlock_create_ruleset(NULL, 0, 1);
printf("landlock_create_ruleset(NULL, 0"
", LANDLOCK_CREATE_RULESET_VERSION) = %s" INJ_STR, errstr);
/* ilp32 check */
rc = syscall(__NR_landlock_create_ruleset,
(kernel_ulong_t) 0xffFFffFF00000000,
(kernel_ulong_t) 0xdefeededdeadface,
(kernel_ulong_t) 0xbadc0dedbadfaced);
printf("landlock_create_ruleset("
#if SIZEOF_KERNEL_LONG_T > 4
"%#llx"
#else
"NULL"
#endif
", %llu, LANDLOCK_CREATE_RULESET_VERSION|%#x) = %s" INJ_STR,
#if SIZEOF_KERNEL_LONG_T > 4
(unsigned long long) (kernel_ulong_t) 0xffFFffFF00000000,
#endif
(unsigned long long) (kernel_ulong_t) 0xdefeededdeadface,
0xbadfacec, sprintrc(rc));
/* Bogus addr, size, flags */
rc = sys_landlock_create_ruleset(attr + 1, bogus_size, 0xbadcaffe);
printf("landlock_create_ruleset(%p, %llu"
", 0xbadcaffe /* LANDLOCK_CREATE_RULESET_??? */) = %s"
INJ_FD_STR,
attr + 1, (unsigned long long) bogus_size, errstr);
/* Size is too small */
for (size_t i = 0; i < 8; i++) {
rc = sys_landlock_create_ruleset(attr, i, 0);
printf("landlock_create_ruleset(%p, %zu, 0) = %s" INJ_FD_STR,
attr, i, errstr);
}
/* Perform syscalls with valid attr ptr */
static const struct {
uint64_t val;
const char *str;
} attr_vals[] = {
{ ARG_STR(LANDLOCK_ACCESS_FS_EXECUTE) },
{ ARG_ULL_STR(LANDLOCK_ACCESS_FS_EXECUTE|LANDLOCK_ACCESS_FS_READ_FILE|LANDLOCK_ACCESS_FS_READ_DIR|LANDLOCK_ACCESS_FS_REMOVE_FILE|LANDLOCK_ACCESS_FS_MAKE_CHAR|LANDLOCK_ACCESS_FS_MAKE_DIR|LANDLOCK_ACCESS_FS_MAKE_SOCK|LANDLOCK_ACCESS_FS_MAKE_FIFO|LANDLOCK_ACCESS_FS_MAKE_BLOCK|LANDLOCK_ACCESS_FS_MAKE_SYM|LANDLOCK_ACCESS_FS_REFER|0xdebeefeddecac000) },
{ ARG_ULL_STR(0xdebeefeddecac000)
" /* LANDLOCK_ACCESS_FS_??? */" },
};
static const kernel_ulong_t sizes[] = { 8, 12, 16 };
for (size_t i = 0; i < ARRAY_SIZE(attr_vals); i++) {
for (size_t j = 0; j < ARRAY_SIZE(sizes); j++) {
const char *fd_str = FD_PATH;
attr->handled_access_fs = attr_vals[i].val;
rc = sys_landlock_create_ruleset(attr, sizes[j], 0);
#if DECODE_FD
/*
* The ABI has been broken in commit v5.18-rc1~88^2
* by adding brackets to the link value, hence, we can't
* rely on a specific name anymore and have to fetch it
* ourselves.
*/
if (rc >= 0) {
static char buf[256];
char *path = xasprintf("/proc/self/fd/%ld", rc);
ssize_t ret = readlink(path, buf + 1,
sizeof(buf) - 3);
free(path);
if (ret >= 0) {
buf[0] = '<';
buf[ret + 1] = '>';
buf[ret + 2] = '\0';
fd_str = buf;
}
}
#endif
printf("landlock_create_ruleset({handled_access_fs=%s"
"%s}, %llu, 0) = %s%s" INJ_STR,
attr_vals[i].str,
sizes[j] > sizeof(*attr) ? ", ..." : "",
(unsigned long long) sizes[j],
errstr, rc >= 0 ? fd_str : "");
}
}
puts("+++ exited with 0 +++");
return 0;
}
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