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/*
* Check decoding of landlock_add_rule 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 <inttypes.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <linux/landlock.h>
#ifndef SKIP_IF_PROC_IS_UNAVAILABLE
# define SKIP_IF_PROC_IS_UNAVAILABLE
#endif
#ifndef FD0_STR
# define FD0_STR ""
#endif
#ifndef RULESET_FD
# define RULESET_FD -1
#endif
#ifndef RULESET_FD_STR
# define RULESET_FD_STR "-1"
#endif
#ifndef PARENT_FD
# define PARENT_FD -1
#endif
#ifndef PARENT_FD_STR
# define PARENT_FD_STR "-1"
#endif
static const char *errstr;
static long
sys_landlock_add_rule(int ruleset_fd, unsigned int rule_type, void *rule_attr,
unsigned int flags)
{
static const kernel_ulong_t fill =
(kernel_ulong_t) 0xd1efaced00000000ULL;
kernel_ulong_t arg1 = fill | (unsigned int) ruleset_fd;
kernel_ulong_t arg2 = fill | rule_type;
kernel_ulong_t arg3 = (uintptr_t) rule_attr;
kernel_ulong_t arg4 = fill | flags;
kernel_ulong_t arg5 = fill | 0xdecaffed;
kernel_ulong_t arg6 = fill | 0xdeefaced;
long rc = syscall(__NR_landlock_add_rule,
arg1, arg2, arg3, arg4, arg5, arg6);
errstr = sprintrc(rc);
return rc;
}
int
main(void)
{
SKIP_IF_PROC_IS_UNAVAILABLE;
TAIL_ALLOC_OBJECT_VAR_PTR(struct landlock_path_beneath_attr, attr);
/* All zeroes */
sys_landlock_add_rule(0, 0, NULL, 0);
printf("landlock_add_rule(0" FD0_STR ", 0 /* LANDLOCK_RULE_??? */"
", NULL, 0) = %s\n", errstr);
/* Bogus values */
sys_landlock_add_rule(0xdeadc0de, 0xfacebeef, attr + 1, 1);
printf("landlock_add_rule(-559038242"
", 0xfacebeef /* LANDLOCK_RULE_??? */, %p, 0x1) = %s\n",
attr + 1, errstr);
sys_landlock_add_rule(1729, 2, attr + 1, 0xffffffff);
printf("landlock_add_rule(1729, 0x2 /* LANDLOCK_RULE_??? */, %p"
", 0xffffffff) = %s\n",
attr + 1, errstr);
/* Invalid pointer */
sys_landlock_add_rule(RULESET_FD, LANDLOCK_RULE_PATH_BENEATH,
attr + 1, 0);
printf("landlock_add_rule(" RULESET_FD_STR
", LANDLOCK_RULE_PATH_BENEATH, %p, 0) = %s\n",
attr + 1, errstr);
/* Short read */
sys_landlock_add_rule(RULESET_FD, LANDLOCK_RULE_PATH_BENEATH,
(char *) attr + 4, 0);
printf("landlock_add_rule(" RULESET_FD_STR
", LANDLOCK_RULE_PATH_BENEATH, %p, 0) = %s\n",
(char *) attr + 4, errstr);
/* 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 struct {
int val;
const char *str;
} parent_fd_vals[] = {
{ ARG_STR(-1) },
{ ARG_STR(11630) },
{ PARENT_FD, PARENT_FD_STR },
};
for (size_t i = 0; i < ARRAY_SIZE(attr_vals); i++) {
for (size_t j = 0; j < ARRAY_SIZE(parent_fd_vals); j++) {
attr->allowed_access = attr_vals[i].val;
attr->parent_fd = parent_fd_vals[j].val;
sys_landlock_add_rule(RULESET_FD,
LANDLOCK_RULE_PATH_BENEATH,
attr, 0);
printf("landlock_add_rule(" RULESET_FD_STR
", LANDLOCK_RULE_PATH_BENEATH"
", {allowed_access=%s, parent_fd=%s}, 0) = %s\n",
attr_vals[i].str, parent_fd_vals[j].str, errstr);
}
}
puts("+++ exited with 0 +++");
return 0;
}
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