338 lines
7.1 KiB
C
338 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
/* Based on Christian Brauner's clone3() example */
|
|
|
|
#define _GNU_SOURCE
|
|
#include <errno.h>
|
|
#include <inttypes.h>
|
|
#include <linux/types.h>
|
|
#include <linux/sched.h>
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/types.h>
|
|
#include <sys/un.h>
|
|
#include <sys/wait.h>
|
|
#include <unistd.h>
|
|
#include <sched.h>
|
|
|
|
#include "../kselftest.h"
|
|
#include "clone3_selftests.h"
|
|
|
|
enum test_mode {
|
|
CLONE3_ARGS_NO_TEST,
|
|
CLONE3_ARGS_ALL_0,
|
|
CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG,
|
|
CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG,
|
|
CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG,
|
|
CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG,
|
|
};
|
|
|
|
static int call_clone3(uint64_t flags, size_t size, enum test_mode test_mode)
|
|
{
|
|
struct __clone_args args = {
|
|
.flags = flags,
|
|
.exit_signal = SIGCHLD,
|
|
};
|
|
|
|
struct clone_args_extended {
|
|
struct __clone_args args;
|
|
__aligned_u64 excess_space[2];
|
|
} args_ext;
|
|
|
|
pid_t pid = -1;
|
|
int status;
|
|
|
|
memset(&args_ext, 0, sizeof(args_ext));
|
|
if (size > sizeof(struct __clone_args))
|
|
args_ext.excess_space[1] = 1;
|
|
|
|
if (size == 0)
|
|
size = sizeof(struct __clone_args);
|
|
|
|
switch (test_mode) {
|
|
case CLONE3_ARGS_NO_TEST:
|
|
/*
|
|
* Uses default 'flags' and 'SIGCHLD'
|
|
* assignment.
|
|
*/
|
|
break;
|
|
case CLONE3_ARGS_ALL_0:
|
|
args.flags = 0;
|
|
args.exit_signal = 0;
|
|
break;
|
|
case CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG:
|
|
args.exit_signal = 0xbadc0ded00000000ULL;
|
|
break;
|
|
case CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG:
|
|
args.exit_signal = 0x0000000080000000ULL;
|
|
break;
|
|
case CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG:
|
|
args.exit_signal = 0x0000000000000100ULL;
|
|
break;
|
|
case CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG:
|
|
args.exit_signal = 0x00000000000000f0ULL;
|
|
break;
|
|
}
|
|
|
|
memcpy(&args_ext.args, &args, sizeof(struct __clone_args));
|
|
|
|
pid = sys_clone3((struct __clone_args *)&args_ext, size);
|
|
if (pid < 0) {
|
|
ksft_print_msg("%s - Failed to create new process\n",
|
|
strerror(errno));
|
|
return -errno;
|
|
}
|
|
|
|
if (pid == 0) {
|
|
ksft_print_msg("I am the child, my PID is %d\n", getpid());
|
|
_exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
ksft_print_msg("I am the parent (%d). My child's pid is %d\n",
|
|
getpid(), pid);
|
|
|
|
if (waitpid(-1, &status, __WALL) < 0) {
|
|
ksft_print_msg("Child returned %s\n", strerror(errno));
|
|
return -errno;
|
|
}
|
|
if (WEXITSTATUS(status))
|
|
return WEXITSTATUS(status);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool test_clone3(uint64_t flags, size_t size, int expected,
|
|
enum test_mode test_mode)
|
|
{
|
|
int ret;
|
|
|
|
ksft_print_msg(
|
|
"[%d] Trying clone3() with flags %#" PRIx64 " (size %zu)\n",
|
|
getpid(), flags, size);
|
|
ret = call_clone3(flags, size, test_mode);
|
|
ksft_print_msg("[%d] clone3() with flags says: %d expected %d\n",
|
|
getpid(), ret, expected);
|
|
if (ret != expected) {
|
|
ksft_print_msg(
|
|
"[%d] Result (%d) is different than expected (%d)\n",
|
|
getpid(), ret, expected);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
typedef bool (*filter_function)(void);
|
|
typedef size_t (*size_function)(void);
|
|
|
|
static bool not_root(void)
|
|
{
|
|
if (getuid() != 0) {
|
|
ksft_print_msg("Not running as root\n");
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool no_timenamespace(void)
|
|
{
|
|
if (not_root())
|
|
return true;
|
|
|
|
if (!access("/proc/self/ns/time", F_OK))
|
|
return false;
|
|
|
|
ksft_print_msg("Time namespaces are not supported\n");
|
|
return true;
|
|
}
|
|
|
|
static size_t page_size_plus_8(void)
|
|
{
|
|
return getpagesize() + 8;
|
|
}
|
|
|
|
struct test {
|
|
const char *name;
|
|
uint64_t flags;
|
|
size_t size;
|
|
size_function size_function;
|
|
int expected;
|
|
enum test_mode test_mode;
|
|
filter_function filter;
|
|
};
|
|
|
|
static const struct test tests[] = {
|
|
{
|
|
.name = "simple clone3()",
|
|
.flags = 0,
|
|
.size = 0,
|
|
.expected = 0,
|
|
.test_mode = CLONE3_ARGS_NO_TEST,
|
|
},
|
|
{
|
|
.name = "clone3() in a new PID_NS",
|
|
.flags = CLONE_NEWPID,
|
|
.size = 0,
|
|
.expected = 0,
|
|
.test_mode = CLONE3_ARGS_NO_TEST,
|
|
.filter = not_root,
|
|
},
|
|
{
|
|
.name = "CLONE_ARGS_SIZE_VER0",
|
|
.flags = 0,
|
|
.size = CLONE_ARGS_SIZE_VER0,
|
|
.expected = 0,
|
|
.test_mode = CLONE3_ARGS_NO_TEST,
|
|
},
|
|
{
|
|
.name = "CLONE_ARGS_SIZE_VER0 - 8",
|
|
.flags = 0,
|
|
.size = CLONE_ARGS_SIZE_VER0 - 8,
|
|
.expected = -EINVAL,
|
|
.test_mode = CLONE3_ARGS_NO_TEST,
|
|
},
|
|
{
|
|
.name = "sizeof(struct clone_args) + 8",
|
|
.flags = 0,
|
|
.size = sizeof(struct __clone_args) + 8,
|
|
.expected = 0,
|
|
.test_mode = CLONE3_ARGS_NO_TEST,
|
|
},
|
|
{
|
|
.name = "exit_signal with highest 32 bits non-zero",
|
|
.flags = 0,
|
|
.size = 0,
|
|
.expected = -EINVAL,
|
|
.test_mode = CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG,
|
|
},
|
|
{
|
|
.name = "negative 32-bit exit_signal",
|
|
.flags = 0,
|
|
.size = 0,
|
|
.expected = -EINVAL,
|
|
.test_mode = CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG,
|
|
},
|
|
{
|
|
.name = "exit_signal not fitting into CSIGNAL mask",
|
|
.flags = 0,
|
|
.size = 0,
|
|
.expected = -EINVAL,
|
|
.test_mode = CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG,
|
|
},
|
|
{
|
|
.name = "NSIG < exit_signal < CSIG",
|
|
.flags = 0,
|
|
.size = 0,
|
|
.expected = -EINVAL,
|
|
.test_mode = CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG,
|
|
},
|
|
{
|
|
.name = "Arguments sizeof(struct clone_args) + 8",
|
|
.flags = 0,
|
|
.size = sizeof(struct __clone_args) + 8,
|
|
.expected = 0,
|
|
.test_mode = CLONE3_ARGS_ALL_0,
|
|
},
|
|
{
|
|
.name = "Arguments sizeof(struct clone_args) + 16",
|
|
.flags = 0,
|
|
.size = sizeof(struct __clone_args) + 16,
|
|
.expected = -E2BIG,
|
|
.test_mode = CLONE3_ARGS_ALL_0,
|
|
},
|
|
{
|
|
.name = "Arguments sizeof(struct clone_arg) * 2",
|
|
.flags = 0,
|
|
.size = sizeof(struct __clone_args) + 16,
|
|
.expected = -E2BIG,
|
|
.test_mode = CLONE3_ARGS_ALL_0,
|
|
},
|
|
{
|
|
.name = "Arguments > page size",
|
|
.flags = 0,
|
|
.size_function = page_size_plus_8,
|
|
.expected = -E2BIG,
|
|
.test_mode = CLONE3_ARGS_NO_TEST,
|
|
},
|
|
{
|
|
.name = "CLONE_ARGS_SIZE_VER0 in a new PID NS",
|
|
.flags = CLONE_NEWPID,
|
|
.size = CLONE_ARGS_SIZE_VER0,
|
|
.expected = 0,
|
|
.test_mode = CLONE3_ARGS_NO_TEST,
|
|
.filter = not_root,
|
|
},
|
|
{
|
|
.name = "CLONE_ARGS_SIZE_VER0 - 8 in a new PID NS",
|
|
.flags = CLONE_NEWPID,
|
|
.size = CLONE_ARGS_SIZE_VER0 - 8,
|
|
.expected = -EINVAL,
|
|
.test_mode = CLONE3_ARGS_NO_TEST,
|
|
},
|
|
{
|
|
.name = "sizeof(struct clone_args) + 8 in a new PID NS",
|
|
.flags = CLONE_NEWPID,
|
|
.size = sizeof(struct __clone_args) + 8,
|
|
.expected = 0,
|
|
.test_mode = CLONE3_ARGS_NO_TEST,
|
|
.filter = not_root,
|
|
},
|
|
{
|
|
.name = "Arguments > page size in a new PID NS",
|
|
.flags = CLONE_NEWPID,
|
|
.size_function = page_size_plus_8,
|
|
.expected = -E2BIG,
|
|
.test_mode = CLONE3_ARGS_NO_TEST,
|
|
},
|
|
{
|
|
.name = "New time NS",
|
|
.flags = CLONE_NEWTIME,
|
|
.size = 0,
|
|
.expected = 0,
|
|
.test_mode = CLONE3_ARGS_NO_TEST,
|
|
.filter = no_timenamespace,
|
|
},
|
|
{
|
|
.name = "exit signal (SIGCHLD) in flags",
|
|
.flags = SIGCHLD,
|
|
.size = 0,
|
|
.expected = -EINVAL,
|
|
.test_mode = CLONE3_ARGS_NO_TEST,
|
|
},
|
|
};
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
size_t size;
|
|
int i;
|
|
|
|
ksft_print_header();
|
|
ksft_set_plan(ARRAY_SIZE(tests));
|
|
test_clone3_supported();
|
|
|
|
for (i = 0; i < ARRAY_SIZE(tests); i++) {
|
|
if (tests[i].filter && tests[i].filter()) {
|
|
ksft_test_result_skip("%s\n", tests[i].name);
|
|
continue;
|
|
}
|
|
|
|
if (tests[i].size_function)
|
|
size = tests[i].size_function();
|
|
else
|
|
size = tests[i].size;
|
|
|
|
ksft_print_msg("Running test '%s'\n", tests[i].name);
|
|
|
|
ksft_test_result(test_clone3(tests[i].flags, size,
|
|
tests[i].expected,
|
|
tests[i].test_mode),
|
|
"%s\n", tests[i].name);
|
|
}
|
|
|
|
ksft_finished();
|
|
}
|