mirror of https://gitee.com/openkylin/linux.git
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* syscall_arg_fault.c - tests faults 32-bit fast syscall stack args
|
|
* Copyright (c) 2018 Andrew Lutomirski
|
|
*/
|
|
|
|
#define _GNU_SOURCE
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <stdbool.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <syscall.h>
|
|
|
|
static int nerrs;
|
|
|
|
#define X32_BIT 0x40000000UL
|
|
|
|
static void check_enosys(unsigned long nr, bool *ok)
|
|
{
|
|
/* If this fails, a segfault is reasonably likely. */
|
|
fflush(stdout);
|
|
|
|
long ret = syscall(nr, 0, 0, 0, 0, 0, 0);
|
|
if (ret == 0) {
|
|
printf("[FAIL]\tsyscall %lu succeeded, but it should have failed\n", nr);
|
|
*ok = false;
|
|
} else if (errno != ENOSYS) {
|
|
printf("[FAIL]\tsyscall %lu had error code %d, but it should have reported ENOSYS\n", nr, errno);
|
|
*ok = false;
|
|
}
|
|
}
|
|
|
|
static void test_x32_without_x32_bit(void)
|
|
{
|
|
bool ok = true;
|
|
|
|
/*
|
|
* Syscalls 512-547 are "x32" syscalls. They are intended to be
|
|
* called with the x32 (0x40000000) bit set. Calling them without
|
|
* the x32 bit set is nonsense and should not work.
|
|
*/
|
|
printf("[RUN]\tChecking syscalls 512-547\n");
|
|
for (int i = 512; i <= 547; i++)
|
|
check_enosys(i, &ok);
|
|
|
|
/*
|
|
* Check that a handful of 64-bit-only syscalls are rejected if the x32
|
|
* bit is set.
|
|
*/
|
|
printf("[RUN]\tChecking some 64-bit syscalls in x32 range\n");
|
|
check_enosys(16 | X32_BIT, &ok); /* ioctl */
|
|
check_enosys(19 | X32_BIT, &ok); /* readv */
|
|
check_enosys(20 | X32_BIT, &ok); /* writev */
|
|
|
|
/*
|
|
* Check some syscalls with high bits set.
|
|
*/
|
|
printf("[RUN]\tChecking numbers above 2^32-1\n");
|
|
check_enosys((1UL << 32), &ok);
|
|
check_enosys(X32_BIT | (1UL << 32), &ok);
|
|
|
|
if (!ok)
|
|
nerrs++;
|
|
else
|
|
printf("[OK]\tThey all returned -ENOSYS\n");
|
|
}
|
|
|
|
int main()
|
|
{
|
|
/*
|
|
* Anyone diagnosing a failure will want to know whether the kernel
|
|
* supports x32. Tell them.
|
|
*/
|
|
printf("\tChecking for x32...");
|
|
fflush(stdout);
|
|
if (syscall(39 | X32_BIT, 0, 0, 0, 0, 0, 0) >= 0) {
|
|
printf(" supported\n");
|
|
} else if (errno == ENOSYS) {
|
|
printf(" not supported\n");
|
|
} else {
|
|
printf(" confused\n");
|
|
}
|
|
|
|
test_x32_without_x32_bit();
|
|
|
|
return nerrs ? 1 : 0;
|
|
}
|