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/** @file 410user/progs/mem_permissions.c
* @author mpa
* @brief Tests memory permissions.
* @public yes
* @for p3
* @covers vm
* @status done
*/
#include <stdio.h>
#include <stdlib.h>
#include <syscall.h>
#include "410_tests.h"
DEF_TEST_NAME("mem_permissions:");
/* forks off a task to die writing to the address */
void attempt_write(int *addr)
{
int pid, pid2, status = 333;
REPORT_LOCAL_INIT;
REPORT_FAILOUT_ON_ERR((pid = fork()));
if (pid == 0) {
*addr = 42;
REPORT_END_FAIL;
exit(42);
}
REPORT_FAILOUT_ON_ERR((pid2 = wait(&status)));
if (pid != pid2) {
report_fmt("Bad pid %d (should be %d)", pid2, pid);
REPORT_END_FAIL;
exit(42);
}
if (status >= 0) {
report_fmt("Bad status %d", status);
REPORT_END_FAIL;
exit(42);
}
report_fmt("Good: attempt_write(0x%x)", addr);
}
/* forks off a task to die reading from the address */
void attempt_read(int *addr)
{
int pid, pid2, status = 444;
REPORT_LOCAL_INIT;
REPORT_FAILOUT_ON_ERR((pid = fork()));
if (pid == 0) {
pid = *addr;
REPORT_END_FAIL;
exit(pid);
}
REPORT_FAILOUT_ON_ERR((pid2 = wait(&status)));
if (pid != pid2) {
report_fmt("Bad pid %d (should be %d)", pid2, pid);
REPORT_END_FAIL;
exit(42);
}
if (status >= 0) {
report_fmt("Bad status %d", status);
REPORT_END_FAIL;
exit(42);
}
report_fmt("Good: attempt_read(0x%x)", addr);
}
const char header[4096] = "push rodata onto its own page";
const char array[] = "constant";
const char trailer[4096] = "push other things off of rodata page";
int main()
{
REPORT_START_CMPLT;
/* try reading/writing kernel memory */
attempt_read((int *)0x500000);
attempt_write((int *)0x500000);
/* try writing rodata section */
attempt_write((int *)array);
/* try writing text secion */
attempt_write((int *)main);
REPORT_END_SUCCESS;
exit(0);
}
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