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munmap: Change permission of VMA back to RWX on unmap

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Change-Id: Ic02098e7458dd8fa2961fb03dc32e37fb18c5dc5
Refs: #988
This commit is contained in:
Ken Sato
2019-07-26 09:25:36 +09:00
committed by Masamichi Takagi
parent c371fbf13b
commit 18412616e1
8 changed files with 465 additions and 0 deletions
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128
test/issues/988/C988.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/mman.h>
#define DEF_PROT (PROT_READ | PROT_WRITE | PROT_EXEC)
int main(void)
{
long pgsize = getpagesize();
void *ptr1, *ptr2;
int rc, ret;
printf("*** Check VMA's prot ***\n");
ptr1 = mmap(0, pgsize, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
if (ptr1 == MAP_FAILED) {
perror("mmap");
ret = -1;
goto out;
}
memset(ptr1, '1', pgsize);
printf("** mmap %p: Succeed\n", ptr1);
// Check default prot
rc = syscall(899, ptr1);
if (rc == PROT_READ | PROT_WRITE | PROT_EXEC) {
printf("[OK] default : %d\n", rc);
}
else {
printf("[NG] default : %d\n", rc);
ret = -1;
goto out;
}
// mprotec PROT_WRITE | PROT_EXEC to ptr1
rc = mprotect(ptr1, pgsize, PROT_NONE);
if (rc != 0) {
perror("mprotect");
ret = -1;
goto out;
}
rc = mprotect(ptr1, pgsize, PROT_WRITE | PROT_EXEC);
if (rc != 0) {
perror("mprotect");
ret = -1;
goto out;
}
printf("** mprotect PROT_WRITE | PROT_EXEC: Succeed\n");
// Check prot after mprotect
rc = syscall(899, ptr1);
if (rc == PROT_WRITE | PROT_EXEC) {
printf("[OK] after mprotect : %d\n", rc);
}
else {
printf("[NG] after mprotect : %d\n", rc);
ret = -1;
goto out;
}
munmap(ptr1, pgsize);
printf("** munmap %p: Done\n", ptr1);
// Check after munmap
rc = syscall(899, ptr1);
if (rc == DEF_PROT) {
printf("[OK] after munmap : %d\n", rc);
}
else {
printf("[NG] after munmap : %d\n", rc);
ret = -1;
goto out;
}
ptr2 = mmap(0, pgsize, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
if (ptr2 == MAP_FAILED) {
perror("mmap");
ret = -1;
goto out;
}
memset(ptr2, '2', pgsize);
printf("** mmap %p: Succeed\n", ptr2);
// mprotec PROT_NONE to ptr2
rc = mprotect(ptr2, pgsize, PROT_NONE);
if (rc != 0) {
perror("mprotect");
ret = -1;
goto out;
}
printf("** mprotect PROT_NONE: Succeed\n");
// Check prot after mprotect
rc = syscall(899, ptr2);
if (rc != DEF_PROT) {
printf("[OK] after mprotect : %d\n", rc);
}
else {
printf("[NG] after mprotect : %d\n", rc);
ret = -1;
goto out;
}
munmap(ptr2, pgsize);
// Check after munmap
rc = syscall(899, ptr2);
if (rc == DEF_PROT) {
printf("[OK] after munmap : %d\n", rc);
}
else {
printf("[NG] after munmap : %d\n", rc);
ret = -1;
goto out;
}
out:
if (ret != 0) {
printf("TEST_FAILED\n");
}
return ret;
}