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procfs: Make /proc/<PID>/mem unwritable

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refs: #1177
Change-Id: Ibb319221155547febf9126e05a9e322bd9f140cc
This commit is contained in:
Ken Sato
2018-09-25 10:05:41 +09:00
committed by Masamichi Takagi
parent cc1d39e55d
commit 6f9fef2b13
6 changed files with 22 additions and 152 deletions
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45
test/issues/1018/CT_002.c
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@@ -19,58 +19,21 @@
int main(int argc, char *argv[])
{
int fd = 0, i = 0;
int fd = 0;
pid_t pid = getpid();
char pfname[PROCFILE_LEN];
unsigned long *anon_map = NULL;
unsigned long *tmp_buf = NULL;
int data_pos[3] = {0 * MEGA / sizeof(unsigned long),
1 * MEGA / sizeof(unsigned long),
4 * MEGA / sizeof(unsigned long)};
off_t ret = 0;
printf("*** %s start *******************************\n", TEST_NAME);
/* anonymous mmap */
anon_map = (unsigned long *)mmap(NULL, MAP_LEN, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
OKNG(anon_map == MAP_FAILED, "anonymous map");
printf(" anonymous map to %p, size:%.2f MB\n",
anon_map, (double)MAP_LEN / MEGA);
/* allocate tmp_buf */
tmp_buf = (unsigned long *)mmap(NULL, MAP_LEN, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
CHKANDJUMP(tmp_buf == MAP_FAILED, "alloc tmp_buf");
/* set magic_number */
tmp_buf[data_pos[0]] = 0x1111;
tmp_buf[data_pos[1]] = 0x2222;
tmp_buf[data_pos[2]] = 0x3333;
/* generate proc_mem path */
sprintf(pfname, "/proc/%d/mem", pid);
/* open proc_mem */
fd = open(pfname, O_RDWR);
CHKANDJUMP(fd < 0, "open proc_mem");
fd = open(pfname, O_WRONLY);
OKNG(fd != -1, "open /proc/<PID>/mem is failed");
/* pwrite 2MB */
errno = 0;
ret = pwrite(fd, tmp_buf, 2 * MEGA, (off_t)anon_map);
OKNG(ret != 2 * MEGA || errno != 0, "2MB pwrite");
/* pwrite 4MB */
errno = 0;
ret = pwrite(fd, tmp_buf, 4 * MEGA, (off_t)anon_map);
OKNG(ret != 4 * MEGA || errno != 0, "4MB pwrite");
/* pwrite 8MB */
errno = 0;
ret = pwrite(fd, tmp_buf, 8 * MEGA, (off_t)anon_map);
OKNG(ret != 8 * MEGA || errno != 0, "8MB pwrite");
close(fd);
OKNG(errno != EACCES, "errno is EACCES");
printf("*** %s PASSED\n\n", TEST_NAME);