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fix: fork's race-condition caused by child and grand-child

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Refs: #1329
Change-Id: Ia2d7641d1203f40155fef5db718d1bb2c583c1c5
This commit is contained in:
Ken Sato
2019-12-20 11:24:14 +09:00
committed by Masamichi Takagi
parent 5b26fe2956
commit 911b07f507
16 changed files with 2236 additions and 361 deletions
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67
test/issues/1324/C1324T02.c Normal file
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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/mman.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#define GB (1024 * 1024 * 1024)
#define MAP_SIZE (1 * GB)
int main(int argc, char **argv)
{
int rc, ret;
void *addr1, *addr2;
stack_t *ss, *oss;
ssize_t stack_t_size = sizeof(stack_t);
addr1 = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (addr1 == MAP_FAILED) {
ret = -1;
perror("failed to mmap 1st: ");
goto out;
}
addr2 = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (addr2 == MAP_FAILED) {
ret = -1;
perror("failed to mmap 2nd: ");
goto out;
}
oss = addr1 + MAP_SIZE - stack_t_size;
memset(oss, '0', stack_t_size);
ss = addr2 + MAP_SIZE - stack_t_size;
memset(ss, '0', stack_t_size);
rc = sigaltstack(NULL, oss);
if (rc == 0) {
printf("[OK] sigaltstack 1st is successful\n");
}
else {
ret = -1;
perror("[NG] failed to sigaltstack 1st: ");
goto out;
}
ss->ss_sp = oss->ss_sp;
ss->ss_flags = oss->ss_flags;
ss->ss_size = oss->ss_size;
rc = sigaltstack(ss, NULL);
if (rc == 0) {
printf("[OK] sigaltstack 2nd is successful\n");
}
else {
ret = -1;
perror("[NG] failed to sigaltstack 2nd: ");
goto out;
}
out:
return ret;
}