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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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16
executer/user/mcexec.c
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@@ -4120,19 +4120,22 @@ gettid_out:
}
fork_child_sync_pipe:
sem_post(&fs->sem);
sem_destroy(&fs->sem);
if (fs->status)
exit(1);
/* clear fork_sync inherited from parent */
for (fp = fork_sync_top; fp;) {
fb = fp->next;
if (fp->fs && fp->fs != fs)
if (fp->fs && fp->fs != fs) {
munmap(fp->fs, sizeof(struct fork_sync));
}
free(fp);
fp = fb;
}
fork_sync_top = NULL;
sem_post(&fs->sem);
if (fs->status) {
exit(1);
}
pthread_mutex_init(&fork_sync_mutex, NULL);
/* TODO: does the forked thread run in a pthread context? */
@@ -4145,6 +4148,7 @@ fork_child_sync_pipe:
exit(1);
}
sem_destroy(&fs->sem);
munmap(fs, sizeof(struct fork_sync));
#if 1 /* debug : thread killed by exit_group() are still joinable? */
join_all_threads();