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c1ceec3404
waitpid() cannot be used in kernel mode unless SCHED_HAVE_PARENT is
selected -> add dependency if BUILD_KERNEL is selected.
Why? Because without SCHED_HAVE_PARENT waitpid() works in a non-standard
way, meaning it does not use SIGCHLD to wake the parent, as it should.
Also, returning the child status via stat_loc corrupts memory as stat_loc
points to the parent's address environment:
pid_t nxsched_waitpid(pid_t pid, int *stat_loc, int options)
{
...
group->tg_statloc = stat_loc;
...
}
And later when the status is returned, the child writes to tg_statloc,
which points to the parent's address environment -> random memory
corruption:
static inline void nxtask_exitwakeup(FAR struct tcb_s *tcb, int status)
{
...
if (group->tg_statloc != NULL)
{
*group->tg_statloc = status << 8;
}
...
}
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| .. | ||
| addrenv | ||
| clock | ||
| environ | ||
| group | ||
| init | ||
| instrument | ||
| irq | ||
| misc | ||
| module | ||
| mqueue | ||
| paging | ||
| pthread | ||
| sched | ||
| semaphore | ||
| signal | ||
| task | ||
| timer | ||
| tls | ||
| wdog | ||
| wqueue | ||
| CMakeLists.txt | ||
| Kconfig | ||
| Makefile | ||