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b7b0a17682
If the semaphore is shared, the holder has put its own mmapped address
to pholder->sem. This means we must switch to the holder's address
environment when going through the held semaphores list.
A better option would be to get the kernel mapped address for the
semaphore's physical page, but that mechanism is not functional yet.
This fixes a full system crash when CONFIG_PRIORITY_INHERITANCE=y and
CONFIG_BUILD_KERNEL=y and user makes shared semaphore via:
int semfd = shm_open("sem", O_CREAT | O_RDWR, 0666);
sem_t *sem = mmap(0, sizeof(sem_t), PROT_READ | PROT_WRITE, MAP_SHARED, semfd, 0);
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|---|---|---|
| .. | ||
| CMakeLists.txt | ||
| Make.defs | ||
| sem_clockwait.c | ||
| sem_destroy.c | ||
| sem_holder.c | ||
| sem_initialize.c | ||
| sem_post.c | ||
| sem_recover.c | ||
| sem_reset.c | ||
| sem_setprotocol.c | ||
| sem_tickwait.c | ||
| sem_timedwait.c | ||
| sem_timeout.c | ||
| sem_trywait.c | ||
| sem_wait.c | ||
| sem_waitirq.c | ||
| semaphore.h | ||
| spinlock.c | ||