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sched/sem_holder.c: When accessing SEM_WAITLIST, use holder's addrenv #11191

Merged
merged 1 commit into from Nov 15, 2023
Merged

sched/sem_holder.c: When accessing SEM_WAITLIST, use holder's addrenv #11191

merged 1 commit into from Nov 15, 2023

Commits on Nov 15, 2023

  1. sched/sem_holder.c: When accessing SEM_WAITLIST, use holder's addrenv 

    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);
    @pussuw
    pussuw committed Nov 15, 2023
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