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Tofu: fault stack area if VM range doesn't exist in STAG registration

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Change-Id: I407a8954ccaf22019b3082fd6eee68e772d1cb26
This commit is contained in:
Balazs Gerofi
2021-02-14 20:43:43 +09:00
committed by Masamichi Takagi
parent c7145c4b38
commit aca83bcd3d
1 changed files with 16 additions and 0 deletions
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16
kernel/tofu/tof_utofu_main.c
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@ -1236,6 +1236,7 @@ static int tof_utofu_ioctl_alloc_stag(struct tof_utofu_device *dev, unsigned lon
readonly = (req.flags & 1) != 0;
retry:
ihk_rwspinlock_read_lock_noirq(&vm->memory_range_lock);
/* Assume smallest page size at first */
@ -1271,6 +1272,20 @@ static int tof_utofu_ioctl_alloc_stag(struct tof_utofu_device *dev, unsigned lon
}
if (!range) {
if (vm->region.stack_start <= start &&
vm->region.stack_end > end) {
ihk_rwspinlock_read_unlock_noirq(&vm->memory_range_lock);
if (page_fault_process_vm(vm, (void *)start,
PF_POPULATE | PF_WRITE | PF_USER) < 0) {
ret = -EINVAL;
goto out;
}
goto retry;
}
ret = -EINVAL;
goto unlock_out;
}
@ -1358,6 +1373,7 @@ static int tof_utofu_ioctl_alloc_stag(struct tof_utofu_device *dev, unsigned lon
unlock_out:
ihk_rwspinlock_read_unlock_noirq(&vm->memory_range_lock);
out:
if(ret == 0){
if(copy_to_user((void *)arg, &req, sizeof(req)) != 0){
kprintf("%s: ret: %d\n", __func__, -EFAULT);