Andreas Kling 0fc24fe256 Kernel: User pointer validation should reject kernel-only addresses ...

We were happily allowing syscalls with pointers into kernel-only
regions (virtual address >= 0xc0000000).

This patch fixes that by only considering user regions in the current
process, and also double-checking the Region::is_user_accessible() flag
before approving an access.

Thanks to Fire30 for finding the bug! :^)

2019-12-31 00:24:35 +01:00

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