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Kernel: Create and use USER_RANGE_CEILING

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We had an inconsistency in valid user addresses. is_user_range() was
checking against the kernel base address, but previous changes caused
the maximum valid user addressable range to be 32 MiB below that.

This patch stops mmap(MAP_FIXED) of a range between these two bounds
from panic-ing the kernel in RangeAllocator::allocate_specific.
This commit is contained in:
Andrew Kaster 2021-07-06 20:25:22 -06:00 • committed by Andreas Kling
parent ab196b484a
commit 578d45b480
3 changed files with 4 additions and 2 deletions
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2
Kernel/Sections.h
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@ -19,3 +19,5 @@
#define KERNEL_QUICKMAP_PD (KERNEL_PT1024_BASE + 0x7000)
#define KERNEL_QUICKMAP_PER_CPU_BASE (KERNEL_PT1024_BASE + 0x8000)
#define KERNEL_PHYSICAL_PAGES_BASE (KERNEL_BASE + KERNEL_PD_OFFSET)
#define USER_RANGE_CEILING 0xBE000000