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author | Liav A <liavalb@gmail.com> | 2022-12-15 21:08:57 +0200 |
---|---|---|
committer | Andrew Kaster <andrewdkaster@gmail.com> | 2022-12-16 01:02:00 -0700 |
commit | 8585b2dc23ec206777a4cfbd558766d90fc577e7 (patch) | |
tree | 36a87ee00a179aad52f4d1f0a9646b1c65206c22 /Kernel/Memory/AddressSpace.cpp | |
parent | 6c0486277e9bc8238ae82ee857a70014c9397db9 (diff) | |
download | serenity-8585b2dc23ec206777a4cfbd558766d90fc577e7.zip |
Kernel/Memory: Add option to annotate region mapping as immutable
We add this basic functionality to the Kernel so Userspace can request a
particular virtual memory mapping to be immutable. This will be useful
later on in the DynamicLoader code.
The annotation of a particular Kernel Region as immutable implies that
the following restrictions apply, so these features are prohibited:
- Changing the region's protection bits
- Unmapping the region
- Annotating the region with other virtual memory flags
- Applying further memory advises on the region
- Changing the region name
- Re-mapping the region
Diffstat (limited to 'Kernel/Memory/AddressSpace.cpp')
-rw-r--r-- | Kernel/Memory/AddressSpace.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Kernel/Memory/AddressSpace.cpp b/Kernel/Memory/AddressSpace.cpp index e37d3f22c3..1fa839afdb 100644 --- a/Kernel/Memory/AddressSpace.cpp +++ b/Kernel/Memory/AddressSpace.cpp @@ -59,6 +59,8 @@ ErrorOr<void> AddressSpace::unmap_mmap_range(VirtualAddress addr, size_t size) if (auto* whole_region = find_region_from_range(range_to_unmap)) { if (!whole_region->is_mmap()) return EPERM; + if (whole_region->is_immutable()) + return EPERM; PerformanceManager::add_unmap_perf_event(Process::current(), whole_region->range()); @@ -69,6 +71,8 @@ ErrorOr<void> AddressSpace::unmap_mmap_range(VirtualAddress addr, size_t size) if (auto* old_region = find_region_containing(range_to_unmap)) { if (!old_region->is_mmap()) return EPERM; + if (old_region->is_immutable()) + return EPERM; // Remove the old region from our regions tree, since were going to add another region // with the exact same start address. @@ -99,6 +103,8 @@ ErrorOr<void> AddressSpace::unmap_mmap_range(VirtualAddress addr, size_t size) for (auto* region : regions) { if (!region->is_mmap()) return EPERM; + if (region->is_immutable()) + return EPERM; } Vector<Region*, 2> new_regions; |