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Kernel: Assert that a KmallocSubheap fits inside a page

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Since we allocate the subheap in the first page of the given storage
let's assert that the subheap can actually fit in a single page, to
prevent the possible future headache of trying to debug the cause of
random kernel memory corruption :^)
This commit is contained in:
Idan Horowitz 2021-12-26 00:52:33 +02:00 committed by Andreas Kling
parent 1c99f99e99
commit 7757d874ad
Notes: sideshowbarker 2024-07-17 22:10:44 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/7757d874adc
Pull-request: https://github.com/SerenityOS/serenity/pull/11427
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/awesomekling ✅
1 changed files with 1 additions and 0 deletions
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Kernel/Heap/kmalloc.cpp
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@ -58,6 +58,7 @@ struct KmallocGlobalData {
void add_subheap(u8* storage, size_t storage_size)
{
dbgln("Adding kmalloc subheap @ {} with size {}", storage, storage_size);
static_assert(sizeof(KmallocSubheap) <= PAGE_SIZE);
auto* subheap = new (storage) KmallocSubheap(storage + PAGE_SIZE, storage_size - PAGE_SIZE);
subheaps.append(*subheap);
}