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Kernel: Fix GDT limits

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The GDT limits are inclusive, so for correctness we should subtract
one from the structs' size.
This commit is contained in:
Gunnar Beutner 2021-06-25 22:36:17 +02:00 • committed by Andreas Kling
parent ee4fc97038
commit 29d9666e02
1 changed files with 2 additions and 2 deletions
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4
Kernel/Arch/x86/common/Processor.cpp
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@ -1074,7 +1074,7 @@ UNMAP_AFTER_INIT void Processor::gdt_init()
Descriptor fs_descriptor {}; Descriptor fs_descriptor {};
fs_descriptor.set_base(VirtualAddress { this }); fs_descriptor.set_base(VirtualAddress { this });
fs_descriptor.set_limit(sizeof(Processor)); fs_descriptor.set_limit(sizeof(Processor) - 1);
fs_descriptor.dpl = 0; fs_descriptor.dpl = 0;
fs_descriptor.segment_present = 1; fs_descriptor.segment_present = 1;
fs_descriptor.granularity = 0; fs_descriptor.granularity = 0;
@ -1086,7 +1086,7 @@ UNMAP_AFTER_INIT void Processor::gdt_init()
Descriptor tss_descriptor {}; Descriptor tss_descriptor {};
tss_descriptor.set_base(VirtualAddress { &m_tss }); tss_descriptor.set_base(VirtualAddress { &m_tss });
tss_descriptor.set_limit(sizeof(TSS32)); tss_descriptor.set_limit(sizeof(TSS32) - 1);
tss_descriptor.dpl = 0; tss_descriptor.dpl = 0;
tss_descriptor.segment_present = 1; tss_descriptor.segment_present = 1;
tss_descriptor.granularity = 0; tss_descriptor.granularity = 0;