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Kernel: Make kernel memory regions be non-executable by default

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From now on, you'll have to request executable memory specifically
if you want some.
This commit is contained in:
Andreas Kling
2019-12-25 22:41:34 +01:00
parent 0b7a2e0a5a
commit 9e55bcb7da
7 changed files with 27 additions and 31 deletions
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10
Kernel/Process.cpp
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@@ -1019,7 +1019,7 @@ void create_signal_trampolines()
InterruptDisabler disabler;
// NOTE: We leak this region.
auto* trampoline_region = MM.allocate_user_accessible_kernel_region(PAGE_SIZE, "Signal trampolines").leak_ptr();
auto* trampoline_region = MM.allocate_user_accessible_kernel_region(PAGE_SIZE, "Signal trampolines", Region::Access::Read | Region::Access::Write | Region::Access::Execute).leak_ptr();
g_return_to_ring3_from_signal_trampoline = trampoline_region->vaddr();
u8* trampoline = (u8*)asm_signal_trampoline;
@@ -1035,15 +1035,11 @@ void create_signal_trampolines()
void create_kernel_info_page()
{
auto* info_page_region_for_userspace = MM.allocate_user_accessible_kernel_region(PAGE_SIZE, "Kernel info page").leak_ptr();
auto* info_page_region_for_kernel = MM.allocate_kernel_region_with_vmobject(info_page_region_for_userspace->vmobject(), PAGE_SIZE, "Kernel info page").leak_ptr();
auto* info_page_region_for_userspace = MM.allocate_user_accessible_kernel_region(PAGE_SIZE, "Kernel info page", Region::Access::Read).leak_ptr();
auto* info_page_region_for_kernel = MM.allocate_kernel_region_with_vmobject(info_page_region_for_userspace->vmobject(), PAGE_SIZE, "Kernel info page", Region::Access::Read | Region::Access::Write).leak_ptr();
s_info_page_address_for_userspace = info_page_region_for_userspace->vaddr();
s_info_page_address_for_kernel = info_page_region_for_kernel->vaddr();
memset(s_info_page_address_for_kernel.as_ptr(), 0, PAGE_SIZE);
info_page_region_for_userspace->set_writable(false);
info_page_region_for_userspace->remap();
}
int Process::sys$restore_signal_mask(u32 mask)