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Kernel+LibC: Add minherit() and MAP_INHERIT_ZERO

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This patch adds the minherit() syscall originally invented by OpenBSD.
Only the MAP_INHERIT_ZERO mode is supported for now. If set on an mmap
region, that region will be zeroed out on fork().
This commit is contained in:
Andreas Kling 2020-04-12 20:22:26 +02:00
parent dd00175ae2
commit c19b56dc99
8 changed files with 58 additions and 1 deletions
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10
Kernel/VM/Region.cpp
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@ -68,6 +68,16 @@ NonnullOwnPtr<Region> Region::clone()
{
ASSERT(Process::current);
if (m_inherit_mode == InheritMode::ZeroedOnFork) {
ASSERT(m_mmap);
ASSERT(!m_shared);
ASSERT(vmobject().is_anonymous());
auto zeroed_region = Region::create_user_accessible(m_range, AnonymousVMObject::create_with_size(size()), 0, m_name, m_access);
zeroed_region->set_mmap(m_mmap);
zeroed_region->set_inherit_mode(m_inherit_mode);
return zeroed_region;
}
if (m_shared) {
ASSERT(!m_stack);
#ifdef MM_DEBUG