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Kernel: Map executables at a kernel address during ELF load

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This is both simpler and more robust than mapping them in the process
address space.
This commit is contained in:
Andreas Kling 2020-03-02 10:42:53 +01:00
parent 678c87087d
commit e56f8706ce
1 changed files with 4 additions and 8 deletions
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12
Kernel/Process.cpp
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@ -832,9 +832,6 @@ int Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Ve
dbg() << "Process " << pid() << " exec: PD=" << m_page_directory.ptr() << " created"; dbg() << "Process " << pid() << " exec: PD=" << m_page_directory.ptr() << " created";
#endif #endif
MM.enter_process_paging_scope(*this);
Region* region { nullptr };
InodeMetadata loader_metadata; InodeMetadata loader_metadata;
@ -848,23 +845,22 @@ int Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Ve
// FIXME: We should be able to load both the PT_INTERP interpreter and the main program... once the RTLD is smart enough // FIXME: We should be able to load both the PT_INTERP interpreter and the main program... once the RTLD is smart enough
if (interpreter_description) { if (interpreter_description) {
loader_metadata = interpreter_description->metadata(); loader_metadata = interpreter_description->metadata();
region = allocate_region_with_vmobject(VirtualAddress(), loader_metadata.size, *vmobject, 0, interpreter_description->absolute_path(), PROT_READ, false);
// we don't need the interpreter file desciption after we've loaded (or not) it into memory // we don't need the interpreter file desciption after we've loaded (or not) it into memory
interpreter_description = nullptr; interpreter_description = nullptr;
} else { } else {
loader_metadata = main_program_description->metadata(); loader_metadata = main_program_description->metadata();
region = allocate_region_with_vmobject(VirtualAddress(), loader_metadata.size, *vmobject, 0, main_program_description->absolute_path(), PROT_READ, false);
} }
ASSERT(region); auto region = MM.allocate_kernel_region_with_vmobject(*vmobject, PAGE_ROUND_UP(loader_metadata.size), "ELF loading", Region::Access::Read);
if (!region)
region->set_shared(true); return -ENOMEM;
Region* master_tls_region { nullptr }; Region* master_tls_region { nullptr };
size_t master_tls_size = 0; size_t master_tls_size = 0;
size_t master_tls_alignment = 0; size_t master_tls_alignment = 0;
u32 entry_eip = 0; u32 entry_eip = 0;
MM.enter_process_paging_scope(*this);
OwnPtr<ELFLoader> loader; OwnPtr<ELFLoader> loader;
{ {
ArmedScopeGuard rollback_regions_guard([&]() { ArmedScopeGuard rollback_regions_guard([&]() {