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Kernel+LibC: Turn errno codes into a strongly typed enum

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..and allow implicit creation of KResult and KResultOr from ErrnoCode.
This means that kernel functions that return those types can finally
do "return EINVAL;" and it will just work.

There's a handful of functions that still deal with signed integers
that should be converted to return KResults.
This commit is contained in:
Andreas Kling 2021-01-20 23:11:17 +01:00
parent e279b45aed
commit 19d3f8cab7
48 changed files with 591 additions and 506 deletions
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44
Kernel/Syscalls/execve.cpp
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@ -149,7 +149,7 @@ KResultOr<Process::LoadResult> Process::load_elf_object(FileDescription& object_
auto vmobject = SharedInodeVMObject::create_with_inode(inode);
if (vmobject->writable_mappings()) {
dbgln("Refusing to execute a write-mapped program");
return KResult(-ETXTBSY);
return ETXTBSY;
}
size_t executable_size = inode.size();
@ -157,13 +157,13 @@ KResultOr<Process::LoadResult> Process::load_elf_object(FileDescription& object_
auto executable_region = MM.allocate_kernel_region_with_vmobject(*vmobject, PAGE_ROUND_UP(executable_size), "ELF loading", Region::Access::Read);
if (!executable_region) {
dbgln("Could not allocate memory for ELF loading");
return KResult(-ENOMEM);
return ENOMEM;
}
auto elf_image = ELF::Image(executable_region->vaddr().as_ptr(), executable_size);
if (!elf_image.is_valid())
return KResult(-ENOEXEC);
return ENOEXEC;
Region* master_tls_region { nullptr };
size_t master_tls_size = 0;
@ -181,7 +181,7 @@ KResultOr<Process::LoadResult> Process::load_elf_object(FileDescription& object_
if (!elf_image.is_within_image(program_header.raw_data(), program_header.size_in_image())) {
dbgln("Shenanigans! ELF PT_TLS header sneaks outside of executable.");
ph_load_result = KResult(-ENOEXEC);
ph_load_result = ENOEXEC;
return IterationDecision::Break;
}
@ -195,7 +195,7 @@ KResultOr<Process::LoadResult> Process::load_elf_object(FileDescription& object_
master_tls_alignment = program_header.alignment();
if (!copy_to_user(master_tls_region->vaddr().as_ptr(), program_header.raw_data(), program_header.size_in_image())) {
ph_load_result = KResult(-EFAULT);
ph_load_result = EFAULT;
return IterationDecision::Break;
}
return IterationDecision::Continue;
@ -210,7 +210,7 @@ KResultOr<Process::LoadResult> Process::load_elf_object(FileDescription& object_
if (!elf_image.is_within_image(program_header.raw_data(), program_header.size_in_image())) {
dbgln("Shenanigans! Writable ELF PT_LOAD header sneaks outside of executable.");
ph_load_result = KResult(-ENOEXEC);
ph_load_result = ENOEXEC;
return IterationDecision::Break;
}
@ -236,7 +236,7 @@ KResultOr<Process::LoadResult> Process::load_elf_object(FileDescription& object_
auto page_offset = program_header.vaddr();
page_offset.mask(~PAGE_MASK);
if (!copy_to_user((u8*)region_or_error.value()->vaddr().as_ptr() + page_offset.get(), program_header.raw_data(), program_header.size_in_image())) {
ph_load_result = KResult(-EFAULT);
ph_load_result = EFAULT;
return IterationDecision::Break;
}
return IterationDecision::Continue;
@ -269,7 +269,7 @@ KResultOr<Process::LoadResult> Process::load_elf_object(FileDescription& object_
if (!elf_image.entry().offset(load_offset).get()) {
dbgln("do_exec: Failure loading program, entry pointer is invalid! {})", elf_image.entry().offset(load_offset));
return KResult(-ENOEXEC);
return ENOEXEC;
}
auto stack_region_or_error = allocate_region(VirtualAddress(), Thread::default_userspace_stack_size, "Stack (Main thread)", PROT_READ | PROT_WRITE, AllocationStrategy::Reserve);
@ -299,7 +299,7 @@ KResultOr<Process::LoadResult> Process::load(NonnullRefPtr<FileDescription> main
{
auto page_directory = PageDirectory::create_for_userspace(*this);
if (!page_directory)
return KResult(-ENOMEM);
return ENOMEM;
// Need to make sure we don't swap contexts in the middle
ScopedCritical critical;
@ -366,12 +366,12 @@ static KResultOr<RequiredLoadRange> get_required_load_range(FileDescription& pro
auto region = MM.allocate_kernel_region_with_vmobject(*vmobject, PAGE_ROUND_UP(executable_size), "ELF memory range calculation", Region::Access::Read);
if (!region) {
dbgln("Could not allocate memory for ELF");
return KResult(-ENOMEM);
return ENOMEM;
}
auto elf_image = ELF::Image(region->vaddr().as_ptr(), executable_size);
if (!elf_image.is_valid()) {
return -EINVAL;
return EINVAL;
}
RequiredLoadRange range {};
@ -688,7 +688,7 @@ static KResultOr<Vector<String>> find_shebang_interpreter_for_executable(const c
return interpreter_words;
}
return KResult(-ENOEXEC);
return ENOEXEC;
}
KResultOr<RefPtr<FileDescription>> Process::find_elf_interpreter_for_executable(const String& path, const Elf32_Ehdr& main_program_header, int nread, size_t file_size)
@ -698,7 +698,7 @@ KResultOr<RefPtr<FileDescription>> Process::find_elf_interpreter_for_executable(
String interpreter_path;
if (!ELF::validate_program_headers(main_program_header, file_size, (const u8*)&main_program_header, nread, &interpreter_path)) {
dbgln("exec({}): File has invalid ELF Program headers", path);
return KResult(-ENOEXEC);
return ENOEXEC;
}
if (!interpreter_path.is_empty()) {
@ -719,34 +719,34 @@ KResultOr<RefPtr<FileDescription>> Process::find_elf_interpreter_for_executable(
// Validate the program interpreter as a valid elf binary.
// If your program interpreter is a #! file or something, it's time to stop playing games :)
if (interp_metadata.size < (int)sizeof(Elf32_Ehdr))
return KResult(-ENOEXEC);
return ENOEXEC;
char first_page[PAGE_SIZE] = {};
auto first_page_buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)&first_page);
auto nread_or_error = interpreter_description->read(first_page_buffer, sizeof(first_page));
if (nread_or_error.is_error())
return KResult(-ENOEXEC);
return ENOEXEC;
nread = nread_or_error.value();
if (nread < (int)sizeof(Elf32_Ehdr))
return KResult(-ENOEXEC);
return ENOEXEC;
auto elf_header = (Elf32_Ehdr*)first_page;
if (!ELF::validate_elf_header(*elf_header, interp_metadata.size)) {
dbgln("exec({}): Interpreter ({}) has invalid ELF header", path, interpreter_description->absolute_path());
return KResult(-ENOEXEC);
return ENOEXEC;
}
// Not using KResultOr here because we'll want to do the same thing in userspace in the RTLD
String interpreter_interpreter_path;
if (!ELF::validate_program_headers(*elf_header, interp_metadata.size, (u8*)first_page, nread, &interpreter_interpreter_path)) {
dbgln("exec({}): Interpreter ({}) has invalid ELF Program headers", path, interpreter_description->absolute_path());
return KResult(-ENOEXEC);
return ENOEXEC;
}
if (!interpreter_interpreter_path.is_empty()) {
dbgln("exec({}): Interpreter ({}) has its own interpreter ({})! No thank you!", path, interpreter_description->absolute_path(), interpreter_interpreter_path);
return KResult(-ELOOP);
return ELOOP;
}
return interpreter_description;
@ -754,7 +754,7 @@ KResultOr<RefPtr<FileDescription>> Process::find_elf_interpreter_for_executable(
if (main_program_header.e_type == ET_REL) {
// We can't exec an ET_REL, that's just an object file from the compiler
return KResult(-ENOEXEC);
return ENOEXEC;
}
if (main_program_header.e_type == ET_DYN) {
// If it's ET_DYN with no PT_INTERP, then it's a dynamic executable responsible
@ -817,12 +817,12 @@ int Process::exec(String path, Vector<String> arguments, Vector<String> environm
// #2) ELF32 for i386
if (nread_or_error.value() < (int)sizeof(Elf32_Ehdr))
return KResult(-ENOEXEC);
return ENOEXEC;
auto main_program_header = (Elf32_Ehdr*)first_page;
if (!ELF::validate_elf_header(*main_program_header, metadata.size)) {
dbgln("exec({}): File has invalid ELF header", path);
return KResult(-ENOEXEC);
return ENOEXEC;
}
auto elf_result = find_elf_interpreter_for_executable(path, *main_program_header, nread_or_error.value(), metadata.size);