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Kernel+LibELF: Add support for validating and loading ELF64 executables

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This commit is contained in:
Gunnar Beutner 2021-06-28 17:24:08 +02:00 • committed by Andreas Kling
parent e35b060501
commit 158355e0d7
13 changed files with 109 additions and 78 deletions
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20
Kernel/Syscalls/execve.cpp
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@ -187,7 +187,7 @@ static KResultOr<RequiredLoadRange> get_required_load_range(FileDescription& pro
return range;
};
static KResultOr<FlatPtr> get_load_offset(const Elf32_Ehdr& main_program_header, FileDescription& main_program_description, FileDescription* interpreter_description)
static KResultOr<FlatPtr> get_load_offset(const ElfW(Ehdr) & main_program_header, FileDescription& main_program_description, FileDescription* interpreter_description)
{
constexpr FlatPtr load_range_start = 0x08000000;
constexpr FlatPtr load_range_size = 65536 * PAGE_SIZE; // 2**16 * PAGE_SIZE = 256MB
@ -431,7 +431,8 @@ static KResultOr<LoadResult> load_elf_object(NonnullOwnPtr<Space> new_space, Fil
};
}
KResultOr<LoadResult> Process::load(NonnullRefPtr<FileDescription> main_program_description, RefPtr<FileDescription> interpreter_description, const Elf32_Ehdr& main_program_header)
KResultOr<LoadResult> Process::load(NonnullRefPtr<FileDescription> main_program_description,
RefPtr<FileDescription> interpreter_description, const ElfW(Ehdr) & main_program_header)
{
auto new_space = Space::create(*this, nullptr);
if (!new_space)
@ -471,7 +472,8 @@ KResultOr<LoadResult> Process::load(NonnullRefPtr<FileDescription> main_program_
return interpreter_load_result;
}
KResult Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Vector<String> arguments, Vector<String> environment, RefPtr<FileDescription> interpreter_description, Thread*& new_main_thread, u32& prev_flags, const Elf32_Ehdr& main_program_header)
KResult Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Vector<String> arguments, Vector<String> environment,
RefPtr<FileDescription> interpreter_description, Thread*& new_main_thread, u32& prev_flags, const ElfW(Ehdr) & main_program_header)
{
VERIFY(is_user_process());
VERIFY(!Processor::current().in_critical());
@ -740,7 +742,7 @@ static KResultOr<Vector<String>> find_shebang_interpreter_for_executable(const c
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)
KResultOr<RefPtr<FileDescription>> Process::find_elf_interpreter_for_executable(const String& path, const ElfW(Ehdr) & main_program_header, int nread, size_t file_size)
{
// Not using KResultOr here because we'll want to do the same thing in userspace in the RTLD
String interpreter_path;
@ -763,7 +765,7 @@ 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))
if (interp_metadata.size < (int)sizeof(ElfW(Ehdr)))
return ENOEXEC;
char first_page[PAGE_SIZE] = {};
@ -773,10 +775,10 @@ KResultOr<RefPtr<FileDescription>> Process::find_elf_interpreter_for_executable(
return ENOEXEC;
nread = nread_or_error.value();
if (nread < (int)sizeof(Elf32_Ehdr))
if (nread < (int)sizeof(ElfW(Ehdr)))
return ENOEXEC;
auto elf_header = (Elf32_Ehdr*)first_page;
auto elf_header = (ElfW(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 ENOEXEC;
@ -862,9 +864,9 @@ KResult Process::exec(String path, Vector<String> arguments, Vector<String> envi
// #2) ELF32 for i386
if (nread_or_error.value() < (int)sizeof(Elf32_Ehdr))
if (nread_or_error.value() < (int)sizeof(ElfW(Ehdr)))
return ENOEXEC;
auto main_program_header = (Elf32_Ehdr*)first_page;
auto main_program_header = (ElfW(Ehdr)*)first_page;
if (!ELF::validate_elf_header(*main_program_header, metadata.size)) {
dbgln("exec({}): File has invalid ELF header", path);