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LibELF: Use StringBuilders instead of Strings for the interpreter path

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This is required for the Kernel's usage of LibELF, since Strings do not
expose allocation failure.
This commit is contained in:
Idan Horowitz 2022-01-13 18:50:17 +02:00 • committed by Andreas Kling
parent fb3e46e930
commit 3e959618c3
8 changed files with 36 additions and 18 deletions
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10
Kernel/Syscalls/execve.cpp
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@ -713,11 +713,12 @@ static ErrorOr<NonnullOwnPtrVector<KString>> find_shebang_interpreter_for_execut
ErrorOr<RefPtr<OpenFileDescription>> Process::find_elf_interpreter_for_executable(StringView path, ElfW(Ehdr) const& main_executable_header, size_t main_executable_header_size, size_t file_size)
{
// Not using ErrorOr here because we'll want to do the same thing in userspace in the RTLD
String interpreter_path;
if (!ELF::validate_program_headers(main_executable_header, file_size, (u8 const*)&main_executable_header, main_executable_header_size, &interpreter_path)) {
StringBuilder interpreter_path_builder;
if (!TRY(ELF::validate_program_headers(main_executable_header, file_size, (u8 const*)&main_executable_header, main_executable_header_size, &interpreter_path_builder))) {
dbgln("exec({}): File has invalid ELF Program headers", path);
return ENOEXEC;
}
auto interpreter_path = interpreter_path_builder.string_view();
if (!interpreter_path.is_empty()) {
dbgln_if(EXEC_DEBUG, "exec({}): Using program interpreter {}", path, interpreter_path);
@ -745,11 +746,12 @@ ErrorOr<RefPtr<OpenFileDescription>> Process::find_elf_interpreter_for_executabl
}
// Not using ErrorOr 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)) {
StringBuilder interpreter_interpreter_path_builder;
if (!TRY(ELF::validate_program_headers(*elf_header, interp_metadata.size, (u8*)first_page, nread, &interpreter_interpreter_path_builder))) {
dbgln("exec({}): Interpreter ({}) has invalid ELF Program headers", path, interpreter_path);
return ENOEXEC;
}
auto interpreter_interpreter_path = interpreter_interpreter_path_builder.string_view();
if (!interpreter_interpreter_path.is_empty()) {
dbgln("exec({}): Interpreter ({}) has its own interpreter ({})! No thank you!", path, interpreter_path, interpreter_interpreter_path);