RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-28 04:27:45 +00:00
Code Issues Activity Actions

LibELF: Use StringBuilders instead of Strings for the interpreter path

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

5
Userland/Libraries/LibELF/DynamicLoader.cpp
View file

@ -122,8 +122,11 @@ bool DynamicLoader::validate()
auto* elf_header = (ElfW(Ehdr)*)m_file_data;
if (!validate_elf_header(*elf_header, m_file_size))
return false;
if (!validate_program_headers(*elf_header, m_file_size, (u8*)m_file_data, m_file_size, &m_program_interpreter))
StringBuilder interpreter_path_builder;
auto result_or_error = validate_program_headers(*elf_header, m_file_size, (u8*)m_file_data, m_file_size, &interpreter_path_builder);
if (result_or_error.is_error() || !result_or_error.value())
return false;
m_program_interpreter = interpreter_path_builder.string_view();
return true;
}

9
Userland/Libraries/LibELF/Image.cpp
View file

@ -126,7 +126,14 @@ bool Image::parse()
return false;
}
if (!validate_program_headers(header(), m_size, m_buffer, m_size, nullptr, m_verbose_logging)) {
auto result_or_error = validate_program_headers(header(), m_size, m_buffer, m_size, nullptr, m_verbose_logging);
if (result_or_error.is_error()) {
if (m_verbose_logging)
dbgln("ELF::Image::parse(): Failed validating ELF Program Headers");
m_valid = false;
return false;
}
if (!result_or_error.value()) {
if (m_verbose_logging)
dbgln("ELF::Image::parse(): ELF Program Headers not valid");
m_valid = false;

6
Userland/Libraries/LibELF/Validation.cpp
View file

@ -192,7 +192,7 @@ bool validate_elf_header(const ElfW(Ehdr) & elf_header, size_t file_size, bool v
return true;
}
bool validate_program_headers(const ElfW(Ehdr) & elf_header, size_t file_size, const u8* buffer, size_t buffer_size, String* interpreter_path, bool verbose)
ErrorOr<bool> validate_program_headers(const ElfW(Ehdr) & elf_header, size_t file_size, const u8* buffer, size_t buffer_size, StringBuilder* interpreter_path_builder, bool verbose)
{
Checked<size_t> total_size_of_program_headers = elf_header.e_phnum;
total_size_of_program_headers *= elf_header.e_phentsize;
@ -268,8 +268,8 @@ bool validate_program_headers(const ElfW(Ehdr) & elf_header, size_t file_size, c
dbgln("Found PT_INTERP header ({}), but p_filesz is invalid ({})", header_index, program_header.p_filesz);
return false;
}
if (interpreter_path)
*interpreter_path = String((const char*)&buffer[program_header.p_offset], program_header.p_filesz - 1);
if (interpreter_path_builder)
TRY(interpreter_path_builder->try_append({ &buffer[program_header.p_offset], program_header.p_filesz - 1 }));
break;
case PT_LOAD:
case PT_DYNAMIC:

3
Userland/Libraries/LibELF/Validation.h
View file

@ -8,10 +8,11 @@
#include <AK/String.h>
#include <LibC/elf.h>
#include <limits.h>
namespace ELF {
bool validate_elf_header(const ElfW(Ehdr) & elf_header, size_t file_size, bool verbose = true);
bool validate_program_headers(const ElfW(Ehdr) & elf_header, size_t file_size, const u8* buffer, size_t buffer_size, String* interpreter_path, bool verbose = true);
ErrorOr<bool> validate_program_headers(const ElfW(Ehdr) & elf_header, size_t file_size, const u8* buffer, size_t buffer_size, StringBuilder* interpreter_path_builder, bool verbose = true);
} // end namespace ELF