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LibELF: Move validation methods to their own file
These validate_elf_* methods really had no business being static methods of ELF::Image. Now that the ELF namespace exists, it makes sense to just move them to be free functions in the namespace.
This commit is contained in:
Andrew Kaster
Andreas Kling
parent
21b5909dc6
commit
61acca223f
Notes:
sideshowbarker
2024-07-19 07:42:04 +09:00
Author: https://github.com/ADKaster Commit: https://github.com/SerenityOS/serenity/commit/61acca223fe Pull-request: https://github.com/SerenityOS/serenity/pull/1750
7 changed files with 234 additions and 163 deletions
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@ -11,6 +11,7 @@ OBJS = \
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../AK/StringView.o \
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../Libraries/LibELF/Image.o \
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../Libraries/LibELF/Loader.o \
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../Libraries/LibELF/Validation.o \
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../Libraries/LibBareMetal/Output/Console.o \
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../Libraries/LibBareMetal/Output/kprintf.o \
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../Libraries/LibBareMetal/StdLib.o \
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@ -78,6 +78,7 @@
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#include <LibC/limits.h>
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#include <LibC/signal_numbers.h>
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#include <LibELF/Loader.h>
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#include <LibELF/Validation.h>
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//#define PROCESS_DEBUG
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//#define DEBUG_POLL_SELECT
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@ -1084,14 +1085,14 @@ KResultOr<NonnullRefPtr<FileDescription>> Process::find_elf_interpreter_for_exec
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return KResult(-ENOEXEC);
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auto elf_header = (Elf32_Ehdr*)first_page;
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if (!ELF::Image::validate_elf_header(*elf_header, file_size)) {
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if (!ELF::validate_elf_header(*elf_header, file_size)) {
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dbg() << "exec(" << path << "): File has invalid ELF header";
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return KResult(-ENOEXEC);
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}
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// Not using KResultOr here because we'll want to do the same thing in userspace in the RTLD
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String interpreter_path;
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if (!ELF::Image::validate_program_headers(*elf_header, file_size, (u8*)first_page, nread, interpreter_path)) {
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if (!ELF::validate_program_headers(*elf_header, file_size, (u8*)first_page, nread, interpreter_path)) {
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dbg() << "exec(" << path << "): File has invalid ELF Program headers";
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return KResult(-ENOEXEC);
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}
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@ -1124,14 +1125,14 @@ KResultOr<NonnullRefPtr<FileDescription>> Process::find_elf_interpreter_for_exec
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return KResult(-ENOEXEC);
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elf_header = (Elf32_Ehdr*)first_page;
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if (!ELF::Image::validate_elf_header(*elf_header, interp_metadata.size)) {
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if (!ELF::validate_elf_header(*elf_header, interp_metadata.size)) {
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dbg() << "exec(" << path << "): Interpreter (" << interpreter_description->absolute_path() << ") has invalid ELF header";
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return KResult(-ENOEXEC);
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}
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// Not using KResultOr here because we'll want to do the same thing in userspace in the RTLD
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String interpreter_interpreter_path;
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if (!ELF::Image::validate_program_headers(*elf_header, interp_metadata.size, (u8*)first_page, nread, interpreter_interpreter_path)) {
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if (!ELF::validate_program_headers(*elf_header, interp_metadata.size, (u8*)first_page, nread, interpreter_interpreter_path)) {
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dbg() << "exec(" << path << "): Interpreter (" << interpreter_description->absolute_path() << ") has invalid ELF Program headers";
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return KResult(-ENOEXEC);
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}
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@ -64,7 +64,8 @@ ELF_OBJS = \
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../LibELF/DynamicObject.o \
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../LibELF/DynamicLoader.o \
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../LibELF/Loader.o \
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../LibELF/Image.o
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../LibELF/Image.o \
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../LibELF/Validation.o
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OBJS = $(AK_OBJS) $(LIBC_OBJS) $(ELF_OBJS)
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@ -28,6 +28,7 @@
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#include <AK/StringBuilder.h>
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#include <AK/StringView.h>
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#include <LibELF/Image.h>
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#include <LibELF/Validation.h>
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namespace ELF {
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@ -261,161 +262,6 @@ const Image::Section Image::lookup_section(const String& name) const
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return section(0);
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}
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bool Image::validate_elf_header(const Elf32_Ehdr& elf_header, size_t file_size)
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{
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if (!IS_ELF(elf_header)) {
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dbgputstr("File is not an ELF file.\n");
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return false;
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}
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if (ELFCLASS32 != elf_header.e_ident[EI_CLASS]) {
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dbgputstr("File is not a 32 bit ELF file.\n");
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return false;
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}
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if (ELFDATA2LSB != elf_header.e_ident[EI_DATA]) {
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dbgputstr("File is not a little endian ELF file.\n");
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return false;
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}
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if (EV_CURRENT != elf_header.e_ident[EI_VERSION]) {
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dbgprintf("File has unrecognized ELF version (%d), expected (%d)!\n", elf_header.e_ident[EI_VERSION], EV_CURRENT);
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return false;
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}
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if (ELFOSABI_SYSV != elf_header.e_ident[EI_OSABI]) {
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dbgprintf("File has unknown OS ABI (%d), expected SYSV(0)!\n", elf_header.e_ident[EI_OSABI]);
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return false;
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}
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if (0 != elf_header.e_ident[EI_ABIVERSION]) {
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dbgprintf("File has unknown SYSV ABI version (%d)!\n", elf_header.e_ident[EI_ABIVERSION]);
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return false;
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}
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if (EM_386 != elf_header.e_machine) {
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dbgprintf("File has unknown machine (%d), expected i386 (3)!\n", elf_header.e_machine);
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return false;
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}
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if (ET_EXEC != elf_header.e_type && ET_DYN != elf_header.e_type && ET_REL != elf_header.e_type) {
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dbgprintf("File has unloadable ELF type (%d), expected REL (1), EXEC (2) or DYN (3)!\n", elf_header.e_type);
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return false;
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}
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if (EV_CURRENT != elf_header.e_version) {
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dbgprintf("File has unrecognized ELF version (%d), expected (%d)!\n", elf_header.e_version, EV_CURRENT);
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return false;
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}
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if (sizeof(Elf32_Ehdr) != elf_header.e_ehsize) {
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dbgprintf("File has incorrect ELF header size..? (%d), expected (%d)!\n", elf_header.e_ehsize, sizeof(Elf32_Ehdr));
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return false;
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}
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if (elf_header.e_phoff > file_size || elf_header.e_shoff > file_size) {
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dbgprintf("SHENANIGANS! program header offset (%d) or section header offset (%d) are past the end of the file!\n",
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elf_header.e_phoff, elf_header.e_shoff);
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return false;
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}
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if (elf_header.e_phnum != 0 && elf_header.e_phoff != elf_header.e_ehsize) {
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dbgprintf("File does not have program headers directly after the ELF header? program header offset (%d), expected (%d).\n",
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elf_header.e_phoff, elf_header.e_ehsize);
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return false;
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}
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if (0 != elf_header.e_flags) {
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dbgprintf("File has incorrect ELF header flags...? (%d), expected (%d).\n", elf_header.e_flags, 0);
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return false;
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}
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if (0 != elf_header.e_phnum && sizeof(Elf32_Phdr) != elf_header.e_phentsize) {
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dbgprintf("File has incorrect program header size..? (%d), expected (%d).\n", elf_header.e_phentsize, sizeof(Elf32_Phdr));
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return false;
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}
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if (sizeof(Elf32_Shdr) != elf_header.e_shentsize) {
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dbgprintf("File has incorrect section header size..? (%d), expected (%d).\n", elf_header.e_shentsize, sizeof(Elf32_Shdr));
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return false;
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}
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size_t end_of_last_program_header = elf_header.e_phoff + (elf_header.e_phnum * elf_header.e_phentsize);
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if (end_of_last_program_header > file_size) {
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dbgprintf("SHENANIGANS! End of last program header (%d) is past the end of the file!\n", end_of_last_program_header);
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return false;
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}
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size_t end_of_last_section_header = elf_header.e_shoff + (elf_header.e_shnum * elf_header.e_shentsize);
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if (end_of_last_section_header > file_size) {
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dbgprintf("SHENANIGANS! End of last section header (%d) is past the end of the file!\n", end_of_last_section_header);
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return false;
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}
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if (elf_header.e_shstrndx >= elf_header.e_shnum) {
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dbgprintf("SHENANIGANS! Section header string table index (%d) is not a valid index given we have %d section headers!\n", elf_header.e_shstrndx, elf_header.e_shnum);
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return false;
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}
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return true;
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}
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bool Image::validate_program_headers(const Elf32_Ehdr& elf_header, size_t file_size, u8* buffer, size_t buffer_size, String& interpreter_path)
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{
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// Can we actually parse all the program headers in the given buffer?
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size_t end_of_last_program_header = elf_header.e_phoff + (elf_header.e_phnum * elf_header.e_phentsize);
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if (end_of_last_program_header > buffer_size) {
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dbgprintf("Unable to parse program headers from buffer, buffer too small! Buffer size: %zu, End of program headers %zu\n",
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buffer_size, end_of_last_program_header);
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return false;
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}
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if (file_size < buffer_size) {
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dbgputstr("We somehow read more from a file than was in the file in the first place!\n");
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ASSERT_NOT_REACHED();
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}
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size_t num_program_headers = elf_header.e_phnum;
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auto program_header_begin = (const Elf32_Phdr*)&(buffer[elf_header.e_phoff]);
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for (size_t header_index = 0; header_index < num_program_headers; ++header_index) {
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auto& program_header = program_header_begin[header_index];
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switch (program_header.p_type) {
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case PT_INTERP:
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if (ET_DYN != elf_header.e_type) {
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dbgprintf("Found PT_INTERP header (%d) in non-DYN ELF object! What? We can't handle this!\n", header_index);
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return false;
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}
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// We checked above that file_size was >= buffer size. We only care about buffer size anyway, we're trying to read this!
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if (program_header.p_offset + program_header.p_filesz > buffer_size) {
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dbgprintf("Found PT_INTERP header (%d), but the .interp section was not within our buffer :( Your program will not be loaded today.\n", header_index);
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return false;
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}
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interpreter_path = String((const char*)&buffer[program_header.p_offset], program_header.p_filesz - 1);
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break;
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case PT_LOAD:
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case PT_DYNAMIC:
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case PT_NOTE:
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case PT_PHDR:
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case PT_TLS:
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if (program_header.p_offset + program_header.p_filesz > file_size) {
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dbgprintf("SHENANIGANS! Program header %d segment leaks beyond end of file!\n", header_index);
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return false;
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}
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if ((program_header.p_flags & PF_X) && (program_header.p_flags & PF_W)) {
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dbgprintf("SHENANIGANS! Program header %d segment is marked write and execute\n", header_index);
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return false;
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}
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break;
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default:
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// Not handling other program header types in other code so... let's not surprise them
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dbgprintf("Found program header (%d) of unrecognized type %x!\n", header_index, program_header.p_type);
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return false;
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}
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}
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return true;
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}
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StringView Image::Symbol::raw_data() const
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{
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auto& section = this->section();
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@ -203,9 +203,6 @@ public:
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VirtualAddress entry() const { return VirtualAddress(header().e_entry); }
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static bool validate_elf_header(const Elf32_Ehdr& elf_header, size_t file_size);
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static bool validate_program_headers(const Elf32_Ehdr& elf_header, size_t file_size, u8* buffer, size_t buffer_size, String& interpreter_path);
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private:
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bool parse_header();
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const char* raw_data(unsigned offset) const;
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189
Libraries/LibELF/Validation.cpp
Normal file
189
Libraries/LibELF/Validation.cpp
Normal file
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@ -0,0 +1,189 @@
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/*
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* Copyright (c) 2020, Andrew Kaster <andrewdkaster@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Assertions.h>
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#include <AK/String.h>
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#include <LibELF/exec_elf.h>
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#include <LibELF/Validation.h>
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namespace ELF {
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bool validate_elf_header(const Elf32_Ehdr& elf_header, size_t file_size)
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{
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if (!IS_ELF(elf_header)) {
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dbgputstr("File is not an ELF file.\n");
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return false;
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}
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if (ELFCLASS32 != elf_header.e_ident[EI_CLASS]) {
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dbgputstr("File is not a 32 bit ELF file.\n");
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return false;
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}
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if (ELFDATA2LSB != elf_header.e_ident[EI_DATA]) {
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dbgputstr("File is not a little endian ELF file.\n");
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return false;
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}
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if (EV_CURRENT != elf_header.e_ident[EI_VERSION]) {
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dbgprintf("File has unrecognized ELF version (%d), expected (%d)!\n", elf_header.e_ident[EI_VERSION], EV_CURRENT);
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return false;
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}
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if (ELFOSABI_SYSV != elf_header.e_ident[EI_OSABI]) {
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dbgprintf("File has unknown OS ABI (%d), expected SYSV(0)!\n", elf_header.e_ident[EI_OSABI]);
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return false;
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}
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if (0 != elf_header.e_ident[EI_ABIVERSION]) {
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dbgprintf("File has unknown SYSV ABI version (%d)!\n", elf_header.e_ident[EI_ABIVERSION]);
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return false;
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}
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if (EM_386 != elf_header.e_machine) {
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dbgprintf("File has unknown machine (%d), expected i386 (3)!\n", elf_header.e_machine);
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return false;
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}
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if (ET_EXEC != elf_header.e_type && ET_DYN != elf_header.e_type && ET_REL != elf_header.e_type) {
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dbgprintf("File has unloadable ELF type (%d), expected REL (1), EXEC (2) or DYN (3)!\n", elf_header.e_type);
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return false;
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}
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if (EV_CURRENT != elf_header.e_version) {
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dbgprintf("File has unrecognized ELF version (%d), expected (%d)!\n", elf_header.e_version, EV_CURRENT);
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return false;
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}
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if (sizeof(Elf32_Ehdr) != elf_header.e_ehsize) {
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dbgprintf("File has incorrect ELF header size..? (%d), expected (%d)!\n", elf_header.e_ehsize, sizeof(Elf32_Ehdr));
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return false;
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}
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if (elf_header.e_phoff > file_size || elf_header.e_shoff > file_size) {
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dbgprintf("SHENANIGANS! program header offset (%d) or section header offset (%d) are past the end of the file!\n",
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elf_header.e_phoff, elf_header.e_shoff);
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return false;
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}
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if (elf_header.e_phnum != 0 && elf_header.e_phoff != elf_header.e_ehsize) {
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dbgprintf("File does not have program headers directly after the ELF header? program header offset (%d), expected (%d).\n",
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elf_header.e_phoff, elf_header.e_ehsize);
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return false;
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}
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if (0 != elf_header.e_flags) {
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dbgprintf("File has incorrect ELF header flags...? (%d), expected (%d).\n", elf_header.e_flags, 0);
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return false;
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}
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if (0 != elf_header.e_phnum && sizeof(Elf32_Phdr) != elf_header.e_phentsize) {
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dbgprintf("File has incorrect program header size..? (%d), expected (%d).\n", elf_header.e_phentsize, sizeof(Elf32_Phdr));
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return false;
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}
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if (sizeof(Elf32_Shdr) != elf_header.e_shentsize) {
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dbgprintf("File has incorrect section header size..? (%d), expected (%d).\n", elf_header.e_shentsize, sizeof(Elf32_Shdr));
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return false;
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}
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size_t end_of_last_program_header = elf_header.e_phoff + (elf_header.e_phnum * elf_header.e_phentsize);
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if (end_of_last_program_header > file_size) {
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dbgprintf("SHENANIGANS! End of last program header (%d) is past the end of the file!\n", end_of_last_program_header);
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return false;
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}
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size_t end_of_last_section_header = elf_header.e_shoff + (elf_header.e_shnum * elf_header.e_shentsize);
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if (end_of_last_section_header > file_size) {
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dbgprintf("SHENANIGANS! End of last section header (%d) is past the end of the file!\n", end_of_last_section_header);
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return false;
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}
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if (elf_header.e_shstrndx >= elf_header.e_shnum) {
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dbgprintf("SHENANIGANS! Section header string table index (%d) is not a valid index given we have %d section headers!\n", elf_header.e_shstrndx, elf_header.e_shnum);
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return false;
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}
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return true;
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}
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|
||||
bool validate_program_headers(const Elf32_Ehdr& elf_header, size_t file_size, u8* buffer, size_t buffer_size, String& interpreter_path)
|
||||
{
|
||||
// Can we actually parse all the program headers in the given buffer?
|
||||
size_t end_of_last_program_header = elf_header.e_phoff + (elf_header.e_phnum * elf_header.e_phentsize);
|
||||
if (end_of_last_program_header > buffer_size) {
|
||||
dbgprintf("Unable to parse program headers from buffer, buffer too small! Buffer size: %zu, End of program headers %zu\n",
|
||||
buffer_size, end_of_last_program_header);
|
||||
return false;
|
||||
}
|
||||
|
||||
if (file_size < buffer_size) {
|
||||
dbgputstr("We somehow read more from a file than was in the file in the first place!\n");
|
||||
ASSERT_NOT_REACHED();
|
||||
}
|
||||
|
||||
size_t num_program_headers = elf_header.e_phnum;
|
||||
auto program_header_begin = (const Elf32_Phdr*)&(buffer[elf_header.e_phoff]);
|
||||
|
||||
for (size_t header_index = 0; header_index < num_program_headers; ++header_index) {
|
||||
auto& program_header = program_header_begin[header_index];
|
||||
switch (program_header.p_type) {
|
||||
case PT_INTERP:
|
||||
if (ET_DYN != elf_header.e_type) {
|
||||
dbgprintf("Found PT_INTERP header (%d) in non-DYN ELF object! What? We can't handle this!\n", header_index);
|
||||
return false;
|
||||
}
|
||||
// We checked above that file_size was >= buffer size. We only care about buffer size anyway, we're trying to read this!
|
||||
if (program_header.p_offset + program_header.p_filesz > buffer_size) {
|
||||
dbgprintf("Found PT_INTERP header (%d), but the .interp section was not within our buffer :( Your program will not be loaded today.\n", header_index);
|
||||
return false;
|
||||
}
|
||||
interpreter_path = String((const char*)&buffer[program_header.p_offset], program_header.p_filesz - 1);
|
||||
break;
|
||||
case PT_LOAD:
|
||||
case PT_DYNAMIC:
|
||||
case PT_NOTE:
|
||||
case PT_PHDR:
|
||||
case PT_TLS:
|
||||
if (program_header.p_offset + program_header.p_filesz > file_size) {
|
||||
dbgprintf("SHENANIGANS! Program header %d segment leaks beyond end of file!\n", header_index);
|
||||
return false;
|
||||
}
|
||||
if ((program_header.p_flags & PF_X) && (program_header.p_flags & PF_W)) {
|
||||
dbgprintf("SHENANIGANS! Program header %d segment is marked write and execute\n", header_index);
|
||||
return false;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
// Not handling other program header types in other code so... let's not surprise them
|
||||
dbgprintf("Found program header (%d) of unrecognized type %x!\n", header_index, program_header.p_type);
|
||||
return false;
|
||||
}
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
} // end namespace ELF
|
||||
36
Libraries/LibELF/Validation.h
Normal file
36
Libraries/LibELF/Validation.h
Normal file
|
|
@ -0,0 +1,36 @@
|
|||
/*
|
||||
* Copyright (c) 2020, Andrew Kaster <andrewdkaster@gmail.com>
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright notice, this
|
||||
* list of conditions and the following disclaimer.
|
||||
*
|
||||
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
||||
* this list of conditions and the following disclaimer in the documentation
|
||||
* and/or other materials provided with the distribution.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
||||
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
||||
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <LibELF/exec_elf.h>
|
||||
|
||||
namespace ELF {
|
||||
|
||||
bool validate_elf_header(const Elf32_Ehdr& elf_header, size_t file_size);
|
||||
bool validate_program_headers(const Elf32_Ehdr& elf_header, size_t file_size, u8* buffer, size_t buffer_size, String& interpreter_path);
|
||||
|
||||
} // end namespace ELF
|
||||
Loading…
Reference in a new issue