LibELF: Check for missing PT_LOAD alignment header value

This ensures we dont divide by zero when checking for valid alignment
values.

Userland/Libraries/LibELF/Validation.cpp

@@ -237,14 +237,18 @@ bool validate_program_headers(const ElfW(Ehdr) & elf_header, size_t file_size, c
  }
 
  if (elf_header.e_type != ET_CORE) {
+ if (program_header.p_type == PT_LOAD && program_header.p_align == 0) {
+ if (verbose)
+ dbgln("Program header ({}) with p_type PT_LOAD missing p_align (p_align == 0)", header_index);
+ return false;
+ }
+
  if (program_header.p_type == PT_LOAD && program_header.p_align % (size_t)PAGE_SIZE != 0) {
  if (verbose)
  dbgln("Program header ({}) with p_type PT_LOAD has p_align ({}) not divisible by page size ({})", header_index, program_header.p_align, PAGE_SIZE);
  return false;
  }
- }
 
- if (elf_header.e_type != ET_CORE) {
  if (program_header.p_type == PT_LOAD && program_header.p_vaddr % program_header.p_align != program_header.p_offset % program_header.p_align) {
  if (verbose)
  dbgln("Program header ({}) with p_type PT_LOAD has mis-aligned p_vaddr ({:x})", header_index, program_header.p_vaddr);