From 7cb765173c4f8da6d1349e72775c9fe9851295e6 Mon Sep 17 00:00:00 2001
From: Sergey Bugaev <bugaevc@serenityos.org>
Date: Sun, 3 Sep 2023 22:11:39 +0300
Subject: [PATCH] LibELF: Fix building without PTHREAD_STACK_MIN defined

It may or may not be defined according to Dr. POSIX.
Also, sneak in a little fix for passing a 64-bit value into a
size_t-typed argument.
---
 Userland/Libraries/LibELF/Validation.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Userland/Libraries/LibELF/Validation.cpp b/Userland/Libraries/LibELF/Validation.cpp
index 8e5da1cc4d..2d898678c6 100644
--- a/Userland/Libraries/LibELF/Validation.cpp
+++ b/Userland/Libraries/LibELF/Validation.cpp
@@ -264,7 +264,7 @@ ErrorOr<bool> validate_program_headers(ElfW(Ehdr) const& elf_header, size_t file
                 return false;
             }
             if (interpreter_path_builder)
-                TRY(interpreter_path_builder->try_append({ buffer.offset(program_header.p_offset), program_header.p_filesz - 1 }));
+                TRY(interpreter_path_builder->try_append({ buffer.offset(program_header.p_offset), static_cast<size_t>(program_header.p_filesz) - 1 }));
             break;
         case PT_LOAD:
         case PT_DYNAMIC:
@@ -295,7 +295,11 @@ ErrorOr<bool> validate_program_headers(ElfW(Ehdr) const& elf_header, size_t file
             }
 
             if (program_header.p_memsz != 0) {
-                if (program_header.p_memsz < static_cast<unsigned>(PTHREAD_STACK_MIN) || program_header.p_memsz > static_cast<unsigned>(PTHREAD_STACK_MAX)) {
+                if (
+#ifdef PTHREAD_STACK_MIN
+                    program_header.p_memsz < static_cast<unsigned>(PTHREAD_STACK_MIN) ||
+#endif
+                    program_header.p_memsz > static_cast<unsigned>(PTHREAD_STACK_MAX)) {
                     if (verbose)
                         dbgln("PT_GNU_STACK defines an unacceptable stack size.");
                     return false;