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Correct default for Binary::has_nx on ppc64
From the Linux kernel source:
* This is the default if a program doesn't have a PT_GNU_STACK
* program header entry. The PPC64 ELF ABI has a non executable stack
* stack by default, so in the absence of a PT_GNU_STACK program header
* we turn execute permission off.
This patch can be dropped the next time we update LIEF.
diff --git a/src/ELF/Binary.cpp b/src/ELF/Binary.cpp
index a90be1ab..fd2d9764 100644
--- a/src/ELF/Binary.cpp
+++ b/src/ELF/Binary.cpp
@@ -1084,7 +1084,12 @@ bool Binary::has_nx() const {
return segment->type() == SEGMENT_TYPES::PT_GNU_STACK;
});
if (it_stack == std::end(segments_)) {
- return false;
+ if (header().machine_type() == ARCH::EM_PPC64) {
+ // The PPC64 ELF ABI has a non-executable stack by default.
+ return true;
+ } else {
+ return false;
+ }
}
return !(*it_stack)->has(ELF_SEGMENT_FLAGS::PF_X);
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