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From edc54894f77d00c4ca34593c8b4c94f656f5807e Mon Sep 17 00:00:00 2001
From: Frederick Cheung <frederick.cheung@gmail.com>
Date: Fri, 17 Jun 2022 18:57:28 +0100
Subject: [PATCH] Fix Pointer#initialize using NUM2LL instead of NUM2ULL
If the high bit of the address was set this would raise RangeError
(bignum too big to convert into long long). This is not uncommon on
platforms that use the high bits of pointers for purposes such as
pointer authentication
This also now matches Pointer#address which uses ULL2NUM.
---
ext/ffi_c/Pointer.c | 2 +-
spec/ffi/pointer_spec.rb | 8 ++++++++
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/ext/ffi_c/Pointer.c b/ext/ffi_c/Pointer.c
index 153fff101..79886811f 100644
--- a/ext/ffi_c/Pointer.c
+++ b/ext/ffi_c/Pointer.c
@@ -112,7 +112,7 @@ ptr_initialize(int argc, VALUE* argv, VALUE self)
switch (TYPE(rbAddress)) {
case T_FIXNUM:
case T_BIGNUM:
- p->memory.address = (void*) (uintptr_t) NUM2LL(rbAddress);
+ p->memory.address = (void*) (uintptr_t) NUM2ULL(rbAddress);
p->memory.size = LONG_MAX;
if (p->memory.address == NULL) {
p->memory.flags = 0;
diff --git a/spec/ffi/pointer_spec.rb b/spec/ffi/pointer_spec.rb
index b216a161d..7a2ac1565 100644
--- a/spec/ffi/pointer_spec.rb
+++ b/spec/ffi/pointer_spec.rb
@@ -237,6 +237,14 @@ def to_ptr
expect(FFI::Pointer.new(0).slice(0, 10).size_limit?).to be true
end
end
+
+ describe "#initialise" do
+ it 'can use adresses with high bit set' do
+ max_address = 2**FFI::Platform::ADDRESS_SIZE - 1
+ pointer = FFI::Pointer.new(:uint8, max_address)
+ expect(pointer.address).to eq(max_address)
+ end
+ end
end
describe "AutoPointer" do
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