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Add GNU Property Note

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This commit is contained in:
Charisee 2023-05-05 18:32:20 +00:00
parent cb4f8153d8
commit 68a5bb4de1
3 changed files with 33 additions and 11 deletions
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26
compiler/rustc_codegen_ssa/src/back/metadata.rs
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@ -98,6 +98,7 @@ fn add_gnu_property_note(
file: &mut write::Object<'static>,
architecture: Architecture,
binary_format: BinaryFormat,
endianness: Endianness,
) {
// check bti protection
if binary_format != BinaryFormat::Elf
@ -115,12 +116,12 @@ fn add_gnu_property_note(
let n_namsz: u32 = 4; // Size of the n_name field
let n_descsz: u32 = 16; // Size of the n_desc field
let n_type: u32 = NT_GNU_PROPERTY_TYPE_0; // Type of note descriptor
let values = [n_namsz, n_descsz, n_type];
values.map(|v| data.extend_from_slice(&(v.to_le_bytes())));
data.push(b'G'); // Owner of the program property note
data.push(b'N');
data.push(b'U');
data.push(0);
let header_values = [n_namsz, n_descsz, n_type];
match endianness {
Endianness::Little => header_values.map(|v| data.extend_from_slice(&(v.to_le_bytes()))),
Endianness::Big => header_values.map(|v| data.extend_from_slice(&(v.to_be_bytes()))),
};
data.extend_from_slice(b"GNU\0"); // Owner of the program property note
let pr_type: u32 = match architecture {
Architecture::X86_64 => 0xc0000002,
Architecture::Aarch64 => 0xc0000000,
@ -128,10 +129,13 @@ fn add_gnu_property_note(
};
let pr_datasz: u32 = 4; //size of the pr_data field
let pr_data: u32 = 3; //program property descriptor
let pr_padding: u32 = 3;
let values = [pr_type, pr_datasz, pr_data, pr_padding];
values.map(|v| data.extend_from_slice(&(v.to_le_bytes())));
file.append_section_data(section, &data, 4);
let pr_padding: u32 = 0;
let property_values = [pr_type, pr_datasz, pr_data, pr_padding];
match endianness {
Endianness::Little => property_values.map(|v| data.extend_from_slice(&(v.to_le_bytes()))),
Endianness::Big => property_values.map(|v| data.extend_from_slice(&(v.to_be_bytes()))),
};
file.append_section_data(section, &data, 8);
}
pub(crate) fn create_object_file(sess: &Session) -> Option<write::Object<'static>> {
@ -246,7 +250,7 @@ pub(crate) fn create_object_file(sess: &Session) -> Option<write::Object<'static
_ => elf::ELFOSABI_NONE,
};
let abi_version = 0;
add_gnu_property_note(&mut file, architecture, binary_format);
add_gnu_property_note(&mut file, architecture, binary_format, endianness);
file.flags = FileFlags::Elf { os_abi, abi_version, e_flags };
Some(file)
}

15
tests/run-make/branch-protection-check-IBT/Makefile Normal file
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@ -0,0 +1,15 @@
# Check for GNU Property Note
include ../tools.mk
# How to run this
# python3 x.py test --target x86_64-unknown-linux-gnu tests/run-make/branch-protection-check-IBT/
# only-x86_64
all:
ifeq ($(filter x86,$(LLVM_COMPONENTS)),x86_64)
$(RUSTC) --target x86_64-unknown-linux-gnu -Z cf-protection=branch -L$(TMPDIR) -C link-args='-nostartfiles' -C save-temps ./main.rs -o $(TMPDIR)/rsmain
readelf -nW $(TMPDIR)/rsmain | $(CGREP) -e ".note.gnu.property"
endif

3
tests/run-make/branch-protection-check-IBT/main.rs Normal file
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@ -0,0 +1,3 @@
fn main() {
println!("hello world");
}