Auto merge of #99679 - repnop:kernel-address-sanitizer, r=cuviper

Add `kernel-address` sanitizer support for freestanding targets

This PR adds support for KASan (kernel address sanitizer) instrumentation in freestanding targets. I included the minimal set of `x86_64-unknown-none`, `riscv64{imac, gc}-unknown-none-elf`, and `aarch64-unknown-none` but there's likely other targets it can be added to. (`linux_kernel_base.rs`?) KASan uses the address sanitizer attributes but has the `CompileKernel` parameter set to `true` in the pass creation.

1 files changed, 4 insertions, 0 deletions

diff --git a/compiler/rustc_codegen_llvm/src/back/write.rs b/compiler/rustc_codegen_llvm/src/back/write.rs
index fb160669436..40f0594b40d 100644
--- a/compiler/rustc_codegen_llvm/src/back/write.rs
+++ b/compiler/rustc_codegen_llvm/src/back/write.rs
@@ -442,6 +442,10 @@ pub(crate) unsafe fn llvm_optimize(
             sanitize_thread: config.sanitizer.contains(SanitizerSet::THREAD),
             sanitize_hwaddress: config.sanitizer.contains(SanitizerSet::HWADDRESS),
             sanitize_hwaddress_recover: config.sanitizer_recover.contains(SanitizerSet::HWADDRESS),
+            sanitize_kernel_address: config.sanitizer.contains(SanitizerSet::KERNELADDRESS),
+            sanitize_kernel_address_recover: config
+                .sanitizer_recover
+                .contains(SanitizerSet::KERNELADDRESS),
         })
     } else {
         None