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x86/rust: support MITIGATION_SLS

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Support `MITIGATION_SLS` by enabling the target features that Clang does.

Without this, `objtool` would complain if enabled for Rust, e.g.:

    rust/core.o: warning: objtool:
    _R...next_up+0x44: missing int3 after ret

These should be eventually enabled via `-Ctarget-feature` when `rustc`
starts recognizing them (or via a new dedicated flag) [1].

Link: https://github.com/rust-lang/rust/issues/116851 [1]
Reviewed-by: Gary Guo <gary@garyguo.net>
Tested-by: Alice Ryhl <aliceryhl@google.com>
Tested-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20240725183325.122827-5-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Miguel Ojeda 2024-07-25 20:33:21 +02:00
parent d7868550d5
commit fc582dfc1f
1 changed files with 8 additions and 0 deletions
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8
scripts/generate_rust_target.rs
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@ -173,6 +173,14 @@ fn main() {
features += ",+retpoline-indirect-branches";
features += ",+retpoline-indirect-calls";
}
if cfg.has("MITIGATION_SLS") {
// The kernel uses `-mharden-sls=all`, which Clang maps to both these target features in
// `clang/lib/Driver/ToolChains/Arch/X86.cpp`. These should be eventually enabled via
// `-Ctarget-feature` when `rustc` starts recognizing them (or via a new dedicated
// flag); see https://github.com/rust-lang/rust/issues/116851.
features += ",+harden-sls-ijmp";
features += ",+harden-sls-ret";
}
ts.push("features", features);
ts.push("llvm-target", "x86_64-linux-gnu");
ts.push("target-pointer-width", "64");