cefce17ac4
Rust code is currently not instrumented properly when KCOV is enabled. Thus, add the relevant flags to perform instrumentation correctly. This is necessary for efficient fuzzing of Rust code. The sanitizer-coverage features of LLVM have existed for long enough that they are available on any LLVM version supported by rustc, so we do not need any Kconfig feature detection. The coverage level is set to 3, as that is the level needed by trace-pc. We do not instrument `core` since when we fuzz the kernel, we are looking for bugs in the kernel, not the Rust stdlib. Link: https://lkml.kernel.org/r/20250501-rust-kcov-v2-1-b71e83e9779f@google.com Signed-off-by: Alice Ryhl <aliceryhl@google.com> Co-developed-by: Matthew Maurer <mmaurer@google.com> Signed-off-by: Matthew Maurer <mmaurer@google.com> Reviewed-by: Alexander Potapenko <glider@google.com> Tested-by: Aleksandr Nogikh <nogikh@google.com> Acked-by: Miguel Ojeda <ojeda@kernel.org> Cc: Andreas Hindborg <a.hindborg@kernel.org> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Benno Lossin <benno.lossin@proton.me> Cc: Bill Wendling <morbo@google.com> Cc: Björn Roy Baron <bjorn3_gh@protonmail.com> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Danilo Krummrich <dakr@kernel.org> Cc: Dmitriy Vyukov <dvyukov@google.com> Cc: Gary Guo <gary@garyguo.net> Cc: Justin Stitt <justinstitt@google.com> Cc: Masahiro Yamada <masahiroy@kernel.org> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Trevor Gross <tmgross@umich.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Bug: 415728700 (cherry picked from commit 3bf67171e98272c918a41b899070e6e86741adc8) Change-Id: I62d7b7ee9fc4b9ebd4cfa26870bd81f62c459210 Signed-off-by: Alice Ryhl <aliceryhl@google.com>
13 lines
639 B
Makefile
13 lines
639 B
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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kcov-flags-$(CONFIG_CC_HAS_SANCOV_TRACE_PC) += -fsanitize-coverage=trace-pc
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kcov-flags-$(CONFIG_KCOV_ENABLE_COMPARISONS) += -fsanitize-coverage=trace-cmp
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kcov-flags-$(CONFIG_GCC_PLUGIN_SANCOV) += -fplugin=$(objtree)/scripts/gcc-plugins/sancov_plugin.so
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kcov-rflags-y += -Cpasses=sancov-module
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kcov-rflags-y += -Cllvm-args=-sanitizer-coverage-level=3
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kcov-rflags-y += -Cllvm-args=-sanitizer-coverage-trace-pc
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kcov-rflags-$(CONFIG_KCOV_ENABLE_COMPARISONS) += -Cllvm-args=-sanitizer-coverage-trace-compares
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export CFLAGS_KCOV := $(kcov-flags-y)
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export RUSTFLAGS_KCOV := $(kcov-rflags-y)
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