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Instrument C / C++ in MemorySanitizer example #68282

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Feb 5, 2020
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Instrument C / C++ in MemorySanitizer example #68282

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12 changes: 10 additions & 2 deletions src/doc/unstable-book/src/compiler-flags/sanitizer.md
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Expand Up @@ -96,7 +96,7 @@ Shadow byte legend (one shadow byte represents 8 application bytes):
## MemorySanitizer

Use of uninitialized memory. Note that we are using `-Zbuild-std` to instrument
standard library, and passing `-msan-track-origins=2` to the LLVM to track
the standard library, and passing `-Zsanitizer-track-origins` to track the
origins of uninitialized memory:

```shell
Expand All @@ -111,7 +111,15 @@ fn main() {
}
}

$ env RUSTFLAGS="-Zsanitizer=memory -Cllvm-args=-msan-track-origins=2" cargo -Zbuild-std run --target x86_64-unknown-linux-gnu
$ export \
CC=clang \
CXX=clang++ \
CFLAGS='-fsanitize=memory -fsanitize-memory-track-origins' \
CXXFLAGS='-fsanitize=memory -fsanitize-memory-track-origins' \
RUSTFLAGS='-Zsanitizer=memory -Zsanitizer-memory-track-origins' \
RUSTDOCFLAGS='-Zsanitizer=memory -Zsanitizer-memory-track-origins'
$ cargo clean
$ cargo -Zbuild-std run --target x86_64-unknown-linux-gnu
==9416==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x560c04f7488a in core::fmt::num::imp::fmt_u64::haa293b0b098501ca $RUST/build/x86_64-unknown-linux-gnu/stage1/lib/rustlib/src/rust/src/libcore/fmt/num.rs:202:16
...
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