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Rollup merge of #68282 - tmiasko:sanitizer-example, r=steveklabnik

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Instrument C / C++ in MemorySanitizer example

Modify the example to instrument C / C++ in addition to Rust, since it
will be generally required (e.g., when using libbacktrace for symbolication).
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Dylan DPC 2020-02-04 21:51:48 +01:00 • committed by GitHub
commit 1921fc0994
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12
src/doc/unstable-book/src/compiler-flags/sanitizer.md
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@ -170,7 +170,7 @@ 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
@ -185,7 +185,15 @@ 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
...