sanitizers
miri
sanitizers | miri | |
---|---|---|
54 | 123 | |
11,472 | 4,488 | |
0.8% | 2.9% | |
7.8 | 10.0 | |
2 months ago | 5 days ago | |
C | Rust | |
GNU General Public License v3.0 or later | Apache License 2.0 |
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sanitizers
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Logging all C++ destructors, poor mans run-time tracing
ASAN also checks for memory leaks like valgrind, the main difference with the tools is whether you can recompile all of libraries to get the compiler support for detection or whether binary instrumentation is better (https://github.com/google/sanitizers/wiki/AddressSanitizerLe...)
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Twenty Years of Valgrind
I like Valgrind, but day-to-day, I find myself typically reaching for Sanitizers[1] instead (ASan, et. al.), especially since they're built-in to many compilers these days, and are a bit faster IME.
Are there any use cases that people here have experienced where Valgrind is their first choice?
[1] https://github.com/google/sanitizers
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Code Smell 260 - Crowdstrike NULL
Use address sanitizers
- The sad state of property-based testing libraries
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Trip C++Now 2024 – think-cell
While shipping debug symbols is something I recommend and has no side-effects aside from mere file-size (debug symbols are only loaded when used).
[1] https://github.com/google/sanitizers/issues/857
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Good resources for learning C in depth?
AddressSanitizer is really useful, it's similar to Valgrind but has much lower overhead.
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Memory Allocators
And if you're up for it, I'd further recommend adding some ways to deal with buffer overflows in debug builds. The way I deal with this is by using Address-Sanitizer's manual poisoning api. Bonus point if you leave additional poisoned space between allocations so off by one errors are likely to end up in a poisoned region instead of nearby allocation.
- Exception thrown: write access violation
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2023 Stack Overflow Survey: Rust is the most admired programming language, making it the most loved language for 8 years in a row
It also doesn't hurt that Miri can find many kinds of unsafe violations even in unsafe blocks. Zig may get something like this one day, but even if it does, checking things at runtime is not a substitute for compile time -- the C++ Sanitizers haven't exactly solved the safety story for C++ even over a decade later.
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What's the best thing you've found in code? :
This is where stuff like ASan is really useful.
miri
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DARPA: Translating All C to Rust (Tractor)
The one link for those who think that Rewrite it all in Rust will, well, settle any debates: https://github.com/rust-lang/miri/
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Rust: Box Is a Unique Type
>While we are many missing language features away from this being the case, the noalias case is also magic descended upon box itself, with no user code ever having access to it.
I'm not sure why the author thinks there's magic behind Box. Box is not a special case of `noalias`. Run this snippet with miri and you'll see the same issue: https://play.rust-lang.org/?version=stable&mode=debug&editio...
`Box` _does_ have an expectation that its inner pointer is not aliased to another Box (even if used for readonly operations). See: https://github.com/rust-lang/miri/issues/1800#issuecomment-8...)
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Bytecode VMs in Surprising Places
Miri [0] is an interpreter for the mid-level intermediate representation (MIR) generated by the Rust compiler. MIR is input for more processing steps of the compiler. However miri also runs MIR directly. This means miri is a VM. Of course it's not a bytecode VM, because MIR is not a bytecode AFAIK. I still think that miri is a interesting example.
And why does miri exist?
It is a lot slower. However it can check for some undefined behavior.
[0]: https://github.com/rust-lang/miri
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RFC: Rust Has Provenance
Provenance is a dynamic property of pointer values. The actual underlying rules that a program must follow, even when using raw pointers and `unsafe`, are written in terms of provenance. Miri (https://github.com/rust-lang/miri) represents provenance as an actual value stored alongside each pointer's address, so it can check for violations of these rules.
Lifetimes are a static approximation of provenance. They are erased after being validated by the borrow checker, and do not exist in Miri or have any impact on what transformations the optimizer may perform. In other words, the provenance rules allow a superset of what the borrow checker allows.
- Mir: Strongly typed IR to implement fast and lightweight interpreters and JITs
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Running rustc in a browser
There has been discussion of doing this with MIRI, which would be easier than all of rustc.
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Piecemeal dropping of struct members causes UB? (Miri)
This issue has been fixed: https://github.com/rust-lang/miri/issues/2964
- Erroneous UB Error with Miri?
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I've incidentally created one of the fastest bounded MPSC queue
Actually, I've done more advanced tests with MIRI (see https://github.com/rust-lang/miri/issues/2920 for example) which allowed me to fix some issues. I've also made the code compatible with loom, but I didn't found the time yet to write and execute loom tests. That's on the TODO-list, and I need to track it with an issue too.
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Interested in "secure programming languages", both theory and practice but mostly practice, where do I start?
He is one of the big brains behind Miri, which is a interpreter that runs on the MIR (compiler representation between human code and asm/machine code) and detects undefined behavior. Super useful tool for language safety, pretty interesting on its own.
What are some alternatives?
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