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NoQ (Artem Dergachev)
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User Since
Sep 3 2015, 9:16 AM (228 w, 3 d)

Recent Activity

Sat, Jan 18

NoQ added a comment to D71612: [analyzer] Add PlacementNewChecker.

This looks fantastic. Let's enable by it default!

Sat, Jan 18, 6:53 AM · Restricted Project
NoQ added a comment to D28955: [analyzer] Enable support for symbolic extension/truncation.

@ddcc, sure, np!

Sat, Jan 18, 6:48 AM
NoQ added a comment to D69825: [Clang][Driver] Re-use the calling process instead of creating a new process for the cc1 invocation.

This patch breaks scan-build-py which parses the output of "-###" to get -cc1 command.

Sat, Jan 18, 6:48 AM · Restricted Project, Restricted Project

Fri, Jan 17

NoQ updated subscribers of D28955: [analyzer] Enable support for symbolic extension/truncation.

@mikhail.ramalho brought this up in pr41809 so let's revisit this.

Fri, Jan 17, 6:40 AM

Wed, Jan 15

NoQ added a comment to D72380: [DataFlow] Factor two worklist implementations out.

I'm excited about this effort!~

Wed, Jan 15, 2:43 PM · Restricted Project

Mon, Jan 13

NoQ added a comment to D71510: [clang][checkers] Added new checker 'error-return-checker'..

Uh-oh, what happened here?

Mon, Jan 13, 5:09 PM · Restricted Project

Fri, Jan 10

NoQ added a comment to D71612: [analyzer] Add PlacementNewChecker.

Ups, I am sorry. Now I am creating another commit which moves it to alpha. (So then, If I understand it correctly then the cplusplus is enabled by default, but alpha is not.)

Fri, Jan 10, 9:43 AM · Restricted Project
NoQ added a comment to D71612: [analyzer] Add PlacementNewChecker.

I am going to execute the analysis on LLVM/Clang as you suggested, so then we'll see what the experiment will bring us. And then we could enable it by default I think. BTW how can we do that? I could not find any default enablement related config in Checkers.td ...

Fri, Jan 10, 8:11 AM · Restricted Project

Thu, Jan 9

NoQ added a comment to D71612: [analyzer] Add PlacementNewChecker.
In D71612#1790045, @NoQ wrote:

I wonder if this checker will find any misuses of placement into llvm::TrailingObjects.

I've evaluated this checker on LLVM/Clang source and it did not find any results, though there are many placement new calls there. I think this is good, because there are no false positives.

Thu, Jan 9, 10:05 AM · Restricted Project
NoQ accepted D71612: [analyzer] Add PlacementNewChecker.
Thu, Jan 9, 10:05 AM · Restricted Project
NoQ added inline comments to D71612: [analyzer] Add PlacementNewChecker.
Thu, Jan 9, 9:36 AM · Restricted Project

Fri, Jan 3

NoQ added a comment to D72018: [attributes] [analyzer] Add an attribute to prevent checkers from modeling a function.

I expect not to have too many functions that need such exclusions. It was more about making it easier to do some exclusions without touching the analyzer. I will ask around what are the preferences of the team, maybe Artem's proposal will work for us.

Fri, Jan 3, 11:31 AM · Restricted Project
NoQ added a comment to D72018: [attributes] [analyzer] Add an attribute to prevent checkers from modeling a function.

Would changing the literal in the attribute have the same effect? I.e., acquire_handle("Fuchsia_But_Please_Ignore_Me").

Fri, Jan 3, 3:33 AM · Restricted Project

Tue, Dec 31

NoQ updated the summary of D69155: [analyzer] Fix off-by-one in operator call parameter binding..
Tue, Dec 31, 7:20 AM · Restricted Project
NoQ added inline comments to D72035: [analyzer][NFC] Use CallEvent checker callback in GenericTaintChecker.
Tue, Dec 31, 7:05 AM · Restricted Project

Mon, Dec 23

NoQ accepted D71791: [CFG] Fix an assertion failure with static initializers.

Woohoo tests!~~

Mon, Dec 23, 3:28 PM · Restricted Project

Sun, Dec 22

NoQ added a comment to D71791: [CFG] Fix an assertion failure with static initializers.

Wait, i didn't real @Szelethus's reply :)

Sun, Dec 22, 6:12 AM · Restricted Project

Sat, Dec 21

NoQ added a comment to D71791: [CFG] Fix an assertion failure with static initializers.

I am not sure what would be the best way to test this change here.

Sat, Dec 21, 7:37 PM · Restricted Project

Dec 20 2019

NoQ accepted D70470: [analyzer] Add FuchsiaHandleCheck to catch handle leaks, use after frees and double frees.

LGTM! Yeah, please update the ASCII-art, it's great and every checker should have it.

Dec 20 2019, 12:01 PM · Restricted Project
NoQ accepted D71746: Fix the "TypeError: a bytes-like object is required, not 'str'" in exploded-graph-rewriter.py on Python 3.5+.

Yay, thanks! It does seem to work on python2 after the fix.

Dec 20 2019, 11:31 AM · Restricted Project
NoQ added inline comments to D71612: [analyzer] Add PlacementNewChecker.
Dec 20 2019, 11:11 AM · Restricted Project

Dec 19 2019

NoQ created D71728: [analyzer] Add a syntactic security check for ObjC NSCoder API..
Dec 19 2019, 2:30 PM · Restricted Project
NoQ accepted D71654: [llvm] Add a way to speed up the speed in which BumpPtrAllocator increases slab sizes.

Looks straightforward and useful, i don't see any problems, LGTM!

Dec 19 2019, 12:33 PM · Restricted Project

Dec 18 2019

NoQ added a comment to D70836: [analysis] Fix value tracking for pointers to qualified types.

Will this also work as intended with sugared types? (e.g. typedefs)
I believe this might be one of the main reason why the original author used canonical types in the first place.

Dec 18 2019, 6:09 PM · Restricted Project
NoQ added a comment to D71612: [analyzer] Add PlacementNewChecker.

I wonder if this checker will find any misuses of placement into llvm::TrailingObjects.

Dec 18 2019, 10:45 AM · Restricted Project

Dec 17 2019

NoQ accepted D71642: [CFG] Add an option to inline CXXDefaultInitExpr into aggregate initialization.

Even though this is probably not the right solution for the static analyzer use-case (because we may end up having duplicate expressions in the CFG), it might actually make the static analyzer perform better than before (because it's still better than not having these expressions at all in the CFG). I guess we could experiment.

Dec 17 2019, 5:48 PM · Restricted Project
NoQ added inline comments to D71642: [CFG] Add an option to inline CXXDefaultInitExpr into aggregate initialization.
Dec 17 2019, 5:29 PM · Restricted Project
NoQ added inline comments to D71612: [analyzer] Add PlacementNewChecker.
Dec 17 2019, 1:19 PM · Restricted Project

Dec 14 2019

NoQ added a comment to D71433: [analyzer] CERT: POS34-C.

@NoQ I like the idea, but I am not really sure how to do that. I started working on Static Analyzer just lask week.

Dec 14 2019, 6:43 PM · Restricted Project

Dec 13 2019

NoQ added inline comments to D66049: [analyzer] PR41729: Fix some false positives and improve strlcat and strlcpy modeling.
Dec 13 2019, 6:10 PM · Restricted Project
NoQ added a comment to D71433: [analyzer] CERT: POS34-C.

Thanks! This looks like a simple and efficient check. I have one overall suggestion.

Dec 13 2019, 2:06 PM · Restricted Project

Dec 11 2019

NoQ accepted D71371: [analyzer] Do not cache out on some shared implicit AST nodes..

Thanks!!

Dec 11 2019, 5:04 PM · Restricted Project
NoQ accepted D70878: [analyzer] Add support for namespaces to GenericTaintChecker.

Looks great but i keep worrying that you're re-inventing CallDescription which already supports this feature (and many more) and we really need a single implementation of this logic because it has been historically very annoying and bugprone. Like, if you can convert your configs to a CallDescriptionMap<> while loading that'd be awesome.

Dec 11 2019, 2:21 PM · Restricted Project
NoQ added a comment to D71371: [analyzer] Do not cache out on some shared implicit AST nodes..

I doubt we'll ever need these callbacks. I can't imagine any kind of analysis that would need them. Like, these statements have absolutely no effect on the runtime program state.

Dec 11 2019, 1:33 PM · Restricted Project
NoQ accepted D70836: [analysis] Fix value tracking for pointers to qualified types.

Hmm, it was supposed to get a green tick mark. Let me re-accept.

Dec 11 2019, 12:55 PM · Restricted Project
NoQ added inline comments to D70469: [attributes] [analyzer] Add handle related attributes.
Dec 11 2019, 12:46 PM · Restricted Project
NoQ added a comment to D71371: [analyzer] Do not cache out on some shared implicit AST nodes..

One way to criticize the current solution would be to put an InitListExpr in a loop and immediately discard it and see how states after different numbers of iterations no longer join together only because they have different NoCachingOutForConsts values.

Dec 11 2019, 12:46 PM · Restricted Project
NoQ added a comment to D71371: [analyzer] Do not cache out on some shared implicit AST nodes..

So the AST is like

|   |-DeclStmt 0x7f9f3b8932e0 <line:6:3, col:43>
|   | `-VarDecl 0x7f9f3b892f50 <col:3, col:42> col:7 used a 'int [5]' cinit
|   |   `-InitListExpr 0x7f9f3b893268 <col:14, col:42> 'int [5]'
|   |     |-array_filler: ImplicitValueInitExpr 0x7f9f3b8932d0 <<invalid sloc>> 'int'
|   |     |-IntegerLiteral 0x7f9f3b893118 <col:41> 'int' 4
|   |     |-ImplicitValueInitExpr 0x7f9f3b8932d0 <<invalid sloc>> 'int'
|   |     |-IntegerLiteral 0x7f9f3b893078 <col:31> 'int' 15
|   |     |-ImplicitValueInitExpr 0x7f9f3b8932d0 <<invalid sloc>> 'int'
|   |     `-IntegerLiteral 0x7f9f3b892fd8 <col:21> 'int' 29
Dec 11 2019, 11:48 AM · Restricted Project

Dec 10 2019

NoQ added a comment to D71322: [analyzer] CStringChecker: Fix overly eager assumption that memcmp arguments overlap..

Instead, i conservatively assume that they don't overlap, unless they're already known to certainly overlap on the current execution path. This loses a bit of coverage but the lost path is where they do actually overlap. This path is in my opinion not only rare but also fairly useless, as it immediately introduces an aliasing problem that we aren't quite ready to deal with.

Dec 10 2019, 6:55 PM · Restricted Project
NoQ updated the diff for D71322: [analyzer] CStringChecker: Fix overly eager assumption that memcmp arguments overlap..

Fair point. Yeah, i wonder what the real difference is :/ Added tests.

Dec 10 2019, 6:55 PM · Restricted Project
NoQ added a child revision for D71321: [analyzer] CStringChecker: Warning text fixes.: D71322: [analyzer] CStringChecker: Fix overly eager assumption that memcmp arguments overlap..
Dec 10 2019, 6:36 PM · Restricted Project
NoQ added a parent revision for D71322: [analyzer] CStringChecker: Fix overly eager assumption that memcmp arguments overlap.: D71321: [analyzer] CStringChecker: Warning text fixes..
Dec 10 2019, 6:36 PM · Restricted Project
NoQ created D71322: [analyzer] CStringChecker: Fix overly eager assumption that memcmp arguments overlap..
Dec 10 2019, 6:36 PM · Restricted Project
NoQ added inline comments to D66333: [analyzer] NonNullParamChecker and CStringChecker parameter number in checker message.
Dec 10 2019, 5:51 PM · Restricted Project, Restricted Project
NoQ created D71321: [analyzer] CStringChecker: Warning text fixes..
Dec 10 2019, 5:51 PM · Restricted Project
NoQ accepted D71224: [analyzer] Escape symbols stored into specific region after a conservative evalcall. .

Thanks!! Nothing controversial remains here, right? :)

Dec 10 2019, 5:14 PM · Restricted Project
NoQ added inline comments to D70805: [analyzer] SValHasDescendant: Determine whether the SVal has an SVal descendant.
Dec 10 2019, 4:36 PM · Restricted Project
NoQ added a comment to D70469: [attributes] [analyzer] Add handle related attributes.

What about __attribute__((acquire_handle("fuchsia")))?

Dec 10 2019, 4:36 PM · Restricted Project
NoQ accepted D70320: [Analyzer] [NFC] Iterator Checkers - Separate iterator modeling and the actual checkers.

I plan some refactoring but this first patch is meant to be a single separation of code.

Dec 10 2019, 4:27 PM · Restricted Project
NoQ accepted D70912: [Analyzer] Iterator Modeling: Print Container Data and Iterator Positions when printing the Program State.

Fantastic, thanks!!

Dec 10 2019, 4:18 PM · Restricted Project
NoQ accepted D70439: [Analyzer][Docs][NFC] Add CodeChecker to the command line tools.

Thanks!!~

Dec 10 2019, 4:18 PM · Restricted Project
NoQ accepted D70244: [Analyzer] Iterator Checkers: Replace `UnknownVal` in comparison result by a conjured value.

That's a fair point, these days we always have to account for unknown values.

Dec 10 2019, 4:08 PM · Restricted Project
NoQ added a comment to D71224: [analyzer] Escape symbols stored into specific region after a conservative evalcall. .

So basically what I am wonder/worrying about is the following:
The analyzer core will decide that the stack region is escaped and the checkers has no word about this.

Dec 10 2019, 3:14 PM · Restricted Project
NoQ added a comment to D71224: [analyzer] Escape symbols stored into specific region after a conservative evalcall. .

So I was wondering if we got the default right. Maybe a checker should do more work to get the escaping rather than more work preventing it?

Dec 10 2019, 2:09 PM · Restricted Project
NoQ added a comment to D71224: [analyzer] Escape symbols stored into specific region after a conservative evalcall. .

I don't think this is a good enough model currently. The problem is that, it does not play well with annotations. E.g. the checker can see a symbol escaping, but it does not have a whole lot of information how. For example, currently, there is no way to check if the output parameter through which the escape happened was annotated somehow.

Dec 10 2019, 1:42 PM · Restricted Project
NoQ added a comment to D71224: [analyzer] Escape symbols stored into specific region after a conservative evalcall. .

In any case, every checker is allowed to make their own decisions about escaping. Escape on its own is not material, it's all about how the checker reacts to escapes. Say, it's up to MallocChecker to decide whether the function may or may not release memory that escapes on call.

Dec 10 2019, 1:06 PM · Restricted Project

Dec 9 2019

NoQ added inline comments to D71155: [analyzer] CERT: STR30-C.
Dec 9 2019, 7:53 PM · Restricted Project
NoQ accepted D70725: [analyzer] Add path notes to FuchsiaHandleCheck.

Looks great, thanks!~

Dec 9 2019, 7:44 PM · Restricted Project
NoQ added a comment to D70805: [analyzer] SValHasDescendant: Determine whether the SVal has an SVal descendant.

Usually this kind of code is hard to re-use because all use cases require different definitions of "has descendant". We already have at least 3 such definitions floating around and we can't re-use them.

Dec 9 2019, 7:44 PM · Restricted Project
NoQ added a comment to D70469: [attributes] [analyzer] Add handle related attributes.

It still mildly worries me that the attributes aren't truly reusable, as the exact meaning of the attribute depends on the domain. In particular, every domain is expected to have different approaches to error handling, i.e. a function that creates or destroys a handle may fail to, respectively, create or destroy the handle, but instead indicate the failure in a domain-specific manner, eg. through magical return values or null handle or errno or whatever.

Dec 9 2019, 7:35 PM · Restricted Project
NoQ added inline comments to D71155: [analyzer] CERT: STR30-C.
Dec 9 2019, 7:26 PM · Restricted Project
NoQ accepted D71152: [analyzer] Keep track of escaped locals..

Looks great, thanks! I'd love to see what effect it immediately causes and whether there will be any true or false negatives because of this change.

Dec 9 2019, 7:08 PM · Restricted Project
NoQ added inline comments to D71224: [analyzer] Escape symbols stored into specific region after a conservative evalcall. .
Dec 9 2019, 6:59 PM · Restricted Project
NoQ added a comment to D70411: [analyzer] CERT: STR31-C.

Ok, so, what should the checker warn on? What should be the intended state machine for this checker?

Dec 9 2019, 6:04 PM · Restricted Project
NoQ added inline comments to D71224: [analyzer] Escape symbols stored into specific region after a conservative evalcall. .
Dec 9 2019, 5:45 PM · Restricted Project
NoQ added inline comments to D71224: [analyzer] Escape symbols stored into specific region after a conservative evalcall. .
Dec 9 2019, 5:16 PM · Restricted Project
NoQ added inline comments to D71224: [analyzer] Escape symbols stored into specific region after a conservative evalcall. .
Dec 9 2019, 5:01 PM · Restricted Project
NoQ added a comment to D71224: [analyzer] Escape symbols stored into specific region after a conservative evalcall. .

I think you don't need to smuggle WasConservative all the way up. It's implied that if the evaluation was not conservative, then the respective ExplodedNodeSet is going to be empty, as all nodes will be put directly into the worklist instead. Eg., checkPostCall isn't going to be invoked immediately after inlineCall, but only after enqueueEndOfFunction.

Dec 9 2019, 3:21 PM · Restricted Project
NoQ added a comment to D71224: [analyzer] Escape symbols stored into specific region after a conservative evalcall. .

Also, it looks like for example CStringChecker calls ProgramState::InvalidateRegions directly when modeling function calls. So it looks like if checkers are using evalCall, pointerEscape will not be triggered automatically. I am not sure if that would be a bug or feature :D

Dec 9 2019, 2:17 PM · Restricted Project
NoQ added inline comments to D71224: [analyzer] Escape symbols stored into specific region after a conservative evalcall. .
Dec 9 2019, 1:49 PM · Restricted Project

Dec 6 2019

NoQ added inline comments to D71152: [analyzer] Keep track of escaped locals..
Dec 6 2019, 3:57 PM · Restricted Project
NoQ added a comment to D71152: [analyzer] Keep track of escaped locals..

Hiding the trait in ExprEngine has the additional benefit of disallowing *direct* access to the trait - it can only be accessed through getters. It also doesn't prevent us from exposing the trait to checkers as a method on ProgramState in the future, because ProgramStateManager has access to SubEngine.

Dec 6 2019, 3:57 PM · Restricted Project
NoQ added a comment to D71152: [analyzer] Keep track of escaped locals..

I've been hiding these internal traits in ExprEngine lately but i don't have a strong preference. I don't see any immediate need to expose this info to the checkers, nor do i see a need to actively hide it.

Dec 6 2019, 3:57 PM · Restricted Project

Dec 5 2019

NoQ added inline comments to D70439: [Analyzer][Docs][NFC] Add CodeChecker to the command line tools.
Dec 5 2019, 6:06 PM · Restricted Project
NoQ added inline comments to D69948: [Checkers] Added support for freopen to StreamChecker..
Dec 5 2019, 5:57 PM · Restricted Project
NoQ added inline comments to D71041: [analyzer][discussion] Talk about escapes.
Dec 5 2019, 3:35 PM · Restricted Project
NoQ added inline comments to D71041: [analyzer][discussion] Talk about escapes.
Dec 5 2019, 2:45 PM · Restricted Project
NoQ added inline comments to D71041: [analyzer][discussion] Talk about escapes.
Dec 5 2019, 1:52 PM · Restricted Project
NoQ accepted D70836: [analysis] Fix value tracking for pointers to qualified types.

Thanks!! This definitely doesn't sort out all the problems of this kind, but that's a strict improvement.

Dec 5 2019, 1:43 PM · Restricted Project
NoQ added inline comments to D71041: [analyzer][discussion] Talk about escapes.
Dec 5 2019, 1:13 PM · Restricted Project

Dec 4 2019

NoQ added inline comments to D71041: [analyzer][discussion] Talk about escapes.
Dec 4 2019, 7:19 PM · Restricted Project
NoQ added inline comments to D71041: [analyzer][discussion] Talk about escapes.
Dec 4 2019, 7:01 PM · Restricted Project
NoQ added inline comments to D71041: [analyzer][discussion] Talk about escapes.
Dec 4 2019, 6:51 PM · Restricted Project
NoQ added a comment to D70411: [analyzer] CERT: STR31-C.

Dec 4 2019, 3:45 PM · Restricted Project
NoQ added a comment to D70411: [analyzer] CERT: STR31-C.

A while back I had a look into implementing some of the CERT checkers and my vague recollection from these attempts was that it's a bad idea to take CERT examples literally. Most of the CERT rules are explained in an informal natural language and it makes CERT great for demonstrating common mistakes that programmers make when they write in C/C++. Humans can easily understand the problem by reading CERT pages. But it doesn't necessarily mean that static analysis tools can be built by generalizing over the examples from the CERT wiki.

Dec 4 2019, 3:36 PM · Restricted Project
NoQ accepted D70693: [scan-build-py] Set of small fixes.

So after investigating the effects of this patch, the result is the following:

Verbose mode (-v) that also prints findings to the command line will no longer be colored after the patch.

Dec 4 2019, 1:13 PM · Restricted Project

Dec 3 2019

NoQ added a comment to D70439: [Analyzer][Docs][NFC] Add CodeChecker to the command line tools.

Hey, thanks for waiting on me! I'm slow these days, just 50 more mails to go >.<

Dec 3 2019, 7:13 PM · Restricted Project
NoQ added a comment to D70725: [analyzer] Add path notes to FuchsiaHandleCheck.

Mmm, right, i guess you should also skip adding the tag if the notes array is empty.

Dec 3 2019, 2:37 PM · Restricted Project
NoQ added a comment to D70725: [analyzer] Add path notes to FuchsiaHandleCheck.

Yay, it actually works!

Dec 3 2019, 12:35 PM · Restricted Project

Dec 2 2019

NoQ added a comment to D70725: [analyzer] Add path notes to FuchsiaHandleCheck.

Of course i mean something like this:

std::string text = note();
if (!text.empty())
  return text;

(and return something like "" on the other return path in the inner lambdas).

Dec 2 2019, 11:11 PM · Restricted Project
NoQ added a comment to D70725: [analyzer] Add path notes to FuchsiaHandleCheck.

the same call might both acquire and release handles (there are such calls in Fuchsia), so we might end up adding more than one note for a call for which we would need to add more than one transitions

Dec 2 2019, 8:04 PM · Restricted Project
NoQ added a comment to D70470: [analyzer] Add FuchsiaHandleCheck to catch handle leaks, use after frees and double frees.

I feel like the 2. is a better solution. Of course, that change might have a performance impact as well.

Dec 2 2019, 1:48 PM · Restricted Project
NoQ added a comment to D70725: [analyzer] Add path notes to FuchsiaHandleCheck.

Sooooo... note tags?

Dec 2 2019, 12:43 PM · Restricted Project

Nov 22 2019

NoQ accepted D70596: [analyzer][docs] NFC: Extend documentation for MallocOverflow checker.

Fair enough!

Nov 22 2019, 2:43 PM · Restricted Project
NoQ added a comment to D69746: [analyzer] FixItHint: Apply and test hints with the Clang Tidy's script.

This patch introduces a way to apply the fix-its by the Analyzer:

I'm not sure this option is very useful... I don't know of anyone who uses the same option in Clang or ClangTidy. The only way I know people apply fixits is with the help of IDEs. I am also skeptical that people want to apply *all* fixits. Usually people want to pick a few specific ones, or all fixits of a certain kind; but not everything.

What workflow are you thinking of for this option?

Nov 22 2019, 12:25 PM · Restricted Project
NoQ added a comment to D67149: Fix argument order for BugType instation for .

Ah, the good old "stringly typed" APIs.

Nov 22 2019, 12:16 PM · Restricted Project

Nov 21 2019

NoQ added a comment to D69962: [CFG] Fix a flaky crash in CFGBlock::getLastCondition()..

http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap-msan/builds/16031
MSan doesn't catch it >.<

Nov 21 2019, 9:54 PM · Restricted Project
NoQ added a comment to D70158: [analyzer] Fix Objective-C accessor body farms after D68108..

I'll commit in order to get rid of the crash, but i'm open for discussions :)

Nov 21 2019, 6:17 PM · Restricted Project

Nov 20 2019

NoQ added inline comments to D70470: [analyzer] Add FuchsiaHandleCheck to catch handle leaks, use after frees and double frees.
Nov 20 2019, 5:21 PM · Restricted Project
NoQ added a comment to D70411: [analyzer] CERT: STR31-C.

I think it would really help if you draw a state machine for the checker, like the ASCII-art thing in D70470; you don't need to spend a lot of time turning it into ASCII-art, a photo of a quick hand-drawn picture would be totally fine, because it's, first and foremost, for discussion :)

Nov 20 2019, 5:02 PM · Restricted Project