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IanPudney (Ian Eldred Pudney)
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User Since
Jul 24 2020, 3:05 PM (53 w, 2 d)

Recent Activity

Jan 11 2021

IanPudney added a comment to D93879: Add LLVMFuzzerAddToDictionary.

Dor1s, what do you suggest? I haven't been able to find a good way to pass this information to libFuzzer without extending the API. The best we came up with was to simulate a memcmp(), but it didn't seem to work very well.

Jan 11 2021, 7:46 AM · Restricted Project

Dec 31 2020

IanPudney added a comment to D93879: Add LLVMFuzzerAddToDictionary.

I'll tell you more about my use-case with Atheris. In Python, it's very common for control flow to be decided by regular expressions. However, regular expression matching is implemented inside of CPython, in the _sre.c module. This means that unless CPython itself is compiled with coverage, re.match() appears as an atomic operation that libFuzzer has no insight into.

Dec 31 2020, 9:29 AM · Restricted Project

Dec 28 2020

IanPudney requested review of D93879: Add LLVMFuzzerAddToDictionary.
Dec 28 2020, 5:22 PM · Restricted Project
IanPudney abandoned D84947: Add libFuzzer shared object build output.
Dec 28 2020, 5:11 PM · Restricted Project, Restricted Project

Aug 11 2020

IanPudney added inline comments to D85797: Fix sigaction interceptor to always correctly populate oldact.
Aug 11 2020, 10:50 PM · Restricted Project
IanPudney updated the diff for D85797: Fix sigaction interceptor to always correctly populate oldact.
Aug 11 2020, 10:49 PM · Restricted Project
IanPudney requested review of D85797: Fix sigaction interceptor to always correctly populate oldact.
Aug 11 2020, 5:07 PM · Restricted Project

Aug 5 2020

IanPudney added inline comments to D84947: Add libFuzzer shared object build output.
Aug 5 2020, 1:38 PM · Restricted Project, Restricted Project
IanPudney abandoned D85339: Fix libFuzzer build issue with -lstdc++ on Darwin.
Aug 5 2020, 12:57 PM · Restricted Project
IanPudney reopened D84947: Add libFuzzer shared object build output.
Aug 5 2020, 12:44 PM · Restricted Project, Restricted Project
IanPudney updated the diff for D84947: Add libFuzzer shared object build output.

Updated to use -lc++ instead of lstdc++ on Darwin.

Aug 5 2020, 12:43 PM · Restricted Project, Restricted Project
IanPudney added inline comments to D84947: Add libFuzzer shared object build output.
Aug 5 2020, 12:29 PM · Restricted Project, Restricted Project
IanPudney requested review of D85339: Fix libFuzzer build issue with -lstdc++ on Darwin.
Aug 5 2020, 12:28 PM · Restricted Project

Aug 4 2020

IanPudney updated the diff for D84947: Add libFuzzer shared object build output.

Issue fixed.

Aug 4 2020, 6:20 PM · Restricted Project, Restricted Project
IanPudney planned changes to D84947: Add libFuzzer shared object build output.

While this now builds with Ninja, there are some rtti-related issues with linking.

Aug 4 2020, 5:59 PM · Restricted Project, Restricted Project
IanPudney updated the diff for D84947: Add libFuzzer shared object build output.
Aug 4 2020, 5:23 PM · Restricted Project, Restricted Project
IanPudney updated the diff for D84947: Add libFuzzer shared object build output.

Adjusted rule to skip -z,defs when building under Ninja.

Aug 4 2020, 3:28 PM · Restricted Project, Restricted Project
IanPudney added a comment to D84947: Add libFuzzer shared object build output.

So it looks like the bug in question was pre-existing, and this change just exposes it. Specifically, when building with Ninja instead of Makefiles, the code path for statically linking libc++ isn't actually hit. Rather, the fallthrough "normal" code path is hit. I've confirmed this by verifying that the assemblies produced before my change with Ninja still want regular libc++.

Aug 4 2020, 1:42 PM · Restricted Project, Restricted Project

Aug 3 2020

IanPudney updated the diff for D84947: Add libFuzzer shared object build output.

Updated to skip building i386 output, but to statically link libc++.

Aug 3 2020, 10:15 AM · Restricted Project, Restricted Project

Jul 30 2020

IanPudney added a comment to D84947: Add libFuzzer shared object build output.

Sticking just with x86_64 is possible; I actually have the code for that here, but it's a bit ugly:
https://reviews.llvm.org/differential/diff/281467/

Jul 30 2020, 3:42 PM · Restricted Project, Restricted Project
IanPudney requested review of D84947: Add libFuzzer shared object build output.
Jul 30 2020, 7:13 AM · Restricted Project, Restricted Project

Jul 24 2020

IanPudney updated the diff for D84561: Replace fuzzer::FuzzerDriver's INTERFACE marking with new LLVMRunFuzzerDriver..

Removed changes that were already made in a previous change, and adds docs.

Jul 24 2020, 4:13 PM · Restricted Project, Restricted Project
Herald added a project to D84561: Replace fuzzer::FuzzerDriver's INTERFACE marking with new LLVMRunFuzzerDriver.: Restricted Project.
Jul 24 2020, 3:26 PM · Restricted Project, Restricted Project