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Fix string::replace under ASan #3884

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Merged
StephanTLavavej merged 3 commits into from
Jul 20, 2023
Merged

Fix string::replace under ASan #3884

StephanTLavavej merged 3 commits into from
Jul 20, 2023

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@strega-nil-ms strega-nil-ms commented Jul 17, 2023

Fixes #3883

@strega-nil-ms strega-nil-ms requested a review from a team as a code owner July 17, 2023 21:58
@CaseyCarter CaseyCarter added the bug Something isn't working label Jul 17, 2023
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CaseyCarter reviewed Jul 17, 2023
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@StephanTLavavej StephanTLavavej added the ASan Address Sanitizer label Jul 18, 2023
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StephanTLavavej reviewed Jul 18, 2023
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StephanTLavavej approved these changes Jul 18, 2023
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stl/inc/xstring
Comment on lines 3809 to 3811
const auto _New_size = _Old_size + _Count - _Nx;
_ASAN_STRING_MODIFY(*this, _Old_size, _New_size);
_ASAN_STRING_REMOVE(*this);
_Mypair._Myval2._Mysize = _New_size;
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@StephanTLavavej StephanTLavavej Jul 18, 2023

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No change requested: We could fuse _New_size now, or move its definition below the _ASAN_STRING_REMOVE. This is fine as-is though.

@StephanTLavavej StephanTLavavej self-assigned this Jul 20, 2023
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StephanTLavavej commented Jul 20, 2023

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

@StephanTLavavej StephanTLavavej merged commit 8a93121 into microsoft:main Jul 20, 2023
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StephanTLavavej commented Jul 20, 2023

Thanks for this important ASAN fix! 🐞 🛠️ 🎉

@strega-nil-ms strega-nil-ms deleted the asan-string-replace branch July 26, 2023 18:25
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@StephanTLavavej StephanTLavavej StephanTLavavej approved these changes

@zacklj89 zacklj89 zacklj89 approved these changes

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@CaseyCarter CaseyCarter CaseyCarter left review comments

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ASan Address Sanitizer bug Something isn't working

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<string>: basic_string::replace fails under ASan when pos + count > size, and count2 < count

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