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Fix string::replace under ASan #3884

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merged 3 commits into from
Jul 20, 2023
Merged

Fix string::replace under ASan #3884

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980a23a
oh no i see what happened
strega-nil Jul 17, 2023
e3e98ee
add tests
strega-nil Jul 17, 2023
08f1279
Fuse into GH_002030_asan_annotate_string, assert result.
StephanTLavavej Jul 18, 2023
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3 changes: 2 additions & 1 deletion stl/inc/xstring
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Original file line number Diff line number Diff line change
Expand Up @@ -3807,12 +3807,13 @@ public:
// either we are shrinking, or the growth fits
// may temporarily overflow; OK because size_type must be unsigned
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;
Comment on lines 3809 to 3811
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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.

_Elem* const _Old_ptr = _Mypair._Myval2._Myptr();
_Elem* const _Insert_at = _Old_ptr + _Off;
_Traits::move(_Insert_at + _Count, _Insert_at + _Nx, _Old_size - _Nx - _Off + 1);
_Traits::assign(_Insert_at, _Count, _Ch);
_ASAN_STRING_CREATE(*this);
return *this;
}

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57 changes: 57 additions & 0 deletions tests/std/tests/GH_003883_replace_asan_failure/env.lst
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# Copyright (c) Microsoft Corporation.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

# This test matrix is the usual test matrix, with all currently unsupported options removed, crossed with the ASan flags.

# TRANSITION, google/sanitizers#328 - clang-cl does not currently support targeting /MDd or /MTd.
RUNALL_INCLUDE ..\prefix.lst
RUNALL_CROSSLIST
PM_CL="/Zi /wd4611 /w14640 /Zc:threadSafeInit-" PM_LINK="/debug"
RUNALL_CROSSLIST
PM_CL="-fsanitize=address /BE /c /EHsc /MD /std:c++14"
PM_CL="-fsanitize=address /BE /c /EHsc /MDd /std:c++17 /permissive-"
PM_CL="-fsanitize=address /BE /c /EHsc /MT /std:c++20 /permissive-"
PM_CL="-fsanitize=address /BE /c /EHsc /MTd /std:c++latest /permissive-"
PM_CL="-fsanitize=address /EHsc /MD /std:c++14"
PM_CL="-fsanitize=address /EHsc /MD /std:c++17"
PM_CL="-fsanitize=address /EHsc /MD /std:c++20"
PM_CL="-fsanitize=address /EHsc /MD /std:c++latest /permissive- /Zc:char8_t- /Zc:preprocessor"
PM_CL="-fsanitize=address /EHsc /MD /std:c++latest /permissive- /Zc:noexceptTypes-"
PM_CL="-fsanitize=address /EHsc /MDd /std:c++14 /fp:except /Zc:preprocessor"
PM_CL="-fsanitize=address /EHsc /MDd /std:c++17 /permissive-"
PM_CL="-fsanitize=address /EHsc /MDd /std:c++20 /permissive-"
PM_CL="-fsanitize=address /EHsc /MDd /std:c++latest /permissive- /Zc:wchar_t-"
PM_CL="-fsanitize=address /EHsc /MDd /std:c++latest /permissive-"
PM_CL="-fsanitize=address /EHsc /MT /std:c++latest /permissive- /analyze:only /analyze:autolog-"
PM_CL="-fsanitize=address /EHsc /MT /std:c++latest /permissive-"
PM_CL="-fsanitize=address /EHsc /MTd /std:c++latest /permissive"
PM_CL="-fsanitize=address /EHsc /MTd /std:c++latest /permissive- /analyze:only /analyze:autolog-"
PM_CL="-fsanitize=address /EHsc /MTd /std:c++latest /permissive- /fp:strict"
PM_CL="-fsanitize=address /EHsc /MTd /std:c++latest /permissive-"
PM_CL="/D_ANNOTATE_STRING /BE /c /EHsc /MD /std:c++14"
PM_CL="/D_ANNOTATE_STRING /BE /c /EHsc /MDd /std:c++17 /permissive-"
PM_CL="/D_ANNOTATE_STRING /BE /c /EHsc /MT /std:c++20 /permissive-"
PM_CL="/D_ANNOTATE_STRING /BE /c /EHsc /MTd /std:c++latest /permissive-"
PM_CL="/D_ANNOTATE_STRING /EHsc /MD /std:c++14"
PM_CL="/D_ANNOTATE_STRING /EHsc /MD /std:c++14 /Zc:char8_t"
PM_CL="/D_ANNOTATE_STRING /EHsc /MD /std:c++17"
PM_CL="/D_ANNOTATE_STRING /EHsc /MD /std:c++17 /Zc:char8_t"
PM_CL="/D_ANNOTATE_STRING /EHsc /MD /std:c++20"
PM_CL="/D_ANNOTATE_STRING /EHsc /MD /std:c++latest /permissive- /Zc:char8_t- /Zc:preprocessor"
PM_CL="/D_ANNOTATE_STRING /EHsc /MD /std:c++latest /permissive- /Zc:noexceptTypes-"
PM_CL="/D_ANNOTATE_STRING /EHsc /MDd /std:c++14 /fp:except /Zc:preprocessor"
PM_CL="/D_ANNOTATE_STRING /EHsc /MDd /std:c++17 /permissive-"
PM_CL="/D_ANNOTATE_STRING /EHsc /MDd /std:c++20 /permissive-"
PM_CL="/D_ANNOTATE_STRING /EHsc /MDd /std:c++latest /permissive- /Zc:wchar_t-"
PM_CL="/D_ANNOTATE_STRING /EHsc /MDd /std:c++latest /permissive-"
PM_CL="/D_ANNOTATE_STRING /EHsc /MT /std:c++latest /permissive- /analyze:only /analyze:autolog-"
PM_CL="/D_ANNOTATE_STRING /EHsc /MT /std:c++latest /permissive-"
PM_CL="/D_ANNOTATE_STRING /EHsc /MTd /std:c++latest /permissive"
PM_CL="/D_ANNOTATE_STRING /EHsc /MTd /std:c++latest /permissive- /analyze:only /analyze:autolog-"
PM_CL="/D_ANNOTATE_STRING /EHsc /MTd /std:c++latest /permissive- /fp:strict"
PM_CL="/D_ANNOTATE_STRING /EHsc /MTd /std:c++latest /permissive-"
# TRANSITION, clang-cl does not support /alternatename so we cannot test /D_ANNOTATE_STRING without -fsanitize=address
PM_COMPILER="clang-cl" PM_CL="-fsanitize=address -fno-ms-compatibility -fno-delayed-template-parsing -Wno-unqualified-std-cast-call /EHsc /MD /std:c++14"
PM_COMPILER="clang-cl" PM_CL="-fsanitize=address -fno-ms-compatibility -fno-delayed-template-parsing -Wno-unqualified-std-cast-call /EHsc /MD /std:c++17"
PM_COMPILER="clang-cl" PM_CL="-fsanitize=address -fno-ms-compatibility -fno-delayed-template-parsing -Wno-unqualified-std-cast-call /EHsc /MT /std:c++20 /permissive-"
PM_COMPILER="clang-cl" PM_CL="-fsanitize=address -fno-ms-compatibility -fno-delayed-template-parsing -Wno-unqualified-std-cast-call /EHsc /MT /std:c++latest /permissive- /fp:strict"
9 changes: 9 additions & 0 deletions tests/std/tests/GH_003883_replace_asan_failure/test.cpp
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// Copyright (c) Microsoft Corporation.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#include <string>

int main() {
std::string t = "0123456789ABCDEF"; // large string
t.replace(0, 30, 7, 'A');
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}