Fix error in ACE_Process_Options::inherit_environment () #2006
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…ingly ::WideCharToMultiByte) there must be expected that the length of the ouput multi-byte string is not equal to the length of the input unicode string. That's why we the variable iter used to iterate over the original unicode environment varaiables must be increased by the source string length (and not by the length of converted string).
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Please extend one of the unit tests under ACE/tests in such a way that it reproduces the issue you found |
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The error was found in conjunction with Implementation Repository Activator. On one Chinese Windows machine the Activator could not start a managed server.
The error occurs on the step 2. The variables occupy a continuous book of memory and are separated by '\0' char in that block. Mistakenly inherit_environment() assumes that the length of the output string of ::WideCharToMultiByte equals to the length of the input string in characters, what is only try for ASCII strings. But if the input string contains characters which cannot be presented with 1 byte (like Chinese) these characters will be presented with 2 bytes in the output string and the length of this string in chars will be longer. Consider variables: They are passed to ::CreateProcess as: (Note that The name PATHEXT is cut from the result list.) ACE was built with ACE_HAS_WCHAR only. (ACE_USES_WCHAR was not defined) |
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Please extend one of the unit tests as reproducer |
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✅ Actions performedFull review triggered. |
WalkthroughThe changes update the iterator advancement in the Changes
Sequence Diagram(s)sequenceDiagram
participant Caller
participant Process as ACE_Process_Options
participant OS as ACE_OS
Caller->>Process: Call inherit_environment()
loop Process Environment Array
Process->>OS: Call ACE_OS::strlen(iter)
OS-->>Process: Return string length
Process->>Process: Increment iterator by returned length
end
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🧹 Nitpick comments (1)
ACE/ace/Process.cpp (1)
924-939: Add error handling and improve documentation.The code could benefit from:
- Error handling for memory allocation failures
- Documentation explaining the multi-byte character handling
- Bounds checking for string operations
Consider applying these improvements:
ACE_Vector<char> temp_narrow_env; +// Convert wide environment strings to narrow, handling multi-byte characters +// Note: Each wide character may convert to multiple bytes if (this->use_unicode_environment_) { existing_wide_env = ::GetEnvironmentStringsW (); + if (!existing_wide_env) + { + ACELIB_ERROR ((LM_ERROR, + ACE_TEXT ("Failed to get environment strings"))); + return; + } for (WCHAR *iter = existing_wide_env; *iter; ++iter) { ACE_Wide_To_Ascii wta (iter); + if (!wta.char_rep()) + { + ACELIB_ERROR ((LM_ERROR, + ACE_TEXT ("Failed to convert environment string"))); + ::FreeEnvironmentStringsW (existing_wide_env); + return; + } size_t const len = ACE_OS::strlen (wta.char_rep ()); size_t const idx = temp_narrow_env.size (); + try { temp_narrow_env.resize (idx + len + 1, 0); + } catch (const std::bad_alloc&) { + ACELIB_ERROR ((LM_ERROR, + ACE_TEXT ("Failed to allocate memory for environment"))); + ::FreeEnvironmentStringsW (existing_wide_env); + return; + } ACE_OS::strncpy (&temp_narrow_env[idx], wta.char_rep (), len); iter += ACE_OS::strlen(iter); }
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ACE/ace/Process.cpp(1 hunks)
🔇 Additional comments (2)
ACE/ace/Process.cpp (2)
935-935: Correct fix for environment variable handling with multi-byte characters.The change correctly advances the iterator using the source string length instead of the converted string length. This is essential for proper handling of multi-byte characters (e.g., Chinese) where the converted string length can be different from the source string length.
Please add a test case to verify this fix. The test should:
- Set up environment variables containing multi-byte characters
- Call
inherit_environment()- Verify that all environment variables are correctly inherited
Would you like me to help create a test case that reproduces the issue and verifies the fix?
913-969: Extend test coverage for environment inheritance.As requested by jwillemsen, please extend the unit tests to cover:
- Environment inheritance with multi-byte characters
- Error conditions (memory allocation, conversion failures)
- Mixed ASCII and multi-byte environment variables
Let's verify the existing test coverage:
Would you like me to help create comprehensive test cases that cover these scenarios?
While using ACE_Wide_To_Ascii string conversion class (and correspondingly ::WideCharToMultiByte) there must be expected that the length of the output multi-byte string is not equal to the length of the input Unicode string. That's why the variable iter used to iterate over the original Unicode environment variables must be increased by the source string length (and not by the length of the converted string).
Summary by CodeRabbit