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Can you point me to a qsort that does call malloc? This is news to me as the API is designed to not require this. There is no standard way to overwrite mall
by uecker 1y ago
Can you point me to a qsort that does call malloc? This is news to me as the API is designed to not require this. There is no standard way to overwrite malloc/free (which would be a limitation when using other libraries that do not make the allocator configurable), but it is often supported (e.g. malloc_hook in GNU libc) or can be done using the linker.
- broken_broken_ 1y agoGlibc’s one does and it caused a security vulnerability: https://www.qualys.com/2024/01/30/qsort.txt https://www.qualys.com/2024/01/30/qsort.txt TBH it was also news to me, I discovered it randomly while browsing vulnerabilities… Printf also allocates, and a ton of other stdlib functions as well.
- uecker 1y agoI now remember that I saw this before. But somehow I do not feel like it is a language problem when a standard library implementation allocates a temporary buffer using malloc under the hood as performance optimization.