Kees Cook <keescook@xxxxxxxxxxxx> writes: > The -fstrict-flex-arrays=3 option is now available with the release > of GCC 13[1] and Clang 16[2]. This feature instructs the compiler to > treat only C99 flexible arrays as dynamically sized for the purposes of > object size calculations. In other words, the ancient practice of using > 1-element arrays, or the GNU extension of using 0-sized arrays, as a > dynamically sized array is disabled. This allows CONFIG_UBSAN_BOUNDS, > CONFIG_FORTIFY_SOURCE, and other object-size aware features to behave > unambiguously in the face of trailing arrays: only C99 flexible arrays > are considered to be dynamically sized. > > Enabling this will help track down any outstanding cases of fake > flexible arrays that need attention in kernel code. > > [1] https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-fstrict-flex-arrays > [2] https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fstrict-flex-arrays > Maybe link to https://people.kernel.org/kees/bounded-flexible-arrays-in-c as well just in case some confused soul ends up bisecting to this but doesn't get the problem? Not really required though, just a thought I had.
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