hardening: Clarify Kconfig text for auto-var-init
Clarify the details around the automatic variable initialization modes available. Specifically this details the values used for pattern init and expands on the rationale for zero init safety. Additionally makes zero init the default when available. Cc: glider@google.com Cc: Nathan Chancellor <nathan@kernel.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: linux-security-module@vger.kernel.org Cc: clang-built-linux@googlegroups.com Signed-off-by: NKees Cook <keescook@chromium.org> Acked-by: NGustavo A. R. Silva <gustavoars@kernel.org>
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