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Date: Tue, 25 Oct 2022 16:16:54 -0700 From: Kees Cook <keescook@...omium.org> To: linux-hardening@...r.kernel.org Cc: Kees Cook <keescook@...omium.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Nick Desaulniers <ndesaulniers@...gle.com>, linux-kernel@...r.kernel.org Subject: [PATCH] fortify: Do not cast to "unsigned char" Do not cast to "unsigned char", as this needlessly creates type problems when attempting builds without -Wno-pointer-sign[1]. The intent of the cast is to drop possible "const" types. [1] https://lore.kernel.org/lkml/CAHk-=wgz3Uba8w7kdXhsqR1qvfemYL+OFQdefJnkeqXG8qZ_pA@mail.gmail.com/ Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org> Fixes: 3009f891bb9f ("fortify: Allow strlen() and strnlen() to pass compile-time known lengths") Cc: Nick Desaulniers <ndesaulniers@...gle.com> Cc: linux-hardening@...r.kernel.org Signed-off-by: Kees Cook <keescook@...omium.org> --- include/linux/fortify-string.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/fortify-string.h b/include/linux/fortify-string.h index f3dd5d1a6a25..09a032f6ce6b 100644 --- a/include/linux/fortify-string.h +++ b/include/linux/fortify-string.h @@ -18,7 +18,7 @@ void __write_overflow_field(size_t avail, size_t wanted) __compiletime_warning(" #define __compiletime_strlen(p) \ ({ \ - unsigned char *__p = (unsigned char *)(p); \ + char *__p = (char *)(p); \ size_t __ret = SIZE_MAX; \ size_t __p_size = __member_size(p); \ if (__p_size != SIZE_MAX && \ -- 2.34.1
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