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Wed, 25 Aug 2021 14:59:36 -0700 (PDT) MIME-Version: 1.0 References: <20210822075122.864511-1-keescook@chromium.org> <20210822075122.864511-16-keescook@chromium.org> In-Reply-To: <20210822075122.864511-16-keescook@chromium.org> From: Nick Desaulniers Date: Wed, 25 Aug 2021 14:59:24 -0700 Message-ID: Subject: Re: [PATCH for-next 15/25] fortify: Move remaining fortify helpers into fortify-string.h To: Kees Cook Cc: linux-kernel@vger.kernel.org, Francis Laniel , Rasmus Villemoes , Daniel Micay , Bart Van Assche , David Gow , linux-mm@kvack.org, clang-built-linux@googlegroups.com, linux-hardening@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=google.com header.s=20161025 header.b=Rwvd09BG; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf01.hostedemail.com: domain of ndesaulniers@google.com designates 209.85.167.53 as permitted sender) smtp.mailfrom=ndesaulniers@google.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 06E6A502AC5E X-Stat-Signature: ucbhfonixi8ekwhwq9mr5ez4ps3tep3b X-HE-Tag: 1629928777-568922 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, Aug 22, 2021 at 12:57 AM Kees Cook wrote: > > When commit a28a6e860c6c ("string.h: move fortified functions definitions > in a dedicated header.") moved the fortify-specific code, some helpers > were left behind. Move the remaining fortify-specific helpers into > fortify-string.h so they're together where they're used. This requires > that any FORTIFY helper function prototypes be conditionally built to > avoid "no prototype" warnings. Additionally removes unused helpers. > > Acked-by: Francis Laniel > Signed-off-by: Kees Cook Reviewed-by: Nick Desaulniers > --- > include/linux/fortify-string.h | 7 +++++++ > include/linux/string.h | 9 --------- > lib/string_helpers.c | 2 ++ > 3 files changed, 9 insertions(+), 9 deletions(-) > > diff --git a/include/linux/fortify-string.h b/include/linux/fortify-string.h > index c1be37437e77..7e67d02764db 100644 > --- a/include/linux/fortify-string.h > +++ b/include/linux/fortify-string.h > @@ -2,6 +2,13 @@ > #ifndef _LINUX_FORTIFY_STRING_H_ > #define _LINUX_FORTIFY_STRING_H_ > > +#define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline)) > +#define __RENAME(x) __asm__(#x) > + > +void fortify_panic(const char *name) __noreturn __cold; > +void __read_overflow(void) __compiletime_error("detected read beyond size of object (1st parameter)"); > +void __read_overflow2(void) __compiletime_error("detected read beyond size of object (2nd parameter)"); > +void __write_overflow(void) __compiletime_error("detected write beyond size of object (1st parameter)"); > > #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) > extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr); > diff --git a/include/linux/string.h b/include/linux/string.h > index b48d2d28e0b1..9473f81b9db2 100644 > --- a/include/linux/string.h > +++ b/include/linux/string.h > @@ -249,15 +249,6 @@ static inline const char *kbasename(const char *path) > return tail ? tail + 1 : path; > } > > -#define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline)) > -#define __RENAME(x) __asm__(#x) > - > -void fortify_panic(const char *name) __noreturn __cold; > -void __read_overflow(void) __compiletime_error("detected read beyond size of object passed as 1st parameter"); > -void __read_overflow2(void) __compiletime_error("detected read beyond size of object passed as 2nd parameter"); > -void __read_overflow3(void) __compiletime_error("detected read beyond size of object passed as 3rd parameter"); > -void __write_overflow(void) __compiletime_error("detected write beyond size of object passed as 1st parameter"); > - > #if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE) > #include > #endif > diff --git a/lib/string_helpers.c b/lib/string_helpers.c > index e9433caab217..1274f45ffaf4 100644 > --- a/lib/string_helpers.c > +++ b/lib/string_helpers.c > @@ -879,9 +879,11 @@ char *strreplace(char *s, char old, char new) > } > EXPORT_SYMBOL(strreplace); > > +#ifdef CONFIG_FORTIFY_SOURCE > void fortify_panic(const char *name) > { > pr_emerg("detected buffer overflow in %s\n", name); > BUG(); > } > EXPORT_SYMBOL(fortify_panic); > +#endif /* CONFIG_FORTIFY_SOURCE */ > -- > 2.30.2 > > -- > You received this message because you are subscribed to the Google Groups "Clang Built Linux" group. > To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20210822075122.864511-16-keescook%40chromium.org. -- Thanks, ~Nick Desaulniers