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Message-ID: <CACRpkdbHOa=59DnQzZRV0BrDx0yxm97JjaR0GaeG3jywW0bRBg@mail.gmail.com> Date: Sun, 24 Sep 2023 02:15:29 +0200 From: Linus Walleij <linus.walleij@...aro.org> To: Kees Cook <keescook@...omium.org> Cc: Bartosz Golaszewski <brgl@...ev.pl>, Andy Shevchenko <andy@...nel.org>, linux-gpio@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, linux-hardening@...r.kernel.org Subject: Re: [PATCH] gpiolib: cdev: Annotate struct linereq with __counted_by On Fri, Sep 22, 2023 at 7:52 PM Kees Cook <keescook@...omium.org> wrote: > Prepare for the coming implementation by GCC and Clang of the __counted_by > attribute. Flexible array members annotated with __counted_by can have > their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS > (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family > functions). > > As found with Coccinelle[1], add __counted_by for struct linereq. > Additionally, since the element count member must be set before accessing > the annotated flexible array member, move its initialization earlier. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Linus Walleij <linus.walleij@...aro.org> > Cc: Bartosz Golaszewski <brgl@...ev.pl> > Cc: Andy Shevchenko <andy@...nel.org> > Cc: linux-gpio@...r.kernel.org > Signed-off-by: Kees Cook <keescook@...omium.org> That's neat! Reviewed-by: Linus Walleij <linus.walleij@...aro.org> Yours, Linus Walleij
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