linux-hardening - Re: [PATCH] selinux: Annotate struct sidtab_str_cache with __counted

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Date:   Fri, 18 Aug 2023 10:33:56 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Paul Moore <paul@...l-moore.com>
Cc:     Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Paris <eparis@...isplace.org>,
        Ondrej Mosnacek <omosnace@...hat.com>, selinux@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        "GONG, Ruiqi" <gongruiqi1@...wei.com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] selinux: Annotate struct sidtab_str_cache with
 __counted_by

On Fri, Aug 18, 2023 at 12:25:12PM -0400, Paul Moore wrote:
> On Thu, Aug 17, 2023 at 4:22 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 sidtab_str_cache.
> >
> > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> >
> > Cc: Paul Moore <paul@...l-moore.com>
> > Cc: Stephen Smalley <stephen.smalley.work@...il.com>
> > Cc: Eric Paris <eparis@...isplace.org>
> > Cc: Ondrej Mosnacek <omosnace@...hat.com>
> > Cc: selinux@...r.kernel.org
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > ---
> >  security/selinux/ss/sidtab.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> This also looks good to me, but similarly to the audit patch, since we
> are at -rc6 I'm going to wait to merge this until after the merge
> window.  I'll send a follow up email once it's merged.

Thanks! Yeah, there's no rush. :)

-- 
Kees Cook