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Date: Wed, 11 May 2022 15:15:42 -0700 From: Jakub Kicinski <kuba@...nel.org> To: Kees Cook <keescook@...omium.org> Cc: "David S. Miller" <davem@...emloft.net>, Christoph Hellwig <hch@...radead.org>, Paolo Abeni <pabeni@...hat.com>, Kuniyuki Iwashima <kuniyu@...zon.co.jp>, Alexei Starovoitov <ast@...nel.org>, Cong Wang <cong.wang@...edance.com>, Al Viro <viro@...iv.linux.org.uk>, netdev@...r.kernel.org, linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] af_unix: Silence randstruct GCC plugin warning On Tue, 10 May 2022 17:01:09 -0700 Kees Cook wrote: > While preparing for Clang randstruct support (which duplicated many of > the warnings the randstruct GCC plugin warned about), one strange one > remained only for the randstruct GCC plugin. Eliminating this rids > the plugin of the last exception. > > It seems the plugin is happy to dereference individual members of > a cross-struct cast, but it is upset about casting to a whole object > pointer. This only manifests in one place in the kernel, so just replace > the variable with individual member accesses. There is no change in > executable instruction output. > > Drop the last exception from the randstruct GCC plugin. > > Cc: "David S. Miller" <davem@...emloft.net> > Cc: Jakub Kicinski <kuba@...nel.org> > Cc: Christoph Hellwig <hch@...radead.org> > Cc: Paolo Abeni <pabeni@...hat.com> > Cc: Kuniyuki Iwashima <kuniyu@...zon.co.jp> > Cc: Alexei Starovoitov <ast@...nel.org> > Cc: Cong Wang <cong.wang@...edance.com> > Cc: Al Viro <viro@...iv.linux.org.uk> > Cc: netdev@...r.kernel.org > Cc: linux-hardening@...r.kernel.org > Signed-off-by: Kees Cook <keescook@...omium.org> > --- > If someone can Ack this, I can carry it in the gcc-plugins tree, > as I'm trying to remove all its exceptions so I can drop that code. Acked-by: Jakub Kicinski <kuba@...nel.org>
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