linux-kernel - Re: linux-next: build failure after merge of the origin tree

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Date:   Wed, 29 Jul 2020 20:17:48 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Emese Revfy <re.emese@...il.com>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Willy Tarreau <w@....eu>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: Re: linux-next: build failure after merge of the origin tree

On Wed, Jul 29, 2020 at 04:43:04PM -0700, Linus Torvalds wrote:
> On Wed, Jul 29, 2020 at 4:08 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> >
> > include/linux/random.h:123:24: error: variable 'net_rand_state' with 'latent_entropy' attribute must not be local
> >   123 | DECLARE_PER_CPU(struct rnd_state, net_rand_state) __latent_entropy;
> 
> Hmm.
> 
> Ok, this shows a limitation of my allmodconfig testing (and all my
> normal builds) - no plugins. So that problem wasn't as obvious as it
> should have been.

I'll look into this more tomorrow. (But yes, __latent_entropy is
absolutely used for globals already, as you found, but this is the first
percpu it was applied to...)

> Adding the gcc plugin people. Otherwise the only option seems to be to
> just remove that __latent_entropy marker.

And just another heads-up, the patch[1] (which was never sent to a public
list) also breaks arm64 (circular header needs?):

$ make CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64 defconfig
...
$ make -j$(getconf _NPROCESSORS_ONLN) CROSS_COMPILE=aarch64-linux-gnu- ARCH=arm64
...
In file included from ./arch/arm64/include/asm/smp.h:33,
                 from ./include/linux/smp.h:82,
                 from ./include/linux/percpu.h:7,
                 from ./include/linux/random.h:14,
                 from arch/arm64/kernel/pointer_auth.c:5:
./arch/arm64/include/asm/pointer_auth.h: In function ‘ptrauth_keys_init_user’:
./arch/arm64/include/asm/pointer_auth.h:40:3: error: implicit declaration of function ‘get_random_bytes’; did you mean ‘get_random_once’? [-Werror=implicit-function-declaration]
   40 |   get_random_bytes(&keys->apia, sizeof(keys->apia));
      |   ^~~~~


[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f227e3ec3b5cad859ad15666874405e8c1bbc1d4

-- 
Kees Cook