linux-kernel - Re: linux-next: /home/broonie/tmpfs/next/kernel/bpf/verifier.c:

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Message-ID: <59E8B0F1.40509@iogearbox.net>
Date:   Thu, 19 Oct 2017 16:04:33 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Mark Brown <broonie@...nel.org>,
        David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Edward Cree <ecree@...arflare.com>
CC:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: /home/broonie/tmpfs/next/kernel/bpf/verifier.c:

On 10/19/2017 03:55 PM, Mark Brown wrote:
> Hi all,
>
> After merging the net-next tree, today's linux-next build (x86allmodconfig)
> failed like this:
>
> /home/broonie/tmpfs/next/kernel/bpf/verifier.c: In function 'check_mem_access':
> /home/broonie/tmpfs/next/kernel/bpf/verifier.c:1010:12: error: passing argument 1 of 'verbose' from incompatible pointer type [-Werror=incompatible-pointer-types]
>      verbose("dereference of modified ctx ptr R%d off=%d+%d, ctx+const is allowed, ctx+const+const is not\n",
>              ^

Yeah, the verbose calls need to have env passed into them:

   verbose(env, [...])

See also the note below '---':

   http://patchwork.ozlabs.org/patch/826449/

> /home/broonie/tmpfs/next/kernel/bpf/verifier.c:173:28: note: expected 'struct bpf_verifier_env *' but argument is of type 'char *'
>   static __printf(2, 3) void verbose(struct bpf_verifier_env *env,
>                              ^
> /home/broonie/tmpfs/next/kernel/bpf/verifier.c:1011:5: warning: passing argument 2 of 'verbose' makes pointer from integer without a cast [-Wint-conversion]
>       regno, reg->off, off - reg->off);
>       ^
> /home/broonie/tmpfs/next/kernel/bpf/verifier.c:173:28: note: expected 'const char *' but argument is of type 'u32 {aka unsigned int}'
>   static __printf(2, 3) void verbose(struct bpf_verifier_env *env,
>                              ^
> cc1: some warnings being treated as errors
> /home/broonie/tmpfs/next/scripts/Makefile.build:313: recipe for target 'kernel/bpf/verifier.o' failed
>
> Caused by commit
>
>    28e33f9d78eef ("bpf: disallow arithmetic operations on context pointer")
>
> interacting with
>
>    61bd5218eef34 ("bpf: move global verifier log into verifier environment")
>