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

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Date:   Thu, 19 Oct 2017 14:55:23 +0100
From:   Mark Brown <broonie@...nel.org>
To:     David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        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: linux-next: /home/broonie/tmpfs/next/kernel/bpf/verifier.c:

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",
            ^
/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")

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