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

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

[Mark Brown]

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

[Daniel Borkmann]

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")
>