[PATCH V3 2/3] ARM: net: bpf_jit: make code generation less dependent on struct sk_filter.
Daniel Borkmann
dborkman at redhat.com
Fri Apr 26 15:47:46 EDT 2013
On 04/26/2013 09:26 PM, Andrew Morton wrote:
> On Fri, 26 Apr 2013 16:04:44 +0200 Arnd Bergmann <arnd at arndb.de> wrote:
>> On Wednesday 24 April 2013 19:27:08 Nicolas Schichan wrote:
>>> @@ -858,7 +858,7 @@ b_epilogue:
>>> }
>>>
>>>
>>> -void bpf_jit_compile(struct sk_filter *fp)
>>> +static void __bpf_jit_compile(struct jit_ctx *out_ctx)
>>> {
>>> struct jit_ctx ctx;
>>> unsigned tmp_idx;
>>> @@ -867,11 +867,10 @@ void bpf_jit_compile(struct sk_filter *fp)
>>> if (!bpf_jit_enable)
>>> return;
>>>
>>> - memset(&ctx, 0, sizeof(ctx));
>>> - ctx.skf = fp;
>>> + ctx = *out_ctx;
>>> ctx.ret0_fp_idx = -1;
>>>
>>> - ctx.offsets = kzalloc(4 * (ctx.skf->len + 1), GFP_KERNEL);
>>> + ctx.offsets = kzalloc(4 * (ctx.prog_len + 1), GFP_KERNEL);
>>> if (ctx.offsets == NULL)
>>> return;
>>>
>>> @@ -921,13 +920,26 @@ void bpf_jit_compile(struct sk_filter *fp)
>>> print_hex_dump(KERN_INFO, "BPF JIT code: ",
>>> DUMP_PREFIX_ADDRESS, 16, 4, ctx.target,
>>> alloc_size, false);
>>> -
>>> - fp->bpf_func = (void *)ctx.target;
>>> out:
>>> kfree(ctx.offsets);
>>> +
>>> + *out_ctx = ctx;
>>> return;
>>
>> This part of the patch, in combination with 79617801e "filter: bpf_jit_comp:
>> refactor and unify BPF JIT image dump output" is now causing build errors
>> in linux-next:
>>
>> arch/arm/net/bpf_jit_32.c: In function '__bpf_jit_compile':
>> arch/arm/net/bpf_jit_32.c:930:16: error: 'fp' undeclared (first use in this function)
>> bpf_jit_dump(fp->len, alloc_size, 2, ctx.target);
>
> Thanks, I did this. There may be a smarter way...
I think also seccomp_jit_compile() would need this change then, otherwise the build
with CONFIG_SECCOMP_FILTER_JIT might break.
I can fix this up for you if not already applied. I presume it's against
linux-next tree?
> --- a/arch/arm/net/bpf_jit_32.c~arm-net-bpf_jit-make-code-generation-less-dependent-on-struct-sk_filter-fix
> +++ a/arch/arm/net/bpf_jit_32.c
> @@ -858,7 +858,7 @@ b_epilogue:
> }
>
>
> -static void __bpf_jit_compile(struct jit_ctx *out_ctx)
> +static void __bpf_jit_compile(struct sk_filter *fp, struct jit_ctx *out_ctx)
> {
> struct jit_ctx ctx;
> unsigned tmp_idx;
> @@ -934,7 +934,7 @@ void bpf_jit_compile(struct sk_filter *f
> ctx.prog_len = fp->len;
> ctx.prog_insns = fp->insns;
>
> - __bpf_jit_compile(&ctx);
> + __bpf_jit_compile(fp, &ctx);
> if (ctx.target)
> fp->bpf_func = (void *)ctx.target;
> }
> _
>
> --
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