linux-kernel - Re: [RFC PATCH v3 09/37] bpf tools: Open eBPF object file and do basic validation

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Date:	Mon, 18 May 2015 11:06:01 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Wang Nan <wangnan0@...wei.com>, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, mingo@...hat.com, acme@...nel.org,
	namhyung@...nel.org, jolsa@...nel.org, dsahern@...il.com,
	daniel@...earbox.net, brendan.d.gregg@...il.com,
	masami.hiramatsu.pt@...achi.com
CC:	lizefan@...wei.com, linux-kernel@...r.kernel.org, pi3orama@....com
Subject: Re: [RFC PATCH v3 09/37] bpf tools: Open eBPF object file and do
 basic validation

On 5/17/15 3:56 AM, Wang Nan wrote:
> This patch adds basic 'struct bpf_object' which will be used for eBPF
> object file loading. eBPF object files are compiled by LLVM as ELF
> format. In this patch, libelf is used to open those files, read EHDR
> and do basic validation according to e_type and e_machine.
>
> All elf related staffs are grouped together and reside in elf field of
> 'struct bpf_object'. bpf_obj_clear_elf() is introduced to clear it.
>
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> ---
...
> +static void bpf_obj_clear_elf(struct bpf_object *obj)
> +{
> +	if (!obj_elf_valid(obj))
> +		return;
> +
> +	if (obj->elf.elf) {
> +		elf_end(obj->elf.elf);
> +		obj->elf.elf = NULL;

the name of the function is odd.
'..clear_elf' ? Only because the field was named 'elf' ?
Also obj->elf.elf looks unbalanced.

may be bpf_obj_elf_finish() to match bpf_obj_elf_init()
and obj->efile.elf ?

> +	}
> +	if (obj->elf.fd >= 0) {
> +		close(obj->elf.fd);

and the above will change to obj->efile.fd ?

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