[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <55668CCD.9040506@huawei.com>
Date: Thu, 28 May 2015 11:34:37 +0800
From: "Wangnan (F)" <wangnan0@...wei.com>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
CC: <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>,
<lizefan@...wei.com>, <linux-kernel@...r.kernel.org>,
<pi3orama@....com>
Subject: Re: [RFC PATCH v4 09/29] bpf tools: Collect version and license from
ELF sections
On 2015/5/28 9:48, Alexei Starovoitov wrote:
> On Wed, May 27, 2015 at 05:19:44AM +0000, Wang Nan wrote:
>> Expand bpf_obj_elf_collect() to collect license and kernel version
>> information in eBPF object file. eBPF object file should have a section
>> named 'license', which contains a string. It should also have a section
>> named 'version', contains a u32 LINUX_VERSION_CODE.
>>
>> bpf_obj_validate() is introduced to validate object file after loaded.
>> Currently it only check existance of 'version' section.
>>
>> Signed-off-by: Wang Nan <wangnan0@...wei.com>
>> ---
> ...
>> +static int
>> +bpf_object__init_kversion(struct bpf_object *obj,
>> + void *data, size_t size)
>> +{
>> + u32 kver;
>> + if (size < sizeof(kver)) {
> shouldn't it be '!=' ?
Is it possible that LLVM pads 'version' section so the size of it becomes
longer than sizeof(u32)?
Thank you.
>> + pr_warning("invalid kver section in %s\n", obj->path);
>> + return -EINVAL;
>> + }
>> + memcpy(&kver, data, sizeof(kver));
>> + obj->kern_version = kver;
>> + pr_debug("kernel version of %s is %x\n", obj->path,
>> + obj->kern_version);
>> + return 0;
>> +}
>> +
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists