[PATCH RESEND]kexec:i386/kexec-[bzImage|elf-x86]:x86_64/kexec-bzImage64: Use "\0" as command line instead of empty command line

[Zhang Yanfei]

于 2013年04月17日 08:13, Simon Horman 写道:
> On Tue, Apr 16, 2013 at 10:09:18PM +0800, Zhang Yanfei wrote:
>> 于 2013年04月08日 17:29, Zhang Yanfei 写道:
>>> 于 2013年04月08日 17:23, Wang YanQing 写道:
>>>> This patch prevents the problems to happen below:
>>>> In setup_linux_bootloader_parameters_high
>>>> 120         cmdline_ptr = ((char *)real_mode) + cmdline_offset;
>>>> 121         memcpy(cmdline_ptr, cmdline, cmdline_len);
>>>> 122         cmdline_ptr[cmdline_len - 1] = '\0';
>>>>
>>>> if cmdline_len == 0, Line 122 will corrupt kernel16 buf just before the commandline.
>>>> And in do_bzImage_load, for example,
>>>> 369         cmdline_end = setup_base + kern16_size_needed + command_line_len - 1;
>>>> 370         elf_rel_set_symbol(&info->rhdr, "cmdline_end", &cmdline_end,
>>>> 371                            sizeof(unsigned long));
>>>> Line 369 will go wrong, too.
>>>>
>>>> Signed-off-by: Wang YanQing <udknight at gmail.com>
>>>> ---
>>>>  Hi Zhang Yanfei, could you give your signed-off-by to
>>>>  this patch?
>>>
>>> Yeah.
>>>
>>> Signed-off-by: Zhang Yanfei <zhangyanfei at cn.fujitsu.com>
>>>
>>> Hi Simon, could you please take a look at this to see if the change is reasonable?
>>> After all, if no commadline, we make the commandline_len to 1. I don't know if
>>> this behaviour could be accepted by you.
>>>
>>
>> Hi Simon
>>
>> What is your opinion about this patch?
> 
> It seems reasonable to me, I have applied it.
> 
> I have added your Signed-off-by. However, for reference: unless you are the
> maintainer or were involved in writing the patch I think an Acked-by or
> Tested-by would be more appropriate.
> 

I added some codes in the mail when we discussed this patch, so I
add my Signed-off-by.

Anyway, thanks for your reminding:-)

Thanks
Zhang