Re: [Qemu-devel] [PATCH 2/3] hw/9pfs/virtio-9p-local.c: use snprintf() instead of sprintf()

[Chen Gang <gang.chen.5i5j@gmail.com>]

On 03/03/2014 10:42 PM, Markus Armbruster wrote:
> Chen Gang <gang.chen.5i5j@gmail.com> writes:
> 
>> On 03/03/2014 04:34 PM, Markus Armbruster wrote:
>>> Turns a buffer overrun bug into a truncation bug.  The next commit fixes
>>> truncation bugs including this one.  Would be nice to spell this out in
>>> the commit message.  Perhaps Aneesh can do it on commit.
>>>
[...]
>>
>> Please help doing it on commit.
> 
[...]
> If you respin your series anyway, simply improve your commit message.
> Something like this would do:
> 
>     hw/9pfs: Fix buffer overrun in local_remove(), local_unlinkat()
> 
>     When 'ctx->fs_root' + 'path'/'fullname.data' is larger than
>     PATH_MAX, we overrunning a buffer, smashing the stack.
> 
>     Fix by switching from sprintf() to snprintf().  Turns the buffer
>     overrun bugs into truncation bugs.  The next commit will fix them
>     along with similar truncation bugs elsewhere in 9pfs.
> 

OK, thank you for your details information.

And I guess, at present, I need not send patch v2 for this series
(Aneesh has helped done for them).


Thanks.
-- 
Chen Gang

Open, share, and attitude like air, water, and life which God blessed