Re: [RFC PATCH v2] compat: poll() in 32-bit applications does not handle negative timeout values properly on 64-bit kernels

[Josh Hunt <johunt@akamai.com>]

On 02/11/2012 09:47 AM, Eric Dumazet wrote:
> Le vendredi 10 février 2012 à 23:54 -0600, Josh Hunt a écrit :
>> We have hit an issue where our 32-bit applications using poll() and
>> passing in a value of -1 for the timeout value return after ~49 days
>> (2^32 msec), instead of waiting indefinitely. I've instrumented the
>> kernel and found we are hitting the case where poll() believes we've
>> passed in a positive number and thus creates a timespec, etc. I've
>> implemented compat_sys_poll() to sign-extend the timeout value and
>> resolve the issue.
>>
>> There was an almost identical patch submitted last year, but for
>> whatever reason did not make it in:
>> https://lkml.org/lkml/2011/9/18/19
> 
> Probably because Thomas Meyer didnt answer to patch reviewers, and not
> enough people cared.
> 
> By the way, an inline patch is better, as stated in
> Documentation/SubmittingPatches
> 
> Anyway, its time to fix this bug...
> 
> Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
> 

I can resubmit the patch inline if you feel that will get more attention
by whoever needs to do the final approval on this.

Josh