[PATCH v2 1/4] net: Split a __sys_bind helper for io_uring

[Matus Jokay]

On 19. 6. 2024 17:06, Jens Axboe wrote:
> On 6/19/24 9:04 AM, Jakub Kicinski wrote:
>> On Wed, 19 Jun 2024 07:40:40 -0600 Jens Axboe wrote:
>>> On 6/18/24 6:49 PM, Jakub Kicinski wrote:
>>>> On Fri, 14 Jun 2024 12:30:44 -0400 Gabriel Krisman Bertazi wrote:  
>>>>> io_uring holds a reference to the file and maintains a
>>>>> sockaddr_storage address.  Similarly to what was done to
>>>>> __sys_connect_file, split an internal helper for __sys_bind in
>>>>> preparation to supporting an io_uring bind command.
>>>>>
>>>>> Reviewed-by: Jens Axboe <axboe at kernel.dk>
>>>>> Signed-off-by: Gabriel Krisman Bertazi <krisman at suse.de>  
>>>>
>>>> Acked-by: Jakub Kicinski <kuba at kernel.org>  
>>>
>>> Are you fine with me queueing up 1-2 via the io_uring branch?
>>> I'm guessing the risk of conflict should be very low, so doesn't
>>> warrant a shared branch.
>>
>> Yup, exactly, these can go via io_uring without branch juggling.
> 
> Great thanks!
> 
Please fix io_bind and io_listen to not pass NULL ptr to related helpers
__sys_bind_socket and __sys_listen_socket. The first helper's argument
shouldn't be NULL, as related security hooks expect a valid socket object.

See the syzkaller's bug report:
https://lore.kernel.org/linux-security-module/0000000000007b7ce6061d1caec0@google.com/

Thanks,
mY