lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Fri, 4 Sep 2020 22:14:19 -0700
From:   Jakub Kicinski <>
To:     Cong Wang <>
        Jamal Hadi Salim <>,
        Vlad Buslov <>,
        Jiri Pirko <>
Subject: Re: [Patch net] act_ife: load meta modules before

On Thu,  3 Sep 2020 19:10:11 -0700 Cong Wang wrote:
> The following deadlock scenario is triggered by syzbot:
> Thread A:				Thread B:
> tcf_idr_check_alloc()
> ...
> populate_metalist()
>   rtnl_unlock()
> 					rtnl_lock()
> 					...
>   request_module()			tcf_idr_check_alloc()
>   rtnl_lock()
> At this point, thread A is waiting for thread B to release RTNL
> lock, while thread B is waiting for thread A to commit the IDR
> change with tcf_idr_insert() later.
> Break this deadlock situation by preloading ife modules earlier,
> before tcf_idr_check_alloc(), this is fine because we only need
> to load modules we need potentially.
> Reported-and-tested-by:
> Fixes: 0190c1d452a9 ("net: sched: atomically check-allocate action")
> Cc: Jamal Hadi Salim <>
> Cc: Vlad Buslov <>

Vlad, it'd have been nice to see your review tag here.

> Cc: Jiri Pirko <>
> Signed-off-by: Cong Wang <>

LGTM, applied and queued for stable, thank you Cong!

Powered by blists - more mailing lists