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:   Tue, 12 May 2020 10:34:58 +0200
From:   Toke Høiland-Jørgensen <>
To:     Alexei Starovoitov <>
Cc:     Daniel Borkmann <>,
        Andrii Nakryiko <>,
        "David S. Miller" <>,
        Andrey Ignatov <>,
        Networking <>, bpf <>
Subject: Re: bpf: ability to attach freplace to multiple parents

Alexei Starovoitov <> writes:

>> > Currently fentry/fexit/freplace progs have single prog->aux->linked_prog pointer.
>> > It just needs to become a linked list.
>> > The api extension could be like this:
>> > bpf_raw_tp_open(prog_fd, attach_prog_fd, attach_btf_id);
>> > (currently it's just bpf_raw_tp_open(prog_fd))
>> > The same pair of (attach_prog_fd, attach_btf_id) is already passed into prog_load
>> > to hold the linked_prog and its corresponding btf_id.
>> > I'm proposing to extend raw_tp_open with this pair as well to
>> > attach existing fentry/fexit/freplace prog to another target.
>> > Internally the kernel verify that btf of current linked_prog
>> > exactly matches to btf of another requested linked_prog and
>> > if they match it will attach the same prog to two target programs (in case of freplace)
>> > or two kernel functions (in case of fentry/fexit).
>> API-wise this was exactly what I had in mind as well.
> perfect!

Hi Alexei

I don't suppose you've had a chance to whip up a patch for this, have
you? :)


Powered by blists - more mailing lists