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: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 15 Aug 2014 12:29:38 -0700
From:	Alexei Starovoitov <>
To:	Andy Lutomirski <>
Cc:	"David S. Miller" <>,
	Ingo Molnar <>,
	Linus Torvalds <>,
	Steven Rostedt <>,
	Daniel Borkmann <>,
	Chema Gonzalez <>,
	Eric Dumazet <>,
	Peter Zijlstra <>,
	"H. Peter Anvin" <>,
	Andrew Morton <>,
	Kees Cook <>,
	Linux API <>,
	Network Development <>,
	"" <>
Subject: Re: [PATCH RFC v4 net-next 17/26] tracing: allow eBPF programs to be
 attached to events

On Fri, Aug 15, 2014 at 12:20 PM, Andy Lutomirski <> wrote:
>>> I don't think that fixing this should be a prerequisite for merging,
>>> since the risk is so small.  Nonetheless, it would be nice.  (This
>>> family of attacks has lead to several root vulnerabilities in the
>>> past.)
>> Ok. I think keeping a track of pid between open and write is kinda
>> ugly.
> Agreed.
> TBH, I would just add a comment to the open implementation saying
> that, if unprivileged or less privileged open is allowed, then this
> needs to be fixed.

ok. will do.

>> Should we add some new CAP flag and check it for all file
>> ops? Another option is to conditionally make open() of tracing
>> files as cloexec...
> That won't help.  The same attack can be done with SCM_RIGHTS, and
> cloexec can be cleared.

ouch, can we then make ebpf FDs and may be debugfs FDs
not passable at all? Otherwise it feels that generality and
flexibility of FDs is becoming a burden.
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists