netdev - Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support to record and check the accessed args

lists.openwall.net		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 linux-cve-announce 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]

Message-ID: <ZghRXtc8ZiTOKMR3@krava>
Date: Sat, 30 Mar 2024 18:52:30 +0100
From: Jiri Olsa <olsajiri@...il.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>,
	梦龙董 <dongmenglong.8@...edance.com>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Andrii Nakryiko <andrii@...nel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Martin KaFai Lau <martin.lau@...ux.dev>, Eddy Z <eddyz87@...il.com>,
	Song Liu <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>,
	Hao Luo <haoluo@...gle.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>, X86 ML <x86@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Quentin Monnet <quentin@...valent.com>, bpf <bpf@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-riscv <linux-riscv@...ts.infradead.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	linux-trace-kernel@...r.kernel.org,
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>,
	linux-stm32@...md-mailman.stormreply.com
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support
 to record and check the accessed args

On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> On Fri, 29 Mar 2024 16:28:33 -0700
> Andrii Nakryiko <andrii.nakryiko@...il.com> wrote:
> 
> > I thought I'll just ask instead of digging through code, sorry for
> > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > how hard is it to pass input function arguments to a kretprobe? That's
> > the biggest advantage of fexit over kretprobe, and if we can make
> > these original pt_regs/ftrace_regs available to kretprobe, then
> > multi-kretprobe will effectively be this multi-fexit.
> 
> This should be possible with the updates that Masami is doing with the
> fgraph code.

yes, I have bpf kprobe-multi link support for that [0] (it's on top of
Masami's fprobe-over-fgraph changes) we discussed that in [1]

jirka

[0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
[1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/