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

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Message-ID: <20240330082755.1cbeb8c6@rorschach.local.home>
Date: Sat, 30 Mar 2024 08:27:55 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: 梦龙董 <dongmenglong.8@...edance.com>, Alexei
 Starovoitov <alexei.starovoitov@...il.com>, Jiri Olsa <jolsa@...nel.org>,
 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 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.

-- Steve