linux-kernel - Re: [RFC PATCH] tracing: Fix syscall tracepoint use-after-free

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: <d3ce751e-e694-4b1d-9503-7e46e28eecf4@efficios.com>
Date: Thu, 24 Oct 2024 14:18:08 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>,
 Steven Rostedt <rostedt@...dmis.org>,
 Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Jordan Rife <jrife@...gle.com>, Arnaldo Carvalho de Melo
 <acme@...nel.org>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>,
 Joel Fernandes <joel@...lfernandes.org>, LKML
 <linux-kernel@...r.kernel.org>, Mark Rutland <mark.rutland@....com>,
 Masami Hiramatsu <mhiramat@...nel.org>, Ingo Molnar <mingo@...hat.com>,
 Michael Jeanson <mjeanson@...icios.com>, Namhyung Kim <namhyung@...nel.org>,
 "Paul E. McKenney" <paulmck@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>,
 syzbot+b390c8062d8387b6272a@...kaller.appspotmail.com,
 Yonghong Song <yhs@...com>
Subject: Re: [RFC PATCH] tracing: Fix syscall tracepoint use-after-free

On 2024-10-24 13:12, Andrii Nakryiko wrote:
[...]

> And as Alexei asked, where are the applied
> patches adding faultable tracepoints?
> 

On linux-next next-20241024 :

0850e1bc88b1 tracing/bpf: Add might_fault check to syscall probes
cdb537ac4179 tracing/perf: Add might_fault check to syscall probes
a3204c740a59 tracing/ftrace: Add might_fault check to syscall probes
a363d27cdbc2 tracing: Allow system call tracepoints to handle page faults   <---- This is where bisection points as first offending commit.
4aadde89d81f tracing/bpf: disable preemption in syscall probe
65e7462a16ce tracing/perf: disable preemption in syscall probe
13d750c2c03e tracing/ftrace: disable preemption in syscall probe
0e6caab8db8b tracing: Declare system call tracepoints with TRACE_EVENT_SYSCALL

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com