linux-kernel - Re: [RFC] BPF fault/jitter-injection framework

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Message-ID: <giu7jtmw7ixfej4hkpmdjy6agplhokinyo7lzfd6pc3chi6zm3@7jjqpl4m5r2i>
Date: Tue, 6 May 2025 12:12:14 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Sergey Senozhatsky <senozhatsky@...omium.org>, 
	Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] BPF fault/jitter-injection framework

On (25/05/02 19:10), Alexei Starovoitov wrote:
> To call schedule_timeout() bpf program needs to be sleepable.
> Majority of LSM and ALLOW_ERROR_INJECTION hooks are sleepable.
> All syscalls are sleepable too.

Thank you for your reply, Alexei.

A question:
Are "ALLOW_ERROR_INJECTION hooks" some sort of BPF programs type?
I looked at libbpf but couldn't find any mention of ALLOW_ERROR_INJECTION.

Is there a way to make sure that "bpf_sleep()" can only be called from
those special programs (that would require CONFIG_FAULT_INJECTION)?