linux-kernel - Re: [PATCH x86/urgent] bpf: emulate push insns for uprobe on x86

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]

Date:   Thu, 09 Nov 2017 09:06:47 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     yhs@...com
Cc:     mingo@...nel.org, tglx@...utronix.de, oleg@...hat.com,
        peterz@...radead.org, linux-kernel@...r.kernel.org, x86@...nel.org,
        netdev@...r.kernel.org, ast@...com, kernel-team@...com
Subject: Re: [PATCH x86/urgent] bpf: emulate push insns for uprobe on x86

From: Yonghong Song <yhs@...com>
Date: Wed, 8 Nov 2017 13:37:12 -0800

> Uprobe is a tracing mechanism for userspace programs.
> Typical uprobe will incur overhead of two traps.
> First trap is caused by replaced trap insn, and
> the second trap is to execute the original displaced
> insn in user space.
 ...

I don't understand how this is bpf related, and if it is you don't
explain it well in the commit message.

Thank you.