linux-kernel - Re: [PATCH bpf-next v5 1/6] arm64: ftrace: Add ftrace direct call support

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: <CACYkzJ4aetRT0SuF3Kh5MOMw3y_AQP8qNoDxFdz_0hypQ6H10w@mail.gmail.com>
Date:   Mon, 23 May 2022 03:39:57 +0200
From:   KP Singh <kpsingh@...nel.org>
To:     Xu Kuohai <xukuohai@...wei.com>
Cc:     bpf@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Zi Shen Lim <zlim.lnx@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        hpa@...or.com, Shuah Khan <shuah@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Daniel Kiss <daniel.kiss@....com>,
        Steven Price <steven.price@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Marc Zyngier <maz@...nel.org>,
        Peter Collingbourne <pcc@...gle.com>,
        Mark Brown <broonie@...nel.org>,
        Delyan Kratunov <delyank@...com>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>
Subject: Re: [PATCH bpf-next v5 1/6] arm64: ftrace: Add ftrace direct call support

On Wed, May 18, 2022 at 3:53 PM Xu Kuohai <xukuohai@...wei.com> wrote:
>
> Add ftrace direct support for arm64.
>
> 1. When there is custom trampoline only, replace the fentry nop to a
>    jump instruction that jumps directly to the custom trampoline.
>
> 2. When ftrace trampoline and custom trampoline coexist, jump from
>    fentry to ftrace trampoline first, then jump to custom trampoline
>    when ftrace trampoline exits. The current unused register
>    pt_regs->orig_x0 is used as an intermediary for jumping from ftrace
>    trampoline to custom trampoline.
>
> Signed-off-by: Xu Kuohai <xukuohai@...wei.com>
> Acked-by: Song Liu <songliubraving@...com>

Acked-by: KP Singh <kpsingh@...nel.org>