linux-kernel - Re: Chromium sandbox on LoongArch and statx -- seccomp deep argument inspection again?

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Message-ID: <f1a1bc708be543eb647df57b5eb0c0ef035baf8b.camel@xry111.site>
Date: Wed, 21 Feb 2024 14:31:02 +0800
From: Xi Ruoyao <xry111@...111.site>
To: WANG Xuerui <kernel@...0n.name>, linux-api@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>, Christian Brauner <brauner@...nel.org>, 
 Kees Cook <keescook@...omium.org>, Huacai Chen <chenhuacai@...nel.org>,
 Xuefeng Li <lixuefeng@...ngson.cn>, Jianmin Lv <lvjianmin@...ngson.cn>,
 Xiaotian Wu <wuxiaotian@...ngson.cn>, WANG Rui <wangrui@...ngson.cn>, Miao
 Wang <shankerwangmiao@...il.com>, Icenowy Zheng <uwu@...nowy.me>, 
 "loongarch@...ts.linux.dev" <loongarch@...ts.linux.dev>, linux-arch
 <linux-arch@...r.kernel.org>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>
Subject: Re: Chromium sandbox on LoongArch and statx -- seccomp deep
 argument inspection again?

On Wed, 2024-02-21 at 14:09 +0800, WANG Xuerui wrote:

> - just restore fstat and be done with it;
> - add a flag to statx so we can do the equivalent of just fstat(fd, 
> &out) with statx, and ensuring an error happens if path is not empty in 
> that case;

It's worse than "just restore fstat" considering the performance.  Read
this thread:
https://sourceware.org/pipermail/libc-alpha/2023-September/151320.html

> - tackle the long-standing problem of seccomp deep argument inspection (!).

Frankly I'm never a fan of syscall blocklisting.  When I develop the
Online Judge system for the programming contest training in Xidian
University I deliberately avoid using seccomp.  This thing is very
likely to break innocent programs with some system change innocent as
well (for example Glibc or libstdc++ update).

-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University