Re: [PATCH v2 1/7] binfmt: don't use MAP_DENYWRITE when loading shared libraries via uselib()

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To: Guenter Roeck <linux@xxxxxxxxxxxx>
Subject: Re: [PATCH v2 1/7] binfmt: don't use MAP_DENYWRITE when loading shared libraries via uselib()
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Sun, 5 Sep 2021 10:17:26 -0700
Cc: David Hildenbrand <david@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Alexey Dobriyan <adobriyan@xxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>, Mark Rutland <mark.rutland@xxxxxxx>, Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, Namhyung Kim <namhyung@xxxxxxxxxx>, Petr Mladek <pmladek@xxxxxxxx>, Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>, Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>, Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>, Greg Ungerer <gerg@xxxxxxxxxxxxxx>, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Vincenzo Frascino <vincenzo.frascino@xxxxxxx>, Chinwen Chang <chinwen.chang@xxxxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>, Huang Ying <ying.huang@xxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Feng Tang <feng.tang@xxxxxxxxx>, Kevin Brodsky <Kevin.Brodsky@xxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Shawn Anastasio <shawn@xxxxxxxxxx>, Steven Price <steven.price@xxxxxxx>, Nicholas Piggin <npiggin@xxxxxxxxx>, Christian Brauner <christian.brauner@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Gabriel Krisman Bertazi <krisman@xxxxxxxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>, Shakeel Butt <shakeelb@xxxxxxxxxx>, Marco Elver <elver@xxxxxxxxxx>, Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>, Nicolas Viennot <Nicolas.Viennot@xxxxxxxxxxxx>, Thomas Cedeno <thomascedeno@xxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Miklos Szeredi <miklos@xxxxxxxxxx>, Chengguang Xu <cgxu519@xxxxxxxxxxxx>, Christian König <ckoenig.leichtzumerken@xxxxxxxxx>, Florian Weimer <fweimer@xxxxxxxxxx>, David Laight <David.Laight@xxxxxxxxxx>, linux-unionfs@xxxxxxxxxxxxxxx, Linux API <linux-api@xxxxxxxxxxxxxxx>, "the arch/x86 maintainers" <x86@xxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>
In-reply-to: <20210905153229.GA3019909@roeck-us.net>

On Sun, Sep 5, 2021 at 8:32 AM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
>
> Guess someone didn't care compile testing their code. This is now in
> mainline.

To be fair, a.out is disabled pretty much on all relevant platforms these days.

Only alpha and m68k left, I think.

I applied the obvious patch from Geert.

            Linus

Follow-Ups:
- Re: [PATCH v2 1/7] binfmt: don't use MAP_DENYWRITE when loading shared libraries via uselib()
  - From: David Hildenbrand

References:
- [PATCH v2 0/7] Remove in-tree usage of MAP_DENYWRITE
  - From: David Hildenbrand
- [PATCH v2 1/7] binfmt: don't use MAP_DENYWRITE when loading shared libraries via uselib()
  - From: David Hildenbrand
- Re: [PATCH v2 1/7] binfmt: don't use MAP_DENYWRITE when loading shared libraries via uselib()
  - From: Guenter Roeck

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