linux-kernel - Re: [PATCH v1 0/3] perf/binfmt/mm: remove in-tree usage of MAP

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Date:   Wed, 21 Apr 2021 14:03:49 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Mike Rapoport <rppt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Kevin Brodsky <Kevin.Brodsky@....com>,
        Michal Hocko <mhocko@...e.com>,
        Feng Tang <feng.tang@...el.com>,
        Don Zickus <dzickus@...hat.com>, x86@...nel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v1 0/3] perf/binfmt/mm: remove in-tree usage of MAP_EXECUTABLE

David Hildenbrand <david@...hat.com> writes:

> Stumbling over the history of MAP_EXECUTABLE, I noticed that we still
> have some in-tree users that we can get rid of.
>
> A good fit for the whole series could be Andrew's tree.

In general this looks like a good cleanup.

Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>

As far as I can see we can go after MAP_DENYWRITE the same way.
Today deny_write_access in open_exec is what causes -ETXTBSY
when attempting to write to file that is current executing.

Do you have any plans to look at that?

Eric

> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Alexander Viro <viro@...iv.linux.org.uk>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
> Cc: Greg Ungerer <gerg@...ux-m68k.org>
> Cc: Mike Rapoport <rppt@...nel.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Kevin Brodsky <Kevin.Brodsky@....com>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Feng Tang <feng.tang@...el.com>
> Cc: Don Zickus <dzickus@...hat.com>
> Cc: x86@...nel.org
> Cc: linux-fsdevel@...r.kernel.org
> Cc: linux-mm@...ck.org
>
> David Hildenbrand (3):
>   perf: MAP_EXECUTABLE does not indicate VM_MAYEXEC
>   binfmt: remove in-tree usage of MAP_EXECUTABLE
>   mm: ignore MAP_EXECUTABLE in ksys_mmap_pgoff()
>
>  arch/x86/ia32/ia32_aout.c |  4 ++--
>  fs/binfmt_aout.c          |  4 ++--
>  fs/binfmt_elf.c           |  2 +-
>  fs/binfmt_elf_fdpic.c     | 11 ++---------
>  fs/binfmt_flat.c          |  2 +-
>  include/linux/mman.h      |  2 ++
>  kernel/events/core.c      |  2 --
>  mm/mmap.c                 |  2 +-
>  mm/nommu.c                |  2 +-
>  9 files changed, 12 insertions(+), 19 deletions(-)