linux-kernel - Re: [PATCH v2 0/2] Fix binfmt

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Date:   Thu, 15 Apr 2021 00:32:10 +0000
From:   Damien Le Moal <Damien.LeMoal@....com>
To:     Palmer Dabbelt <palmer@...belt.com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Max Filippov <jcmvbkbc@...il.com>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Anup Patel <Anup.Patel@....com>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 0/2] Fix binfmt_flat loader for RISC-V

On 2021/04/08 0:49, Damien Le Moal wrote:
> RISC-V NOMMU flat binaries cannot tolerate a gap between the text and
> data section as the toolchain fully resolves at compile time the PC
> relative global pointer (__global_pointer$ value loaded in gp register).
> Without a relocation entry provided, the flat bin loader cannot fix the
> value if a gap is introduced and executables fail to run.
> 
> This series fixes this problem by allowing an architecture to request
> the flat loader to suppress the gap between the text and data sections.
> The first patch fixes binfmt_flat flat_load_file() using the new
> configuration option CONFIG_BINFMT_FLAT_NO_TEXT_DATA_GAP. The second
> patch enables this option for RISCV NOMMU builds.
> 
> These patches do not change the binfmt_flat loader behavior for other
> architectures.
> 
> Changes from v1:
> * Replace FLAT_TEXT_DATA_NO_GAP macro with
>   CONFIG_BINFMT_FLAT_NO_TEXT_DATA_GAP config option (patch 1).
> * Remove the addition of riscv/include/asm/flat.h and set
>   CONFIG_BINFMT_FLAT_NO_TEXT_DATA_GAP for RISCV and !MMU
> 
> Damien Le Moal (2):
>   binfmt_flat: allow not offsetting data start
>   riscv: Disable text-data gap in flat binaries
> 
>  arch/riscv/Kconfig |  1 +
>  fs/Kconfig.binfmt  |  3 +++
>  fs/binfmt_flat.c   | 21 +++++++++++++++------
>  3 files changed, 19 insertions(+), 6 deletions(-)
> 

Ping ?

Any comment on these patches ?

Without them, RISC-V NOMMU user space does not run... I would really like to get
these in this cycle if possible.


-- 
Damien Le Moal
Western Digital Research