linux-kernel - [PATCH v3 0/4] binfmt_elf: Support segments with 0 filesz and misaligned starts

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Message-Id: <20230927033634.make.602-kees@kernel.org>
Date:   Tue, 26 Sep 2023 20:42:17 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Eric Biederman <ebiederm@...ssion.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Sebastian Ott <sebott@...hat.com>,
        Thomas Weißschuh <linux@...ssschuh.net>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Pedro Falcato <pedro.falcato@...il.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-hardening@...r.kernel.org
Subject: [PATCH v3 0/4] binfmt_elf: Support segments with 0 filesz and misaligned starts

Hi,

This is the continuation of the work Eric started for handling
"p_memsz > p_filesz" in arbitrary segments (rather than just the last,
BSS, segment). I've added the suggested changes:

 - drop unused "elf_bss" variable
 - report padzero() errors when PROT_WRITE is present
 - refactor load_elf_interp() to use elf_load()

This passes my quick smoke tests, but I'm still trying to construct some
more complete tests...

-Kees

Eric W. Biederman (1):
  binfmt_elf: Support segments with 0 filesz and misaligned starts

Kees Cook (3):
  binfmt_elf: elf_bss no longer used by load_elf_binary()
  binfmt_elf: Provide prot bits as context for padzero() errors
  binfmt_elf: Use elf_load() for interpreter

 fs/binfmt_elf.c | 192 ++++++++++++++++++------------------------------
 1 file changed, 71 insertions(+), 121 deletions(-)

-- 
2.34.1