linux-kernel - [GIT PULL] Fix fill_files

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Date:   Tue, 08 Mar 2022 13:35:03 -0600
From:   "Eric W. Biederman" <ebiederm@...ssion.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Matthew Wilcox <willy@...radead.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Denys Vlasenko <vda.linux@...glemail.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Liam R . Howlett" <liam.howlett@...cle.com>,
        Jann Horn <jannh@...gle.com>, <linux-mm@...ck.org>
Subject: [GIT PULL] Fix fill_files_note

Kees,

Please pull the coredump-vma-snapshot-fix branch from the git tree:

  git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git coredump-vma-snapshot-fix

  HEAD: 390031c942116d4733310f0684beb8db19885fe6 coredump: Use the vma snapshot in fill_files_note

Matthew Wilcox has reported that a missing mmap_lock in file_files_note,
which could cause trouble.

Refactor the code and clean it up so that the vma snapshot makes
it to fill_files_note, and then use the vma snapshot in fill_files_note.

Eric W. Biederman (5):
      coredump: Move definition of struct coredump_params into coredump.h
      coredump: Snapshot the vmas in do_coredump
      coredump: Remove the WARN_ON in dump_vma_snapshot
      coredump/elf: Pass coredump_params into fill_note_info
      coredump: Use the vma snapshot in fill_files_note

 fs/binfmt_elf.c          | 66 ++++++++++++++++++++++--------------------------
 fs/binfmt_elf_fdpic.c    | 18 +++++--------
 fs/binfmt_flat.c         |  1 +
 fs/coredump.c            | 59 ++++++++++++++++++++++++++++---------------
 include/linux/binfmts.h  | 13 +---------
 include/linux/coredump.h | 20 ++++++++++++---
 6 files changed, 93 insertions(+), 84 deletions(-)

---

Kees I realized I needed to rebase this on Jann Horn's commit
84158b7f6a06 ("coredump: Also dump first pages of non-executable ELF
libraries").  Unfortunately before I got that done I got distracted and
these changes have been sitting in limbo for most of the development
cycle.  Since you are running a tree that is including changes like this
including Jann's can you please pull these changes into your tree.

Thank you,
Eric