linux-kernel - [PATCH v2 0/2] procfs: Add file path and size to /proc/<pid>/fdinfo

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Date:   Thu, 23 Jun 2022 15:06:05 -0700
From:   Kalesh Singh <kaleshsingh@...gle.com>
To:     ckoenig.leichtzumerken@...il.com, christian.koenig@....com,
        viro@...iv.linux.org.uk, hch@...radead.org,
        stephen.s.brennan@...cle.com, David.Laight@...LAB.COM
Cc:     ilkos@...gle.com, tjmercier@...gle.com, surenb@...gle.com,
        kernel-team@...roid.com, Kalesh Singh <kaleshsingh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Anton Mitterer <mail@...istoph.anton.mitterer.name>,
        Johannes Weiner <hannes@...xchg.org>,
        Mike Rapoport <rppt@...nel.org>,
        Colin Cross <ccross@...gle.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org
Subject: [PATCH v2 0/2] procfs: Add file path and size to /proc/<pid>/fdinfo

Hi all,

This is v2 of the fdinfo patches. The main update is adding path
field only for files with anon inodes. Rebased on 5.19-rc3.

The previous cover letter is copied below for convenience.

Thanks,
Kalesh

-----------

Processes can pin shared memory by keeping a handle to it through a
file descriptor; for instance dmabufs, memfd, and ashmem (in Android).

In the case of a memory leak, to identify the process pinning the
memory, userspace needs to:
  - Iterate the /proc/<pid>/fd/* for each process
  - Do a readlink on each entry to identify the type of memory from
    the file path.
  - stat() each entry to get the size of the memory.

The file permissions on /proc/<pid>/fd/* only allows for the owner
or root to perform the operations above; and so is not suitable for
capturing the system-wide state in a production environment.

This issue was addressed for dmabufs by making /proc/*/fdinfo/*
accessible to a process with PTRACE_MODE_READ_FSCREDS credentials[1]
To allow the same kind of tracking for other types of shared memory,
add the following fields to /proc/<pid>/fdinfo/<fd>:

path - This allows identifying the type of memory based on common
       prefixes: e.g. "/memfd...", "/dmabuf...", "/dev/ashmem..."

       This was not an issued when dmabuf tracking was introduced
       because the exp_name field of dmabuf fdinfo could be used
       to distinguish dmabuf fds from other types.

size - To track the amount of memory that is being pinned.

       dmabufs expose size as an additional field in fdinfo. Remove
       this and make it a common field for all fds.

Access to /proc/<pid>/fdinfo is governed by PTRACE_MODE_READ_FSCREDS
-- the same as for /proc/<pid>/maps which also exposes the path and
size for mapped memory regions.

This allows for a system process with PTRACE_MODE_READ_FSCREDS to
account the pinned per-process memory via fdinfo.


Kalesh Singh (2):
  procfs: Add 'size' to /proc/<pid>/fdinfo/
  procfs: Add 'path' to /proc/<pid>/fdinfo/

 Documentation/filesystems/proc.rst | 22 ++++++++++++++++++++--
 drivers/dma-buf/dma-buf.c          |  1 -
 fs/libfs.c                         |  9 +++++++++
 fs/proc/fd.c                       | 18 ++++++++++++++----
 include/linux/fs.h                 |  1 +
 5 files changed, 44 insertions(+), 7 deletions(-)


base-commit: a111daf0c53ae91e71fd2bfe7497862d14132e3e
-- 
2.37.0.rc0.161.g10f37bed90-goog