From: Al Viro <viro@zeniv.linux.org.uk>
To: Kees Cook <keescook@chromium.org>
Cc: Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
linux-fsdevel@vger.kernel.org,
Zack Rusin <zack.rusin@broadcom.com>,
Broadcom internal kernel review list
<bcm-kernel-feedback-list@broadcom.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
Jani Nikula <jani.nikula@linux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@intel.com>,
Tvrtko Ursulin <tursulin@ursulin.net>,
Andi Shyti <andi.shyti@linux.intel.com>,
Lucas De Marchi <lucas.demarchi@intel.com>,
Matt Atwood <matthew.s.atwood@intel.com>,
Matthew Auld <matthew.auld@intel.com>,
Nirmoy Das <nirmoy.das@intel.com>,
Jonathan Cavitt <jonathan.cavitt@intel.com>,
Will Deacon <will@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Boqun Feng <boqun.feng@gmail.com>,
Mark Rutland <mark.rutland@arm.com>,
Kent Overstreet <kent.overstreet@linux.dev>,
Masahiro Yamada <masahiroy@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Nicolas Schier <nicolas@fjasle.eu>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org, linux-kbuild@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH 5/5] fs: Convert struct file::f_count to refcount_long_t
Date: Thu, 2 May 2024 23:42:50 +0100 [thread overview]
Message-ID: <20240502224250.GM2118490@ZenIV> (raw)
In-Reply-To: <20240502223341.1835070-5-keescook@chromium.org>
On Thu, May 02, 2024 at 03:33:40PM -0700, Kees Cook wrote:
> Underflow of f_count needs to be more carefully detected than it
> currently is. The results of get_file() should be checked, but the
> first step is detection. Redefine f_count from atomic_long_t to
> refcount_long_t.
It is used on fairly hot paths. What's more, it's not
at all obvious what the hell would right semantics be.
NAKed-by: Al Viro <viro@zeniv.linux.org.uk>
next prev parent reply other threads:[~2024-05-02 23:05 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-02 22:33 [PATCH 0/5] fs: Do not allow get_file() to resurrect 0 f_count Kees Cook
2024-05-02 22:33 ` [PATCH 1/5] " Kees Cook
2024-05-02 22:53 ` Jann Horn
2024-05-02 23:03 ` Kees Cook
2024-05-03 9:02 ` Christian Brauner
2024-05-06 10:41 ` Hillf Danton
2024-05-02 22:33 ` [PATCH 2/5] drm/vmwgfx: Do not directly manipulate file->f_count Kees Cook
2024-05-02 22:33 ` [PATCH 3/5] drm/i915: " Kees Cook
2024-05-02 22:33 ` [PATCH 4/5] refcount: Introduce refcount_long_t and APIs Kees Cook
2024-05-06 8:04 ` kernel test robot
2024-05-02 22:33 ` [PATCH 5/5] fs: Convert struct file::f_count to refcount_long_t Kees Cook
2024-05-02 22:42 ` Al Viro [this message]
2024-05-02 22:52 ` Kees Cook
2024-05-02 23:12 ` Al Viro
2024-05-02 23:21 ` Kees Cook
2024-05-02 23:41 ` Al Viro
2024-05-03 0:10 ` Kees Cook
2024-05-03 0:14 ` Al Viro
2024-05-03 0:41 ` Kees Cook
2024-05-03 9:37 ` Christian Brauner
2024-05-03 10:36 ` Peter Zijlstra
2024-05-03 11:35 ` Christian Brauner
2024-05-02 23:08 ` ✗ Fi.CI.CHECKPATCH: warning for fs: Do not allow get_file() to resurrect 0 f_count Patchwork
2024-05-02 23:08 ` ✗ Fi.CI.SPARSE: " Patchwork
2024-05-02 23:15 ` ✓ Fi.CI.BAT: success " Patchwork
2024-05-03 2:28 ` ✓ Fi.CI.IGT: " Patchwork
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240502224250.GM2118490@ZenIV \
--to=viro@zeniv.linux.org.uk \
--cc=airlied@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=andi.shyti@linux.intel.com \
--cc=bcm-kernel-feedback-list@broadcom.com \
--cc=boqun.feng@gmail.com \
--cc=brauner@kernel.org \
--cc=daniel@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=intel-gfx@lists.freedesktop.org \
--cc=jack@suse.cz \
--cc=jani.nikula@linux.intel.com \
--cc=jonathan.cavitt@intel.com \
--cc=joonas.lahtinen@linux.intel.com \
--cc=keescook@chromium.org \
--cc=kent.overstreet@linux.dev \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-hardening@vger.kernel.org \
--cc=linux-kbuild@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=lucas.demarchi@intel.com \
--cc=maarten.lankhorst@linux.intel.com \
--cc=mark.rutland@arm.com \
--cc=masahiroy@kernel.org \
--cc=matthew.auld@intel.com \
--cc=matthew.s.atwood@intel.com \
--cc=mripard@kernel.org \
--cc=nathan@kernel.org \
--cc=nicolas@fjasle.eu \
--cc=nirmoy.das@intel.com \
--cc=peterz@infradead.org \
--cc=rodrigo.vivi@intel.com \
--cc=tursulin@ursulin.net \
--cc=tzimmermann@suse.de \
--cc=will@kernel.org \
--cc=zack.rusin@broadcom.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.