From: Jann Horn <jannh@google.com>
To: Daniel Colascione <dancol@google.com>
Cc: Linux API <linux-api@vger.kernel.org>,
kernel list <linux-kernel@vger.kernel.org>,
Lokesh Gidra <lokeshgidra@google.com>,
Nick Kralevich <nnk@google.com>,
nosh@google.com, Tim Murray <timmurray@google.com>
Subject: Re: [PATCH 1/7] Add a new flags-accepting interface for anonymous inodes
Date: Mon, 14 Oct 2019 17:38:45 +0200 [thread overview]
Message-ID: <CAG48ez3yOPAC3mTJdQ5_8aARQPe+siid5jaa8U+aMtfj-bUJ2g@mail.gmail.com> (raw)
In-Reply-To: <20191012191602.45649-2-dancol@google.com>
On Sat, Oct 12, 2019 at 9:16 PM Daniel Colascione <dancol@google.com> wrote:
> Add functions forwarding from the old names to the new ones so we
> don't need to change any callers.
This patch does more than the commit message says; it also refactors
the body of the function. (I would've moved that refactoring over into
patch 2, but I guess this works, too.)
[...]
> -struct file *anon_inode_getfile(const char *name,
> - const struct file_operations *fops,
> - void *priv, int flags)
> +struct file *anon_inode_getfile2(const char *name,
> + const struct file_operations *fops,
> + void *priv, int flags, int anon_inode_flags)
(AFAIK, normal kernel style is to slap a "__" prefix in front of the
function name instead of appending a digit, but I guess it doesn't
really matter.)
> {
> + struct inode *inode;
> struct file *file;
>
> - if (IS_ERR(anon_inode_inode))
> - return ERR_PTR(-ENODEV);
> -
> - if (fops->owner && !try_module_get(fops->owner))
> - return ERR_PTR(-ENOENT);
> + if (anon_inode_flags)
> + return ERR_PTR(-EINVAL);
>
> + inode = anon_inode_inode;
> + if (IS_ERR(inode))
> + return ERR_PTR(-ENODEV);
> /*
> - * We know the anon_inode inode count is always greater than zero,
> - * so ihold() is safe.
> + * We know the anon_inode inode count is always
> + * greater than zero, so ihold() is safe.
> */
This looks like maybe you started editing the comment, then un-did the
change, but left the modified line wrapping in your patch? Please
avoid that - code changes with no real reason make "git blame" output
more annoying and create trouble when porting patches between kernel
versions.
[...]
> EXPORT_SYMBOL_GPL(anon_inode_getfile);
> +EXPORT_SYMBOL_GPL(anon_inode_getfile2);
[...]
> EXPORT_SYMBOL_GPL(anon_inode_getfd);
> +EXPORT_SYMBOL_GPL(anon_inode_getfd2);
Since anon_inode_getfd() is now a static inline function in
include/linux/anon_inodes.h, exporting it doesn't make sense anymore.
Same for anon_inode_getfile().
[...]
> +#define ANON_INODE_SECURE 1
That #define belongs in a later patch, right?
next prev parent reply other threads:[~2019-10-14 15:39 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-12 19:15 [PATCH 0/7] Harden userfaultfd Daniel Colascione
2019-10-12 19:15 ` [PATCH 1/7] Add a new flags-accepting interface for anonymous inodes Daniel Colascione
2019-10-14 4:26 ` kbuild test robot
2019-10-14 15:38 ` Jann Horn [this message]
2019-10-14 18:15 ` Daniel Colascione
2019-10-14 18:30 ` Jann Horn
2019-10-15 8:08 ` Christoph Hellwig
2019-10-12 19:15 ` [PATCH 2/7] Add a concept of a "secure" anonymous file Daniel Colascione
2019-10-14 3:01 ` kbuild test robot
2019-10-15 8:08 ` Christoph Hellwig
2019-10-12 19:15 ` [PATCH 3/7] Add a UFFD_SECURE flag to the userfaultfd API Daniel Colascione
2019-10-12 23:10 ` Andy Lutomirski
2019-10-13 0:51 ` Daniel Colascione
2019-10-13 1:14 ` Andy Lutomirski
2019-10-13 1:38 ` Daniel Colascione
2019-10-14 16:04 ` Jann Horn
2019-10-23 19:09 ` Andrea Arcangeli
2019-10-23 19:21 ` Andy Lutomirski
2019-10-23 21:16 ` Andrea Arcangeli
2019-10-23 21:25 ` Andy Lutomirski
2019-10-23 22:41 ` Andrea Arcangeli
2019-10-23 23:01 ` Andy Lutomirski
2019-10-23 23:27 ` Andrea Arcangeli
2019-10-23 20:05 ` Daniel Colascione
2019-10-24 0:23 ` Andrea Arcangeli
2019-10-23 20:15 ` Linus Torvalds
2019-10-24 9:02 ` Mike Rapoport
2019-10-24 15:10 ` Andrea Arcangeli
2019-10-25 20:12 ` Mike Rapoport
2019-10-22 21:27 ` Daniel Colascione
2019-10-23 4:11 ` Andy Lutomirski
2019-10-23 7:29 ` Cyrill Gorcunov
2019-10-23 12:43 ` Mike Rapoport
2019-10-23 17:13 ` Andy Lutomirski
2019-10-12 19:15 ` [PATCH 4/7] Teach SELinux about a new userfaultfd class Daniel Colascione
2019-10-12 23:08 ` Andy Lutomirski
2019-10-13 0:11 ` Daniel Colascione
2019-10-13 0:46 ` Andy Lutomirski
2019-10-12 19:16 ` [PATCH 5/7] Let userfaultfd opt out of handling kernel-mode faults Daniel Colascione
2019-10-12 19:16 ` [PATCH 6/7] Allow users to require UFFD_SECURE Daniel Colascione
2019-10-12 23:12 ` Andy Lutomirski
2019-10-12 19:16 ` [PATCH 7/7] Add a new sysctl for limiting userfaultfd to user mode faults Daniel Colascione
2019-10-16 0:02 ` [PATCH 0/7] Harden userfaultfd James Morris
2019-11-15 15:09 ` Stephen Smalley
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=CAG48ez3yOPAC3mTJdQ5_8aARQPe+siid5jaa8U+aMtfj-bUJ2g@mail.gmail.com \
--to=jannh@google.com \
--cc=dancol@google.com \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=lokeshgidra@google.com \
--cc=nnk@google.com \
--cc=nosh@google.com \
--cc=timmurray@google.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).