From: "Luck, Tony" <tony.luck@intel.com>
To: Avadhut Naik <avadnaik@amd.com>
Cc: "rafael@kernel.org" <rafael@kernel.org>,
"lenb@kernel.org" <lenb@kernel.org>,
"james.morse@arm.com" <james.morse@arm.com>,
"bp@alien8.de" <bp@alien8.de>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"alexey.kardashevskiy@amd.com" <alexey.kardashevskiy@amd.com>,
"yazen.ghannam@amd.com" <yazen.ghannam@amd.com>,
Avadhut Naik <avadhut.naik@amd.com>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>
Subject: RE: [RESEND v5 2/4] fs: debugfs: Add write functionality to debugfs blobs
Date: Thu, 16 Nov 2023 18:44:33 +0000 [thread overview]
Message-ID: <SJ1PR11MB6083BC35F108E319B7C898DAFCB0A@SJ1PR11MB6083.namprd11.prod.outlook.com> (raw)
In-Reply-To: <71ad8b0e-984b-4739-a940-82c5a1456f50@amd.com>
> > The minimalist change here would be to s/0444/0666/
> >
> Just realized that s/0444/0644/ might be an even more minimalist change since you anyways,
> I think, need to be root for error injection through einj. Does that sound good?
You need write access. I don't think you need to be root. E.g. a validation system might
set up an "einj" group and "chmod" all these files to 0664. But that's nitpicking.
>
> In any case, using 0666 will result in the below checkpatch warning:
>
> [root avadnaik-linux]# ./scripts/checkpatch.pl --strict -g HEAD
> WARNING: Exporting world writable files is usually an error. Consider more restrictive permissions.
> #84: FILE: fs/debugfs/file.c:1063:
> + return debugfs_create_file_unsafe(name, mode & 0666, parent, blob, &fops_blob);
>
> total: 0 errors, 1 warnings, 0 checks, 54 lines checked
The warning is dubious. This code isn't necessarily exporting a world writeable file. But
it does allow a caller of this routine to do that.
>
> Would you be okay with s/0444/0644/?
> - return debugfs_create_file_unsafe(name, mode & 0444, parent, blob, &fops_blob);
> + return debugfs_create_file_unsafe(name, mode & 0644, parent, blob, &fops_blob);
Yes. This is fine (better). Make sure to mention in the commit comment that this allows
callers to create files writeable by owner.
-Tony
next prev parent reply other threads:[~2023-11-16 18:45 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-07 21:36 [RESEND v5 0/4] Add support for Vendor Defined Error Types in Einj Module Avadhut Naik
2023-11-07 21:36 ` [RESEND v5 1/4] ACPI: APEI: EINJ: Refactor available_error_type_show() Avadhut Naik
2023-11-08 20:19 ` Borislav Petkov
2023-11-16 21:46 ` Avadhut Naik
2023-11-07 21:36 ` [RESEND v5 2/4] fs: debugfs: Add write functionality to debugfs blobs Avadhut Naik
2023-11-07 22:28 ` Luck, Tony
2023-11-08 18:09 ` Avadhut Naik
2023-11-16 17:54 ` Avadhut Naik
2023-11-16 18:44 ` Luck, Tony [this message]
2023-11-16 21:46 ` Avadhut Naik
2023-11-07 21:36 ` [RESEND v5 3/4] platform/chrome: cros_ec_debugfs: Fix permissions for panicinfo Avadhut Naik
2023-11-07 22:35 ` Luck, Tony
2023-11-08 18:11 ` Avadhut Naik
2023-11-07 21:36 ` [RESEND v5 4/4] ACPI: APEI: EINJ: Add support for vendor defined error types Avadhut Naik
2023-11-07 22:41 ` Luck, Tony
2023-11-15 12:33 ` Borislav Petkov
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=SJ1PR11MB6083BC35F108E319B7C898DAFCB0A@SJ1PR11MB6083.namprd11.prod.outlook.com \
--to=tony.luck@intel.com \
--cc=alexey.kardashevskiy@amd.com \
--cc=avadhut.naik@amd.com \
--cc=avadnaik@amd.com \
--cc=bp@alien8.de \
--cc=gregkh@linuxfoundation.org \
--cc=james.morse@arm.com \
--cc=lenb@kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=rafael@kernel.org \
--cc=yazen.ghannam@amd.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.