linux-kernel - RE: [RESEND v5 2/4] fs: debugfs: Add write functionality to debugfs blobs

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Message-ID: <SJ1PR11MB608345F0C62627E7A0520449FCA9A@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date:   Tue, 7 Nov 2023 22:28:27 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Avadhut Naik <avadhut.naik@....com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
CC:     "rafael@...nel.org" <rafael@...nel.org>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "james.morse@....com" <james.morse@....com>,
        "bp@...en8.de" <bp@...en8.de>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alexey.kardashevskiy@....com" <alexey.kardashevskiy@....com>,
        "yazen.ghannam@....com" <yazen.ghannam@....com>,
        "avadnaik@....com" <avadnaik@....com>
Subject: RE: [RESEND v5 2/4] fs: debugfs: Add write functionality to debugfs
 blobs

> @@ -1042,7 +1060,7 @@ struct dentry *debugfs_create_blob(const char *name, umode_t mode,
> 				   struct dentry *parent,
> 				   struct debugfs_blob_wrapper *blob)
> {
> -	return debugfs_create_file_unsafe(name, mode & 0444, parent, blob, &fops_blob);
> +	return debugfs_create_file_unsafe(name, mode, parent, blob, &fops_blob);
> }

The minimalist change here would be to s/0444/0666/

That would just allow callers to ask for writeable files without letting them
add execute permission, or exotic modes like setuid etc.

-Tony