linux-kernel - Re: [PATCH v2] fs/coredump: Enable dynamic configuration of max file note size

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Date: Thu, 2 May 2024 14:35:14 -0700
From: Luis Chamberlain <mcgrof@...nel.org>
To: Allen <allen.lkml@...il.com>
Cc: Kees Cook <keescook@...omium.org>,
	Allen Pais <apais@...ux.microsoft.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, viro@...iv.linux.org.uk, brauner@...nel.org,
	jack@...e.cz, ebiederm@...ssion.com, j.granados@...sung.com
Subject: Re: [PATCH v2] fs/coredump: Enable dynamic configuration of max file
 note size

On Thu, May 02, 2024 at 01:03:52PM -0700, Allen wrote:
> +int proc_core_file_note_size_max(struct ctl_table *table, int write,
> void __user *buffer, size_t *lenp, loff_t *ppos) {
> +    int error = proc_douintvec(table, write, buffer, lenp, ppos);
> +    if (write && (core_file_note_size_max < MAX_FILE_NOTE_SIZE ||
> core_file_note_size_max > MAX_ALLOWED_NOTE_SIZE))
> +        core_file_note_size_max = MAX_FILE_NOTE_SIZE;  // Revert to
> default if out of bounds
> +    return error;
> +}

There's already a proc helper which let's you set min / max.

  Luis