linux-kernel - Re: [PATCH] bcachefs: replace deprecated strncpy() with strscpy()

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Message-ID: <vfszytfd66lqj54nmkymhnrdjodylb7l3alxblzixnlzv7kxom@4dji3xuvmknj>
Date: Wed, 26 Mar 2025 12:17:50 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Bharadwaj Raju <bharadwaj.raju777@...il.com>
Cc: Roxana Nicolescu <nicolescu.roxana@...tonmail.com>, 
	Alan Huang <mmpgouride@...il.com>, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	skhan@...uxfoundation.org, linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH] bcachefs: replace deprecated strncpy() with strscpy()

On Wed, Mar 26, 2025 at 09:19:06PM +0530, Bharadwaj Raju wrote:
> On Wed, Mar 26, 2025 at 8:22 PM Kent Overstreet
> <kent.overstreet@...ux.dev> wrote:
> > Or better, a new helper: when we're copying to a fixed size buffer we
> > really want to zero out the rest of the buffer - we don't just want a
> > single terminating nul.
> 
> I believe strscpy_pad does this?
> 
> https://docs.kernel.org/core-api/kernel-api.html#c.strscpy_pad

almost, we don't want the 'required nul termination'; that's a
requirement at least for disk labels where we need to preserve existing
behaviour