linux-kernel - Re: [PATCH] xfs: replace strncpy with memcpy in xattr listing

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Message-ID: <CAH4c4j+dhh9uW=GOoxaaefBTWQtbLeWQs1SqrWwpka9R8mwBTg@mail.gmail.com>
Date: Mon, 30 Jun 2025 18:18:06 +0530
From: Pranav Tyagi <pranav.tyagi03@...il.com>
To: Carlos Maiolino <cem@...nel.org>
Cc: skhan@...uxfoundation.org, linux-xfs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH] xfs: replace strncpy with memcpy in xattr listing

On Mon, Jun 30, 2025 at 5:49 PM Carlos Maiolino <cem@...nel.org> wrote:
>
> On Tue, Jun 17, 2025 at 06:44:46PM +0530, Pranav Tyagi wrote:
> > Use memcpy() in place of strncpy() in __xfs_xattr_put_listent().
> > The length is known and a null byte is added manually.
> >
> > No functional change intended.
> >
> > Signed-off-by: Pranav Tyagi <pranav.tyagi03@...il.com>
> > ---
> >  fs/xfs/xfs_xattr.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
> > index 0f641a9091ec..ac5cecec9aa1 100644
> > --- a/fs/xfs/xfs_xattr.c
> > +++ b/fs/xfs/xfs_xattr.c
> > @@ -243,7 +243,7 @@ __xfs_xattr_put_listent(
> >       offset = context->buffer + context->count;
> >       memcpy(offset, prefix, prefix_len);
> >       offset += prefix_len;
> > -     strncpy(offset, (char *)name, namelen);                 /* real name */
> > +     memcpy(offset, (char *)name, namelen);                  /* real name */
> >       offset += namelen;
> >       *offset = '\0';
>
> What difference does it make?

I intended this to be a cleanup patch as strncpy()
is deprecated and its use discouraged.

Regards
Pranav Tyagi
>
>
> >
> > --
> > 2.49.0
> >