linux-kernel - Re: [PATCH] KEYS: Replace all non-returning strlcpy with strscpy

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Message-ID: <CAHC9VhT6qfX9B=nhZNeyOsiaA-vg4bBm=rx8BGiVPCTK1g-L7g@mail.gmail.com>
Date:   Fri, 19 May 2023 17:11:14 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>
Cc:     Azeem Shaikh <azeemshaikh38@...il.com>,
        David Howells <dhowells@...hat.com>,
        linux-hardening@...r.kernel.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org, James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH] KEYS: Replace all non-returning strlcpy with strscpy

On Thu, May 18, 2023 at 2:01 PM Jarkko Sakkinen <jarkko@...nel.org> wrote:
> On Thu May 18, 2023 at 7:15 AM EEST, Azeem Shaikh wrote:
> > strlcpy() reads the entire source buffer first.
> > This read may exceed the destination size limit.
> > This is both inefficient and can lead to linear read
> > overflows if a source string is not NUL-terminated [1].
> > In an effort to remove strlcpy() completely [2], replace
> > strlcpy() here with strscpy().
> > No return values were used, so direct replacement is safe.
> >
> > [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
> > [2] https://github.com/KSPP/linux/issues/89
> >
> > Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>
> > ---
> >  security/keys/request_key_auth.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
> > index 41e9735006d0..8f33cd170e42 100644
> > --- a/security/keys/request_key_auth.c
> > +++ b/security/keys/request_key_auth.c
> > @@ -178,7 +178,7 @@ struct key *request_key_auth_new(struct key *target, const char *op,
> >       if (!rka->callout_info)
> >               goto error_free_rka;
> >       rka->callout_len = callout_len;
> > -     strlcpy(rka->op, op, sizeof(rka->op));
> > +     strscpy(rka->op, op, sizeof(rka->op));
> >
> >       /* see if the calling process is already servicing the key request of
> >        * another process */
>
>
> Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

Since you maintain this code Jarkko, are you planning to merge this
into your tree or would you prefer the KSPP folks merge it?

-- 
paul-moore.com