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Message-ID: <202310101658.8D498F16F@keescook> Date: Tue, 10 Oct 2023 16:59:10 -0700 From: Kees Cook <keescook@...omium.org> To: Justin Stitt <justinstitt@...gle.com> Cc: Marcin Wojtas <mw@...ihalf.com>, Russell King <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH] net: mvpp2: replace deprecated strncpy with strscpy On Tue, Oct 10, 2023 at 09:24:42PM +0000, Justin Stitt wrote: > `strncpy` is deprecated for use on NUL-terminated destination strings > [1] and as such we should prefer more robust and less ambiguous string > interfaces. > > We expect `irqname` to be NUL-terminated based on its use with > of_irq_get_byname() -> of_property_match_string() wherein it is used > with a format string and a `strcmp`: > | pr_debug("comparing %s with %s\n", string, p); > | if (strcmp(string, p) == 0) > | return i; /* Found it; return index */ > > NUL-padding is not required as is evident by other assignments to > `irqname` which do not NUL-pad: > | if (port->flags & MVPP2_F_DT_COMPAT) > | snprintf(irqname, sizeof(irqname), "tx-cpu%d", i); > | else > | snprintf(irqname, sizeof(irqname), "hif%d", i); > > Considering the above, a suitable replacement is `strscpy` [2] due to > the fact that it guarantees NUL-termination on the destination buffer > without unnecessarily NUL-padding. > > Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] > Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] > Link: https://github.com/KSPP/linux/issues/90 > Cc: linux-hardening@...r.kernel.org > Signed-off-by: Justin Stitt <justinstitt@...gle.com> Yup, direct replacement. Reviewed-by: Kees Cook <keescook@...omium.org> -- Kees Cook
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