linux-hardening - Re: [PATCH v2] crypto: Replace strlcpy with strscpy

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Message-ID: <ZLEMhT11ApSYuK2n@gondor.apana.org.au>
Date:   Fri, 14 Jul 2023 18:51:17 +1000
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Biggers <ebiggers@...nel.org>,
        linux-hardening@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] crypto: Replace strlcpy with strscpy

On Tue, Jun 20, 2023 at 08:08:32PM +0000, 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().
> 
> Direct replacement is safe here since return value of -errno
> is used to check for truncation instead of sizeof(dest).
> 
> [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>
> ---
> v2:
>  * Use "int len" instead of "unsigned len" to hold return value of strscpy.
> 
> v1:
>  * https://lore.kernel.org/all/20230613002258.3535506-1-azeemshaikh38@gmail.com/
> 
>  crypto/lrw.c |    6 +++---
>  crypto/xts.c |    6 +++---
>  2 files changed, 6 insertions(+), 6 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt