linux-hardening - Re: [PATCH] powerpc/ps3: refactor strncpy usage

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Message-ID: <4ceaf4f9-ccc1-c0a6-ee3b-a570355d2131@infradead.org>
Date:   Thu, 17 Aug 2023 12:58:45 -0700
From:   Geoff Levand <geoff@...radead.org>
To:     Justin Stitt <justinstitt@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] powerpc/ps3: refactor strncpy usage

On 8/16/23 14:39, Justin Stitt wrote:
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
> 
> `make_first_field()` should use similar implementation to `make_field()`
> due to memcpy having more obvious behavior here. The end result yields
> the same behavior as the previous `strncpy`-based implementation
> including the NUL-padding.

> diff --git a/arch/powerpc/platforms/ps3/repository.c b/arch/powerpc/platforms/ps3/repository.c
> index 205763061a2d..1abe33fbe529 100644
> --- a/arch/powerpc/platforms/ps3/repository.c
> +++ b/arch/powerpc/platforms/ps3/repository.c
> @@ -73,9 +73,9 @@ static void _dump_node(unsigned int lpar_id, u64 n1, u64 n2, u64 n3, u64 n4,

I tested this on PS3 and it seems to be working OK.

Tested-by: Geoff Levand <geoff@...radead.org>