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Message-ID: <CAJgzZor+c3goq41NZQs9UNpzZg01Bfm20+=p=_bd4JbD8gFKvw@mail.gmail.com>
Date: Wed, 4 Jun 2025 13:35:53 -0400
From: enh <enh@...gle.com>
To: musl@...ts.openwall.com
Subject: Re: c23 memset_explicit()
did memset_explicit() make it in, or was this blocked on rewriting
explicit_bzero() to call memset_explicit()?
(we're starting to see more users and thus more portability problems.)
On Tue, Mar 19, 2024 at 8:59 AM Aaron Peter Bachmann <aaron_ng@...de.at> wrote:
>
> I recognized neither
> https://git.musl-libc.org/cgit/musl
> nor
> https://forge.icube.unistra.fr/icps/musl/-/branches
> seem to include c23 memset_explicit().
> Or it slipped my attention.
>
> So I provide a patch. It compiles but is otherwise untested.
> It is trivial enough that you would spot an error when merging.
> No guards for c23 as mem is a reserved prefix.
> It closely follows explicit_bzero.c. So I assume it fits into the coding
> style musl uses.
>
> Regards, Aaron Peter Bachmann
>
>
> diff --git a/include/string.h b/include/string.h
> index 83e2b946..563b3b0a 100644
> --- a/include/string.h
> +++ b/include/string.h
> @@ -27,6 +27,7 @@ extern "C" {
> void *memcpy (void *__restrict, const void *__restrict, size_t);
> void *memmove (void *, const void *, size_t);
> void *memset (void *, int, size_t);
> +void *memset_explicit(void *, int, size_t);
> int memcmp (const void *, const void *, size_t);
> void *memchr (const void *, int, size_t);
>
> diff --git a/src/string/memset_explicit.c b/src/string/memset_explicit.c
> new file mode 100644
> index 00000000..ac54f0cf
> --- /dev/null
> +++ b/src/string/memset_explicit.c
> @@ -0,0 +1,8 @@
> +#include <string.h>
> +
> +void *memset_explicit(void *d, int c, size_t n)
> +{
> + d = memset(d, c, n);
> + __asm__ __volatile__ ("" : : "r"(d) : "memory");
> + return d;
> +}
>
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