linux-kernel - Re: [PATCH v6 1/3] arch: vDSO: Add a __vdso_getrandom prototype for all architectures

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <88982e01-9d69-4ac6-a423-ecfe700abc1b@csgroup.eu>
Date: Sun, 1 Sep 2024 20:06:51 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Xi Ruoyao <xry111@...111.site>, "Jason A . Donenfeld" <Jason@...c4.com>,
 Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>
Cc: linux-crypto@...r.kernel.org, loongarch@...ts.linux.dev,
 linux-kernel@...r.kernel.org, Jinyang He <hejinyang@...ngson.cn>,
 Tiezhu Yang <yangtiezhu@...ngson.cn>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v6 1/3] arch: vDSO: Add a __vdso_getrandom prototype for
 all architectures



Le 01/09/2024 à 08:13, Xi Ruoyao a écrit :
> Without a prototype, we'll have to add a prototype for each architecture
> implementing vDSO getrandom.  As most architectures will likely have the
> vDSO getrandom implemented in a near future, and we'd like to keep the
> declarations compatible everywhere (to ease the Glibc work), we should
> really just have one copy of the prototype.

It is a good idea but it have to handle all architectures, not only half 
of them. If you look into vdso_config.h in selftests, you can see that 
there are two names:

__kernel_getrandom is used on arm64, powerpc, s390,

__vdso_getrandom is used on arm, mips, sparc, x86, riscv, loongarch

Christophe



> 
> Suggested-by: Huacai Chen <chenhuacai@...nel.org>
> Signed-off-by: Xi Ruoyao <xry111@...111.site>
> ---
>   arch/x86/entry/vdso/vgetrandom.c | 2 --
>   include/vdso/getrandom.h         | 5 +++++
>   2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/entry/vdso/vgetrandom.c b/arch/x86/entry/vdso/vgetrandom.c
> index 52d3c7faae2e..430862b8977c 100644
> --- a/arch/x86/entry/vdso/vgetrandom.c
> +++ b/arch/x86/entry/vdso/vgetrandom.c
> @@ -6,8 +6,6 @@
>   
>   #include "../../../../lib/vdso/getrandom.c"
>   
> -ssize_t __vdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len);
> -
>   ssize_t __vdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len)
>   {
>   	return __cvdso_getrandom(buffer, len, flags, opaque_state, opaque_len);
> diff --git a/include/vdso/getrandom.h b/include/vdso/getrandom.h
> index 4cf02e678f5e..08b47b002bf7 100644
> --- a/include/vdso/getrandom.h
> +++ b/include/vdso/getrandom.h
> @@ -56,4 +56,9 @@ struct vgetrandom_state {
>    */
>   extern void __arch_chacha20_blocks_nostack(u8 *dst_bytes, const u32 *key, u32 *counter, size_t nblocks);
>   
> +/**
> + * __vdso_getrandom: Prototype of vDSO getrandom.
> + */
> +extern ssize_t __vdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len);
> +
>   #endif /* _VDSO_GETRANDOM_H */