linux-kernel - Re: [PATCH V3] powerpc: add little endian flag to syscall_get

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Date:	Mon, 08 Dec 2014 11:16:01 -0800 (PST)
From:	Paul Moore <paul@...l-moore.com>
To:	Richard Guy Briggs <rgb@...hat.com>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-api@...r.kernel.org,
	sgrubb@...hat.com, eparis@...isplace.org, tonyj@...e.de,
	mpe@...erman.id.au, anton@...ba.org
Subject: Re: [PATCH V3] powerpc: add little endian flag to syscall_get_arch()

On Monday, December 08, 2014 12:59:32 PM Richard Guy Briggs wrote:
> Since both ppc and ppc64 have LE variants which are now reported by uname,
> add that flag (__AUDIT_ARCH_LE) to syscall_get_arch() and add
> AUDIT_ARCH_PPC*LE variants.
> 
> Without this,  perf trace and auditctl fail.
> 
> Mainline kernel reports ppc64le (per a058801) but there is no matching
> AUDIT_ARCH_PPC64LE.
> 
> Since 32-bit PPC LE is not supported, throw a compiler error rather than
> return a bogus architecture to audit.
> 
> See:
> 	https://www.redhat.com/archives/linux-audit/2014-August/msg00082.html
> 	https://www.redhat.com/archives/linux-audit/2014-December/msg00004.html
> 
> v2 -> v3:
> 	Throw a compiler error on 32-bit LE.
> 
> v1 -> v2:
> 	Added ";" at the end of the #ifdef-protected line so it actually compiles
> 
> Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> ---
>  arch/powerpc/include/asm/syscall.h |    7 +++++++
>  include/uapi/linux/audit.h         |    1 +
>  2 files changed, 8 insertions(+), 0 deletions(-)

Looks reasonable to me from an audit perspective, but I'll let the ppc folks 
merge this patch into their tree.

Acked-by: Paul Moore <paul@...l-moore.com>

> diff --git a/arch/powerpc/include/asm/syscall.h
> b/arch/powerpc/include/asm/syscall.h index 6fa2708..cf7fcab 100644
> --- a/arch/powerpc/include/asm/syscall.h
> +++ b/arch/powerpc/include/asm/syscall.h
> @@ -90,6 +90,13 @@ static inline void syscall_set_arguments(struct
> task_struct *task,
> 
>  static inline int syscall_get_arch(void)
>  {
> +#ifdef __LITTLE_ENDIAN__
> +	return AUDIT_ARCH_PPC64LE;
> +#ifndef CONFIG_64BIT
> +#error PPC 32-bit Little Endian architecture not supported.
> +#endif /* CONFIG_64BIT */
> +#else /* __LITTLE_ENDIAN__ */
>  	return is_32bit_task() ? AUDIT_ARCH_PPC : AUDIT_ARCH_PPC64;
> +#endif /* __LITTLE_ENDIAN__ */
>  }
>  #endif	/* _ASM_SYSCALL_H */
> diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
> index 4d100c8..fa2a6af 100644
> --- a/include/uapi/linux/audit.h
> +++ b/include/uapi/linux/audit.h
> @@ -365,6 +365,7 @@ enum {
>  #define AUDIT_ARCH_PARISC64	(EM_PARISC|__AUDIT_ARCH_64BIT)
>  #define AUDIT_ARCH_PPC		(EM_PPC)
>  #define AUDIT_ARCH_PPC64	(EM_PPC64|__AUDIT_ARCH_64BIT)
> +#define AUDIT_ARCH_PPC64LE	(EM_PPC64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
>  #define AUDIT_ARCH_S390		(EM_S390)
>  #define AUDIT_ARCH_S390X	(EM_S390|__AUDIT_ARCH_64BIT)
>  #define AUDIT_ARCH_SH		(EM_SH)

-- 
paul moore
www.paul-moore.com

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