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

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Message-ID: <547E3508.2080500@suse.de>
Date:	Tue, 02 Dec 2014 13:54:16 -0800
From:	Tony Jones <tonyj@...e.de>
To:	Richard Guy Briggs <rgb@...hat.com>, linux-audit@...hat.com,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-api@...r.kernel.org
CC:	sgrubb@...hat.com, eparis@...isplace.org, pmoore@...hat.com
Subject: Re: [PATCH] powerpc: add little endian flag to syscall_get_arch()

On 12/02/2014 01:27 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.
> 
> See:
> 	https://www.redhat.com/archives/linux-audit/2014-August/msg00082.html
> 	https://www.redhat.com/archives/linux-audit/2014-December/msg00004.html
> 
> Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> ---
>  arch/powerpc/include/asm/syscall.h |    6 +++++-
>  include/uapi/linux/audit.h         |    2 ++
>  2 files changed, 7 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/syscall.h b/arch/powerpc/include/asm/syscall.h
> index 6fa2708..a58acab 100644
> --- a/arch/powerpc/include/asm/syscall.h
> +++ b/arch/powerpc/include/asm/syscall.h
> @@ -90,6 +90,10 @@ static inline void syscall_set_arguments(struct task_struct *task,
>  
>  static inline int syscall_get_arch(void)
>  {
> -	return is_32bit_task() ? AUDIT_ARCH_PPC : AUDIT_ARCH_PPC64;
> +	int arch = is_32bit_task() ? AUDIT_ARCH_PPC : AUDIT_ARCH_PPC64;
> +#ifdef __LITTLE_ENDIAN__
> +	arch |= __AUDIT_ARCH_LE
> +#endif
> +	return arch;
>  }
>  #endif	/* _ASM_SYSCALL_H */
> diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
> index 4d100c8..fe29a99 100644
> --- a/include/uapi/linux/audit.h
> +++ b/include/uapi/linux/audit.h
> @@ -364,7 +364,9 @@ enum {
>  #define AUDIT_ARCH_PARISC	(EM_PARISC)
>  #define AUDIT_ARCH_PARISC64	(EM_PARISC|__AUDIT_ARCH_64BIT)
>  #define AUDIT_ARCH_PPC		(EM_PPC)
> +#define AUDIT_ARCH_PPCLE	(EM_PPC|__AUDIT_ARCH_LE)
>  #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)

IBM would know for certain but I wasn't aware there was a PPCLE (32bit compat).

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