Re: [PATCH v6 1/2] arm64: Add audit support

[Richard Guy Briggs]

On 14/02/28, AKASHI Takahiro wrote:
> On AArch64, audit is supported through generic lib/audit.c and
> compat_audit.c, and so this patch adds arch specific definitions required.
> 
> Acked-by Will Deacon <will.deacon@xxxxxxx>
> Acked-by: Richard Guy Briggs <rgb@xxxxxxxxxx>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> ---
>  arch/arm64/Kconfig               |    1 +
>  arch/arm64/include/asm/syscall.h |   15 +++++++++++++++
>  include/uapi/linux/audit.h       |    1 +
>  3 files changed, 17 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 27bbcfc..aa47548 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -25,6 +25,7 @@ config ARM64
>  	select GENERIC_STRNLEN_USER
>  	select GENERIC_TIME_VSYSCALL
>  	select HARDIRQS_SW_RESEND
> +	select HAVE_ARCH_AUDITSYSCALL
>  	select HAVE_ARCH_JUMP_LABEL
>  	select HAVE_ARCH_TRACEHOOK
>  	select HAVE_DEBUG_BUGVERBOSE
> diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h
> index 70ba9d4..6900183 100644
> --- a/arch/arm64/include/asm/syscall.h
> +++ b/arch/arm64/include/asm/syscall.h
> @@ -16,7 +16,9 @@
>  #ifndef __ASM_SYSCALL_H
>  #define __ASM_SYSCALL_H
>  
> +#include <linux/audit.h>

This could be changed to <uapi/linux/audit.h> to pick up the
AUDIT_ARCH_* definitions needed and not any of the audit kernel
funcitons.

>  #include <linux/err.h>
> +#include <asm/compat.h>
>  
>  
>  static inline int syscall_get_nr(struct task_struct *task,
> @@ -104,4 +106,17 @@ static inline void syscall_set_arguments(struct task_struct *task,
>  	memcpy(&regs->regs[i], args, n * sizeof(args[0]));
>  }
>  
> +/*
> + * We don't care about endianness (__AUDIT_ARCH_LE bit) here because
> + * AArch64 has the same system calls both on little- and big- endian.
> + */
> +static inline int syscall_get_arch(struct task_struct *task,
> +				   struct pt_regs *regs)
> +{
> +	if (is_compat_thread(task_thread_info(task)))
> +		return AUDIT_ARCH_ARM;
> +
> +	return AUDIT_ARCH_AARCH64;
> +}
> +
>  #endif	/* __ASM_SYSCALL_H */
> diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
> index 624df43..aa86fab 100644
> --- a/include/uapi/linux/audit.h
> +++ b/include/uapi/linux/audit.h
> @@ -333,6 +333,7 @@ enum {
>  /* distinguish syscall tables */
>  #define __AUDIT_ARCH_64BIT 0x80000000
>  #define __AUDIT_ARCH_LE	   0x40000000
> +#define AUDIT_ARCH_AARCH64	(EM_AARCH64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
>  #define AUDIT_ARCH_ALPHA	(EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
>  #define AUDIT_ARCH_ARM		(EM_ARM|__AUDIT_ARCH_LE)
>  #define AUDIT_ARCH_ARMEB	(EM_ARM)
> -- 
> 1.7.9.5
> 

- RGB

--
Richard Guy Briggs <rbriggs@xxxxxxxxxx>
Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545
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