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SubjectRe: [PATCH 1/4] arch/arm: add syscall_get_arch
On Fri, Nov 02, 2012 at 12:14:57AM +0000, Kees Cook wrote:
> From: Will Drewry <wad@chromium.org>
>
> Provide an ARM implementation of syscall_get_arch. This is a pre-requisite
> for CONFIG_HAVE_ARCH_SECCOMP_FILTER.
>
> Signed-off-by: Will Drewry <wad@chromium.org>
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> arch/arm/include/asm/syscall.h | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/arch/arm/include/asm/syscall.h b/arch/arm/include/asm/syscall.h
> index 9fdded6..803f433 100644
> --- a/arch/arm/include/asm/syscall.h
> +++ b/arch/arm/include/asm/syscall.h
> @@ -7,6 +7,8 @@
> #ifndef _ASM_ARM_SYSCALL_H
> #define _ASM_ARM_SYSCALL_H
>
> +#include <linux/audit.h> /* for AUDIT_ARCH_* */
> +#include <linux/elf.h> /* for ELF_EM */
> #include <linux/err.h>
> #include <linux/sched.h>
>
> @@ -95,4 +97,15 @@ static inline void syscall_set_arguments(struct task_struct *task,
> memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));
> }
>
> +static inline int syscall_get_arch(struct task_struct *task,
> + struct pt_regs *regs)
> +{
> + /* ARM tasks don't change audit architectures on the fly. */
> +#ifdef __ARMEB__
> + return AUDIT_ARCH_ARMEB;
> +#else
> + return AUDIT_ARCH_ARM;
> +#endif
> +}

I think you can just use AUDIT_ARCH_ARM unconditionally here as the syscall
ABI is not related to the endianness of the CPU. I believe AUDIT_ARCH_ARMEB
was added accidentally because somebody incorrectly thought the -EB suffix
signified EABI.

If it wasn't in a user-header I'd be all for deleting the old definition...

Will

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