Re: [PATCH v4 3/3] arm64: audit: Add audit hook in ptrace/syscall_trace

[Will Deacon]

On Fri, Feb 07, 2014 at 10:10:03AM +0000, AKASHI Takahiro wrote:
> This patch adds auditing functions on entry to or exit from
> every system call invocation.
> 
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> ---
>  arch/arm64/kernel/ptrace.c |    7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
> index 64ce39f..8cdba09 100644
> --- a/arch/arm64/kernel/ptrace.c
> +++ b/arch/arm64/kernel/ptrace.c
> @@ -19,6 +19,7 @@
>   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
>   */
>  
> +#include <linux/audit.h>
>  #include <linux/kernel.h>
>  #include <linux/sched.h>
>  #include <linux/mm.h>
> @@ -38,6 +39,7 @@
>  #include <asm/compat.h>
>  #include <asm/debug-monitors.h>
>  #include <asm/pgtable.h>
> +#include <asm/syscall.h>
>  #include <asm/traps.h>
>  #include <asm/system_misc.h>
>  
> @@ -1076,10 +1078,15 @@ asmlinkage int syscall_trace(int dir, struct pt_regs *regs)
>  	}
>  
>  	if (dir) {
> +		audit_syscall_exit(regs);
>  		tracehook_report_syscall_exit(regs, 0);
>  	} else {
>  		if (tracehook_report_syscall_entry(regs))
>  			regs->syscallno = ~0UL;
> +		audit_syscall_entry(syscall_get_arch(current, regs),
> +			(int)regs->syscallno,
> +			regs->orig_x0, regs->regs[1],
> +			regs->regs[2], regs->regs[3]);

Again, I don't think we should just lump tracehook and audit together like
this without checking the flags (see my reply to the previous patch series).

Will
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