Re: [PATCH 1/2] arm64: Add seccomp support

[AKASHI Takahiro]

On 02/19/2014 12:38 AM, Catalin Marinas wrote:
> On Fri, Feb 07, 2014 at 10:11:31AM +0000, AKASHI Takahiro wrote:
> > --- a/arch/arm64/kernel/ptrace.c
> > +++ b/arch/arm64/kernel/ptrace.c
> > @@ -26,6 +26,7 @@
> >   #include <linux/smp.h>
> >   #include <linux/ptrace.h>
> >   #include <linux/user.h>
> > +#include <linux/seccomp.h>
> >   #include <linux/security.h>
> >   #include <linux/init.h>
> >   #include <linux/signal.h>
> > @@ -1064,6 +1065,10 @@ asmlinkage int syscall_trace(int dir, struct pt_regs *regs)
> >   {
> >   	unsigned long saved_reg;
> >
> > +	if (!dir && secure_computing((int)regs->syscallno))
> > +		/* seccomp failures shouldn't expose any additional code. */
> > +		return -1;
>
> That's only restricted to the arm64 code but could we use a more
> meaningful error number?

Other architectures, including arm, also return just -1 in syscall_trace_enter(),
but of course, we can use another value, say, -EPERM or -ENOSYS?

-Takahiro AKASHI
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