Re: [PATCH v6 5/6] arm64: add SIGSYS siginfo for compat task

[AKASHI Takahiro]

On 08/27/2014 02:55 AM, Will Deacon wrote:
> On Thu, Aug 21, 2014 at 09:56:44AM +0100, AKASHI Takahiro wrote:
> > SIGSYS is primarily used in secure computing to notify tracer.
> > This patch allows signal handler on compat task to get correct information
> > with SA_SYSINFO specified when this signal is delivered.
> >
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> > ---
> >   arch/arm64/include/asm/compat.h |    7 +++++++
> >   arch/arm64/kernel/signal32.c    |    8 ++++++++
> >   2 files changed, 15 insertions(+)
> >
> > diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h
> > index 253e33b..c877915 100644
> > --- a/arch/arm64/include/asm/compat.h
> > +++ b/arch/arm64/include/asm/compat.h
> > @@ -205,6 +205,13 @@ typedef struct compat_siginfo {
> >   			compat_long_t _band;	/* POLL_IN, POLL_OUT, POLL_MSG */
> >   			int _fd;
> >   		} _sigpoll;h
> > +
> > +		/* SIGSYS */
> > +		struct {
> > +			compat_uptr_t _call_addr; /* calling user insn */
> > +			int _syscall;	/* triggering system call number */
> > +			unsigned int _arch;	/* AUDIT_ARCH_* of syscall */
> > +		} _sigsys;
> >   	} _sifields;
> >   } compat_siginfo_t;
> >
> > diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c
> > index 1b9ad02..aa550d6 100644
> > --- a/arch/arm64/kernel/signal32.c
> > +++ b/arch/arm64/kernel/signal32.c
> > @@ -186,6 +186,14 @@ int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from)
> >   		err |= __put_user(from->si_uid, &to->si_uid);
> >   		err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, &to->si_ptr);
> >   		break;
> > +#ifdef __ARCH_SIGSYS
> > +	case __SI_SYS:
> > +		err |= __put_user((compat_uptr_t)(unsigned long)
> > +				from->si_call_addr, &to->si_call_addr);
> > +		err |= __put_user(from->si_syscall, &to->si_syscall);
> > +		err |= __put_user(from->si_arch, &to->si_arch);
> > +		break;
> > +#endif
>
> I think you should drop this #ifdef. We care about whether arch/arm/ defines
> __ARCH_SIGSYS, not whether arm64 defines it (they both happen to define it
> anyway).

Thanks. Done

-Takahiro AKASHI

> Will
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