linux-kernel - Re: [PATCH] selftests/seccomp: sh: Fix register names

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Date:   Fri, 20 Nov 2020 11:05:16 -0800
From:   Kees Cook <keescook@...omium.org>
To:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc:     linux-kernel@...r.kernel.org,
        Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>,
        Rich Felker <dalias@...c.org>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH] selftests/seccomp: sh: Fix register names

On Tue, Nov 17, 2020 at 11:57:20PM +0100, John Paul Adrian Glaubitz wrote:
> On 11/17/20 9:56 PM, Kees Cook wrote:
> > It looks like the seccomp selftests were never actually built for sh.
> > This fixes it, though I don't have an environment to do a runtime test
> > of it yet.
> > 
> > Fixes: 0bb605c2c7f2b4b3 ("sh: Add SECCOMP_FILTER")
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > ---
> >  tools/testing/selftests/seccomp/seccomp_bpf.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
> > index 7f7ecfcd66db..26c72f2b61b1 100644
> > --- a/tools/testing/selftests/seccomp/seccomp_bpf.c
> > +++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
> > @@ -1804,8 +1804,8 @@ TEST_F(TRACE_poke, getpid_runs_normally)
> >  #define SYSCALL_RET(_regs)	(_regs).a[(_regs).windowbase * 4 + 2]
> >  #elif defined(__sh__)
> >  # define ARCH_REGS		struct pt_regs
> > -# define SYSCALL_NUM(_regs)	(_regs).gpr[3]
> > -# define SYSCALL_RET(_regs)	(_regs).gpr[0]
> > +# define SYSCALL_NUM(_regs)	(_regs).regs[3]
> > +# define SYSCALL_RET(_regs)	(_regs).regs[0]
> >  #else
> >  # error "Do not know how to find your architecture's registers and syscalls"
> >  #endif
> 
> Yes, this fix is indeed necessary. However, there is another build issue that I ran into

Okay, thanks! (I'll add a Tested-by for you...)

> and I'm not sure why it happens, but commenting out "#include <linux/sched.h>" in
> ../clone3/clone3_selftests.h fixes it.
> 
> root@...pitz:..selftests/seccomp> make
> gcc -Wl,-no-as-needed -Wall  -lpthread  seccomp_bpf.c /usr/src/linux-5.9.8/tools/testing/selftests/kselftest_harness.h /usr/src/linux-5.9.8/tools/testing/selftests/kselftest.h  -o /usr/src/linux-5.9.8/tools/testing/selftests/seccomp/seccomp_bpf
> In file included from seccomp_bpf.c:55:
> ../clone3/clone3_selftests.h:28:8: error: redefinition of ‘struct clone_args’
>    28 | struct clone_args {
>       |        ^~~~~~~~~~
> In file included from ../clone3/clone3_selftests.h:8,
>                  from seccomp_bpf.c:55:
> /usr/include/linux/sched.h:92:8: note: originally defined here
>    92 | struct clone_args {
>       |        ^~~~~~~~~~
> make: *** [../lib.mk:140: /usr/src/linux-5.9.8/tools/testing/selftests/seccomp/seccomp_bpf] Error 1

I think this was fixed separately:
https://lore.kernel.org/lkml/160464840151.97255.15344214064240834294.sendpatchset@MacBook-Pro.local/

-- 
Kees Cook