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Date: Fri, 18 Sep 2020 15:00:01 -0700 From: Kees Cook <keescook@...omium.org> To: Christian Brauner <christian.brauner@...ntu.com> Cc: linux-kernel@...r.kernel.org, Thadeu Lima de Souza Cascardo <cascardo@...onical.com>, Max Filippov <jcmvbkbc@...il.com>, Michael Ellerman <mpe@...erman.id.au>, Christian Brauner <christian@...uner.io>, Andy Lutomirski <luto@...capital.net>, Will Drewry <wad@...omium.org>, linux-kselftest@...r.kernel.org, linux-mips@...r.kernel.org, linux-xtensa@...ux-xtensa.org, linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org Subject: Re: [PATCH 03/15] selftests/seccomp: mips: Define SYSCALL_NUM_SET macro On Tue, Sep 15, 2020 at 05:55:46PM +0200, Christian Brauner wrote: > On Sat, Sep 12, 2020 at 04:08:08AM -0700, Kees Cook wrote: > > Remove the mips special-case in change_syscall(). > > > > Signed-off-by: Kees Cook <keescook@...omium.org> > > --- > > tools/testing/selftests/seccomp/seccomp_bpf.c | 17 +++++++++-------- > > 1 file changed, 9 insertions(+), 8 deletions(-) > > > > diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c > > index 1c83e743bfb1..02a9a6599746 100644 > > --- a/tools/testing/selftests/seccomp/seccomp_bpf.c > > +++ b/tools/testing/selftests/seccomp/seccomp_bpf.c > > @@ -1742,6 +1742,13 @@ TEST_F(TRACE_poke, getpid_runs_normally) > > # define ARCH_REGS struct pt_regs > > # define SYSCALL_NUM(_regs) (_regs).regs[2] > > # define SYSCALL_SYSCALL_NUM regs[4] > > +# define SYSCALL_NUM_SET(_regs, _nr) \ > > + do { \ > > + if ((_regs).regs[2] == __NR_O32_Linux) \ > > + (_regs).regs[4] = _nr; \ > > + else \ > > + (_regs).regs[2] = _nr; \ > > + } while (0) > > I think that > > # define SYSCALL_NUM_SET(_regs, _nr) \ > do { \ > if (SYSCALL_NUM(_regs) == __NR_O32_Linux) \ > (_regs).regs[4] = _nr; \ > else \ > (_regs).regs[2] = _nr; \ > } while (0) > > would read better but that's just a matter of taste. :) That's how I started originally, but when I realized that I'd have to reorganize SYSCALL_NUM() too, it seem best to have minimal churn, so I left it open coded here, since that's how it needs to be in the end. > Looks good! > Acked-by: Christian Brauner <christian.brauner@...ntu.com> Thanks for the reviews! -- Kees Cook
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