diff mbox series

[03/15] selftests/seccomp: mips: Define SYSCALL_NUM_SET macro

Message ID 20200912110820.597135-4-keescook@chromium.org
State New
Headers show
Series selftests/seccomp: Refactor change_syscall() | expand

Commit Message

Kees Cook Sept. 12, 2020, 11:08 a.m. UTC
Remove the mips special-case in change_syscall().

Signed-off-by: Kees Cook <keescook@chromium.org>
---
 tools/testing/selftests/seccomp/seccomp_bpf.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

Comments

Christian Brauner Sept. 15, 2020, 3:55 p.m. UTC | #1
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@chromium.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. :)

Looks good!
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Kees Cook Sept. 18, 2020, 10 p.m. UTC | #2
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@chromium.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@ubuntu.com>

Thanks for the reviews!
diff mbox series

Patch

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)
 # define SYSCALL_RET(_regs)	(_regs).regs[2]
 # define SYSCALL_NUM_RET_SHARE_REG
 #elif defined(__xtensa__)
@@ -1839,17 +1846,11 @@  void change_syscall(struct __test_metadata *_metadata,
 
 #if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
 	defined(__s390__) || defined(__hppa__) || defined(__riscv) || \
-	defined(__xtensa__) || defined(__csky__) || defined(__sh__)
+	defined(__xtensa__) || defined(__csky__) || defined(__sh__) || \
+	defined(__mips__)
 	{
 		SYSCALL_NUM_SET(regs, syscall);
 	}
-#elif defined(__mips__)
-	{
-		if (SYSCALL_NUM(regs) == __NR_O32_Linux)
-			regs.SYSCALL_SYSCALL_NUM = syscall;
-		else
-			SYSCALL_NUM_SET(regs, syscall);
-	}
 
 #elif defined(__arm__)
 # ifndef PTRACE_SET_SYSCALL