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From:   Kees Cook <keescook@chromium.org>
To:     linux-kernel@vger.kernel.org
Cc:     Kees Cook <keescook@chromium.org>,
        Thadeu Lima de Souza Cascardo <cascardo@canonical.com>,
        Max Filippov <jcmvbkbc@gmail.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Christian Brauner <christian@brauner.io>,
        Andy Lutomirski <luto@amacapital.net>,
        Will Drewry <wad@chromium.org>,
        linux-kselftest@vger.kernel.org, linux-mips@vger.kernel.org,
        linux-xtensa@linux-xtensa.org,
        linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 05/15] selftests/seccomp: arm64: Define SYSCALL_NUM_SET macro
Date:   Sat, 12 Sep 2020 04:08:10 -0700
Message-Id: <20200912110820.597135-6-keescook@chromium.org>
In-Reply-To: <20200912110820.597135-1-keescook@chromium.org>
References: <20200912110820.597135-1-keescook@chromium.org>
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Remove the arm64 special-case in change_syscall().

Signed-off-by: Kees Cook <keescook@chromium.org>
---
 tools/testing/selftests/seccomp/seccomp_bpf.c | 27 +++++++++----------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index 610fc036e374..cfa606d96086 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -1717,6 +1717,18 @@ TEST_F(TRACE_poke, getpid_runs_normally)
 #elif defined(__aarch64__)
 # define ARCH_REGS		struct user_pt_regs
 # define SYSCALL_NUM(_regs)	(_regs).regs[8]
+# ifndef NT_ARM_SYSTEM_CALL
+#  define NT_ARM_SYSTEM_CALL 0x404
+# endif
+# define SYSCALL_NUM_SET(_regs, _nr)				\
+	do {							\
+		struct iovec __v;				\
+		typeof(_nr) __nr = (_nr);			\
+		__v.iov_base = &__nr;				\
+		__v.iov_len = sizeof(__nr);			\
+		EXPECT_EQ(0, ptrace(PTRACE_SETREGSET, tracee,	\
+				    NT_ARM_SYSTEM_CALL, &__v));	\
+	} while (0)
 # define SYSCALL_RET(_regs)	(_regs).regs[0]
 #elif defined(__riscv) && __riscv_xlen == 64
 # define ARCH_REGS		struct user_regs_struct
@@ -1852,23 +1864,10 @@ 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(__mips__) || defined(__arm__)
+	defined(__mips__) || defined(__arm__) || defined(__aarch64__)
 	{
 		SYSCALL_NUM_SET(regs, syscall);
 	}
-
-#elif defined(__aarch64__)
-# ifndef NT_ARM_SYSTEM_CALL
-#  define NT_ARM_SYSTEM_CALL 0x404
-# endif
-	{
-		iov.iov_base = &syscall;
-		iov.iov_len = sizeof(syscall);
-		ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL,
-			     &iov);
-		EXPECT_EQ(0, ret);
-	}
-
 #else
 	ASSERT_EQ(1, 0) {
 		TH_LOG("How is the syscall changed on this architecture?");
-- 
2.25.1