linux-kernel - [PATCH] selftests: seccomp: fix compile error seccomp

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Date:   Fri,  5 Jan 2018 17:31:18 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
To:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     shuah@...nel.org, wad@...omium.org, luto@...capital.net,
        keescook@...omium.org, Anders Roxell <anders.roxell@...aro.org>
Subject: [PATCH] selftests: seccomp: fix compile error seccomp_bpf

aarch64-linux-gnu-gcc -Wl,-no-as-needed -Wall
    -lpthread seccomp_bpf.c -o seccomp_bpf
seccomp_bpf.c: In function 'tracer_ptrace':
seccomp_bpf.c:1720:12: error: '__NR_open' undeclared
    (first use in this function)
  if (nr == __NR_open)
            ^~~~~~~~~
seccomp_bpf.c:1720:12: note: each undeclared identifier is reported
    only once for each function it appears in
In file included from seccomp_bpf.c:48:0:
seccomp_bpf.c: In function 'TRACE_syscall_ptrace_syscall_dropped':
seccomp_bpf.c:1795:39: error: '__NR_open' undeclared
    (first use in this function)
  EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_open));
                                       ^
open(2) is a legacy syscall, replaced with openat(2) since 2.6.16.
Thus new architectures in the kernel, such as arm64, don't implement
these legacy syscalls.

Signed-off-by: Anders Roxell <anders.roxell@...aro.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 24dbf634e2dd..0b457e8e0f0c 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -1717,7 +1717,7 @@ void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee,
 
 	if (nr == __NR_getpid)
 		change_syscall(_metadata, tracee, __NR_getppid);
-	if (nr == __NR_open)
+	if (nr == __NR_openat)
 		change_syscall(_metadata, tracee, -1);
 }
 
@@ -1792,7 +1792,7 @@ TEST_F(TRACE_syscall, ptrace_syscall_dropped)
 					   true);
 
 	/* Tracer should skip the open syscall, resulting in EPERM. */
-	EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_open));
+	EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_openat));
 }
 
 TEST_F(TRACE_syscall, syscall_allowed)
-- 
2.11.0