On Fri, Jan 5, 2018 at 6:29 PM, Naresh Kamboju naresh.kamboju@linaro.org wrote:
On 5 January 2018 at 22:01, Anders Roxell anders.roxell@linaro.org wrote:
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@linaro.org
Thanks for the patch Anders. Tested-by: Naresh Kamboju naresh.kamboju@linaro.org
Did something change recently? This has built fine on arm64 for a while -- at least since commit 256d0afb11d6 ("selftests/seccomp: build and pass on arm64").
-Kees
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