selftests/seccomp: Get page size from sysconf

The commit fd88d16c58c2 ("selftests/seccomp: Be more precise with
syscall arguments.") use PAGE_SIZE directly which lead to build
failure on arm64.

Replace it with generic interface(sysconf(_SC_PAGESIZE)) to fix this
failure.

Build and test successful on x86_64 and arm64.

Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Tested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index e38cc54..882fe83 100644 (file)
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -492,6 +492,9 @@ TEST_SIGNAL(KILL_one_arg_six, SIGSYS)
        pid_t parent = getppid();
        int fd;
        void *map1, *map2;
+       int page_size = sysconf(_SC_PAGESIZE);
+
+       ASSERT_LT(0, page_size);
 
        ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
        ASSERT_EQ(0, ret);
@@ -504,16 +507,16 @@ TEST_SIGNAL(KILL_one_arg_six, SIGSYS)
 
        EXPECT_EQ(parent, syscall(__NR_getppid));
        map1 = (void *)syscall(sysno,
-               NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, fd, PAGE_SIZE);
+               NULL, page_size, PROT_READ, MAP_PRIVATE, fd, page_size);
        EXPECT_NE(MAP_FAILED, map1);
        /* mmap2() should never return. */
        map2 = (void *)syscall(sysno,
-                NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE);
+                NULL, page_size, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE);
        EXPECT_EQ(MAP_FAILED, map2);
 
        /* The test failed, so clean up the resources. */
-       munmap(map1, PAGE_SIZE);
-       munmap(map2, PAGE_SIZE);
+       munmap(map1, page_size);
+       munmap(map2, page_size);
        close(fd);
 }