selftests/x86/ioperm: Extend testing so the shared bitmap is exercised

Add code to the fork path which forces the shared bitmap to be duplicated
and the reference count to be dropped. Verify that the child modifications
did not affect the parent.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/tools/testing/selftests/x86/ioperm.c b/tools/testing/selftests/x86/ioperm.c
index 01de41c1b7251da297f7e4bd27424b745ddb7136..57ec5e99edb938d932fe81092660d137616cf2ad 100644 (file)
--- a/tools/testing/selftests/x86/ioperm.c
+++ b/tools/testing/selftests/x86/ioperm.c
@@ -131,6 +131,17 @@ int main(void)
                printf("[RUN]\tchild: check that we inherited permissions\n");
                expect_ok(0x80);
                expect_gp(0xed);
+               printf("[RUN]\tchild: Extend permissions to 0x81\n");
+               if (ioperm(0x81, 1, 1) != 0) {
+                       printf("[FAIL]\tioperm(0x81, 1, 1) failed (%d)", errno);
+                       return 1;
+               }
+               printf("[RUN]\tchild: Drop permissions to 0x80\n");
+               if (ioperm(0x80, 1, 0) != 0) {
+                       printf("[FAIL]\tioperm(0x80, 1, 0) failed (%d)", errno);
+                       return 1;
+               }
+               expect_gp(0x80);
                return 0;
        } else {
                int status;
@@ -146,8 +157,11 @@ int main(void)
                }
        }
 
-       /* Test the capability checks. */
+       /* Verify that the child dropping 0x80 did not affect the parent */
+       printf("\tVerify that unsharing the bitmap worked\n");
+       expect_ok(0x80);
 
+       /* Test the capability checks. */
        printf("\tDrop privileges\n");
        if (setresuid(1, 1, 1) != 0) {
                printf("[WARN]\tDropping privileges failed\n");