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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

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