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Subject[PATCH v3 6/9] selftests/sgx: Ensure test enclave buffer is entirely preserved
Date
Attach the "used" attribute to instruct the compiler to preserve the static
encl_buffer, even if it appears it is not entirely referenced in the enclave
code, as expected by the external tests manipulating page permissions.

Link: https://lore.kernel.org/all/a2732938-f3db-a0af-3d68-a18060f66e79@cs.kuleuven.be/
Signed-off-by: Jo Van Bulck <jo.vanbulck@cs.kuleuven.be>
---
tools/testing/selftests/sgx/defines.h | 1 +
tools/testing/selftests/sgx/test_encl.c | 9 +++++----
2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/sgx/defines.h b/tools/testing/selftests/sgx/defines.h
index d8587c971..b8f482667 100644
--- a/tools/testing/selftests/sgx/defines.h
+++ b/tools/testing/selftests/sgx/defines.h
@@ -13,6 +13,7 @@

#define __aligned(x) __attribute__((__aligned__(x)))
#define __packed __attribute__((packed))
+#define __used __attribute__((used))

#include "../../../../arch/x86/include/asm/sgx.h"
#include "../../../../arch/x86/include/asm/enclu.h"
diff --git a/tools/testing/selftests/sgx/test_encl.c b/tools/testing/selftests/sgx/test_encl.c
index b09550cb3..c7bcbc85b 100644
--- a/tools/testing/selftests/sgx/test_encl.c
+++ b/tools/testing/selftests/sgx/test_encl.c
@@ -5,11 +5,12 @@
#include "defines.h"

/*
- * Data buffer spanning two pages that will be placed first in .data
- * segment. Even if not used internally the second page is needed by
- * external test manipulating page permissions.
+ * Data buffer spanning two pages that will be placed first in the .data
+ * segment. Even if not used internally the second page is needed by external
+ * test manipulating page permissions, so mark encl_buffer as "used" to make
+ * sure it is entirely preserved by the compiler.
*/
-static uint8_t encl_buffer[8192] = { 1 };
+static uint8_t __used encl_buffer[8192] = { 1 };

enum sgx_enclu_function {
EACCEPT = 0x5,
--
2.25.1
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