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authorJo Van Bulck <jo.vanbulck@cs.kuleuven.be>2023-10-05 18:38:51 +0300
committerDave Hansen <dave.hansen@linux.intel.com>2023-12-08 21:05:27 +0300
commita4c39ef4ed43103caef80029cd30427a9ff342d8 (patch)
tree0016e73939172a984f8a4c2379d28c8668e5b3e6
parent9fd552ee32c6c1e27c125016b87d295bea6faea7 (diff)
downloadlinux-a4c39ef4ed43103caef80029cd30427a9ff342d8.tar.xz
selftests/sgx: Ensure test enclave buffer is entirely preserved
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. Signed-off-by: Jo Van Bulck <jo.vanbulck@cs.kuleuven.be> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Acked-by: Kai Huang <kai.huang@intel.com> Link: https://lore.kernel.org/all/a2732938-f3db-a0af-3d68-a18060f66e79@cs.kuleuven.be/ Link: https://lore.kernel.org/all/20231005153854.25566-11-jo.vanbulck%40cs.kuleuven.be
-rw-r--r--tools/testing/selftests/sgx/defines.h1
-rw-r--r--tools/testing/selftests/sgx/test_encl.c9
2 files changed, 6 insertions, 4 deletions
diff --git a/tools/testing/selftests/sgx/defines.h b/tools/testing/selftests/sgx/defines.h
index d8587c971941..b8f482667ce1 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 649604c526e7..7465f121fb74 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,