[PATCH v8 1/5] selftests/sgx: Rename 'eenter' and 'sgx_call_vdso'

Jarkko Sakkinen
2021-06-10T08:30:35Z

Rename symbols for better clarity:

* 'eenter' might be confused for directly calling ENCLU[EENTER]. It does
not. It calls into the VDSO, which actually has the EENTER instruction.
* 'sgx_call_vdso' is *only* used for entering the enclave. It's not some
generic SGX call into the VDSO.

Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
---

v3:
Refine the commit message according to Dave's suggestions.

v2:
Refined the renames just a bit.

tools/testing/selftests/sgx/call.S | 6 +++---
tools/testing/selftests/sgx/main.c | 25 +++++++++++++------------
tools/testing/selftests/sgx/main.h | 4 ++--
3 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/tools/testing/selftests/sgx/call.S b/tools/testing/selftests/sgx/call.S
index 4ecadc7490f4..b09a25890f3b 100644
--- a/tools/testing/selftests/sgx/call.S
+++ b/tools/testing/selftests/sgx/call.S
@@ -5,8 +5,8 @@

.text

- .global sgx_call_vdso
-sgx_call_vdso:
+ .global sgx_enter_enclave
+sgx_enter_enclave:
.cfi_startproc
push %r15
.cfi_adjust_cfa_offset 8
@@ -27,7 +27,7 @@ sgx_call_vdso:
.cfi_adjust_cfa_offset 8
push 0x38(%rsp)
.cfi_adjust_cfa_offset 8
- call *eenter(%rip)
+ call *vdso_sgx_enter_enclave(%rip)
add $0x10, %rsp
.cfi_adjust_cfa_offset -0x10
pop %rbx
diff --git a/tools/testing/selftests/sgx/main.c b/tools/testing/selftests/sgx/main.c
index d304a4044eb9..43da68388e25 100644
--- a/tools/testing/selftests/sgx/main.c
+++ b/tools/testing/selftests/sgx/main.c
@@ -21,7 +21,7 @@
#include "../kselftest.h"

static const uint64_t MAGIC = 0x1122334455667788ULL;
-vdso_sgx_enter_enclave_t eenter;
+vdso_sgx_enter_enclave_t vdso_sgx_enter_enclave;

struct vdso_symtab {
Elf64_Sym *elf_symtab;
@@ -149,7 +149,7 @@ int main(int argc, char *argv[])
{
struct sgx_enclave_run run;
struct vdso_symtab symtab;
- Elf64_Sym *eenter_sym;
+ Elf64_Sym *sgx_enter_enclave_sym;
uint64_t result = 0;
struct encl encl;
unsigned int i;
@@ -194,29 +194,30 @@ int main(int argc, char *argv[])
if (!vdso_get_symtab(addr, &symtab))
goto err;

- eenter_sym = vdso_symtab_get(&symtab, "__vdso_sgx_enter_enclave");
- if (!eenter_sym)
+ sgx_enter_enclave_sym = vdso_symtab_get(&symtab, "__vdso_sgx_enter_enclave");
+ if (!sgx_enter_enclave_sym)
goto err;

- eenter = addr + eenter_sym->st_value;
+ vdso_sgx_enter_enclave = addr + sgx_enter_enclave_sym->st_value;

- ret = sgx_call_vdso((void *)&MAGIC, &result, 0, EENTER, NULL, NULL, &run);
- if (!report_results(&run, ret, result, "sgx_call_vdso"))
+ ret = sgx_enter_enclave((void *)&MAGIC, &result, 0, EENTER,
+ NULL, NULL, &run);
+ if (!report_results(&run, ret, result, "sgx_enter_enclave_unclobbered"))
goto err;

/* Invoke the vDSO directly. */
result = 0;
- ret = eenter((unsigned long)&MAGIC, (unsigned long)&result, 0, EENTER,
- 0, 0, &run);
- if (!report_results(&run, ret, result, "eenter"))
+ ret = vdso_sgx_enter_enclave((unsigned long)&MAGIC, (unsigned long)&result,
+ 0, EENTER, 0, 0, &run);
+ if (!report_results(&run, ret, result, "sgx_enter_enclave"))
goto err;

/* And with an exit handler. */
run.user_handler = (__u64)user_handler;
run.user_data = 0xdeadbeef;
- ret = eenter((unsigned long)&MAGIC, (unsigned long)&result, 0, EENTER,
- 0, 0, &run);
+ ret = vdso_sgx_enter_enclave((unsigned long)&MAGIC, (unsigned long)&result,
+ 0, EENTER, 0, 0, &run);
if (!report_results(&run, ret, result, "user_handler"))
goto err;

diff --git a/tools/testing/selftests/sgx/main.h b/tools/testing/selftests/sgx/main.h
index 67211a708f04..68672fd86cf9 100644
--- a/tools/testing/selftests/sgx/main.h
+++ b/tools/testing/selftests/sgx/main.h
@@ -35,7 +35,7 @@ bool encl_load(const char *path, struct encl *encl);
bool encl_measure(struct encl *encl);
bool encl_build(struct encl *encl);

-int sgx_call_vdso(void *rdi, void *rsi, long rdx, u32 function, void *r8, void *r9,
- struct sgx_enclave_run *run);
+int sgx_enter_enclave(void *rdi, void *rsi, long rdx, u32 function, void *r8, void *r9,
+ struct sgx_enclave_run *run);

#endif /* MAIN_H */
--
2.31.1