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Subject[RFC PATCH v1 3/3] selftests/x86: Augment SGX selftest to test new __vdso_sgx_enter_enclave() and its callback interface
Date
Given the changes to __vdso_sgx_enter_enclave(), the selftest is augmented to
test the newly added callback interface. This addtional test marks the whole
enclave range as PROT_READ, and calls mprotect() upon #PFs to add necessary PTE
permissions per PFEC (#PF Error Code) until the enclave finishes.

Signed-off-by: Cedric Xing <cedric.xing@intel.com>
---
tools/testing/selftests/x86/sgx/main.c | 123 ++++++++++++++++++---
tools/testing/selftests/x86/sgx/sgx_call.S | 40 ++++++-
2 files changed, 142 insertions(+), 21 deletions(-)

diff --git a/tools/testing/selftests/x86/sgx/main.c b/tools/testing/selftests/x86/sgx/main.c
index e2265f841fb0..234cfbad14a5 100644
--- a/tools/testing/selftests/x86/sgx/main.c
+++ b/tools/testing/selftests/x86/sgx/main.c
@@ -9,6 +9,7 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+#include <errno.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
@@ -18,6 +19,10 @@
#include "../../../../../arch/x86/kernel/cpu/sgx/arch.h"
#include "../../../../../arch/x86/include/uapi/asm/sgx.h"

+#define _Q(x) __Q(x)
+#define __Q(x) #x
+#define ERRLN "Line " _Q(__LINE__)
+
static const uint64_t MAGIC = 0x1122334455667788ULL;

struct vdso_symtab {
@@ -138,7 +143,7 @@ static bool encl_create(int dev_fd, unsigned long bin_size,
base = mmap(NULL, secs->size, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_SHARED, dev_fd, 0);
if (base == MAP_FAILED) {
- perror("mmap");
+ perror(ERRLN);
return false;
}

@@ -224,24 +229,113 @@ static bool encl_load(struct sgx_secs *secs, unsigned long bin_size)
return false;
}

-void sgx_call(void *rdi, void *rsi, void *tcs,
- struct sgx_enclave_exception *exception,
- void *eenter);
+int sgx_call(void *rdi, void *rsi, long rdx, void *rcx, void *r8, void *r9,
+ void *tcs, struct sgx_enclave_exinfo *ei, void *cb, void *eenter);
+
+static void show_enclave_exinfo(const struct sgx_enclave_exinfo *exinfop,
+ const char *header)
+{
+ printf("%s: leaf:%d", header, exinfop->leaf);
+ if (exinfop->leaf != 4)
+ printf(" trap#:%d ec:%d addr:0x%llx\n", exinfop->trapnr,
+ exinfop->error_code, exinfop->address);
+ else printf("\n");
+}
+
+static void test1(void *eenter, struct sgx_secs *secs)
+{
+ uint64_t result = 0;
+ struct sgx_enclave_exinfo exinfo;
+
+ printf("[1] Entering the enclave without callback.\n");
+
+ printf("Input: 0x%lx\n Expect: Same as input\n", MAGIC);
+ sgx_call((void *)&MAGIC, &result, 0, NULL, NULL, NULL,
+ (void *)secs->base, &exinfo, NULL, eenter);
+ if (result != MAGIC) {
+ fprintf(stderr, "0x%lx != 0x%lx\n", result, MAGIC);
+ exit(1);
+ }
+ printf(" Output: 0x%lx\n", result);
+
+ printf("Input: Null TCS\n Expect: #PF at EENTER\n");
+ sgx_call((void *)&MAGIC, &result, 0, NULL, NULL, NULL,
+ NULL, &exinfo, NULL, eenter);
+ show_enclave_exinfo(&exinfo, " Exit");
+ if (exinfo.leaf != 2 /*EENTER*/ || exinfo.trapnr != 14 /*#PF*/)
+ exit(1);
+}
+
+static int enclave_ex_callback(long rdi, long rsi, long rdx,
+ struct sgx_enclave_exinfo *ei, long r8, long r9, void *tcs, long ursp)
+{
+ show_enclave_exinfo(ei, " callback");
+
+ switch (ei->leaf)
+ {
+ case 4:
+ return 0;
+ case 3:
+ case 2:
+ if (ei->trapnr != 14 /*#PF*/ || (ei->error_code & 1) == 0) {
+ fprintf(stderr, ERRLN ": Unexpected exception\n");
+ exit(1);
+ }
+
+ if (mprotect((void*)(ei->address & -0x1000), 0x1000,
+ ((ei->error_code & 2) ? PROT_WRITE : 0) |
+ ((ei->error_code & 0x10) ? PROT_EXEC : 0) |
+ PROT_READ)) {
+ perror(ERRLN);
+ exit(1);
+ }
+
+ return ei->leaf == 2 ? -EAGAIN : ei->leaf;
+ }
+ return -EINVAL;
+}
+
+static void test2(void *eenter, struct sgx_secs *secs)
+{
+ uint64_t result = 0;
+ struct sgx_enclave_exinfo exinfo;
+
+ printf("[2] Entering the enclave with callback.\n");
+
+ printf("Input: 0x%lx\n Expect: Same as input\n", MAGIC);
+ sgx_call((void *)&MAGIC, &result, 0, NULL, NULL, NULL,
+ (void *)secs->base, &exinfo, enclave_ex_callback, eenter);
+ if (result != MAGIC) {
+ fprintf(stderr, "0x%lx != 0x%lx\n", result, MAGIC);
+ exit(1);
+ }
+ printf(" Output: 0x%lx\n", result);
+
+ printf("Input: Read-only enclave (0x%lx-0x%lx)\n"
+ " Expect: #PFs to be fixed by callback\n",
+ secs->base, secs->base + (encl_bin_end - encl_bin) - 1);
+ if (mprotect((void*)secs->base, encl_bin_end - encl_bin, PROT_READ)) {
+ perror(ERRLN);
+ exit(1);
+ }
+ while (sgx_call((void *)&MAGIC, &result, 0, NULL, NULL, NULL,
+ (void*)secs->base, &exinfo, enclave_ex_callback,
+ eenter) == -EAGAIN);
+ show_enclave_exinfo(&exinfo, " Exit");
+ if (exinfo.leaf != 4 /*EEXIT*/)
+ exit(1);
+}

int main(int argc, char *argv[], char *envp[])
{
unsigned long bin_size = encl_bin_end - encl_bin;
unsigned long ss_size = encl_ss_end - encl_ss;
- struct sgx_enclave_exception exception;
Elf64_Sym *eenter_sym;
struct vdso_symtab symtab;
struct sgx_secs secs;
- uint64_t result = 0;
void *eenter;
void *addr;

- memset(&exception, 0, sizeof(exception));
-
addr = vdso_get_base_addr(envp);
if (!addr)
exit(1);
@@ -266,14 +360,7 @@ int main(int argc, char *argv[], char *envp[])
if (!encl_load(&secs, bin_size))
exit(1);

- printf("Input: 0x%lx\n", MAGIC);
- sgx_call((void *)&MAGIC, &result, (void *)secs.base, &exception,
- eenter);
- if (result != MAGIC) {
- fprintf(stderr, "0x%lx != 0x%lx\n", result, MAGIC);
- exit(1);
- }
-
- printf("Output: 0x%lx\n", result);
- exit(0);
+ test1(eenter, &secs);
+ test2(eenter, &secs);
+ return 0;
}
diff --git a/tools/testing/selftests/x86/sgx/sgx_call.S b/tools/testing/selftests/x86/sgx/sgx_call.S
index 14bd0a044199..da8f687a60d2 100644
--- a/tools/testing/selftests/x86/sgx/sgx_call.S
+++ b/tools/testing/selftests/x86/sgx/sgx_call.S
@@ -7,9 +7,43 @@

.global sgx_call
sgx_call:
+ .cfi_startproc
+ push %r15
+ .cfi_adjust_cfa_offset 8
+ .cfi_rel_offset %r15, 0
+ push %r14
+ .cfi_adjust_cfa_offset 8
+ .cfi_rel_offset %r14, 0
+ push %r13
+ .cfi_adjust_cfa_offset 8
+ .cfi_rel_offset %r13, 0
+ push %r12
+ .cfi_adjust_cfa_offset 8
+ .cfi_rel_offset %r12, 0
push %rbx
- mov $0x02, %rax
- mov %rdx, %rbx
- call *%r8
+ .cfi_adjust_cfa_offset 8
+ .cfi_rel_offset %rbx, 0
+ push $0
+ .cfi_adjust_cfa_offset 8
+ push 0x48(%rsp)
+ .cfi_adjust_cfa_offset 8
+ push 0x48(%rsp)
+ .cfi_adjust_cfa_offset 8
+ push 0x48(%rsp)
+ .cfi_adjust_cfa_offset 8
+ mov $2, %eax
+ call *0x68(%rsp)
+ add $0x20, %rsp
+ .cfi_adjust_cfa_offset -0x20
pop %rbx
+ .cfi_adjust_cfa_offset -8
+ pop %r12
+ .cfi_adjust_cfa_offset -8
+ pop %r13
+ .cfi_adjust_cfa_offset -8
+ pop %r14
+ .cfi_adjust_cfa_offset -8
+ pop %r15
+ .cfi_adjust_cfa_offset -8
ret
+ .cfi_endproc
--
2.17.1
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