[PATCH 3/4] selftests/sgx: Assign source for each segment

Jarkko Sakkinen
2021-07-05T14:37:07Z

Define source per segment so that enclave pages can be added from different
sources, e.g. anonymous VMA for zero pages. In other words, add 'src' field
to struct encl_segment, and assign it to 'encl->src' for pages inherited
from the enclave binary.

Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
---
tools/testing/selftests/sgx/load.c | 5 +++--
tools/testing/selftests/sgx/main.h | 1 +
tools/testing/selftests/sgx/sigstruct.c | 8 ++++----
3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/sgx/load.c b/tools/testing/selftests/sgx/load.c
index 00928be57fc4..9946fab2a3d6 100644
--- a/tools/testing/selftests/sgx/load.c
+++ b/tools/testing/selftests/sgx/load.c
@@ -107,7 +107,7 @@ static bool encl_ioc_add_pages(struct encl *encl, struct encl_segment *seg)
memset(&secinfo, 0, sizeof(secinfo));
secinfo.flags = seg->flags;

- ioc.src = (uint64_t)encl->src + seg->offset;
+ ioc.src = (uint64_t)seg->src;
ioc.offset = seg->offset;
ioc.length = seg->size;
ioc.secinfo = (unsigned long)&secinfo;
@@ -226,6 +226,7 @@ bool encl_load(const char *path, struct encl *encl)

if (j == 0) {
src_offset = phdr->p_offset & PAGE_MASK;
+ encl->src = encl->bin + src_offset;

seg->prot = PROT_READ | PROT_WRITE;
seg->flags = SGX_PAGE_TYPE_TCS << 8;
@@ -238,13 +239,13 @@ bool encl_load(const char *path, struct encl *encl)

seg->offset = (phdr->p_offset & PAGE_MASK) - src_offset;
seg->size = (phdr->p_filesz + PAGE_SIZE - 1) & PAGE_MASK;
+ seg->src = encl->src + seg->offset;

j++;
}

assert(j == encl->nr_segments);

- encl->src = encl->bin + src_offset;
encl->src_size = encl->segment_tbl[j - 1].offset +
encl->segment_tbl[j - 1].size;

diff --git a/tools/testing/selftests/sgx/main.h b/tools/testing/selftests/sgx/main.h
index 68672fd86cf9..452d11dc4889 100644
--- a/tools/testing/selftests/sgx/main.h
+++ b/tools/testing/selftests/sgx/main.h
@@ -7,6 +7,7 @@
#define MAIN_H

struct encl_segment {
+ void *src;
off_t offset;
size_t size;
unsigned int prot;
diff --git a/tools/testing/selftests/sgx/sigstruct.c b/tools/testing/selftests/sgx/sigstruct.c
index 92bbc5a15c39..202a96fd81bf 100644
--- a/tools/testing/selftests/sgx/sigstruct.c
+++ b/tools/testing/selftests/sgx/sigstruct.c
@@ -289,14 +289,14 @@ static bool mrenclave_eextend(EVP_MD_CTX *ctx, uint64_t offset,
static bool mrenclave_segment(EVP_MD_CTX *ctx, struct encl *encl,
struct encl_segment *seg)
{
- uint64_t end = seg->offset + seg->size;
+ uint64_t end = seg->size;
uint64_t offset;

- for (offset = seg->offset; offset < end; offset += PAGE_SIZE) {
- if (!mrenclave_eadd(ctx, offset, seg->flags))
+ for (offset = 0; offset < end; offset += PAGE_SIZE) {
+ if (!mrenclave_eadd(ctx, seg->offset + offset, seg->flags))
return false;

- if (!mrenclave_eextend(ctx, offset, encl->src + offset))
+ if (!mrenclave_eextend(ctx, seg->offset + offset, seg->src + offset))
return false;
}

--
2.32.0