The goal of these patches is to add a test case for a SGX reserved memory oversubscription, i.e. make sure that the page reclaimer and and the page fault handler are working correctly.
Change Log ==========
v3: * Reorganized the patch set into smaller pieces, and refactored the code so that the test enclave can be created inside each test case. Added a new test case unclobbered_vdso_oversubscribed that creates a large enough heap to fill all of the available SGX reserved memory (EPC).
Jarkko Sakkinen (8): x86/sgx: Add /sys/kernel/debug/x86/sgx_total_mem selftests/sgx: Assign source for each segment selftests/sgx: Make data measurement for an enclave segment optional selftests/sgx: Create a heap for the test enclave selftests/sgx: Dump segments and /proc/self/maps only on failure selftests/sgx: Encpsulate the test enclave creation selftests/sgx: Move setup_test_encl() to each TEST_F() selftests/sgx: Add a new kselftest: unclobbered_vdso_oversubscribed
Documentation/x86/sgx.rst | 6 ++ arch/x86/kernel/cpu/sgx/main.c | 10 +- tools/testing/selftests/sgx/load.c | 40 ++++++-- tools/testing/selftests/sgx/main.c | 129 ++++++++++++++++++++---- tools/testing/selftests/sgx/main.h | 7 +- tools/testing/selftests/sgx/sigstruct.c | 12 ++- 6 files changed, 165 insertions(+), 39 deletions(-)
Just like normal memory, SGX memory can be overcommitted. SGX has its own reclaim mechanism which kicks in when physical SGX memory (Enclave Page Cache / EPC) is exhausted. That reclaim mechanism is relatively rarely exercised and needs selftests to poke at it.
The amount of EPC on the system is determined by the BIOS and it varies wildly between systems. It can be dozens of MB on desktops, or many GB on servers.
To run in a reasonable amount of time, the selftest needs to know how much EPC there is in the system.
Introduce a new debugfs file to export that information.
Acked-by: Dave Hansen dave.hansen@linux.intel.com Signed-off-by: Jarkko Sakkinen jarkko@kernel.org
v3: * Describe the units of sgx_total_mem in Dcumentation/x86/sgx.rst. * Rewrite of the commit message (suggested by Dave): https://lore.kernel.org/linux-sgx/5d3614af-2393-6744-9d85-7001241ca76e@intel...
v2: * sgx_nr_all_pages -> sgx_total_mem --- Documentation/x86/sgx.rst | 6 ++++++ arch/x86/kernel/cpu/sgx/main.c | 10 +++++++++- 2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/Documentation/x86/sgx.rst b/Documentation/x86/sgx.rst index dd0ac96ff9ef..f11bfb331b93 100644 --- a/Documentation/x86/sgx.rst +++ b/Documentation/x86/sgx.rst @@ -250,3 +250,9 @@ user wants to deploy SGX applications both on the host and in guests on the same machine, the user should reserve enough EPC (by taking out total virtual EPC size of all SGX VMs from the physical EPC size) for host SGX applications so they can run with acceptable performance. + +Debugging +========= + +*/sys/kernel/debug/x86/sgx_total_mem* contains an integer describing +the total SGX reserved memory in bytes, available in the system. diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c index 63d3de02bbcc..b65da19a53ee 100644 --- a/arch/x86/kernel/cpu/sgx/main.c +++ b/arch/x86/kernel/cpu/sgx/main.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright(c) 2016-20 Intel Corporation. */
+#include <linux/debugfs.h> #include <linux/file.h> #include <linux/freezer.h> #include <linux/highmem.h> @@ -28,7 +29,10 @@ static DECLARE_WAIT_QUEUE_HEAD(ksgxd_waitq); static LIST_HEAD(sgx_active_page_list); static DEFINE_SPINLOCK(sgx_reclaimer_lock);
-/* The free page list lock protected variables prepend the lock. */ +/* Total EPC memory available in bytes. */ +static unsigned long sgx_total_mem; + +/* The number of free EPC pages in all nodes. */ static unsigned long sgx_nr_free_pages;
/* Nodes with one or more EPC sections. */ @@ -656,6 +660,8 @@ static bool __init sgx_setup_epc_section(u64 phys_addr, u64 size, list_add_tail(§ion->pages[i].list, &sgx_dirty_page_list); }
+ sgx_total_mem += nr_pages * PAGE_SIZE; + return true; }
@@ -823,6 +829,8 @@ static int __init sgx_init(void) if (sgx_vepc_init() && ret) goto err_provision;
+ debugfs_create_ulong("sgx_total_mem", 0444, arch_debugfs_dir, &sgx_total_mem); + return 0;
err_provision:
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 3ebe5d1fe337..5605474aab73 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; @@ -216,6 +216,7 @@ 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; @@ -228,13 +229,13 @@ 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; }
For a heap makes sense to leave its contents "unmeasured" in the SGX enclave build process, meaning that they won't contribute to the cryptographic signature (a RSA-3072 signed SHA56 hash) of the enclave.
Enclaves are signed blobs where the signature is calculated both from page data and also from "structural properties" of the pages. For instance a page offset of *every* page added to the enclave is hashed.
For data, this is optional, not least because hashing a page has a significant contribution to the enclave load time. Thus, where there is no reason to hash, do not. The SGX ioctl interface supports this with SGX_PAGE_MEASURE flag. Only when the flag is *set*, data is measured.
Add seg->measure boolean flag to struct encl_segment. Only when the flag is set, include the segment data to the signature (represented by SIGSTRUCT architectural structure).
Signed-off-by: Jarkko Sakkinen jarkko@kernel.org --- tools/testing/selftests/sgx/load.c | 6 +++++- tools/testing/selftests/sgx/main.h | 1 + tools/testing/selftests/sgx/sigstruct.c | 6 ++++-- 3 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/sgx/load.c b/tools/testing/selftests/sgx/load.c index 5605474aab73..f1be78984c50 100644 --- a/tools/testing/selftests/sgx/load.c +++ b/tools/testing/selftests/sgx/load.c @@ -111,7 +111,10 @@ static bool encl_ioc_add_pages(struct encl *encl, struct encl_segment *seg) ioc.offset = seg->offset; ioc.length = seg->size; ioc.secinfo = (unsigned long)&secinfo; - ioc.flags = SGX_PAGE_MEASURE; + if (seg->measure) + ioc.flags = SGX_PAGE_MEASURE; + else + ioc.flags = 0;
rc = ioctl(encl->fd, SGX_IOC_ENCLAVE_ADD_PAGES, &ioc); if (rc < 0) { @@ -230,6 +233,7 @@ 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; + seg->measure = true;
j++; } diff --git a/tools/testing/selftests/sgx/main.h b/tools/testing/selftests/sgx/main.h index 452d11dc4889..aebc69e7cdc8 100644 --- a/tools/testing/selftests/sgx/main.h +++ b/tools/testing/selftests/sgx/main.h @@ -12,6 +12,7 @@ struct encl_segment { size_t size; unsigned int prot; unsigned int flags; + bool measure; };
struct encl { diff --git a/tools/testing/selftests/sgx/sigstruct.c b/tools/testing/selftests/sgx/sigstruct.c index 202a96fd81bf..50c5ab1aa6fa 100644 --- a/tools/testing/selftests/sgx/sigstruct.c +++ b/tools/testing/selftests/sgx/sigstruct.c @@ -296,8 +296,10 @@ static bool mrenclave_segment(EVP_MD_CTX *ctx, struct encl *encl, if (!mrenclave_eadd(ctx, seg->offset + offset, seg->flags)) return false;
- if (!mrenclave_eextend(ctx, seg->offset + offset, seg->src + offset)) - return false; + if (seg->measure) { + if (!mrenclave_eextend(ctx, seg->offset + offset, seg->src + offset)) + return false; + } }
return true;
Create a heap for the test enclave, which is allocated from /dev/null, and left unmeasured. This is beneficial by its own because it verifies that an enclave built from multiple choices, works properly. If LSM hooks are added for SGX some day, a multi source enclave has higher probability to trigger bugs on access control checks.
The immediate need comes from the need to implement page reclaim tests. In order to trigger the page reclaimer, one can just set the size of the heap to high enough.
Signed-off-by: Jarkko Sakkinen jarkko@kernel.org --- tools/testing/selftests/sgx/load.c | 29 ++++++++++++++++++++++------- tools/testing/selftests/sgx/main.c | 2 +- tools/testing/selftests/sgx/main.h | 4 +++- 3 files changed, 26 insertions(+), 9 deletions(-)
diff --git a/tools/testing/selftests/sgx/load.c b/tools/testing/selftests/sgx/load.c index f1be78984c50..9d4322c946e2 100644 --- a/tools/testing/selftests/sgx/load.c +++ b/tools/testing/selftests/sgx/load.c @@ -21,6 +21,8 @@
void encl_delete(struct encl *encl) { + struct encl_segment *heap_seg = &encl->segment_tbl[encl->nr_segments - 1]; + if (encl->encl_base) munmap((void *)encl->encl_base, encl->encl_size);
@@ -30,6 +32,8 @@ void encl_delete(struct encl *encl) if (encl->fd) close(encl->fd);
+ munmap(heap_seg->src, heap_seg->size); + if (encl->segment_tbl) free(encl->segment_tbl);
@@ -125,11 +129,10 @@ static bool encl_ioc_add_pages(struct encl *encl, struct encl_segment *seg) return true; }
- - -bool encl_load(const char *path, struct encl *encl) +bool encl_load(const char *path, struct encl *encl, unsigned long heap_size) { const char device_path[] = "/dev/sgx_enclave"; + struct encl_segment *seg; Elf64_Phdr *phdr_tbl; off_t src_offset; Elf64_Ehdr *ehdr; @@ -181,6 +184,8 @@ bool encl_load(const char *path, struct encl *encl) ehdr = encl->bin; phdr_tbl = encl->bin + ehdr->e_phoff;
+ encl->nr_segments = 1; /* one for the heap */ + for (i = 0; i < ehdr->e_phnum; i++) { Elf64_Phdr *phdr = &phdr_tbl[i];
@@ -196,7 +201,6 @@ bool encl_load(const char *path, struct encl *encl) for (i = 0, j = 0; i < ehdr->e_phnum; i++) { Elf64_Phdr *phdr = &phdr_tbl[i]; unsigned int flags = phdr->p_flags; - struct encl_segment *seg;
if (phdr->p_type != PT_LOAD) continue; @@ -238,10 +242,21 @@ bool encl_load(const char *path, struct encl *encl) j++; }
- assert(j == encl->nr_segments); + assert(j == encl->nr_segments - 1); + + seg = &encl->segment_tbl[j]; + seg->offset = encl->segment_tbl[j - 1].offset + encl->segment_tbl[j - 1].size; + seg->size = heap_size; + seg->src = mmap(NULL, heap_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + seg->prot = PROT_READ | PROT_WRITE; + seg->flags = (SGX_PAGE_TYPE_REG << 8) | seg->prot; + seg->measure = false; + + if (seg->src == MAP_FAILED) + goto err;
- encl->src_size = encl->segment_tbl[j - 1].offset + - encl->segment_tbl[j - 1].size; + encl->src_size = encl->segment_tbl[j].offset + encl->segment_tbl[j].size;
for (encl->encl_size = 4096; encl->encl_size < encl->src_size; ) encl->encl_size <<= 1; diff --git a/tools/testing/selftests/sgx/main.c b/tools/testing/selftests/sgx/main.c index e252015e0c15..6858a35fed20 100644 --- a/tools/testing/selftests/sgx/main.c +++ b/tools/testing/selftests/sgx/main.c @@ -122,7 +122,7 @@ FIXTURE_SETUP(enclave) unsigned int i; void *addr;
- if (!encl_load("test_encl.elf", &self->encl)) { + if (!encl_load("test_encl.elf", &self->encl, ENCL_HEAP_SIZE_DEFAULT)) { encl_delete(&self->encl); ksft_exit_skip("cannot load enclaves\n"); } diff --git a/tools/testing/selftests/sgx/main.h b/tools/testing/selftests/sgx/main.h index aebc69e7cdc8..b45c52ec7ab3 100644 --- a/tools/testing/selftests/sgx/main.h +++ b/tools/testing/selftests/sgx/main.h @@ -6,6 +6,8 @@ #ifndef MAIN_H #define MAIN_H
+#define ENCL_HEAP_SIZE_DEFAULT 4096 + struct encl_segment { void *src; off_t offset; @@ -33,7 +35,7 @@ extern unsigned char sign_key[]; extern unsigned char sign_key_end[];
void encl_delete(struct encl *ctx); -bool encl_load(const char *path, struct encl *encl); +bool encl_load(const char *path, struct encl *encl, unsigned long heap_size); bool encl_measure(struct encl *encl); bool encl_build(struct encl *encl);
Logging is always a compromise between clarity and detail. The main use case for dumping VMA's is when FIXTURE_SETUP() fails, and is less important for enclaves that do initialize correctly. Therefore, print the segments and /proc/self/maps only in the error case.
Finally, if a single test ever creates multiple enclaves, the amount of log lines would become enormous.
Signed-off-by: Jarkko Sakkinen jarkko@kernel.org --- tools/testing/selftests/sgx/main.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-)
diff --git a/tools/testing/selftests/sgx/main.c b/tools/testing/selftests/sgx/main.c index 6858a35fed20..deab02f2f3ce 100644 --- a/tools/testing/selftests/sgx/main.c +++ b/tools/testing/selftests/sgx/main.c @@ -127,12 +127,6 @@ FIXTURE_SETUP(enclave) ksft_exit_skip("cannot load enclaves\n"); }
- for (i = 0; i < self->encl.nr_segments; i++) { - seg = &self->encl.segment_tbl[i]; - - TH_LOG("0x%016lx 0x%016lx 0x%02x", seg->offset, seg->size, seg->prot); - } - if (!encl_measure(&self->encl)) goto err;
@@ -169,6 +163,17 @@ FIXTURE_SETUP(enclave) memset(&self->run, 0, sizeof(self->run)); self->run.tcs = self->encl.encl_base;
+ return; + +err: + encl_delete(&self->encl); + + for (i = 0; i < self->encl.nr_segments; i++) { + seg = &self->encl.segment_tbl[i]; + + TH_LOG("0x%016lx 0x%016lx 0x%02x", seg->offset, seg->size, seg->prot); + } + maps_file = fopen("/proc/self/maps", "r"); if (maps_file != NULL) { while (fgets(maps_line, sizeof(maps_line), maps_file) != NULL) { @@ -181,11 +186,7 @@ FIXTURE_SETUP(enclave) fclose(maps_file); }
-err: - if (!sgx_enter_enclave_sym) - encl_delete(&self->encl); - - ASSERT_NE(sgx_enter_enclave_sym, NULL); + ASSERT_TRUE(false); }
FIXTURE_TEARDOWN(enclave)
Having a helper function to build the test enclave is important for couple of reasons:
1. Allows to parametrize the heap size for different tests. 3. Allows to easily create multiple enclaves.
Introduce setup_test_encl() for this purpose.
Signed-off-by: Jarkko Sakkinen jarkko@kernel.org --- tools/testing/selftests/sgx/main.c | 45 ++++++++++++++++++------------ 1 file changed, 27 insertions(+), 18 deletions(-)
diff --git a/tools/testing/selftests/sgx/main.c b/tools/testing/selftests/sgx/main.c index deab02f2f3ce..4fbe9856f775 100644 --- a/tools/testing/selftests/sgx/main.c +++ b/tools/testing/selftests/sgx/main.c @@ -112,7 +112,8 @@ FIXTURE(enclave) { struct sgx_enclave_run run; };
-FIXTURE_SETUP(enclave) +static bool setup_test_encl(unsigned long heap_size, struct encl *encl, + struct __test_metadata *_metadata) { Elf64_Sym *sgx_enter_enclave_sym = NULL; struct vdso_symtab symtab; @@ -122,25 +123,25 @@ FIXTURE_SETUP(enclave) unsigned int i; void *addr;
- if (!encl_load("test_encl.elf", &self->encl, ENCL_HEAP_SIZE_DEFAULT)) { - encl_delete(&self->encl); - ksft_exit_skip("cannot load enclaves\n"); + if (!encl_load("test_encl.elf", encl, heap_size)) { + encl_delete(encl); + TH_LOG("Failed to load the test enclave.\n"); }
- if (!encl_measure(&self->encl)) + if (!encl_measure(encl)) goto err;
- if (!encl_build(&self->encl)) + if (!encl_build(encl)) goto err;
/* * An enclave consumer only must do this. */ - for (i = 0; i < self->encl.nr_segments; i++) { - struct encl_segment *seg = &self->encl.segment_tbl[i]; + for (i = 0; i < encl->nr_segments; i++) { + struct encl_segment *seg = &encl->segment_tbl[i];
- addr = mmap((void *)self->encl.encl_base + seg->offset, seg->size, - seg->prot, MAP_SHARED | MAP_FIXED, self->encl.fd, 0); + addr = mmap((void *)encl->encl_base + seg->offset, seg->size, + seg->prot, MAP_SHARED | MAP_FIXED, encl->fd, 0); EXPECT_NE(addr, MAP_FAILED); if (addr == MAP_FAILED) goto err; @@ -160,16 +161,13 @@ FIXTURE_SETUP(enclave)
vdso_sgx_enter_enclave = addr + sgx_enter_enclave_sym->st_value;
- memset(&self->run, 0, sizeof(self->run)); - self->run.tcs = self->encl.encl_base; - - return; + return true;
err: - encl_delete(&self->encl); + encl_delete(encl);
- for (i = 0; i < self->encl.nr_segments; i++) { - seg = &self->encl.segment_tbl[i]; + for (i = 0; i < encl->nr_segments; i++) { + seg = &encl->segment_tbl[i];
TH_LOG("0x%016lx 0x%016lx 0x%02x", seg->offset, seg->size, seg->prot); } @@ -186,7 +184,18 @@ FIXTURE_SETUP(enclave) fclose(maps_file); }
- ASSERT_TRUE(false); + TH_LOG("Failed to initialize the test enclave.\n"); + + return false; +} + +FIXTURE_SETUP(enclave) +{ + if (!setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)) + ASSERT_TRUE(false); + + memset(&self->run, 0, sizeof(self->run)); + self->run.tcs = self->encl.encl_base; }
FIXTURE_TEARDOWN(enclave)
On Fri, Aug 06, 2021 at 03:17:02AM +0300, Jarkko Sakkinen wrote:
+FIXTURE_SETUP(enclave) +{
- if (!setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata))
ASSERT_TRUE(false);
Probably would make more sense:
ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata));
Right?
[and similar remarks to 7/8 and 8/8]
/Jarkko
Create the test enclave inside each TEST_F(), instead of FIXTURE_SETUP(), so that the heap size can be defined per test.
Signed-off-by: Jarkko Sakkinen jarkko@kernel.org --- tools/testing/selftests/sgx/main.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-)
diff --git a/tools/testing/selftests/sgx/main.c b/tools/testing/selftests/sgx/main.c index 4fbe9856f775..f219768b4e9a 100644 --- a/tools/testing/selftests/sgx/main.c +++ b/tools/testing/selftests/sgx/main.c @@ -191,11 +191,6 @@ static bool setup_test_encl(unsigned long heap_size, struct encl *encl,
FIXTURE_SETUP(enclave) { - if (!setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)) - ASSERT_TRUE(false); - - memset(&self->run, 0, sizeof(self->run)); - self->run.tcs = self->encl.encl_base; }
FIXTURE_TEARDOWN(enclave) @@ -227,6 +222,12 @@ TEST_F(enclave, unclobbered_vdso) { struct encl_op op;
+ if (!setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)) + ASSERT_TRUE(false); + + memset(&self->run, 0, sizeof(self->run)); + self->run.tcs = self->encl.encl_base; + op.type = ENCL_OP_PUT; op.buffer = MAGIC;
@@ -249,6 +250,12 @@ TEST_F(enclave, clobbered_vdso) { struct encl_op op;
+ if (!setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)) + ASSERT_TRUE(false); + + memset(&self->run, 0, sizeof(self->run)); + self->run.tcs = self->encl.encl_base; + op.type = ENCL_OP_PUT; op.buffer = MAGIC;
@@ -279,6 +286,12 @@ TEST_F(enclave, clobbered_vdso_and_user_function) { struct encl_op op;
+ if (!setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)) + ASSERT_TRUE(false); + + memset(&self->run, 0, sizeof(self->run)); + self->run.tcs = self->encl.encl_base; + self->run.user_handler = (__u64)test_handler; self->run.user_data = 0xdeadbeef;
Add a variation of the unclobbered_vdso test.
In the new test, create a heap for the test enclave, which has the same size as all available Enclave Page Cache (EPC) pages in the system. This will guarantee that all test_encl.elf pages *and* SGX Enclave Control Structure (SECS) have been swapped out by the page reclaimer during the load time..
This test will trigger both the page reclaimer and the page fault handler. The page reclaimer triggered, while the heap is being created during the load time. The page fault handler is triggered for all the required pages, while the test case is executing.
Signed-off-by: Jarkko Sakkinen jarkko@kernel.org --- tools/testing/selftests/sgx/main.c | 62 ++++++++++++++++++++++++++++++ tools/testing/selftests/sgx/main.h | 1 + 2 files changed, 63 insertions(+)
diff --git a/tools/testing/selftests/sgx/main.c b/tools/testing/selftests/sgx/main.c index f219768b4e9a..3be34c3db74a 100644 --- a/tools/testing/selftests/sgx/main.c +++ b/tools/testing/selftests/sgx/main.c @@ -246,6 +246,68 @@ TEST_F(enclave, unclobbered_vdso) EXPECT_EQ(self->run.user_data, 0); }
+static bool sysfs_get_ulong(const char *path, unsigned long *value) +{ + struct stat sbuf; + char buf[128]; + ssize_t ret; + int fd; + + ret = stat(path, &sbuf); + if (ret) + return false; + + fd = open(path, O_RDONLY); + if (fd < 0) + return false; + + ret = read(fd, buf, sizeof(buf)); + if (ret < 0) { + close(fd); + return false; + } + + errno = 0; + *value = strtoul(buf, NULL, 0); + + close(fd); + + return errno ? false : true; +} + +TEST_F(enclave, unclobbered_vdso_oversubscribed) +{ + unsigned long total_mem; + struct encl_op op; + + if (!sysfs_get_ulong(SGX_TOTAL_MEM_PATH, &total_mem)) + ASSERT_TRUE(false); + + if (!setup_test_encl(total_mem, &self->encl, _metadata)) + ASSERT_TRUE(false); + + memset(&self->run, 0, sizeof(self->run)); + self->run.tcs = self->encl.encl_base; + + op.type = ENCL_OP_PUT; + op.buffer = MAGIC; + + EXPECT_EQ(ENCL_CALL(&op, &self->run, false), 0); + + EXPECT_EEXIT(&self->run); + EXPECT_EQ(self->run.user_data, 0); + + op.type = ENCL_OP_GET; + op.buffer = 0; + + EXPECT_EQ(ENCL_CALL(&op, &self->run, false), 0); + + EXPECT_EQ(op.buffer, MAGIC); + EXPECT_EEXIT(&self->run); + EXPECT_EQ(self->run.user_data, 0); + +} + TEST_F(enclave, clobbered_vdso) { struct encl_op op; diff --git a/tools/testing/selftests/sgx/main.h b/tools/testing/selftests/sgx/main.h index b45c52ec7ab3..dd7767364107 100644 --- a/tools/testing/selftests/sgx/main.h +++ b/tools/testing/selftests/sgx/main.h @@ -7,6 +7,7 @@ #define MAIN_H
#define ENCL_HEAP_SIZE_DEFAULT 4096 +#define SGX_TOTAL_MEM_PATH "/sys/kernel/debug/x86/sgx_total_mem"
struct encl_segment { void *src;
linux-kselftest-mirror@lists.linaro.org
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Jarkko Sakkinen