| // Copyright 2016 The Fuchsia Authors |
| // |
| // Use of this source code is governed by a MIT-style |
| // license that can be found in the LICENSE file or at |
| // https://opensource.org/licenses/MIT |
| |
| #include <arch/aspace.h> |
| #include <arch/mmu.h> |
| #include <bits.h> |
| #include <err.h> |
| #include <lib/unittest/unittest.h> |
| #include <vm/arch_vm_aspace.h> |
| #include <vm/pmm.h> |
| #include <zircon/types.h> |
| |
| #ifdef __x86_64__ |
| #include <arch/x86/mmu.h> |
| #define PGTABLE_L1_SHIFT PDP_SHIFT |
| #define PGTABLE_L2_SHIFT PD_SHIFT |
| #else |
| #define PGTABLE_L1_SHIFT MMU_LX_X(MMU_KERNEL_PAGE_SIZE_SHIFT, 1) |
| #define PGTABLE_L2_SHIFT MMU_LX_X(MMU_KERNEL_PAGE_SIZE_SHIFT, 2) |
| #endif |
| |
| static bool test_large_unaligned_region() { |
| BEGIN_TEST; |
| unittest_printf("creating large un-aligned vm region, and unmap it without mapping, make sure no leak (ZX-315)\n"); |
| ArchVmAspace aspace; |
| vaddr_t base = 1UL << 20; |
| size_t size = (1UL << 47) - base - (1UL << 20); |
| zx_status_t err = aspace.Init(1UL << 20, size, 0); |
| EXPECT_EQ(err, ZX_OK, "init aspace"); |
| |
| const uint arch_rw_flags = ARCH_MMU_FLAG_PERM_READ | ARCH_MMU_FLAG_PERM_WRITE; |
| |
| // We want our region to be misaligned by at least a page, and for |
| // it to straddle the PDP. |
| vaddr_t va = (1UL << PGTABLE_L1_SHIFT) - (1UL << PGTABLE_L2_SHIFT) + 2 * PAGE_SIZE; |
| // Make sure alloc_size is less than 1 PD page, to exercise the |
| // non-terminal code path. |
| static const size_t alloc_size = (1UL << PGTABLE_L2_SHIFT) - PAGE_SIZE; |
| |
| // Map a single page to force the lower PDP of the target region |
| // to be created |
| size_t mapped; |
| err = aspace.MapContiguous(va - 3 * PAGE_SIZE, 0, 1, arch_rw_flags, &mapped); |
| EXPECT_EQ(err, ZX_OK, "map single page"); |
| EXPECT_EQ(mapped, 1u, "map single page"); |
| |
| // Map the last page of the region |
| err = aspace.MapContiguous(va + alloc_size - PAGE_SIZE, 0, 1, arch_rw_flags, &mapped); |
| EXPECT_EQ(err, ZX_OK, "map last page"); |
| EXPECT_EQ(mapped, 1u, "map single page"); |
| |
| paddr_t pa; |
| uint flags; |
| err = aspace.Query(va + alloc_size - PAGE_SIZE, &pa, &flags); |
| EXPECT_EQ(err, ZX_OK, "last entry is mapped"); |
| |
| // Attempt to unmap the target region (analogous to unmapping a demand |
| // paged region that has only had its last page touched) |
| size_t unmapped; |
| err = aspace.Unmap(va, alloc_size / PAGE_SIZE, &unmapped); |
| EXPECT_EQ(err, ZX_OK, "unmap unallocated region"); |
| EXPECT_EQ(unmapped, alloc_size / PAGE_SIZE, "unmap unallocated region"); |
| |
| err = aspace.Query(va + alloc_size - PAGE_SIZE, &pa, &flags); |
| EXPECT_EQ(err, ZX_ERR_NOT_FOUND, "last entry is not mapped anymore"); |
| |
| // Unmap the single page from earlier |
| err = aspace.Unmap(va - 3 * PAGE_SIZE, 1, &unmapped); |
| EXPECT_EQ(err, ZX_OK, "unmap single page"); |
| EXPECT_EQ(unmapped, 1u, "unmap unallocated region"); |
| |
| err = aspace.Destroy(); |
| EXPECT_EQ(err, ZX_OK, "destroy aspace"); |
| |
| END_TEST; |
| } |
| |
| static bool test_large_unaligned_region_without_map() { |
| BEGIN_TEST; |
| |
| unittest_printf("creating large un-aligned vm region, and unmap it without mapping (ZX-315)\n"); |
| { |
| ArchVmAspace aspace; |
| vaddr_t base = 1UL << 20; |
| size_t size = (1UL << 47) - base - (1UL << 20); |
| zx_status_t err = aspace.Init(1UL << 20, size, 0); |
| EXPECT_EQ(err, ZX_OK, "init aspace"); |
| |
| const uint arch_rw_flags = ARCH_MMU_FLAG_PERM_READ | ARCH_MMU_FLAG_PERM_WRITE; |
| |
| // We want our region to be misaligned by a page, and for it to |
| // straddle the PDP |
| vaddr_t va = (1UL << PGTABLE_L1_SHIFT) - (1UL << PGTABLE_L2_SHIFT) + PAGE_SIZE; |
| // Make sure alloc_size is bigger than 1 PD page, to exercise the |
| // non-terminal code path. |
| static const size_t alloc_size = 3UL << PGTABLE_L2_SHIFT; |
| |
| // Map a single page to force the lower PDP of the target region |
| // to be created |
| size_t mapped; |
| err = aspace.MapContiguous(va - 2 * PAGE_SIZE, 0, 1, arch_rw_flags, &mapped); |
| EXPECT_EQ(err, ZX_OK, "map single page"); |
| EXPECT_EQ(mapped, 1u, "map single page"); |
| |
| // Attempt to unmap the target region (analogous to unmapping a demand |
| // paged region that has not been touched) |
| size_t unmapped; |
| err = aspace.Unmap(va, alloc_size / PAGE_SIZE, &unmapped); |
| EXPECT_EQ(err, ZX_OK, "unmap unallocated region"); |
| EXPECT_EQ(unmapped, alloc_size / PAGE_SIZE, "unmap unallocated region"); |
| |
| // Unmap the single page from earlier |
| err = aspace.Unmap(va - 2 * PAGE_SIZE, 1, &unmapped); |
| EXPECT_EQ(err, ZX_OK, "unmap single page"); |
| EXPECT_EQ(unmapped, 1u, "unmap single page"); |
| |
| err = aspace.Destroy(); |
| EXPECT_EQ(err, ZX_OK, "destroy aspace"); |
| } |
| |
| END_TEST; |
| } |
| |
| UNITTEST_START_TESTCASE(mmu_tests) |
| UNITTEST("create large unaligned region and ensure it can be unmapped", test_large_unaligned_region) |
| UNITTEST("create large unaligned region without mapping and ensure it can be unmapped", |
| test_large_unaligned_region_without_map) |
| UNITTEST_END_TESTCASE(mmu_tests, "mmu", "mmu tests"); |