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Diffstat (limited to 'deps/jemalloc/test/unit/san.c')
| -rw-r--r-- | deps/jemalloc/test/unit/san.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/deps/jemalloc/test/unit/san.c b/deps/jemalloc/test/unit/san.c new file mode 100644 index 000000000..5b98f52e6 --- /dev/null +++ b/deps/jemalloc/test/unit/san.c @@ -0,0 +1,207 @@ +#include "test/jemalloc_test.h" +#include "test/arena_util.h" +#include "test/san.h" + +#include "jemalloc/internal/san.h" + +static void +verify_extent_guarded(tsdn_t *tsdn, void *ptr) { + expect_true(extent_is_guarded(tsdn, ptr), + "All extents should be guarded."); +} + +#define MAX_SMALL_ALLOCATIONS 4096 +void *small_alloc[MAX_SMALL_ALLOCATIONS]; + +/* + * This test allocates page sized slabs and checks that every two slabs have + * at least one page in between them. That page is supposed to be the guard + * page. + */ +TEST_BEGIN(test_guarded_small) { + test_skip_if(opt_prof); + + tsdn_t *tsdn = tsd_tsdn(tsd_fetch()); + unsigned npages = 16, pages_found = 0, ends_found = 0; + VARIABLE_ARRAY(uintptr_t, pages, npages); + + /* Allocate to get sanitized pointers. */ + size_t slab_sz = PAGE; + size_t sz = slab_sz / 8; + unsigned n_alloc = 0; + while (n_alloc < MAX_SMALL_ALLOCATIONS) { + void *ptr = malloc(sz); + expect_ptr_not_null(ptr, "Unexpected malloc() failure"); + small_alloc[n_alloc] = ptr; + verify_extent_guarded(tsdn, ptr); + if ((uintptr_t)ptr % PAGE == 0) { + assert_u_lt(pages_found, npages, + "Unexpectedly large number of page aligned allocs"); + pages[pages_found++] = (uintptr_t)ptr; + } + if (((uintptr_t)ptr + (uintptr_t)sz) % PAGE == 0) { + ends_found++; + } + n_alloc++; + if (pages_found == npages && ends_found == npages) { + break; + } + } + /* Should found the ptrs being checked for overflow and underflow. */ + expect_u_eq(pages_found, npages, "Could not found the expected pages."); + expect_u_eq(ends_found, npages, "Could not found the expected pages."); + + /* Verify the pages are not continuous, i.e. separated by guards. */ + for (unsigned i = 0; i < npages - 1; i++) { + for (unsigned j = i + 1; j < npages; j++) { + uintptr_t ptr_diff = pages[i] > pages[j] ? + pages[i] - pages[j] : pages[j] - pages[i]; + expect_zu_ge((size_t)ptr_diff, slab_sz + PAGE, + "There should be at least one pages between " + "guarded slabs"); + } + } + + for (unsigned i = 0; i < n_alloc + 1; i++) { + free(small_alloc[i]); + } +} +TEST_END + +TEST_BEGIN(test_guarded_large) { + tsdn_t *tsdn = tsd_tsdn(tsd_fetch()); + unsigned nlarge = 32; + VARIABLE_ARRAY(uintptr_t, large, nlarge); + + /* Allocate to get sanitized pointers. */ + size_t large_sz = SC_LARGE_MINCLASS; + for (unsigned i = 0; i < nlarge; i++) { + void *ptr = malloc(large_sz); + verify_extent_guarded(tsdn, ptr); + expect_ptr_not_null(ptr, "Unexpected malloc() failure"); + large[i] = (uintptr_t)ptr; + } + + /* Verify the pages are not continuous, i.e. separated by guards. */ + for (unsigned i = 0; i < nlarge; i++) { + for (unsigned j = i + 1; j < nlarge; j++) { + uintptr_t ptr_diff = large[i] > large[j] ? + large[i] - large[j] : large[j] - large[i]; + expect_zu_ge((size_t)ptr_diff, large_sz + 2 * PAGE, + "There should be at least two pages between " + " guarded large allocations"); + } + } + + for (unsigned i = 0; i < nlarge; i++) { + free((void *)large[i]); + } +} +TEST_END + +static void +verify_pdirty(unsigned arena_ind, uint64_t expected) { + uint64_t pdirty = get_arena_pdirty(arena_ind); + expect_u64_eq(pdirty, expected / PAGE, + "Unexpected dirty page amount."); +} + +static void +verify_pmuzzy(unsigned arena_ind, uint64_t expected) { + uint64_t pmuzzy = get_arena_pmuzzy(arena_ind); + expect_u64_eq(pmuzzy, expected / PAGE, + "Unexpected muzzy page amount."); +} + +TEST_BEGIN(test_guarded_decay) { + unsigned arena_ind = do_arena_create(-1, -1); + do_decay(arena_ind); + do_purge(arena_ind); + + verify_pdirty(arena_ind, 0); + verify_pmuzzy(arena_ind, 0); + + /* Verify that guarded extents as dirty. */ + size_t sz1 = PAGE, sz2 = PAGE * 2; + /* W/o maps_coalesce, guarded extents are unguarded eagerly. */ + size_t add_guard_size = maps_coalesce ? 0 : SAN_PAGE_GUARDS_SIZE; + generate_dirty(arena_ind, sz1); + verify_pdirty(arena_ind, sz1 + add_guard_size); + verify_pmuzzy(arena_ind, 0); + + /* Should reuse the first extent. */ + generate_dirty(arena_ind, sz1); + verify_pdirty(arena_ind, sz1 + add_guard_size); + verify_pmuzzy(arena_ind, 0); + + /* Should not reuse; expect new dirty pages. */ + generate_dirty(arena_ind, sz2); + verify_pdirty(arena_ind, sz1 + sz2 + 2 * add_guard_size); + verify_pmuzzy(arena_ind, 0); + + tsdn_t *tsdn = tsd_tsdn(tsd_fetch()); + int flags = MALLOCX_ARENA(arena_ind) | MALLOCX_TCACHE_NONE; + + /* Should reuse dirty extents for the two mallocx. */ + void *p1 = do_mallocx(sz1, flags); + verify_extent_guarded(tsdn, p1); + verify_pdirty(arena_ind, sz2 + add_guard_size); + + void *p2 = do_mallocx(sz2, flags); + verify_extent_guarded(tsdn, p2); + verify_pdirty(arena_ind, 0); + verify_pmuzzy(arena_ind, 0); + + dallocx(p1, flags); + verify_pdirty(arena_ind, sz1 + add_guard_size); + dallocx(p2, flags); + verify_pdirty(arena_ind, sz1 + sz2 + 2 * add_guard_size); + verify_pmuzzy(arena_ind, 0); + + do_purge(arena_ind); + verify_pdirty(arena_ind, 0); + verify_pmuzzy(arena_ind, 0); + + if (config_stats) { + expect_u64_eq(get_arena_npurge(arena_ind), 1, + "Expected purging to occur"); + expect_u64_eq(get_arena_dirty_npurge(arena_ind), 1, + "Expected purging to occur"); + expect_u64_eq(get_arena_dirty_purged(arena_ind), + (sz1 + sz2 + 2 * add_guard_size) / PAGE, + "Expected purging to occur"); + expect_u64_eq(get_arena_muzzy_npurge(arena_ind), 0, + "Expected purging to occur"); + } + + if (opt_retain) { + /* + * With retain, guarded extents are not mergable and will be + * cached in ecache_retained. They should be reused. + */ + void *new_p1 = do_mallocx(sz1, flags); + verify_extent_guarded(tsdn, p1); + expect_ptr_eq(p1, new_p1, "Expect to reuse p1"); + + void *new_p2 = do_mallocx(sz2, flags); + verify_extent_guarded(tsdn, p2); + expect_ptr_eq(p2, new_p2, "Expect to reuse p2"); + + dallocx(new_p1, flags); + verify_pdirty(arena_ind, sz1 + add_guard_size); + dallocx(new_p2, flags); + verify_pdirty(arena_ind, sz1 + sz2 + 2 * add_guard_size); + verify_pmuzzy(arena_ind, 0); + } + + do_arena_destroy(arena_ind); +} +TEST_END + +int +main(void) { + return test( + test_guarded_small, + test_guarded_large, + test_guarded_decay); +} |