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nvs: check CRC of items on full pages

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Previously NVS did check CRC values of key-value pairs on the active
page, but the check for full pages was missing. This adds the necessary
check and a test for it.
This commit is contained in:
Ivan Grokhotkov 2017-09-04 11:54:18 +08:00
parent c0510c4266
commit c0269bc1cd
2 changed files with 49 additions and 0 deletions
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11
components/nvs_flash/src/nvs_page.cpp
View file

@ -577,6 +577,17 @@ esp_err_t Page::mLoadEntryTable()
}
mHashList.insert(item, i);
if (item.crc32 != item.calculateCrc32()) {
err = eraseEntryAndSpan(i);
if (err != ESP_OK) {
mState = PageState::INVALID;
return err;
}
continue;
}
assert(item.span > 0);
size_t span = item.span;
i += span - 1;

38
components/nvs_flash/test_nvs_host/test_nvs.cpp
View file

@ -1095,6 +1095,44 @@ TEST_CASE("recovery after failure to write data", "[nvs]")
}
}
TEST_CASE("crc errors in item header are handled", "[nvs]")
{
SpiFlashEmulator emu(3);
Storage storage;
// prepare some data
TEST_ESP_OK(storage.init(0, 3));
TEST_ESP_OK(storage.writeItem(0, "ns1", static_cast<uint8_t>(1)));
TEST_ESP_OK(storage.writeItem(1, "value1", static_cast<uint32_t>(1)));
TEST_ESP_OK(storage.writeItem(1, "value2", static_cast<uint32_t>(2)));
// corrupt item header
uint32_t val = 0;
emu.write(32 * 3, &val, 4);
// check that storage can recover
TEST_ESP_OK(storage.init(0, 3));
TEST_ESP_OK(storage.readItem(1, "value2", val));
CHECK(val == 2);
// check that the corrupted item is no longer present
TEST_ESP_ERR(ESP_ERR_NVS_NOT_FOUND, storage.readItem(1, "value1", val));
// add more items to make the page full
for (size_t i = 0; i < Page::ENTRY_COUNT; ++i) {
char item_name[Item::MAX_KEY_LENGTH + 1];
snprintf(item_name, sizeof(item_name), "item_%ld", i);
TEST_ESP_OK(storage.writeItem(1, item_name, static_cast<uint32_t>(i)));
}
// corrupt another item on the full page
val = 0;
emu.write(32 * 4, &val, 4);
// check that storage can recover
TEST_ESP_OK(storage.init(0, 3));
// check that the corrupted item is no longer present
TEST_ESP_ERR(ESP_ERR_NVS_NOT_FOUND, storage.readItem(1, "value2", val));
}
TEST_CASE("crc error in variable length item is handled", "[nvs]")
{
SpiFlashEmulator emu(3);