I was hoping that the new tests would provide evidence that RtlQueryRegistryValues uses RegGetValue to ensure that multi-strings are double-null-terminated. Instead the tests suggest that my hypothesis was wrong because RegGetValue only ensures single null termination, not double null termination. We should fix RegGetValue anyway for the sake of applications that expect it to null-terminate.
-- v10: kernelbase: Ensure null termination in RegGetValue[AW].
From: Alex Henrie alexhenrie24@gmail.com
--- dlls/windowscodecs/info.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/dlls/windowscodecs/info.c b/dlls/windowscodecs/info.c index f42fc8932c9..67704365c06 100644 --- a/dlls/windowscodecs/info.c +++ b/dlls/windowscodecs/info.c @@ -50,8 +50,7 @@ static HRESULT ComponentInfo_GetStringValue(HKEY classkey, LPCWSTR value, if (!actual_size) return E_INVALIDARG;
- ret = RegGetValueW(classkey, NULL, value, RRF_RT_REG_SZ|RRF_NOEXPAND, NULL, - buffer, &cbdata); + ret = RegQueryValueExW(classkey, value, 0, NULL, (void *)buffer, &cbdata);
if (ret == ERROR_FILE_NOT_FOUND) {
From: Alex Henrie alexhenrie24@gmail.com
--- dlls/advapi32/tests/registry.c | 20 ++++----- dlls/kernelbase/registry.c | 76 +++++++++++++++++++++------------- 2 files changed, 58 insertions(+), 38 deletions(-)
diff --git a/dlls/advapi32/tests/registry.c b/dlls/advapi32/tests/registry.c index 17085cb6b1c..0f77b2fa066 100644 --- a/dlls/advapi32/tests/registry.c +++ b/dlls/advapi32/tests/registry.c @@ -914,13 +914,13 @@ static void test_get_value(void) size = 0; ret = pRegGetValueA(hkey_main, NULL, "TP1_ZB_SZ", RRF_RT_REG_SZ, &type, NULL, &size); ok(ret == ERROR_SUCCESS, "ret=%ld\n", ret); - todo_wine ok(size == 1, "size=%ld\n", size); + ok(size == 1, "size=%ld\n", size); ok(type == REG_SZ, "type=%ld\n", type); ret = pRegGetValueA(hkey_main, NULL, "TP1_ZB_SZ", RRF_RT_REG_SZ, &type, buf, &size); ok(ret == ERROR_SUCCESS, "ret=%ld\n", ret); - todo_wine ok(size == 1, "size=%ld\n", size); + ok(size == 1, "size=%ld\n", size); ok(type == REG_SZ, "type=%ld\n", type); - todo_wine ok(!strcmp(buf, ""), "Expected "", got "%s"\n", buf); + ok(!strcmp(buf, ""), "Expected "", got "%s"\n", buf);
/* Query REG_SZ using RRF_RT_REG_SZ|RRF_NOEXPAND (ok) */ buf[0] = 0; type = 0xdeadbeef; size = sizeof(buf); @@ -2219,15 +2219,15 @@ static void test_string_termination(void) { outsize = insize; ret = pRegGetValueA(subkey, NULL, "stringtest", RRF_RT_REG_SZ, NULL, buffer, &outsize); - todo_wine ok(ret == ERROR_MORE_DATA, "RegGetValueA returned: %ld\n", ret); - todo_wine ok(outsize == insize + 1, "wrong size: %lu != %lu\n", outsize, insize + 1); + ok(ret == ERROR_MORE_DATA, "RegGetValueA returned: %ld\n", ret); + ok(outsize == insize + 1, "wrong size: %lu != %lu\n", outsize, insize + 1); memset(buffer, 0xbd, sizeof(buffer)); ret = pRegGetValueA(subkey, NULL, "stringtest", RRF_RT_REG_SZ, NULL, buffer, &outsize); ok(ret == ERROR_SUCCESS, "RegGetValueA returned: %ld\n", ret); - todo_wine ok(outsize == insize + 1, "wrong size: %lu != %lu\n", outsize, insize + 1); + ok(outsize == insize + 1, "wrong size: %lu != %lu\n", outsize, insize + 1); ok(memcmp(buffer, string, insize) == 0, "bad string: %s/%lu != %s\n", debugstr_an((char*)buffer, insize), insize, string); - todo_wine ok(buffer[insize] == 0, "buffer overflow at %lu %02x\n", insize, buffer[insize]); + ok(buffer[insize] == 0, "buffer overflow at %lu %02x\n", insize, buffer[insize]); }
RegDeleteKeyA(subkey, ""); @@ -2332,13 +2332,13 @@ static void test_multistring_termination(void) { outsize = insize; ret = pRegGetValueA(subkey, NULL, "multistringtest", RRF_RT_REG_SZ, NULL, buffer, &outsize); - todo_wine ok(ret == ERROR_MORE_DATA, "RegGetValueA returned: %ld\n", ret); - todo_wine ok(outsize == insize + 1, "wrong size: %lu != %lu\n", outsize, insize + 1); + ok(ret == ERROR_MORE_DATA, "RegGetValueA returned: %ld\n", ret); + ok(outsize == insize + 1, "wrong size: %lu != %lu\n", outsize, insize + 1); outsize = insize + 2; memset(buffer, 0xbd, sizeof(buffer)); ret = pRegGetValueA(subkey, NULL, "multistringtest", RRF_RT_REG_SZ, NULL, buffer, &outsize); ok(ret == ERROR_SUCCESS, "RegGetValueA returned: %ld\n", ret); - todo_wine ok(outsize == insize + 1, "wrong size: %lu != %lu\n", outsize, insize + 1); + ok(outsize == insize + 1, "wrong size: %lu != %lu\n", outsize, insize + 1); ok(buffer[insize] == 0, "buffer overflow at %lu %02x\n", insize, buffer[insize + 1]); ok(buffer[insize + 1] == 0xbd, "buffer overflow at %lu %02x\n", insize, buffer[insize + 1]); } diff --git a/dlls/kernelbase/registry.c b/dlls/kernelbase/registry.c index ee57a4acdd1..8471376bf96 100644 --- a/dlls/kernelbase/registry.c +++ b/dlls/kernelbase/registry.c @@ -1955,16 +1955,18 @@ LSTATUS WINAPI RegGetValueW( HKEY hKey, LPCWSTR pszSubKey, LPCWSTR pszValue,
ret = RegQueryValueExW(hKey, pszValue, NULL, &dwType, pvData, &cbData);
- /* If we are going to expand we need to read in the whole the value even - * if the passed buffer was too small as the expanded string might be - * smaller than the unexpanded one and could fit into cbData bytes. */ - if ((ret == ERROR_SUCCESS || ret == ERROR_MORE_DATA) && - dwType == REG_EXPAND_SZ && !(dwFlags & RRF_NOEXPAND)) + /* If the value is a string, we need to read in the whole value to be able + * to know exactly how many bytes are needed after expanding the string and + * ensuring that it is null-terminated. */ + if (is_string(dwType) && + (ret == ERROR_MORE_DATA || + (ret == ERROR_SUCCESS && dwType == REG_EXPAND_SZ && !(dwFlags & RRF_NOEXPAND)) || + (ret == ERROR_SUCCESS && (cbData < sizeof(WCHAR) || (pvData && *((WCHAR *)pvData + cbData / sizeof(WCHAR) - 1)))))) { do { heap_free(pvBuf);
- pvBuf = heap_alloc(cbData); + pvBuf = heap_alloc(cbData + sizeof(WCHAR)); if (!pvBuf) { ret = ERROR_NOT_ENOUGH_MEMORY; @@ -1981,25 +1983,33 @@ LSTATUS WINAPI RegGetValueW( HKEY hKey, LPCWSTR pszSubKey, LPCWSTR pszValue, * overlapping buffers. */ CopyMemory(pvBuf, pvData, cbData); } - - /* Both the type or the value itself could have been modified in - * between so we have to keep retrying until the buffer is large - * enough or we no longer have to expand the value. */ - } while (dwType == REG_EXPAND_SZ && ret == ERROR_MORE_DATA); + } while (ret == ERROR_MORE_DATA);
if (ret == ERROR_SUCCESS) { + /* Ensure null termination */ + if (cbData < sizeof(WCHAR) || *((WCHAR *)pvBuf + cbData / sizeof(WCHAR) - 1)) + { + *((WCHAR *)pvBuf + cbData / sizeof(WCHAR)) = 0; + cbData += sizeof(WCHAR); + } + /* Recheck dwType in case it changed since the first call */ - if (dwType == REG_EXPAND_SZ) + if (dwType == REG_EXPAND_SZ && !(dwFlags & RRF_NOEXPAND)) { cbData = ExpandEnvironmentStringsW(pvBuf, pvData, pcbData ? *pcbData : 0) * sizeof(WCHAR); dwType = REG_SZ; - if(pvData && pcbData && cbData > *pcbData) + if (pvData && cbData > *pcbData) ret = ERROR_MORE_DATA; } else if (pvData) - CopyMemory(pvData, pvBuf, *pcbData); + { + if (cbData > *pcbData) + ret = ERROR_MORE_DATA; + else + CopyMemory(pvData, pvBuf, cbData); + } }
heap_free(pvBuf); @@ -2060,16 +2070,18 @@ LSTATUS WINAPI RegGetValueA( HKEY hKey, LPCSTR pszSubKey, LPCSTR pszValue,
ret = RegQueryValueExA(hKey, pszValue, NULL, &dwType, pvData, &cbData);
- /* If we are going to expand we need to read in the whole the value even - * if the passed buffer was too small as the expanded string might be - * smaller than the unexpanded one and could fit into cbData bytes. */ - if ((ret == ERROR_SUCCESS || ret == ERROR_MORE_DATA) && - dwType == REG_EXPAND_SZ && !(dwFlags & RRF_NOEXPAND)) + /* If the value is a string, we need to read in the whole value to be able + * to know exactly how many bytes are needed after expanding the string and + * ensuring that it is null-terminated. */ + if (is_string(dwType) && + (ret == ERROR_MORE_DATA || + (ret == ERROR_SUCCESS && dwType == REG_EXPAND_SZ && !(dwFlags & RRF_NOEXPAND)) || + (ret == ERROR_SUCCESS && (!cbData || (pvData && *((char *)pvData + cbData - 1)))))) { do { heap_free(pvBuf);
- pvBuf = heap_alloc(cbData); + pvBuf = heap_alloc(cbData + 1); if (!pvBuf) { ret = ERROR_NOT_ENOUGH_MEMORY; @@ -2086,25 +2098,33 @@ LSTATUS WINAPI RegGetValueA( HKEY hKey, LPCSTR pszSubKey, LPCSTR pszValue, * overlapping buffers. */ CopyMemory(pvBuf, pvData, cbData); } - - /* Both the type or the value itself could have been modified in - * between so we have to keep retrying until the buffer is large - * enough or we no longer have to expand the value. */ - } while (dwType == REG_EXPAND_SZ && ret == ERROR_MORE_DATA); + } while (ret == ERROR_MORE_DATA);
if (ret == ERROR_SUCCESS) { + /* Ensure null termination */ + if (!cbData || *((char *)pvBuf + cbData - 1)) + { + *((char *)pvBuf + cbData) = 0; + cbData++; + } + /* Recheck dwType in case it changed since the first call */ - if (dwType == REG_EXPAND_SZ) + if (dwType == REG_EXPAND_SZ && !(dwFlags & RRF_NOEXPAND)) { cbData = ExpandEnvironmentStringsA(pvBuf, pvData, pcbData ? *pcbData : 0); dwType = REG_SZ; - if(pvData && pcbData && cbData > *pcbData) + if (pvData && cbData > *pcbData) ret = ERROR_MORE_DATA; } else if (pvData) - CopyMemory(pvData, pvBuf, *pcbData); + { + if (cbData > *pcbData) + ret = ERROR_MORE_DATA; + else + CopyMemory(pvData, pvBuf, cbData); + } }
heap_free(pvBuf);
-
Alex Henrie -
Alex Henrie (＠alexhenrie)