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[RTL][NTDLL_APITEST] Fix buffer overflow in RtlDosSearchPath_Ustr (#7698)

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In addition:
- `IS_PATH_SEPARATOR(*--End)` -> `--End; IS_PATH_SEPARATOR(*End)` fix,
- Use SIZE_T type for `WorstCaseLength` and `NamePlusExtLength`.
This commit is contained in:
Max Korostil 2025-02-05 23:17:11 +03:00 committed by GitHub
parent a1a169fbe8
commit 2b2bdabe72
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GPG key ID: B5690EEEBB952194
2 changed files with 39 additions and 15 deletions
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19
modules/rostests/apitests/ntdll/RtlDosSearchPath_Ustr.c
View file

@ -210,4 +210,23 @@ START_TEST(RtlDosSearchPath_Ustr)
ok_eq_pointer(FullNameOut, NULL);
ok_eq_ulong(FilePartSize, 0UL);
ok_eq_ulong(LengthNeeded, 0UL);
/* Buffer overflow test
* length(longDirName) + length(longFileName) + length(ext) = MAX_PATH
*/
RtlInitUnicodeString(&PathString, L"C:\\Program Files\\Very_long_test_path_which_can_trigger_heap_overflow_test_1234567890______________________________________________________AB");
RtlInitUnicodeString(&FileNameString, L"this_is_long_file_name_for_checking______________________________________________________________________________CD");
RtlInitUnicodeString(&ExtensionString, L".txt");
StartSeh()
Status = RtlDosSearchPath_Ustr(0,
&PathString,
&FileNameString,
&ExtensionString,
&CallerBuffer,
&DynamicString,
&FullNameOut,
&FilePartSize,
&LengthNeeded);
ok_eq_hex(Status, STATUS_NO_SUCH_FILE);
EndSeh(STATUS_SUCCESS);
}

21
sdk/lib/rtl/path.c
View file

@ -2571,8 +2571,8 @@ RtlDosSearchPath_Ustr(IN ULONG Flags,
NTSTATUS Status;
RTL_PATH_TYPE PathType;
PWCHAR p, End, CandidateEnd, SegmentEnd;
SIZE_T SegmentSize, ByteCount, PathSize, MaxPathSize = 0;
USHORT NamePlusExtLength, WorstCaseLength, ExtensionLength = 0;
SIZE_T WorstCaseLength, NamePlusExtLength, SegmentSize, ByteCount, PathSize, MaxPathSize = 0;
USHORT ExtensionLength = 0;
PUNICODE_STRING FullIsolatedPath;
DPRINT("DOS Path Search: %lx %wZ %wZ %wZ %wZ %wZ\n",
Flags, PathString, FileNameString, ExtensionString, CallerBuffer, DynamicString);
@ -2669,7 +2669,8 @@ RtlDosSearchPath_Ustr(IN ULONG Flags,
while (End > FileNameString->Buffer)
{
/* If we find a path separator, there's no extension */
if (IS_PATH_SEPARATOR(*--End)) break;
--End;
if (IS_PATH_SEPARATOR(*End)) break;
/* Otherwise, did we find an extension dot? */
if (*End == L'.')
@ -2689,7 +2690,9 @@ RtlDosSearchPath_Ustr(IN ULONG Flags,
/* Start parsing the path name, looking for path separators */
End = &PathString->Buffer[PathString->Length / sizeof(WCHAR)];
p = End;
while ((p > PathString->Buffer) && (*--p == L';'))
while (p > PathString->Buffer)
{
if (*--p == L';')
{
/* This is the size of the path -- handle a trailing slash */
PathSize = End - p - 1;
@ -2701,6 +2704,7 @@ RtlDosSearchPath_Ustr(IN ULONG Flags,
/* Keep going with the path after this path separator */
End = p;
}
}
/* This is the trailing path, run the same code as above */
PathSize = End - p;
@ -2749,7 +2753,7 @@ RtlDosSearchPath_Ustr(IN ULONG Flags,
/* Now check if our initial static buffer is too small */
if (StaticCandidateString.MaximumLength <
(SegmentSize + ExtensionLength + FileNameString->Length))
(SegmentSize + ExtensionLength + FileNameString->Length + sizeof(UNICODE_NULL)))
{
/* At this point we should've been using our static buffer */
ASSERT(StaticCandidateString.Buffer == StaticCandidateBuffer);
@ -2784,8 +2788,7 @@ RtlDosSearchPath_Ustr(IN ULONG Flags,
}
/* Now allocate the dynamic string */
StaticCandidateString.MaximumLength = FileNameString->Length +
WorstCaseLength;
StaticCandidateString.MaximumLength = WorstCaseLength;
StaticCandidateString.Buffer = RtlpAllocateStringMemory(WorstCaseLength,
TAG_USTR);
if (!StaticCandidateString.Buffer)
@ -2832,6 +2835,7 @@ RtlDosSearchPath_Ustr(IN ULONG Flags,
StaticCandidateString.Length = (USHORT)(CandidateEnd -
StaticCandidateString.Buffer) *
sizeof(WCHAR);
ASSERT(StaticCandidateString.Length < StaticCandidateString.MaximumLength);
/* Check if this file exists */
DPRINT("BUFFER: %S\n", StaticCandidateString.Buffer);
@ -2901,7 +2905,8 @@ RtlDosSearchPath_Ustr(IN ULONG Flags,
while (End > p)
{
/* If there's a path separator, there's no extension */
if (IS_PATH_SEPARATOR(*--End)) break;
--End;
if (IS_PATH_SEPARATOR(*End)) break;
/* Othwerwise, did we find an extension dot? */
if (*End == L'.')