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Bug 694432 - Make the LdrLoadDll hook compatible with Windows 8 by not assuming that a valid path would always be passed; r=bsmedberg

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--HG--
extra : rebase_source : e0df4ea7724118968276d55a0ec25fe4111756d4
This commit is contained in:
Ehsan Akhgari 2011-10-17 16:15:08 -04:00
parent d5111d16d8
commit 082fd77472
1 changed files with 8 additions and 2 deletions
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10
toolkit/xre/nsWindowsDllBlocklist.cpp
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@ -210,11 +210,17 @@ patched_LdrLoadDll (PWCHAR filePath, PULONG flags, PUNICODE_STRING moduleFileNam
wchar_t *dll_part;
DllBlockInfo *info;
// In Windows 8, the first parameter seems to be used for more than just the
// path name. For example, its numerical value can be 1. Passing a non-valid
// pointer to SearchPathW will cause a crash, so we need to check to see if we
// are handed a valid pointer, and otherwise just pass NULL to SearchPathW.
PWCHAR sanitizedFilePath = (intptr_t(filePath) < 1024) ? NULL : filePath;
int len = moduleFileName->Length / 2;
wchar_t *fname = moduleFileName->Buffer;
// figure out the length of the string that we need
DWORD pathlen = SearchPathW(filePath, fname, L".dll", 0, NULL, NULL);
DWORD pathlen = SearchPathW(sanitizedFilePath, fname, L".dll", 0, NULL, NULL);
if (pathlen == 0) {
// uh, we couldn't find the DLL at all, so...
printf_stderr("LdrLoadDll: Blocking load of '%s' (SearchPathW didn't find it?)\n", dllName);
@ -228,7 +234,7 @@ patched_LdrLoadDll (PWCHAR filePath, PULONG flags, PUNICODE_STRING moduleFileNam
}
// now actually grab it
SearchPathW(filePath, fname, L".dll", pathlen+1, full_fname, NULL);
SearchPathW(sanitizedFilePath, fname, L".dll", pathlen+1, full_fname, NULL);
// The filename isn't guaranteed to be null terminated, but in practice
// it always will be; ensure that this is so, and bail if not.