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src: dll: FspFsctlFixServiceSecurity

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- fix GetEffectiveRightsFromAclW ERROR_CIRCULAR_DEPENDENCY
This commit is contained in:
Bill Zissimopoulos 2017-04-12 10:50:27 -07:00
parent 8bb46a5f86
commit 5d8384a508
1 changed files with 12 additions and 4 deletions
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16
src/dll/fsctl.c
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@ -355,10 +355,18 @@ static NTSTATUS FspFsctlFixServiceSecurity(HANDLE SvcHandle)
{
LastError = GetEffectiveRightsFromAclW(Dacl, &AccessEntry.Trustee, &AccessRights);
if (0 != LastError)
{
Result = FspNtStatusFromWin32(LastError);
goto exit;
}
/*
* Apparently GetEffectiveRightsFromAclW can fail with ERROR_CIRCULAR_DEPENDENCY
* in some rare circumstances. Calling GetEffectiveRightsFromAclW is not essential
* in this instance. It is only done to check whether the "Everyone/World" SID
* already has the access required to start the FSD; if it does not have those
* rights already they are added. It is probably safe to just assume that the
* required rights are not there if GetEffectiveRightsFromAclW fails; the worst
* that can happen is that the rights get added twice (which is benign).
*
* See https://github.com/billziss-gh/winfsp/issues/62
*/
AccessRights = 0;
}
/* do we have the required access rights? */