1514889 - Flash Player cannot write Local Shared Objects on Windows (x64 sandbox)

Status: RESOLVED DUPLICATE of bug 1513966

(Core Graveyard :: Plug-ins, defect, P1)

Description

[Jeromie Clark]

Attachment: TestLSO.zip

Flash Player appears to be unable to flush Local Shared Objects to disk on Windows 10, after a particular change to the 64-bit NPAPI sandbox.  

Interestingly, we only started getting reports of this in the last week, but it appears to have been injected back on May 22nd in Nightly.  I've included bisection details from mozregression below. 

To reproduce: 
Install the latest Flash Player (https://get.adobe.com/flashplayer)
Extract the attached .zip file to a webserver
Open testLSO.html in the browser
Authorize Flash to run

Actual: 
The test will show FAIL

Expected: 
The test will show PASS, and the counter will persist and increment across page loads.

Bisection logs: 

2018-12-17T13:20:42: INFO : application_name: Firefox
2018-12-17T13:20:42: INFO : application_remotingname: firefox
2018-12-17T13:20:42: INFO : application_repository: https://hg.mozilla.org/integration/mozilla-inbound
2018-12-17T13:20:42: INFO : application_vendor: Mozilla
2018-12-17T13:20:42: INFO : application_version: 62.0a1
2018-12-17T13:20:42: INFO : platform_buildid: 20180522002314
2018-12-17T13:20:42: INFO : platform_changeset: ba708fde30b8f8d2ae4d1febfa2e88e2c1bf1cc4
2018-12-17T13:20:42: INFO : platform_repository: https://hg.mozilla.org/integration/mozilla-inbound
2018-12-17T13:20:42: INFO : platform_version: 62.0a1
2018-12-17T13:21:01: INFO : Narrowed inbound regression window from [43ea2b79, a910482f] (3 builds) to [ba708fde, a910482f] (2 builds) (~1 steps left)
2018-12-17T13:21:01: DEBUG : Starting merge handling...
2018-12-17T13:21:01: DEBUG : Using url: https://hg.mozilla.org/integration/mozilla-inbound/json-pushes?changeset=a910482f4598931944910a357431b22f823578fb&full=1
2018-12-17T13:21:02: DEBUG : Found commit message:
Bug 1366256 - Part 4: Add plugin DLL to plugin sandbox exceptions list. r=bobowen

This permits opening the DLL from the plugin sandbox under the USER_LIMITED sandbox setting (plugin sandbox level 3).

2018-12-17T13:21:02: DEBUG : Did not find a branch, checking all integration branches
2018-12-17T13:21:02: INFO : The bisection is done.
2018-12-17T13:21:02: INFO : Stopped

Comment 1

[Chris Peterson [:cpeterson]]

David, sandbox level 3 (bug 1366256) looks like it broke Flash's Local Shared Objects.

Comment 2

[David Parks [:handyman]]

We got the report too -- bug 1513966.  I'm looking at it but don't know what to do yet.  This helps though because this test case should be easier to investigate.