CVE-2017-5055: Use after free in printing. Credit to Wadih Matar
CVE-2017-5054: Heap buffer overflow in V8. Credit to Nicolas Trippar of Zimperium zLabs
CVE-2017-5052: Bad cast in Blink. Credit to JeongHoon Shin
CVE-2017-5056: Use after free in Blink. Credit to anonymous
CVE-2017-5053: Out of bounds memory access in V8. Credit to Team Sniper (Keen Lab and PC Mgr) reported through ZDI (ZDI-CAN-4587)
This patch restructures the expression and wrapper to minimize Nix store
references captured by the user's state directory.
The previous version would write lots of references to the Nix store into
the user's state directory, resulting in synchronization issues between
the Store and the local state directory. At best, this would cause TBB to
stop working when the version used to instantiate the local state was
garbage collected; at worst, a user would continue to use the old version
even after an upgrade.
To solve the issue, hard-code as much as possible at the Store side and
minimize the amount of stuff being copied into the local state dir.
Currently, only a few files generated at firefox startup and fontconfig
cache files end up capturing store paths; these files are simply removed
upon every startup. Otherwise, no capture should occur and the user
should always be using the TBB associated with the tor-browser wrapper
script.
To check for stale Store paths, do
`grep -Ero '/nix/store/[^/]+' ~/.local/share/tor-browser`
This command should *never* return any other store path than the one
associated with the current tor-browser wrapper script, even after an
update (assuming you've run tor-browser at least once after updating).
Deviations from this general rule are considered bugs from now on.
Note that no attempt has been made to support pluggable transports; they
are still broken with this patch (to be fixed in a follow-up patch).
User visible changes:
- Wrapper retains only environment variables required for TBB to work
- pulseaudioSupport can be toggled independently of mediaSupport (the
latter weakly implies the former).
- Store local state under $TBB_HOME. Defaults to $XDG_DATA_HOME/tor-browser
- Stop obnoxious first-run stuff (NoScript redirect, in particular)
- Set desktop item GenericName to Web Browser
Some minor enhancements:
- Disable Hydra builds
- Specify system -> source mapping to make it easier to
extend supported platforms.
Set MOZ_APP_LAUNCHER for firefox as per [1] (see [2] for detailed discussion).
Firefox will recognise itself across verions, skipping the 'not-the-default-browser' prompt.
Firefox will also write sane paths to the generated desktop file, should someone ever set it as default through the 'not-the-default-browser' prompt.
Also removed the unnecessary libtrick cruft.
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=611953
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=593948
