Changes the semantics of the security.sandbox.content.level pref on OS X with
respect to file access to the user's home directory. With the fix, Nightly
defaults to 2 while other releases will default to 1. The level values now
have the following meaning.
*) security.sandbox.content.level=0 disables content process sandboxing.
No change here.
*) security.sandbox.content.level=1 blocks write access to the majority of the
home directory.
*) security.sandbox.content.level=2 includes the write access blocking in
level 1, but also blocks both read and write access to ~/Library and $PROFILE
excluding the extensions and weave subdirectories.
Prior to this fix, Nightly defaulted to a value of 1 while all other releases
used 0. The value of 1 meant that read/write access to ~/Library and the
$PROFILE dir (excluding $PROFILE/{extensions,weave}) was prevented.
The strength of a level=1 sandbox is reduced by this with fix,
but level=1 becomes the first ride-the-trains content sandbox candidate,
Nightly changes to level=2, and higher levels still indicate a more
restrictive sandbox.
MozReview-Commit-ID: 7NJAe24T4pU
58b37d201f