Michael Tsai on Twitter: "@rosyna @drewthaler Not handy. DTS eventually explained it to me; they were initially unaware, too. I fear more undocumented cases like this"

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Drew Thaler ‏@drewthaler Feb 15

@rosyna @mjtsai Or touch that file or whatever. But notice that Spotify isn't malicious, in the example it's hijacked and becomes malicious
Rosyna Keller ‏@rosyna Feb 15

@drewthaler @mjtsai That actually happened to Twitter for Mac OS X a few years ago due to an image parsing bug.
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Michael Tsai ‏@mjtsai Feb 15

@rosyna @drewthaler Even for things that would never be approved in the Mac App Store, so that every Developer ID app can be sandboxed.
Rosyna Keller ‏@rosyna Feb 15

@mjtsai @drewthaler That's exactly how sandboxing works today on Mac OS X.
Michael Tsai ‏@mjtsai Feb 16

@rosyna @drewthaler And it doesn’t, AFAIK, address APIs that area available but behave differently when the app is sandboxed.
Rosyna Keller ‏@rosyna Feb 16

@mjtsai @drewthaler Which such APIs do that? There is a list of "temporary extensions" that are only temp for MAS https://developer.apple.com/library/mac/documentation/Miscellaneous/Reference/EntitlementKeyReference/Chapters/AppSandboxTemporaryExceptionEntitlements.html#//apple_ref/doc/uid/TP40011195-CH5-SW1 …
Michael Tsai ‏@mjtsai Feb 16

@rosyna @drewthaler For example, -[NSWorkspace openFile:]. The rules have changed several times w/ OS versions and are not documented.
Rosyna Keller ‏@rosyna Feb 16

@mjtsai @drewthaler What rules for openFile:? You just need to call startAccessingSecurityScopedResource: first to punch a hole in sandbox
Michael Tsai ‏@mjtsai Feb 16

@rosyna @drewthaler No, there are cases where the document can't be opened if the app for it isn’t sandboxed, even if you punch a hole.
Rosyna Keller ‏@rosyna Feb 16

@mjtsai @drewthaler Do you have an example of that? Because LaunchServices handles openFile.

‏@mjtsai

@rosyna @drewthaler Not handy. DTS eventually explained it to me; they were initially unaware, too. I fear more undocumented cases like this

3:55 PM - 16 Feb 2016

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