** Description changed:
Ubuntu SDK applications that use webkit webviews create shared memory files
as /run/shm/WK2SharedMemory*. This results in an AppArmor rule like the
following:
owner /{,run/}shm/WK2SharedMemory.[0-9]* rwk,
But this rule is too lenient because a malicious app could enumerate
these files and attack shared memory of other applications. Therefore,
these paths need to be made application specific. One suggestion is to
- use something like shm_open("%s-WK2SharedMemory" % <app id>") instead of
- shm_open("WK2SharedMemory") where '<app id>' will ultimately be the
- reverse domain name with Click packages (see bug #1197037 for details on
- '<app id>').
+ use something like shm_open("%s-WK2SharedMemory" % <app_pkgname>")
+ instead of shm_open("WK2SharedMemory") where '<app_pkgname>' is the
+ "name" field in the Click manifest (see bug #1197037 for details).
Future work will allow for AppArmor IPC to handle this without
modifications to the SDK, but this may be 14.04 so we need a solution
for 13.10. I recommend fixing this bug after the other SDK bugs I filed
today, then talk to the security team before fixing this bug since it is
possible we will have something for 13.10 that doesn't require altering
the SDK.
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https://bugs.launchpad.net/bugs/1197060
Title:
SDK webview applications should use an app-specific path for shared
memory files
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