Related to How to know whether a RAM module is vulnerable to rowhammer before buying?, how can I check whether my already installed memory modules are susceptible to this attack, without having to use any Windows/Mac-only tools?
There's a PoC module for detecting Rowhammer, but it seems many people have had problems compiling it and the issue has gone cold (no response since October 2015).
The Exploiting the DRAM rowhammer bug to gain kernel privileges article linked to in @J.A.K.'s answer had a link to Google's rowhammer-test program for checking for this vulnerability on "Linux or Mac OS X" and "x86-32 or x86-64". It runs indefinitely, stopping only if it detects a bit flip. One forum post recommends running for at least 30 minutes before considering the RAM safe.
MemTest86* version 7 has a Rowhammer test, but it only works on systems with UEFI support.
* not to be confused with MemTest86+.
