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dmesg output of running this LKDTM test with PaX: [187095.475573] lkdtm: No crash points registered, enable through debugfs [187118.020257] lkdtm: Performing direct entry WRAP_ATOMIC [187118.030045] lkdtm: attempting atomic underflow [187118.030929] PAX: refcount overflow detected in: bash:1790, uid/euid: 0/0 [187118.071667] PAX: refcount overflow occured at: lkdtm_do_action+0x19e/0x400 [lkdtm] [187118.081423] CPU: 3 PID: 1790 Comm: bash Not tainted 4.2.6-pax-refcount-split+ #2 [187118.083403] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 [187118.102596] task: ffff8800da8de040 ti: ffff8800da8e4000 task.ti: ffff8800da8e4000 [187118.111321] RIP: 0010:[<ffffffffc00fc2fe>] [<ffffffffc00fc2fe>] lkdtm_do_action+0x19e/0x400 [lkdtm] ... [187118.128074] lkdtm: attempting atomic overflow [187118.128080] PAX: refcount overflow detected in: bash:1790, uid/euid: 0/0 [187118.128082] PAX: refcount overflow occured at: lkdtm_do_action+0x1b6/0x400 [lkdtm] [187118.128085] CPU: 3 PID: 1790 Comm: bash Not tainted 4.2.6-pax-refcount-split+ #2 [187118.128086] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 [187118.128088] task: ffff8800da8de040 ti: ffff8800da8e4000 task.ti: ffff8800da8e4000 [187118.128092] RIP: 0010:[<ffffffffc00fc316>] [<ffffffffc00fc316>] lkdtm_do_action+0x1b6/0x400 [lkdtm] Signed-off-by: David Windsor <dave@progbits.org> [cleaned up whitespacing, keescook] Signed-off-by: Kees Cook <keescook@chromium.org>