In the Linux kernel, the following vulnerability has been resolved: mm/pagealloc: fix race condition in unaccepted memory handling The page allocator tracks the number of zones that have unaccepted memory using staticbranchenc/dec() and uses that static branch in hot paths to determine if it needs to deal with unaccepted memory. Borislav and Thomas pointed out that the tracking is racy: operations on staticbranch are not serialized against adding/removing unaccepted pages to/from the zone. Sanity checks inside staticbranch machinery detects it: WARNING: CPU: 0 PID: 10 at kernel/jumplabel.c:276 _statickeyslowdeccpuslocked+0x8e/0xa0 The comment around the WARN() explains the problem: /* * Warn about the '-1' case though; since that means a * decrement is concurrent with a first (0->1) increment. IOW * people are trying to disable something that wasn't yet fully * enabled. This suggests an ordering problem on the user side. */ The effect of this staticbranch optimization is only visible on microbenchmark. Instead of adding more complexity around it, remove it altogether.
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