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Change History

In the Linux kernel, the following vulnerability has been resolved:

mm/vmalloc: take vmap_purge_lock in shrinker

decay_va_pool_node() can be invoked concurrently from two paths:
__purge_vmap_area_lazy() when pools are being purged, and the shrinker via
vmap_node_shrink_scan().

However, decay_va_pool_node() is not safe to run concurrently, and the
shrinker path currently lacks serialization, leading to races and possible
leaks.

Protect decay_va_pool_node() by taking vmap_purge_lock in the shrinker
path to ensure serialization with purge users.

https://git.kernel.org/stable/c/12f2341b4c235d5593a433abac201c1c6725787f

https://git.kernel.org/stable/c/687ccdf582169cd680aeaf24cc953807c4cd4345

https://git.kernel.org/stable/c/ec05f51f1e65bce95528543eb73fda56fd201d94