[RFC PATCH 0/2] mm/damon/core: validate damos_quota_goal->nid

SeongJae Park
2026-03-28T00:54:15Z

node_mem[cg]_{used,free}_bp DAMOS quota goals receive the node id. The
node id is used for si_meminfo_node() and NODE_DATA() without proper
validation. As a result, privileged users can trigger an out of bounds
memory access using DAMON_SYSFS. Fix the issues.

The issue was originally reported [1] with a fix by another author. The
original author announced [2] that they will stop working including the
fix that was still in the review stage. Hence I'm restarting this.

[1] https://lore.kernel.org/20260325073034.140353-1-objecting@objecting.org
[2] https://lore.kernel.org/20260327040924.68553-1-sj@kernel.org

SeongJae Park (2):
mm/damon/core: validate damos_quota_goal->nid for
node_mem_{used,free}_bp
mm/damon/core: validate damos_quota_goal->nid for
node_memcg_{used,free}_bp

mm/damon/core.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

base-commit: 7da5718476562bc8136c08216a1621aac09bcb51
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2.47.3