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| author | Uladzislau Rezki (Sony) <urezki@gmail.com> | 2026-04-13 21:26:46 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-04-18 23:24:27 -0700 |
| commit | ec05f51f1e65bce95528543eb73fda56fd201d94 (patch) | |
| tree | 54fbbfbfbcd82cf9d015e8647215016d99cfff43 | |
| parent | 615d9bb2ccad42f9e21d837431e401db2e471195 (diff) | |
| download | linux-ec05f51f1e65bce95528543eb73fda56fd201d94.tar.gz linux-ec05f51f1e65bce95528543eb73fda56fd201d94.zip | |
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.
Link: https://lore.kernel.org/20260413192646.14683-1-urezki@gmail.com
Fixes: 7679ba6b36db ("mm: vmalloc: add a shrinker to drain vmap pools")
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: Baoquan He <baoquan.he@linux.dev>
Cc: chenyichong <chenyichong@uniontech.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/vmalloc.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 61caa55a4402..676851d5cfe7 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -5416,6 +5416,7 @@ vmap_node_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) { struct vmap_node *vn; + guard(mutex)(&vmap_purge_lock); for_each_vmap_node(vn) decay_va_pool_node(vn, true); |