From: Andrew Morton <akpm@linux-foundation.org>
To: mm-commits@vger.kernel.org,stable@vger.kernel.org,shuah@kernel.org,sj@kernel.org,akpm@linux-foundation.org
Subject: [merged mm-hotfixes-stable] mm-damon-sysfs-schemes-free-old-damon_sysfs_scheme_filter-memcg_path-on-write.patch removed from -mm tree
Date: Wed, 25 Jun 2025 15:55:57 -0700 [thread overview]
Message-ID: <20250625225558.25956C4CEEA@smtp.kernel.org> (raw)
The quilt patch titled
Subject: mm/damon/sysfs-schemes: free old damon_sysfs_scheme_filter->memcg_path on write
has been removed from the -mm tree. Its filename was
mm-damon-sysfs-schemes-free-old-damon_sysfs_scheme_filter-memcg_path-on-write.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/sysfs-schemes: free old damon_sysfs_scheme_filter->memcg_path on write
Date: Thu, 19 Jun 2025 11:36:07 -0700
memcg_path_store() assigns a newly allocated memory buffer to
filter->memcg_path, without deallocating the previously allocated and
assigned memory buffer. As a result, users can leak kernel memory by
continuously writing a data to memcg_path DAMOS sysfs file. Fix the leak
by deallocating the previously set memory buffer.
Link: https://lkml.kernel.org/r/20250619183608.6647-2-sj@kernel.org
Fixes: 7ee161f18b5d ("mm/damon/sysfs-schemes: implement filter directory")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: <stable@vger.kernel.org> [6.3.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/damon/sysfs-schemes.c | 1 +
1 file changed, 1 insertion(+)
--- a/mm/damon/sysfs-schemes.c~mm-damon-sysfs-schemes-free-old-damon_sysfs_scheme_filter-memcg_path-on-write
+++ a/mm/damon/sysfs-schemes.c
@@ -472,6 +472,7 @@ static ssize_t memcg_path_store(struct k
return -ENOMEM;
strscpy(path, buf, count + 1);
+ kfree(filter->memcg_path);
filter->memcg_path = path;
return count;
}
_
Patches currently in -mm which might be from sj@kernel.org are
mm-damon-introduce-damon_stat-module.patch
mm-damon-introduce-damon_stat-module-fix.patch
mm-damon-stat-calculate-and-expose-estimated-memory-bandwidth.patch
mm-damon-stat-calculate-and-expose-idle-time-percentiles.patch
docs-admin-guide-mm-damon-add-damon_stat-usage-document.patch
mm-damon-paddr-use-alloc_migartion_target-with-no-migration-fallback-nodemask.patch
revert-mm-rename-alloc_demote_folio-to-alloc_migrate_folio.patch
revert-mm-make-alloc_demote_folio-externally-invokable-for-migration.patch
selftets-damon-add-a-test-for-memcg_path-leak.patch
mm-damon-sysfs-schemes-decouple-from-damos_quota_goal_metric.patch
mm-damon-sysfs-schemes-decouple-from-damos_action.patch
mm-damon-sysfs-schemes-decouple-from-damos_wmark_metric.patch
mm-damon-sysfs-schemes-decouple-from-damos_filter_type.patch
mm-damon-sysfs-decouple-from-damon_ops_id.patch
reply other threads:[~2025-06-25 22:55 UTC|newest]
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