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| author |  SeongJae Park <sj@kernel.org>
| 2023-12-08 17:50:18 +0000 |
|---|---|---|
| committer |  Andrew Morton <akpm@linux-foundation.org>
| 2023-12-12 17:20:17 -0800 |
| commit | 6376a824595607e99d032a39ba3394988b4fce96 (patch) | |
| tree | 7176ac63c877da843207b5799f76b4c0cf51a743 /arch/mips/include/asm/cache.h | |
| parent | selftests/mm: cow: print ksft header before printing anything else (diff) | |
| download | linux-6376a824595607e99d032a39ba3394988b4fce96.tar.gz linux-6376a824595607e99d032a39ba3394988b4fce96.tar.bz2 linux-6376a824595607e99d032a39ba3394988b4fce96.zip | |
mm/damon/core: make damon_start() waits until kdamond_fn() starts
The cleanup tasks of kdamond threads including reset of corresponding
DAMON context's ->kdamond field and decrease of global nr_running_ctxs
counter is supposed to be executed by kdamond_fn(). However, commit
0f91d13366a4 ("mm/damon: simplify stop mechanism") made neither
damon_start() nor damon_stop() ensure the corresponding kdamond has
started the execution of kdamond_fn().
As a result, the cleanup can be skipped if damon_stop() is called fast
enough after the previous damon_start(). Especially the skipped reset
of ->kdamond could cause a use-after-free.
Fix it by waiting for start of kdamond_fn() execution from
damon_start().
Link: https://lkml.kernel.org/r/20231208175018.63880-1-sj@kernel.org
Fixes: 0f91d13366a4 ("mm/damon: simplify stop mechanism")
Signed-off-by: SeongJae Park <sj@kernel.org>
Reported-by: Jakub Acs <acsjakub@amazon.de>
Cc: Changbin Du <changbin.du@intel.com>
Cc: Jakub Acs <acsjakub@amazon.de>
Cc: <stable@vger.kernel.org> # 5.15.x
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/mips/include/asm/cache.h')
0 files changed, 0 insertions, 0 deletions