SeongJae Park ec7b81b0ab mm/damon/core: make damon_start() waits until kdamond_fn() starts ... commit 6376a824595607e99d032a39ba3394988b4fce96 upstream. 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 0f91d13366 ("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: 0f91d13366 ("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> Signed-off-by: SeongJae Park <sj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-01-01 12:39:08 +00:00
..
Kconfig	…
Makefile	…
core-test.h	…
core.c	mm/damon/core: make damon_start() waits until kdamond_fn() starts	2024-01-01 12:39:08 +00:00
dbgfs-test.h	…
dbgfs.c	…
lru_sort.c	mm/damon/lru_sort: avoid divide-by-zero in hot threshold calculation	2023-11-28 17:07:09 +00:00
modules-common.h	…
ops-common.c	mm/damon/ops-common: avoid divide-by-zero during region hotness calculation	2023-11-28 17:07:09 +00:00
ops-common.h	…
paddr.c	…
reclaim.c	…
sysfs.c	mm/damon/sysfs: eliminate potential uninitialized variable warning	2023-12-13 18:39:12 +01:00
vaddr-test.h	…
vaddr.c	…