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b=CfHMA57v/es7Bf6Eh48NbQYpsR1IkkJ+j14HygB2KVFBx6o7mM+KtPXG1lZWxmN/U Pf9ZN9c7Q+WV7pcelUlpmQi/cTf/Ywfou7qiOMVwvTkubK3loe8DSiSbxUkhK1X2/S ZAekMOpzQbN3Zs8yVaYlXa2rRmDhcDGtm6h3Jdr4o28FjuaM4hui82zuh4/Ku+mNxB nKiGXJCmjDdIqlxQwQW07DDL/JMlXQqhZRhgvnvxVHMABM6X4yUYUcew8/IbX8DnNn +v0pze6gHtm+vn6PgwLlhAaAs8IyeftrqVHqkg2g2ekt3IcLXmMidl2J3PMf3RO6IW D3e3G/1JnLSRQ== From: SJ Park To: Cc: SJ Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH 8/8] mm/damon/sysfs: remove region size validation Date: Wed, 1 Jul 2026 07:48:10 -0700 Message-ID: <20260701144815.113325-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260701144815.113325-1-sj@kernel.org> References: <20260701144815.113325-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 42B614000B X-Rspam-User: X-Stat-Signature: b8dutd57ha3zmbi8kne68jo96g1fn6yo X-HE-Tag: 1782917309-872530 X-HE-Meta: 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 P72dlvn/ /PRQLhmWbfMv1YUr2WJaQLZo+YKSuTVE8PeDhrj4HyaT2z8T/cgoKWBswI33NF+jnlbPoKe8eEpBeOyFrLpzZskyOs0UD1UlGd8aHoZOSRvMWfUjY6h+Bg2w8bYR245TkCtNpitnRoal7P6wihjTSGOFTNHl1QbKV4kdRpjR0OsT3xkzcpSem1Vc68lX4B83refRpTG6pBhEdPcNJwOyqbVhZC+tVETnRkinHpzWv/UV2/9o= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: DAMON_SYSFS validates user inputs for monitoring target regions to disallow negative size regions. DAMON core assumes only positive size regions, though. The validation is incomplete. Fortunately damon_set_regions(), which is eventually used by DAMON_SYSFS, does the complete validation. Remove the incomplete and unnecessary validation. Signed-off-by: SJ Park --- mm/damon/sysfs.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index e666dddf1feba..b65651498e0d1 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -1987,9 +1987,6 @@ static int damon_sysfs_set_regions(struct damon_target *t, struct damon_sysfs_region *sys_region = sysfs_regions->regions_arr[i]; - if (sys_region->ar.start > sys_region->ar.end) - goto out; - ranges[i].start = sys_region->ar.start; ranges[i].end = sys_region->ar.end; if (i == 0) -- 2.47.3