From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A85984A3406; Wed, 29 Jul 2026 14:03:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785333785; cv=none; b=LY4G9dBFw3dS+N3xSuWo8b3Y4m/hrfNNKehsFMPwrvkP94P59PLXdVIIBkPdkleevVQYpg73c79iLIGBk9/IgmqP62+p05Djs1Sk8g6Md8yX6FXtI6/Uthbrz9yxq7yU3RVHO9yNmw3ocDBJ1828kJEaYLmYhTQS2KiWl1p2Lts= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785333785; c=relaxed/simple; bh=7aj0HHIF0FmLDvA7ZUTRMPVQm2v2FlKqXF7k67yMB/w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uu/bY8RZ+NvK5J7NEWJQOKDevk4TTB4Yy+Ldf6xHjoSMEeeO1GxfHo8Oocm9qu+504GlbI6OzDNQRzHshGqewzV6zPFiBD9hwyLksKiMOT5dQX5v08wODitGTLg+BeNEqUmNJ1O+WCtA4UTjcRfHAULrGzWHk7t5jJJt78QLy4o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Z3bsZJLH; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Z3bsZJLH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 66B601F000E9; Wed, 29 Jul 2026 14:03:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785333784; bh=l6Gzj2O2XUAR6lep0wUa1dFLYISIw0l2rjfScnnYsJA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Z3bsZJLHYCQzwZO54/ElaLeyhDf/2VAfVGWP6UskqGjo6BDeL9kwYAE3utoKcmDQK GHhtYksSfyTl3gjLZWz2dehrtDJp4ROmjUZk2R8KlVYGJwPYVol7nwsFLgYhEZuMTg uekn/PmSjZO6Yj21tF7cR+GCB7vRCkGw55dTjxk3SCd9uvNulE+RuL8V9Lr9yAk5Ia u+CY6ixLAPKnwvYW10VR4dHKaqMtSrxKFUW9xCsE5bauDEMvycJFalKuNLB8eYDizr txwrEJzy9fGaGMhRtEX25lZRDGxQcDOuBgoxkNNZYswROFE8zwxqVSMMwd3E1Ln6b1 I7Jx53ncKsmLw== 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 v1.2 04/12] mm/damon/core: validate number of probes in valid_probe_params() Date: Wed, 29 Jul 2026 07:02:44 -0700 Message-ID: <20260729140253.87753-5-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260729140253.87753-1-sj@kernel.org> References: <20260729140253.87753-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Each DAMON context is allowed to have only up to DAMON_MAX_PROBES probes. The central place for validating DAMON probe parameters, damon_valid_probe_params(), is not validating the upper limit, though. Do the validation. Signed-off-by: SJ Park --- mm/damon/core.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/damon/core.c b/mm/damon/core.c index 1b0f12d17de3a..07f4e7126397b 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1401,6 +1401,13 @@ static bool damon_valid_probe_params(struct damon_ctx *ctx) unsigned char max_probe_hits; struct damon_probe *probe; unsigned int wsum, wsum_to_add; + int nr_probes; + + nr_probes = 0; + damon_for_each_probe(probe, ctx) + nr_probes++; + if (nr_probes > DAMON_MAX_PROBES) + return false; if (!damon_has_probe_weights(ctx)) return true; -- 2.47.3