From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f202.google.com (mail-dy1-f202.google.com [74.125.82.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B39563CBE88 for ; Sat, 11 Apr 2026 19:18:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775935092; cv=none; b=Vk5Q7oP/f5hrB2Vl+lCO2BSHaRPbBlJlAI0i7sZIdzvXpXdgagM+Dlz/cDYTCEdI08xQ8aYO0WsLfti72X/VzAulGN60BSr7LMo0QlXRb+ionh7K/5V729sZXIbJDWEtX4YoWq77gcMWs71ssIJ6Wg8Tf2gUlH+VmOQo16XX4x0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775935092; c=relaxed/simple; bh=TORHr2hwj56t1K+9uUsjLQo6KHkuVY+QoSlV3b0luUk=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=HeDJAW9pbFvPBgccjV5uHkrUX9eIQwW8ol+NO4j1pqMcNG3smlx+GVpINHXO7+uPZ2aqvo6Ixl/Hq4g0AF5fQm3xMJpK5y36q8L7di75EWClkmtFPi+iq1OFaBUOnglw1C03vKzPWqgcT0fyrpKHvnN48dVtoYw02GIFX2YeIwc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=Bjhfv6bf; arc=none smtp.client-ip=74.125.82.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Bjhfv6bf" Received: by mail-dy1-f202.google.com with SMTP id 5a478bee46e88-2c0f6593ef5so4389447eec.1 for ; Sat, 11 Apr 2026 12:18:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1775935091; x=1776539891; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=hQS4P5hyltqhKwRzLCXyq1MWFkkdWjplTUZAMK0ialE=; b=Bjhfv6bfCF2JEt7F4z9jrZBdTq+aJC7ruU0/Rfu0HOyUuRm4aXz5ECrxR1uvOyBuph 6ftrVTVE3sDcgXKj/+eZ7sQGdtKNPVIxTYx4kNy/ZWOu1pU8sDJJMY+Wqd+fKzjrUq7G +oehOtdJL9vPN77C0/bI6mri0uQJKZrozWbT3pVKQnr7KHIi7M5H64cVrudvCxRmIWjt SXIcimQsMbV0ezGVW9wsCBQvVWXYzanifssYmsO/IluwAxqkd86/pHYIzsBAzLi54r4Q LClKQI91TkLbMcPa9zE2vV6tYVNfdIBqmfSqDudDcfRAqkcxazpKBnP7LN4gerBFpyMM ohig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775935091; x=1776539891; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=hQS4P5hyltqhKwRzLCXyq1MWFkkdWjplTUZAMK0ialE=; b=Fqh8jxR7hfO9kgpcqVLos+rwvsgiinplsZcLthk4GGhgQGu9IwCXp6Fw0Hu+B/5dKk AJJwTF0yYIlQmMM/SGXnt16bjex68KRsIU/eWvYgwWer4l5rmdp/hdPB37bjzlBHzTbE LrQTobE3PuiJrygzd/TV/0EGap7C5auJC/+fgtwJxrXhrNhEqscFL3Q5CFwVdxKINKKN JJPN/ABmY2dabYFvEm2m0q4J1UE5mpMZTKW5JrVoULGSDduGphhH7JsVhbl3q4TRvibN K2rAE21s7ipC5uPwSmRKZZxH3Vu0eyNkT6s3LLZ6eqfs9uEpdOlw+KDsfMfZ9fHPcmf3 FTGw== X-Forwarded-Encrypted: i=1; AFNElJ+VS8+cOyEB/9eO1vfROZNnVI13n/mHvge9NYiaNSC496XfI11snWK5ar+XYq+0C8YXDwDdeU6ayDgkteQ=@vger.kernel.org X-Gm-Message-State: AOJu0YzsMLkpTjJq5cRgHrX0WEFo6Kb4vZSk5vabZLK1bJe17hrCM0Wa lMIVYzys/Jd6cMOhZadcEsQtdfDqVF44g8vRbDPOQd9qk7kvgKAXeVpRoQ5Dyhq0jwlAPtp0i/N c9Hftg3aZZw== X-Received: from dycmm14.prod.google.com ([2002:a05:693c:260e:b0:2d1:6536:ac9e]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7300:e2cc:b0:2c1:7793:7bbb with SMTP id 5a478bee46e88-2d5898a59fdmr4772124eec.27.1775935090639; Sat, 11 Apr 2026 12:18:10 -0700 (PDT) Date: Sat, 11 Apr 2026 12:17:05 -0700 In-Reply-To: <20260411191710.524998-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260411065718.372240-1-irogers@google.com> <20260411191710.524998-1-irogers@google.com> X-Mailer: git-send-email 2.53.0.1213.gd9a14994de-goog Message-ID: <20260411191710.524998-25-irogers@google.com> Subject: [PATCH v9 24/29] perf kmem: Add bounds checks to tracepoint read values From: Ian Rogers To: namhyung@kernel.org Cc: irogers@google.com, acme@kernel.org, adrian.hunter@intel.com, ajones@ventanamicro.com, ak@linux.intel.com, alex@ghiti.fr, alexander.shishkin@linux.intel.com, anup@brainfault.org, aou@eecs.berkeley.edu, atrajeev@linux.ibm.com, blakejones@google.com, ctshao@google.com, dapeng1.mi@linux.intel.com, derek.foreman@collabora.com, dvyukov@google.com, howardchu95@gmail.com, hrishikesh123s@gmail.com, james.clark@linaro.org, jolsa@kernel.org, krzysztof.m.lopatowski@gmail.com, leo.yan@arm.com, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux@treblig.org, mingo@redhat.com, nichen@iscas.ac.cn, palmer@dabbelt.com, peterz@infradead.org, pjw@kernel.org, ravi.bangoria@amd.com, swapnil.sapkal@amd.com, tanze@kylinos.cn, thomas.falcon@intel.com, tianyou.li@intel.com, yujie.liu@intel.com, zhouquan@iscas.ac.cn Content-Type: text/plain; charset="UTF-8" Avoid out-of-bound memory accesses by bound checking order and migrate_type when coming from page_alloc_event and page_free_event. Signed-off-by: Ian Rogers --- tools/perf/builtin-kmem.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c index daf2272c7337..33585e353efe 100644 --- a/tools/perf/builtin-kmem.c +++ b/tools/perf/builtin-kmem.c @@ -826,6 +826,16 @@ static int evsel__process_page_alloc_event(struct perf_sample *sample) .migrate_type = migrate_type, }; + if (order >= MAX_PAGE_ORDER) { + pr_debug("Out-of-bounds order %u\n", order); + return -1; + } + + if (migrate_type >= MAX_MIGRATE_TYPES) { + pr_debug("Out-of-bounds migratetype %u\n", migrate_type); + return -1; + } + if (use_pfn) page = perf_sample__intval(sample, "pfn"); else @@ -892,6 +902,11 @@ static int evsel__process_page_free_event(struct perf_sample *sample) .order = order, }; + if (order >= MAX_PAGE_ORDER) { + pr_debug("Out-of-bounds order %u\n", order); + return -1; + } + if (use_pfn) page = perf_sample__intval(sample, "pfn"); else -- 2.53.0.1213.gd9a14994de-goog