From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 25170CAC58D for ; Wed, 10 Sep 2025 05:33:22 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6F8DD8E001F; Wed, 10 Sep 2025 01:33:21 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6A99F8E0001; Wed, 10 Sep 2025 01:33:21 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 54B568E001F; Wed, 10 Sep 2025 01:33:21 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 3FE398E0001 for ; Wed, 10 Sep 2025 01:33:21 -0400 (EDT) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 111A71A0761 for ; Wed, 10 Sep 2025 05:33:21 +0000 (UTC) X-FDA: 83872222602.11.AF98EF0 Received: from mail-pf1-f182.google.com (mail-pf1-f182.google.com [209.85.210.182]) by imf22.hostedemail.com (Postfix) with ESMTP id 5FEF2C0002 for ; Wed, 10 Sep 2025 05:33:19 +0000 (UTC) Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b=Ezyu8Iy1; spf=pass (imf22.hostedemail.com: domain of wangjinchao600@gmail.com designates 209.85.210.182 as permitted sender) smtp.mailfrom=wangjinchao600@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1757482399; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=C6BBsZfnmfgl1Jgn+pU00vd6g5c1DTmTteWqGp/Sk64=; b=ASCKncvmKlxGUPtMn6aE9zLG+0sfJd378seG6CU2qeO25q57nv5vYt27Sec9YsPC+GeWsW eoMYUHQ63FhfmRGZrHoFxTJFa3/PIAqSiA7NTp8gPCj8j2lVa/dy1gW1iCIkF12qmAp6l4 SN+a5nwF6dgO27wz7fB7unZjGrVhTZk= ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b=Ezyu8Iy1; spf=pass (imf22.hostedemail.com: domain of wangjinchao600@gmail.com designates 209.85.210.182 as permitted sender) smtp.mailfrom=wangjinchao600@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1757482399; a=rsa-sha256; cv=none; b=GQMVzy434K6Dy+iQx2/JvLGUsE4iHoRaSqgTLgP0O/xu6bTe24ZBjw16upu1JHoM7378HJ GGbZMtlGFurjQOtYeHLBz3pQB7XmWYUobyADjVu4KFuIbygNsw5IdNIN84xKYMZmoj2KJJ bndsQ5wWUuXV05nO36DsX4HuSAq3dis= Received: by mail-pf1-f182.google.com with SMTP id d2e1a72fcca58-77459bc5d18so2191498b3a.2 for ; Tue, 09 Sep 2025 22:33:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1757482398; x=1758087198; darn=kvack.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=C6BBsZfnmfgl1Jgn+pU00vd6g5c1DTmTteWqGp/Sk64=; b=Ezyu8Iy1U9Xo28vizNxQQ3NiNx9e4WfcbhN7XS0DknkNNa7tRg9+dzR5rZC1ZRG1dx jsF5y3NlmXirA9o7xMMi2Orl06go/+4uT81P8LlobdjJHLnRrLNEqkT/lX7RuPHHBqUj rtspFtJLbLuZEGejeue5T+7DWFR+cVRVvZqBTy+XE9lH7AyB86D/9dR3MLU12WrqNe0I tD5M49GU8m+7As7ngtLJFWZ2XtlNU419cPguuuJpT3Tb+6uzbumI+u0X/XjwSv/YoRjg BZKKJupYhRIbc4pN6LfC/q4LjAxgtNfRmDSYPohO6aEMKd3AgWO2pc2z/JILeHxhbeJH 4tig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757482398; x=1758087198; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=C6BBsZfnmfgl1Jgn+pU00vd6g5c1DTmTteWqGp/Sk64=; b=XE7+kZQoQWPQTwN0sOC467M/PPRUKMH+uSC+4WG/4mOTt1Rj0ex/YzfNN9GdMQ5i+X risG3/PT/j08u66sdFsybWQHuxbkfSCFPNbEhWRvumxbpAqbhnpTx07Q4PaVFDAAAJMW nxrXJGEbTMKu9X4Sbumf65/9iH1OwaINW8YEeZN+dfFv16lIcx3fOiYXjjvxgAfCKoPL lHFoTHQwCWRh/BdTW3DWpEaAS32LNqqwKVjDR+ax7tVXbl0/9aTcmXhfRCUaLDQfrLoj robyokt+FhzQb73g+xBLRZur5WkCTLxyvbWU77j/eWVmbG6qJrU1+zyAXgvJBYLo1gn7 byfA== X-Forwarded-Encrypted: i=1; AJvYcCXVzIiFVjHZUSTytU8qTqTocDZzZlIG67QxG1X0EdGDIl4CMzWoKuyzmsq/U8EzLuNEG2jaXu9UZA==@kvack.org X-Gm-Message-State: AOJu0YzL/zJ4GWX8YUimcsfcGlN7GGUdlx2vS8f3VEX0sd7r14VpItnv 0y+Q8+SDJk4TXlTw7Ik/HocYeXRDqpKeADZKCXYxMrYpwvy1UaTm+VMi X-Gm-Gg: ASbGncteLV3tnUTPQ6jzEeyKWKRi7uz2fB9JUGPzTJgy9iyetFmdGmB8yTYkLy7Jub6 Vxl9dR7gmJXWlGjC95NX0ubXowI2tZQDALTPskqvrUvKIw6OLn9I1gSZxI0KMH7flqGCIncwGn/ EbhRrP3hk2ny25+cVJffz74pa5pdMgbQAgv7zP4SHFO9VhlNC8RDd8AFd4Q/Xt2s0t90Qtvb6dY VRkZE0q6YBUo2bRKJCbc202LHxCWoCW9JsL762UMPeKKNo+C+b0UcFlHNn2iPexUTn5Ngyy7DFi i4yAsFgXRK5+AnT3+E86NVe8Bykc5KKQnvyXOvhHDrrJPMMMf8JRKh9MsbTP2r59Z/pk4nM1Bh4 IZb/xxKMpYk5X0A/pNIhRRIeJLX4PXOFf7UcmklGgDq5fyC0fvw== X-Google-Smtp-Source: AGHT+IGMlBk1siPf0LdBIVrbWn7aNbl4n5xmBmCjKUDes18u0uAwbv5aGrUaz59gciPqgZoMRDZV0A== X-Received: by 2002:a05:6300:2189:b0:24e:3b70:978c with SMTP id adf61e73a8af0-2534756f62cmr20233577637.59.1757482398166; Tue, 09 Sep 2025 22:33:18 -0700 (PDT) Received: from localhost.localdomain ([45.8.220.62]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7746628ffbesm3870342b3a.66.2025.09.09.22.33.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Sep 2025 22:33:17 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , Peter Zijlstra , Mike Rapoport , "Naveen N . Rao" , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , kasan-dev@googlegroups.com, "David S. Miller" , Steven Rostedt , Mathieu Desnoyers , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Liang, Kan" , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Jinchao Wang Subject: [PATCH v3 15/19] mm/ksw: add stack overflow test Date: Wed, 10 Sep 2025 13:31:13 +0800 Message-ID: <20250910053147.1152253-7-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250910053147.1152253-1-wangjinchao600@gmail.com> References: <20250910052335.1151048-1-wangjinchao600@gmail.com> <20250910053147.1152253-1-wangjinchao600@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 5FEF2C0002 X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: xgqmqh3wgkbp4obdi54k6n9p679wky8c X-HE-Tag: 1757482399-450527 X-HE-Meta: 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 mDs6V3qX WKUep1TW5EO3wxq7Fh1Hs+++0LslaFK53jd4gcFbF3vf3Jx2rjOgdqm0GHIX7qgG5NumH1FNM8kwk36FLnuTQqPve3Lu8wACzH3aWqGZgP3DxeCGKrTUPrAgkv6lzSpFDm9QB X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Extend the test module with a new test case (test1) that intentionally overflows a local u64 buffer to corrupt the stack canary. This helps validate detection of stack corruption under overflow conditions. The proc interface is updated to document the new test: - test1: stack canary overflow test Signed-off-by: Jinchao Wang --- mm/kstackwatch/test.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/mm/kstackwatch/test.c b/mm/kstackwatch/test.c index 76dbfb042067..ab1a3f92b5e8 100644 --- a/mm/kstackwatch/test.c +++ b/mm/kstackwatch/test.c @@ -40,6 +40,27 @@ static void canary_test_write(void) pr_info("canary write test completed\n"); } +/* + * Test Case 1: Stack Overflow (Canary Test) + * This function uses a u64 buffer 64-bit write + * to corrupt the stack canary with a single operation + */ +static void canary_test_overflow(void) +{ + u64 buffer[BUFFER_SIZE]; + + pr_info("starting %s\n", __func__); + pr_info("buffer 0x%lx\n", (unsigned long)buffer); + + /* intentionally overflow the u64 buffer. */ + ((u64 *)buffer + BUFFER_SIZE)[0] = 0xdeadbeefdeadbeef; + + /* make sure the compiler do not drop assign action */ + barrier_data(buffer); + + pr_info("canary overflow test completed\n"); +} + static ssize_t test_proc_write(struct file *file, const char __user *buffer, size_t count, loff_t *pos) { @@ -63,6 +84,10 @@ static ssize_t test_proc_write(struct file *file, const char __user *buffer, pr_info("triggering canary write test\n"); canary_test_write(); break; + case 1: + pr_info("triggering canary overflow test\n"); + canary_test_overflow(); + break; default: pr_err("Unknown test number %d\n", test_num); return -EINVAL; @@ -82,7 +107,8 @@ static ssize_t test_proc_read(struct file *file, char __user *buffer, "KStackWatch Simplified Test Module\n" "==================================\n" "Usage:\n" - " echo 'test0' > /proc/kstackwatch_test - Canary write test\n"; + " echo 'test0' > /proc/kstackwatch_test - Canary write test\n" + " echo 'test1' > /proc/kstackwatch_test - Canary overflow test\n"; return simple_read_from_buffer(buffer, count, pos, usage, strlen(usage)); -- 2.43.0