From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f179.google.com (mail-pg1-f179.google.com [209.85.215.179]) (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 E841A2E8DFC for ; Fri, 12 Sep 2025 10:12:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.179 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757671953; cv=none; b=pEl4+hSlOiTwEg8wdMX/mLQqJaJNZdgBNZmEAB6R1c/KinjgE9dQlXqIrFpQ6OHUK9CMzbEWrF7UEmyHXT3/Inp/pYS2r4XAGecf+XG/eOzeYaK4gfqCgQPSIcBx52CUhE5mJ7wNhU0Ly8CGAt0XUkyjeqqmgbLhDDXtUj64xes= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757671953; c=relaxed/simple; bh=0LDaB0nCUJks9qfGHQUupDX5ghXvVPG655pHEUpPv0Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ONk+xPDp03W6uruXMbXYRKOGTjCsWZZtgfOcWQNtPaymn9pTmUq0bbKNLgp+YR8R53SvOYdp4tkvuI/LoJPdlN4/dFY4fBBGf7cFkbHCy2Qg6OtRPutwXzhFRi50QTY/FKMmyykHp4gnSkfiUWKoxHoVqs608SSIUsNf0gm0G8A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=YVqx/HMc; arc=none smtp.client-ip=209.85.215.179 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="YVqx/HMc" Received: by mail-pg1-f179.google.com with SMTP id 41be03b00d2f7-b4c3d8bd21eso1114585a12.2 for ; Fri, 12 Sep 2025 03:12:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1757671951; x=1758276751; darn=vger.kernel.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=J0CmyIyII1+MjAJi7HJRtv0YVAXaAwAF3MNYXoEmi5A=; b=YVqx/HMcx4WSO9i1YtOiiV7Z3RYtwePGk3ADWg3kZQ9pySyLlQhj3snXhTpJEx957w srGpnBdxagEBUTvLsPLQJewwbBYn7iWjj4/v0ayowKE2WoalDMmvhyuZdDam2JEsawor hk0EutrTk4+v9xlH/63Ub6gGLU2bqMw0qaJwKNuTXWRaoNhkVlCuTnRYVVuN8pqlhIlM K3/QMkQpDQ5J8XrQRM7fULzrOm34WCUgmaI6OS9LLYuNSu/8bFMlIW7TGsZyqaiSEjFE oVC29mNNaEa+kxkVYn9FuSevElViV1F3l/dHiCnoF+ibYOYYgPWCZ0fWA46ALLAg+isW tmJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757671951; x=1758276751; 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=J0CmyIyII1+MjAJi7HJRtv0YVAXaAwAF3MNYXoEmi5A=; b=DpRFoV/j7Eu31JW5IAdatHJC2MgcJ5VqSlQr/STmOhGaJLvkiFrQ2ZBPSNHr1N6Pfh oKZgAnY+Mjot+xdb/R93oWJsPV4VTKHcVsNB5iDM1KLB0RKgFJMm52Pfv0gDOCjPzFMi P0OpLbuC4kqwh4VF+51aZ9/EB94Mz9wScC6Ce6lI54Uz/Wqjf3Bs6l2EOAzZ0L4LLJkM LParpTE4m3VBVJzoTjwhyIiUbj1ZrWklLLtcHMRlS99o2PxHVLrR7f5DdMoQfRK1gKPA 1PDM06vmCEgbEQPwgyLqLr689dLIJlYCBAlpDLZKhXTh8++9oytFPeq0cfq51YxWmV3J vi9g== X-Forwarded-Encrypted: i=1; AJvYcCVjTfBh5qK+74uBxvx9Hz480bjIhuJuhJBd8yBTmh7C75k9/LGkKy89xpJRC/SlVeDVwtTmCkphWB045/NH201s@vger.kernel.org X-Gm-Message-State: AOJu0Yy2Cj/+dt0XK/SgVuacFMWRVTyVktjXA5AaBCu3RblBto/smVKu W2tyuHJIClQl5T29m8rJ/VFK7PRLEiyrKwyNdSNXaWnb7GL1k7hMyDp0 X-Gm-Gg: ASbGnctkkhgFrQ/BEzLr5rLolOma7R75HiL/STAnJZoiM7nGiNaPygPV3S5yqNZ+pgc /IVTKUu3YPQVa8Vmo8aT410oZFG+QeR4EGjqQF1eQJshdUChqvNla0Mf+ZfH9WftxM2hwBkYYq1 RMZbq9SCOpgg2QBWV4VyukMui7KhILWPCcXsqIU81pp0VwQx/9Cm/45r5OEGv2shmYnuhU7UGnj aHr1p8EBTZIX760tqDKURYTU0upf68BfBzYhMGIiI8U4/5fulIUmDZpmEN/cDqupnSMEbFficzi GhkZOLArBvjYstPnSz6RQBNfAe3gTGs3nti8YAWYr9HfsLdAYCBQZsjDideV7Z596lcgMmFn5oC NuG5aI73JWVR82q0mC7QuVCGJO7exYw/76F6k/bY= X-Google-Smtp-Source: AGHT+IF00yk89VG+lmEZt4lMLX0bbsabe7ZkX4XQg7tfyuz6vAWZHryAYuUydwk9sktzZqpEFk926w== X-Received: by 2002:a17:903:3c2c:b0:24b:2b07:5fa5 with SMTP id d9443c01a7336-25d26663dcamr29087525ad.29.1757671951122; Fri, 12 Sep 2025 03:12:31 -0700 (PDT) Received: from localhost ([185.49.34.62]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-25c3b4f1127sm44400285ad.147.2025.09.12.03.12.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Sep 2025 03:12:30 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , Peter Zijlstra , Mike Rapoport , Alexander Potapenko , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Liang, Kan" , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Kees Cook , Alice Ryhl , Sami Tolvanen , Miguel Ojeda , Masahiro Yamada , Rong Xu , Naveen N Rao , David Kaplan , Andrii Nakryiko , Jinjie Ruan , Nam Cao , workflows@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, Andrey Ryabinin , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , kasan-dev@googlegroups.com, "David S. Miller" , Mathieu Desnoyers , linux-trace-kernel@vger.kernel.org Cc: Jinchao Wang Subject: [PATCH v4 07/21] mm/ksw: add HWBP pre-allocation Date: Fri, 12 Sep 2025 18:11:17 +0800 Message-ID: <20250912101145.465708-8-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250912101145.465708-1-wangjinchao600@gmail.com> References: <20250912101145.465708-1-wangjinchao600@gmail.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Pre-allocate per-CPU hardware breakpoints at init with a place holder address, which will be retargeted dynamically in kprobe handler. This avoids allocation in atomic context. Signed-off-by: Jinchao Wang --- mm/kstackwatch/kstackwatch.h | 4 +++ mm/kstackwatch/watch.c | 55 ++++++++++++++++++++++++++++++++++++ 2 files changed, 59 insertions(+) diff --git a/mm/kstackwatch/kstackwatch.h b/mm/kstackwatch/kstackwatch.h index 277b192f80fa..3ea191370970 100644 --- a/mm/kstackwatch/kstackwatch.h +++ b/mm/kstackwatch/kstackwatch.h @@ -38,4 +38,8 @@ struct ksw_config { // singleton, only modified in kernel.c const struct ksw_config *ksw_get_config(void); +/* watch management */ +int ksw_watch_init(void); +void ksw_watch_exit(void); + #endif /* _KSTACKWATCH_H */ diff --git a/mm/kstackwatch/watch.c b/mm/kstackwatch/watch.c index cec594032515..d3399ac840b2 100644 --- a/mm/kstackwatch/watch.c +++ b/mm/kstackwatch/watch.c @@ -1 +1,56 @@ // SPDX-License-Identifier: GPL-2.0 +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include + +#include "kstackwatch.h" + +static struct perf_event *__percpu *watch_events; + +static unsigned long watch_holder; + +static struct perf_event_attr watch_attr; + +bool panic_on_catch; +module_param(panic_on_catch, bool, 0644); +MODULE_PARM_DESC(panic_on_catch, "panic immediately on corruption catch"); +static void ksw_watch_handler(struct perf_event *bp, + struct perf_sample_data *data, + struct pt_regs *regs) +{ + pr_err("========== KStackWatch: Caught stack corruption =======\n"); + pr_err("config %s\n", ksw_get_config()->config_str); + dump_stack(); + pr_err("=================== KStackWatch End ===================\n"); + + if (panic_on_catch) + panic("Stack corruption detected"); +} + +int ksw_watch_init(void) +{ + int ret; + + hw_breakpoint_init(&watch_attr); + watch_attr.bp_addr = (unsigned long)&watch_holder; + watch_attr.bp_len = sizeof(watch_holder); + watch_attr.bp_type = HW_BREAKPOINT_W; + watch_events = register_wide_hw_breakpoint(&watch_attr, + ksw_watch_handler, + NULL); + if (IS_ERR(watch_events)) { + ret = PTR_ERR(watch_events); + pr_err("failed to register wide hw breakpoint: %d\n", ret); + return ret; + } + + return 0; +} + +void ksw_watch_exit(void) +{ + unregister_wide_hw_breakpoint(watch_events); + watch_events = NULL; +} -- 2.43.0