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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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 4B0A0180004 X-Stat-Signature: u43kfysk1dtt5zz1td9ay1yf3hpkciac X-HE-Tag: 1757671952-851510 X-HE-Meta: U2FsdGVkX1+OI5QlFYVKCZiu6j+z8LoUrgWAkLfnJ/xw5FMWqVPttgxncTreCWBXDD3l8kHqRXC9Xy4uf5gxO/t5z3I3gTQZpWLuY0Q3ZI1srpa7DpqCLkQ7RjE4NaBuerfUo5/qtobhw7y6GSWe/fea17ocQkn25kzpZjUCl111c56cnOlXA/uZFEdJ1iiIyL5dUXB/FuaDvbnQ7j+xrIBNC0MeO6HwDLlfZtOc3zZaurADNP3iln7pQ3eZ7hIv+LSup+86jukJL7k5UWEfevINLcDiSArfvuuacVdoziIrp9pwMRU6lFRQMGGagaDj9kYc5SLudM7znQgmIkDB0KEFdEpKFU8JAdVTOgN6X3iaJZGiDhQ3bxtHy4SQmBkrh8PbzfHkJbfJINxm/1uC7JWeZ6ayTA9dvJ+6dWRLUVw0qj4FxE/GhF1QJ1NqCGCOqpTtJOa05Glyg1RTKoGQaBcJrfdWDl9liRusB2Yl+s766dbGASe0SYULAlahivRZqTFNpdHGdq7xTzFCPSF4j4ZLumzFNsLzsBQ5C+h61WnLHnCfDgBA9ZZ2bZ63vvWbrUxzRWyZmxpuebac2YVOPEzq8eMMxU+DEAPE+RPaY+Ckjkcesu6o2nV5BKK4LNYEmjvrwvDQ3Ithdd8w6AiEfidgsC6wumm2/ef6CbZ2YMpHonorrH7+/euy137PPUqxmRniZXxCt7Ll+OmUDRj08Yf6hdart8A3q2LyqWKHLU17H9s6gO5CvriOuMue0cTsniWgMK4cZWhow/cy0RIhTD4UYru0Akx56UEWp5nQnSjfrn3bgzo2j+x6wCSVVW8d5queLlozTB3wMLrsa2gr0iR2F1h7askM68B60UN9mKQzRViIItt1ZwDlCaKQPpAd8GS/XhpAXAtEfuoqOaOCZsmvczsb2pL03/iSb6Yu7/Q69/WISIq123gXNlgLuVd+KtoV/6OBL0jjsYrqf5w 9/UR5SMv 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 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: 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