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[220.132.236.182]) by smtp.gmail.com with ESMTPSA id i187sm15124648pfg.33.2020.03.24.00.31.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2020 00:31:10 -0700 (PDT) From: Zong Li To: palmer@dabbelt.com, paul.walmsley@sifive.com, alex@ghiti.fr, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH RFC 8/8] riscv/kaslr: dump out kernel offset information on panic Date: Tue, 24 Mar 2020 15:30:53 +0800 Message-Id: X-Mailer: git-send-email 2.25.2 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200324_003112_393406_AA7572FD X-CRM114-Status: UNSURE ( 7.69 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:1043 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Zong Li Sender: "linux-riscv" Errors-To: linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org Dump out the kernel offset when panic to help debug kernel. Signed-off-by: Zong Li --- arch/riscv/kernel/setup.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index 913d25e4b9fa..3ce50bf628ba 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -85,3 +85,26 @@ void __init setup_arch(char **cmdline_p) riscv_fill_hwcap(); } + +static int dump_kernel_offset(struct notifier_block *self, unsigned long v, + void *p) +{ + pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n", + get_kaslr_offset(), PAGE_OFFSET); + + return 0; +} + +static struct notifier_block kernel_offset_notifier = { + .notifier_call = dump_kernel_offset +}; + +static int __init register_kernel_offset_dumper(void) +{ + if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && get_kaslr_offset() > 0) + atomic_notifier_chain_register(&panic_notifier_list, + &kernel_offset_notifier); + + return 0; +} +__initcall(register_kernel_offset_dumper);