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([145.224.119.89]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-624841586c1sm1302244d50.6.2025.09.12.08.10.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Sep 2025 08:11:02 -0700 (PDT) From: Eugen Hristev To: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, tglx@linutronix.de, andersson@kernel.org, pmladek@suse.com, rdunlap@infradead.org, corbet@lwn.net, david@redhat.com, mhocko@suse.com Cc: tudor.ambarus@linaro.org, mukesh.ojha@oss.qualcomm.com, linux-arm-kernel@lists.infradead.org, linux-hardening@vger.kernel.org, jonechou@google.com, rostedt@goodmis.org, linux-doc@vger.kernel.org, devicetree@vger.kernel.org, Eugen Hristev Subject: [RFC][PATCH v3 14/16] kernel/vmcoreinfo: Register kmemdump core image information Date: Fri, 12 Sep 2025 18:08:53 +0300 Message-ID: <20250912150855.2901211-15-eugen.hristev@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250912150855.2901211-1-eugen.hristev@linaro.org> References: <20250912150855.2901211-1-eugen.hristev@linaro.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The coreimage generated by kmemdump requires some kernel information in order to be successfully loaded by `crash` or gdb. Register all this information through vmcoreinfo once vmcoreinfo is setup. Signed-off-by: Eugen Hristev --- kernel/vmcore_info.c | 141 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 141 insertions(+) diff --git a/kernel/vmcore_info.c b/kernel/vmcore_info.c index 3e2e846ba9c8..1d83e95cf9be 100644 --- a/kernel/vmcore_info.c +++ b/kernel/vmcore_info.c @@ -15,6 +15,7 @@ #include #include #include +#include =20 #include #include @@ -24,6 +25,17 @@ #include "kallsyms_internal.h" #include "kexec_internal.h" =20 +void sched_get_runqueues_area(void **start, size_t *size); + +extern unsigned int nr_irqs; +extern unsigned long tainted_mask; +extern unsigned int nr_swapfiles; + +#ifdef CONFIG_IKCONFIG_PROC +extern char kernel_config_data; +extern char kernel_config_data_end; +#endif + /* vmcoreinfo stuff */ unsigned char *vmcoreinfo_data; size_t vmcoreinfo_size; @@ -121,8 +133,137 @@ EXPORT_SYMBOL(paddr_vmcoreinfo_note); =20 static void vmcoreinfo_kmemdump(void) { + void *start; + size_t size; + int i; + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_VMCOREINFO, (void *)vmcoreinfo_data, vmcoreinfo_size); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_linux_banner, + (void *)&linux_banner, banner_len); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_init_uts_ns, + (void *)&init_uts_ns, sizeof(init_uts_ns)); + + sched_get_runqueues_area(&start, &size); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_runqueues, + (void *)start, size); + +#ifdef CONFIG_IKCONFIG_PROC + /* Register 8 bytes before and after, to catch the marker too */ + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_CONFIG, + (void *)&kernel_config_data - 8, + &kernel_config_data_end - &kernel_config_data + 16); +#endif + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE___cpu_possible_mask, + (void *)&__cpu_possible_mask, + sizeof(__cpu_possible_mask)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE___cpu_active_mask, + (void *)&__cpu_active_mask, + sizeof(__cpu_active_mask)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE___cpu_online_mask, + (void *)&__cpu_online_mask, + sizeof(__cpu_online_mask)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE___cpu_present_mask, + (void *)&__cpu_present_mask, + sizeof(__cpu_present_mask)); + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_nr_irqs, + (void *)&nr_irqs, sizeof(nr_irqs)); + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_tainted_mask, + (void *)&tainted_mask, sizeof(tainted_mask)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_taint_flags, + (void *)&taint_flags, sizeof(taint_flags)); + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_jiffies_64, + (void *)&jiffies_64, sizeof(jiffies_64)); + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_nr_threads, + (void *)&nr_threads, sizeof(nr_threads)); + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_node_states, + (void *)&node_states, sizeof(node_states)); + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_init_mm, + (void *)&init_mm, sizeof(init_mm)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_init_mm_pgd, + (void *)&init_mm.pgd, sizeof(*init_mm.pgd)); + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE__totalram_pages, + (void *)&_totalram_pages, sizeof(_totalram_pages)); + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_nr_swapfiles, + (void *)&nr_swapfiles, sizeof(nr_swapfiles)); + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE___per_cpu_offset, + (void *)&__per_cpu_offset, sizeof(__per_cpu_offset)); + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_high_memory, + (void *)&high_memory, sizeof(high_memory)); +#ifdef CONFIG_NUMA + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_node_data, + (void *)&node_data, + MAX_NUMNODES * sizeof(struct pglist_data)); + + for (i =3D 0; i < MAX_NUMNODES; i++) { + if (!NODE_DATA(i)) + continue; + kmemdump_register((void *)NODE_DATA(i), + roundup(sizeof(pg_data_t), SMP_CACHE_BYTES)); + } +#endif + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_mem_section, + (void *)&mem_section, sizeof(mem_section)); + for (i =3D 0; i < NR_SECTION_ROOTS; i++) { + if (!mem_section[i]) + continue; + kmemdump_register((void *)mem_section[i], + SECTIONS_PER_ROOT * sizeof(struct mem_section)); + } + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_MEMSECT, + (void *)mem_section, + sizeof(struct mem_section *) * NR_SECTION_ROOTS); + + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_kallsyms_num_syms, + (void *)&kallsyms_num_syms, + sizeof(kallsyms_num_syms)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_kallsyms_relative_base, + (void *)&kallsyms_relative_base, + sizeof(kallsyms_relative_base)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_kallsyms_offsets, + (void *)&kallsyms_offsets, + sizeof(&kallsyms_offsets)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_kallsyms_names, + (void *)&kallsyms_names, + sizeof(&kallsyms_names)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_kallsyms_token_table, + (void *)&kallsyms_token_table, + sizeof(&kallsyms_token_table)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_kallsyms_token_index, + (void *)&kallsyms_token_index, + sizeof(&kallsyms_token_index)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_kallsyms_markers, + (void *)&kallsyms_markers, + sizeof(&kallsyms_markers)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_kallsyms_seqs_of_names, + (void *)&kallsyms_seqs_of_names, + sizeof(&kallsyms_seqs_of_names)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE__sinittext, + (void *)&_sinittext, sizeof(&_sinittext)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE__einittext, + (void *)&_einittext, sizeof(&_einittext)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE__end, + (void *)&_end, sizeof(&_end)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE__text, + (void *)&_text, sizeof(&_text)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE__stext, + (void *)&_stext, sizeof(&_stext)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE__etext, + (void *)&_etext, sizeof(&_etext)); + kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_swapper_pg_dir, + (void *)&swapper_pg_dir, sizeof(&swapper_pg_dir)); } =20 static int __init crash_save_vmcoreinfo_init(void) --=20 2.43.0