Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/proc/kcore.c kernel ELF core dumper |
| 3 | * |
| 4 | * Modelled on fs/exec.c:aout_core_dump() |
| 5 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> |
| 6 | * ELF version written by David Howells <David.Howells@nexor.co.uk> |
| 7 | * Modified and incorporated into 2.3.x by Tigran Aivazian <tigran@veritas.com> |
| 8 | * Support to dump vmalloc'd areas (ELF only), Tigran Aivazian <tigran@veritas.com> |
| 9 | * Safe accesses to vmalloc/direct-mapped discontiguous areas, Kanoj Sarcar <kanoj@sgi.com> |
| 10 | */ |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/mm.h> |
| 13 | #include <linux/proc_fs.h> |
David Howells | 2f96b8c | 2013-04-12 00:10:25 +0100 | [diff] [blame] | 14 | #include <linux/kcore.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/user.h> |
Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 16 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/elf.h> |
| 18 | #include <linux/elfcore.h> |
Andrew Morton | 3c743a7 | 2013-04-29 15:08:08 -0700 | [diff] [blame] | 19 | #include <linux/notifier.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/vmalloc.h> |
| 21 | #include <linux/highmem.h> |
Andrew Morton | 87ebdc0 | 2013-02-27 17:03:16 -0800 | [diff] [blame] | 22 | #include <linux/printk.h> |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 23 | #include <linux/bootmem.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/init.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 25 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/uaccess.h> |
| 27 | #include <asm/io.h> |
KAMEZAWA Hiroyuki | 2ef43ec | 2009-09-22 16:45:41 -0700 | [diff] [blame] | 28 | #include <linux/list.h> |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 29 | #include <linux/ioport.h> |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 30 | #include <linux/memory.h> |
KAMEZAWA Hiroyuki | 9492587 | 2009-09-22 16:45:45 -0700 | [diff] [blame] | 31 | #include <asm/sections.h> |
David Howells | 59d8053 | 2013-04-11 13:34:43 +0100 | [diff] [blame] | 32 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Magnus Damm | 3602760 | 2006-12-06 20:38:00 -0800 | [diff] [blame] | 34 | #define CORE_STR "CORE" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Edgar E. Iglesias | 79885b2 | 2008-07-25 01:48:10 -0700 | [diff] [blame] | 36 | #ifndef ELF_CORE_EFLAGS |
| 37 | #define ELF_CORE_EFLAGS 0 |
| 38 | #endif |
| 39 | |
Alexey Dobriyan | 97ce5d6 | 2008-10-06 14:14:19 +0400 | [diff] [blame] | 40 | static struct proc_dir_entry *proc_root_kcore; |
| 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | #ifndef kc_vaddr_to_offset |
| 44 | #define kc_vaddr_to_offset(v) ((v) - PAGE_OFFSET) |
| 45 | #endif |
| 46 | #ifndef kc_offset_to_vaddr |
| 47 | #define kc_offset_to_vaddr(o) ((o) + PAGE_OFFSET) |
| 48 | #endif |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | /* An ELF note in memory */ |
| 51 | struct memelfnote |
| 52 | { |
| 53 | const char *name; |
| 54 | int type; |
| 55 | unsigned int datasz; |
| 56 | void *data; |
| 57 | }; |
| 58 | |
KAMEZAWA Hiroyuki | 2ef43ec | 2009-09-22 16:45:41 -0700 | [diff] [blame] | 59 | static LIST_HEAD(kclist_head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | static DEFINE_RWLOCK(kclist_lock); |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 61 | static int kcore_need_update = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | void |
KAMEZAWA Hiroyuki | c30bb2a | 2009-09-22 16:45:43 -0700 | [diff] [blame] | 64 | kclist_add(struct kcore_list *new, void *addr, size_t size, int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | { |
| 66 | new->addr = (unsigned long)addr; |
| 67 | new->size = size; |
KAMEZAWA Hiroyuki | c30bb2a | 2009-09-22 16:45:43 -0700 | [diff] [blame] | 68 | new->type = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
| 70 | write_lock(&kclist_lock); |
KAMEZAWA Hiroyuki | 2ef43ec | 2009-09-22 16:45:41 -0700 | [diff] [blame] | 71 | list_add_tail(&new->list, &kclist_head); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | write_unlock(&kclist_lock); |
| 73 | } |
| 74 | |
| 75 | static size_t get_kcore_size(int *nphdr, size_t *elf_buflen) |
| 76 | { |
| 77 | size_t try, size; |
| 78 | struct kcore_list *m; |
| 79 | |
| 80 | *nphdr = 1; /* PT_NOTE */ |
| 81 | size = 0; |
| 82 | |
KAMEZAWA Hiroyuki | 2ef43ec | 2009-09-22 16:45:41 -0700 | [diff] [blame] | 83 | list_for_each_entry(m, &kclist_head, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | try = kc_vaddr_to_offset((size_t)m->addr + m->size); |
| 85 | if (try > size) |
| 86 | size = try; |
| 87 | *nphdr = *nphdr + 1; |
| 88 | } |
| 89 | *elf_buflen = sizeof(struct elfhdr) + |
| 90 | (*nphdr + 2)*sizeof(struct elf_phdr) + |
Magnus Damm | 3602760 | 2006-12-06 20:38:00 -0800 | [diff] [blame] | 91 | 3 * ((sizeof(struct elf_note)) + |
| 92 | roundup(sizeof(CORE_STR), 4)) + |
| 93 | roundup(sizeof(struct elf_prstatus), 4) + |
| 94 | roundup(sizeof(struct elf_prpsinfo), 4) + |
| 95 | roundup(sizeof(struct task_struct), 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | *elf_buflen = PAGE_ALIGN(*elf_buflen); |
| 97 | return size + *elf_buflen; |
| 98 | } |
| 99 | |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 100 | static void free_kclist_ents(struct list_head *head) |
| 101 | { |
| 102 | struct kcore_list *tmp, *pos; |
| 103 | |
| 104 | list_for_each_entry_safe(pos, tmp, head, list) { |
| 105 | list_del(&pos->list); |
| 106 | kfree(pos); |
| 107 | } |
| 108 | } |
| 109 | /* |
KAMEZAWA Hiroyuki | 26562c5 | 2009-09-22 16:45:49 -0700 | [diff] [blame] | 110 | * Replace all KCORE_RAM/KCORE_VMEMMAP information with passed list. |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 111 | */ |
| 112 | static void __kcore_update_ram(struct list_head *list) |
| 113 | { |
KAMEZAWA Hiroyuki | 678ad5d | 2009-09-22 16:45:51 -0700 | [diff] [blame] | 114 | int nphdr; |
| 115 | size_t size; |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 116 | struct kcore_list *tmp, *pos; |
| 117 | LIST_HEAD(garbage); |
| 118 | |
| 119 | write_lock(&kclist_lock); |
| 120 | if (kcore_need_update) { |
| 121 | list_for_each_entry_safe(pos, tmp, &kclist_head, list) { |
KAMEZAWA Hiroyuki | 26562c5 | 2009-09-22 16:45:49 -0700 | [diff] [blame] | 122 | if (pos->type == KCORE_RAM |
| 123 | || pos->type == KCORE_VMEMMAP) |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 124 | list_move(&pos->list, &garbage); |
| 125 | } |
| 126 | list_splice_tail(list, &kclist_head); |
| 127 | } else |
| 128 | list_splice(list, &garbage); |
| 129 | kcore_need_update = 0; |
KAMEZAWA Hiroyuki | 678ad5d | 2009-09-22 16:45:51 -0700 | [diff] [blame] | 130 | proc_root_kcore->size = get_kcore_size(&nphdr, &size); |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 131 | write_unlock(&kclist_lock); |
| 132 | |
| 133 | free_kclist_ents(&garbage); |
| 134 | } |
| 135 | |
| 136 | |
| 137 | #ifdef CONFIG_HIGHMEM |
| 138 | /* |
| 139 | * If no highmem, we can assume [0...max_low_pfn) continuous range of memory |
| 140 | * because memory hole is not as big as !HIGHMEM case. |
| 141 | * (HIGHMEM is special because part of memory is _invisible_ from the kernel.) |
| 142 | */ |
| 143 | static int kcore_update_ram(void) |
| 144 | { |
| 145 | LIST_HEAD(head); |
| 146 | struct kcore_list *ent; |
| 147 | int ret = 0; |
| 148 | |
| 149 | ent = kmalloc(sizeof(*ent), GFP_KERNEL); |
| 150 | if (!ent) |
| 151 | return -ENOMEM; |
| 152 | ent->addr = (unsigned long)__va(0); |
| 153 | ent->size = max_low_pfn << PAGE_SHIFT; |
| 154 | ent->type = KCORE_RAM; |
| 155 | list_add(&ent->list, &head); |
| 156 | __kcore_update_ram(&head); |
| 157 | return ret; |
| 158 | } |
| 159 | |
| 160 | #else /* !CONFIG_HIGHMEM */ |
| 161 | |
KAMEZAWA Hiroyuki | 26562c5 | 2009-09-22 16:45:49 -0700 | [diff] [blame] | 162 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 163 | /* calculate vmemmap's address from given system ram pfn and register it */ |
Djalal Harouni | b908243 | 2012-03-23 15:02:52 -0700 | [diff] [blame] | 164 | static int |
| 165 | get_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head) |
KAMEZAWA Hiroyuki | 26562c5 | 2009-09-22 16:45:49 -0700 | [diff] [blame] | 166 | { |
| 167 | unsigned long pfn = __pa(ent->addr) >> PAGE_SHIFT; |
| 168 | unsigned long nr_pages = ent->size >> PAGE_SHIFT; |
| 169 | unsigned long start, end; |
| 170 | struct kcore_list *vmm, *tmp; |
| 171 | |
| 172 | |
| 173 | start = ((unsigned long)pfn_to_page(pfn)) & PAGE_MASK; |
| 174 | end = ((unsigned long)pfn_to_page(pfn + nr_pages)) - 1; |
| 175 | end = ALIGN(end, PAGE_SIZE); |
| 176 | /* overlap check (because we have to align page */ |
| 177 | list_for_each_entry(tmp, head, list) { |
| 178 | if (tmp->type != KCORE_VMEMMAP) |
| 179 | continue; |
| 180 | if (start < tmp->addr + tmp->size) |
| 181 | if (end > tmp->addr) |
| 182 | end = tmp->addr; |
| 183 | } |
| 184 | if (start < end) { |
| 185 | vmm = kmalloc(sizeof(*vmm), GFP_KERNEL); |
| 186 | if (!vmm) |
| 187 | return 0; |
| 188 | vmm->addr = start; |
| 189 | vmm->size = end - start; |
| 190 | vmm->type = KCORE_VMEMMAP; |
| 191 | list_add_tail(&vmm->list, head); |
| 192 | } |
| 193 | return 1; |
| 194 | |
| 195 | } |
| 196 | #else |
Djalal Harouni | b908243 | 2012-03-23 15:02:52 -0700 | [diff] [blame] | 197 | static int |
| 198 | get_sparsemem_vmemmap_info(struct kcore_list *ent, struct list_head *head) |
KAMEZAWA Hiroyuki | 26562c5 | 2009-09-22 16:45:49 -0700 | [diff] [blame] | 199 | { |
| 200 | return 1; |
| 201 | } |
| 202 | |
| 203 | #endif |
| 204 | |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 205 | static int |
| 206 | kclist_add_private(unsigned long pfn, unsigned long nr_pages, void *arg) |
| 207 | { |
| 208 | struct list_head *head = (struct list_head *)arg; |
| 209 | struct kcore_list *ent; |
| 210 | |
| 211 | ent = kmalloc(sizeof(*ent), GFP_KERNEL); |
| 212 | if (!ent) |
| 213 | return -ENOMEM; |
| 214 | ent->addr = (unsigned long)__va((pfn << PAGE_SHIFT)); |
| 215 | ent->size = nr_pages << PAGE_SHIFT; |
| 216 | |
| 217 | /* Sanity check: Can happen in 32bit arch...maybe */ |
| 218 | if (ent->addr < (unsigned long) __va(0)) |
| 219 | goto free_out; |
| 220 | |
| 221 | /* cut not-mapped area. ....from ppc-32 code. */ |
| 222 | if (ULONG_MAX - ent->addr < ent->size) |
| 223 | ent->size = ULONG_MAX - ent->addr; |
| 224 | |
| 225 | /* cut when vmalloc() area is higher than direct-map area */ |
| 226 | if (VMALLOC_START > (unsigned long)__va(0)) { |
| 227 | if (ent->addr > VMALLOC_START) |
| 228 | goto free_out; |
| 229 | if (VMALLOC_START - ent->addr < ent->size) |
| 230 | ent->size = VMALLOC_START - ent->addr; |
| 231 | } |
| 232 | |
| 233 | ent->type = KCORE_RAM; |
| 234 | list_add_tail(&ent->list, head); |
KAMEZAWA Hiroyuki | 26562c5 | 2009-09-22 16:45:49 -0700 | [diff] [blame] | 235 | |
| 236 | if (!get_sparsemem_vmemmap_info(ent, head)) { |
| 237 | list_del(&ent->list); |
| 238 | goto free_out; |
| 239 | } |
| 240 | |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 241 | return 0; |
| 242 | free_out: |
| 243 | kfree(ent); |
| 244 | return 1; |
| 245 | } |
| 246 | |
| 247 | static int kcore_update_ram(void) |
| 248 | { |
| 249 | int nid, ret; |
| 250 | unsigned long end_pfn; |
| 251 | LIST_HEAD(head); |
| 252 | |
| 253 | /* Not inialized....update now */ |
| 254 | /* find out "max pfn" */ |
| 255 | end_pfn = 0; |
Lai Jiangshan | 4ff1b2c | 2012-12-12 13:51:25 -0800 | [diff] [blame] | 256 | for_each_node_state(nid, N_MEMORY) { |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 257 | unsigned long node_end; |
Xishi Qiu | 83285c7 | 2013-11-12 15:07:19 -0800 | [diff] [blame] | 258 | node_end = node_end_pfn(nid); |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 259 | if (end_pfn < node_end) |
| 260 | end_pfn = node_end; |
| 261 | } |
| 262 | /* scan 0 to max_pfn */ |
| 263 | ret = walk_system_ram_range(0, end_pfn, &head, kclist_add_private); |
| 264 | if (ret) { |
| 265 | free_kclist_ents(&head); |
| 266 | return -ENOMEM; |
| 267 | } |
| 268 | __kcore_update_ram(&head); |
| 269 | return ret; |
| 270 | } |
| 271 | #endif /* CONFIG_HIGHMEM */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | /*****************************************************************************/ |
| 274 | /* |
| 275 | * determine size of ELF note |
| 276 | */ |
| 277 | static int notesize(struct memelfnote *en) |
| 278 | { |
| 279 | int sz; |
| 280 | |
| 281 | sz = sizeof(struct elf_note); |
Vivek Goyal | 632dd20 | 2006-09-29 02:01:45 -0700 | [diff] [blame] | 282 | sz += roundup((strlen(en->name) + 1), 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | sz += roundup(en->datasz, 4); |
| 284 | |
| 285 | return sz; |
| 286 | } /* end notesize() */ |
| 287 | |
| 288 | /*****************************************************************************/ |
| 289 | /* |
| 290 | * store a note in the header buffer |
| 291 | */ |
| 292 | static char *storenote(struct memelfnote *men, char *bufp) |
| 293 | { |
| 294 | struct elf_note en; |
| 295 | |
| 296 | #define DUMP_WRITE(addr,nr) do { memcpy(bufp,addr,nr); bufp += nr; } while(0) |
| 297 | |
Vivek Goyal | 632dd20 | 2006-09-29 02:01:45 -0700 | [diff] [blame] | 298 | en.n_namesz = strlen(men->name) + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | en.n_descsz = men->datasz; |
| 300 | en.n_type = men->type; |
| 301 | |
| 302 | DUMP_WRITE(&en, sizeof(en)); |
| 303 | DUMP_WRITE(men->name, en.n_namesz); |
| 304 | |
| 305 | /* XXX - cast from long long to long to avoid need for libgcc.a */ |
| 306 | bufp = (char*) roundup((unsigned long)bufp,4); |
| 307 | DUMP_WRITE(men->data, men->datasz); |
| 308 | bufp = (char*) roundup((unsigned long)bufp,4); |
| 309 | |
| 310 | #undef DUMP_WRITE |
| 311 | |
| 312 | return bufp; |
| 313 | } /* end storenote() */ |
| 314 | |
| 315 | /* |
| 316 | * store an ELF coredump header in the supplied buffer |
| 317 | * nphdr is the number of elf_phdr to insert |
| 318 | */ |
| 319 | static void elf_kcore_store_hdr(char *bufp, int nphdr, int dataoff) |
| 320 | { |
| 321 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ |
| 322 | struct elf_prpsinfo prpsinfo; /* NT_PRPSINFO */ |
| 323 | struct elf_phdr *nhdr, *phdr; |
| 324 | struct elfhdr *elf; |
| 325 | struct memelfnote notes[3]; |
| 326 | off_t offset = 0; |
| 327 | struct kcore_list *m; |
| 328 | |
| 329 | /* setup ELF header */ |
| 330 | elf = (struct elfhdr *) bufp; |
| 331 | bufp += sizeof(struct elfhdr); |
| 332 | offset += sizeof(struct elfhdr); |
| 333 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
| 334 | elf->e_ident[EI_CLASS] = ELF_CLASS; |
| 335 | elf->e_ident[EI_DATA] = ELF_DATA; |
| 336 | elf->e_ident[EI_VERSION]= EV_CURRENT; |
| 337 | elf->e_ident[EI_OSABI] = ELF_OSABI; |
| 338 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); |
| 339 | elf->e_type = ET_CORE; |
| 340 | elf->e_machine = ELF_ARCH; |
| 341 | elf->e_version = EV_CURRENT; |
| 342 | elf->e_entry = 0; |
| 343 | elf->e_phoff = sizeof(struct elfhdr); |
| 344 | elf->e_shoff = 0; |
Edgar E. Iglesias | 79885b2 | 2008-07-25 01:48:10 -0700 | [diff] [blame] | 345 | elf->e_flags = ELF_CORE_EFLAGS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | elf->e_ehsize = sizeof(struct elfhdr); |
| 347 | elf->e_phentsize= sizeof(struct elf_phdr); |
| 348 | elf->e_phnum = nphdr; |
| 349 | elf->e_shentsize= 0; |
| 350 | elf->e_shnum = 0; |
| 351 | elf->e_shstrndx = 0; |
| 352 | |
| 353 | /* setup ELF PT_NOTE program header */ |
| 354 | nhdr = (struct elf_phdr *) bufp; |
| 355 | bufp += sizeof(struct elf_phdr); |
| 356 | offset += sizeof(struct elf_phdr); |
| 357 | nhdr->p_type = PT_NOTE; |
| 358 | nhdr->p_offset = 0; |
| 359 | nhdr->p_vaddr = 0; |
| 360 | nhdr->p_paddr = 0; |
| 361 | nhdr->p_filesz = 0; |
| 362 | nhdr->p_memsz = 0; |
| 363 | nhdr->p_flags = 0; |
| 364 | nhdr->p_align = 0; |
| 365 | |
| 366 | /* setup ELF PT_LOAD program header for every area */ |
KAMEZAWA Hiroyuki | 2ef43ec | 2009-09-22 16:45:41 -0700 | [diff] [blame] | 367 | list_for_each_entry(m, &kclist_head, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | phdr = (struct elf_phdr *) bufp; |
| 369 | bufp += sizeof(struct elf_phdr); |
| 370 | offset += sizeof(struct elf_phdr); |
| 371 | |
| 372 | phdr->p_type = PT_LOAD; |
| 373 | phdr->p_flags = PF_R|PF_W|PF_X; |
| 374 | phdr->p_offset = kc_vaddr_to_offset(m->addr) + dataoff; |
| 375 | phdr->p_vaddr = (size_t)m->addr; |
| 376 | phdr->p_paddr = 0; |
| 377 | phdr->p_filesz = phdr->p_memsz = m->size; |
| 378 | phdr->p_align = PAGE_SIZE; |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * Set up the notes in similar form to SVR4 core dumps made |
| 383 | * with info from their /proc. |
| 384 | */ |
| 385 | nhdr->p_offset = offset; |
| 386 | |
| 387 | /* set up the process status */ |
Magnus Damm | 3602760 | 2006-12-06 20:38:00 -0800 | [diff] [blame] | 388 | notes[0].name = CORE_STR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | notes[0].type = NT_PRSTATUS; |
| 390 | notes[0].datasz = sizeof(struct elf_prstatus); |
| 391 | notes[0].data = &prstatus; |
| 392 | |
| 393 | memset(&prstatus, 0, sizeof(struct elf_prstatus)); |
| 394 | |
| 395 | nhdr->p_filesz = notesize(¬es[0]); |
| 396 | bufp = storenote(¬es[0], bufp); |
| 397 | |
| 398 | /* set up the process info */ |
Magnus Damm | 3602760 | 2006-12-06 20:38:00 -0800 | [diff] [blame] | 399 | notes[1].name = CORE_STR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | notes[1].type = NT_PRPSINFO; |
| 401 | notes[1].datasz = sizeof(struct elf_prpsinfo); |
| 402 | notes[1].data = &prpsinfo; |
| 403 | |
| 404 | memset(&prpsinfo, 0, sizeof(struct elf_prpsinfo)); |
| 405 | prpsinfo.pr_state = 0; |
| 406 | prpsinfo.pr_sname = 'R'; |
| 407 | prpsinfo.pr_zomb = 0; |
| 408 | |
| 409 | strcpy(prpsinfo.pr_fname, "vmlinux"); |
Zhao Hongjiang | 30bc30d | 2013-07-03 15:08:28 -0700 | [diff] [blame] | 410 | strlcpy(prpsinfo.pr_psargs, saved_command_line, sizeof(prpsinfo.pr_psargs)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
| 412 | nhdr->p_filesz += notesize(¬es[1]); |
| 413 | bufp = storenote(¬es[1], bufp); |
| 414 | |
| 415 | /* set up the task structure */ |
Magnus Damm | 3602760 | 2006-12-06 20:38:00 -0800 | [diff] [blame] | 416 | notes[2].name = CORE_STR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | notes[2].type = NT_TASKSTRUCT; |
| 418 | notes[2].datasz = sizeof(struct task_struct); |
| 419 | notes[2].data = current; |
| 420 | |
| 421 | nhdr->p_filesz += notesize(¬es[2]); |
| 422 | bufp = storenote(¬es[2], bufp); |
| 423 | |
| 424 | } /* end elf_kcore_store_hdr() */ |
| 425 | |
| 426 | /*****************************************************************************/ |
| 427 | /* |
| 428 | * read from the ELF header and then kernel memory |
| 429 | */ |
| 430 | static ssize_t |
| 431 | read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos) |
| 432 | { |
| 433 | ssize_t acc = 0; |
| 434 | size_t size, tsz; |
| 435 | size_t elf_buflen; |
| 436 | int nphdr; |
| 437 | unsigned long start; |
| 438 | |
| 439 | read_lock(&kclist_lock); |
KAMEZAWA Hiroyuki | 678ad5d | 2009-09-22 16:45:51 -0700 | [diff] [blame] | 440 | size = get_kcore_size(&nphdr, &elf_buflen); |
| 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | if (buflen == 0 || *fpos >= size) { |
| 443 | read_unlock(&kclist_lock); |
| 444 | return 0; |
| 445 | } |
| 446 | |
| 447 | /* trim buflen to not go beyond EOF */ |
| 448 | if (buflen > size - *fpos) |
| 449 | buflen = size - *fpos; |
| 450 | |
| 451 | /* construct an ELF core header if we'll need some of it */ |
| 452 | if (*fpos < elf_buflen) { |
| 453 | char * elf_buf; |
| 454 | |
| 455 | tsz = elf_buflen - *fpos; |
| 456 | if (buflen < tsz) |
| 457 | tsz = buflen; |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 458 | elf_buf = kzalloc(elf_buflen, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | if (!elf_buf) { |
| 460 | read_unlock(&kclist_lock); |
| 461 | return -ENOMEM; |
| 462 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | elf_kcore_store_hdr(elf_buf, nphdr, elf_buflen); |
| 464 | read_unlock(&kclist_lock); |
| 465 | if (copy_to_user(buffer, elf_buf + *fpos, tsz)) { |
| 466 | kfree(elf_buf); |
| 467 | return -EFAULT; |
| 468 | } |
| 469 | kfree(elf_buf); |
| 470 | buflen -= tsz; |
| 471 | *fpos += tsz; |
| 472 | buffer += tsz; |
| 473 | acc += tsz; |
| 474 | |
| 475 | /* leave now if filled buffer already */ |
| 476 | if (buflen == 0) |
| 477 | return acc; |
| 478 | } else |
| 479 | read_unlock(&kclist_lock); |
| 480 | |
| 481 | /* |
| 482 | * Check to see if our file offset matches with any of |
| 483 | * the addresses in the elf_phdr on our list. |
| 484 | */ |
| 485 | start = kc_offset_to_vaddr(*fpos - elf_buflen); |
| 486 | if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen) |
| 487 | tsz = buflen; |
| 488 | |
| 489 | while (buflen) { |
| 490 | struct kcore_list *m; |
| 491 | |
| 492 | read_lock(&kclist_lock); |
KAMEZAWA Hiroyuki | 2ef43ec | 2009-09-22 16:45:41 -0700 | [diff] [blame] | 493 | list_for_each_entry(m, &kclist_head, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | if (start >= m->addr && start < (m->addr+m->size)) |
| 495 | break; |
| 496 | } |
| 497 | read_unlock(&kclist_lock); |
| 498 | |
Dan Carpenter | 4fd2c20 | 2010-03-23 13:35:42 -0700 | [diff] [blame] | 499 | if (&m->list == &kclist_head) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | if (clear_user(buffer, tsz)) |
| 501 | return -EFAULT; |
KAMEZAWA Hiroyuki | 81ac3ad | 2009-09-22 16:45:49 -0700 | [diff] [blame] | 502 | } else if (is_vmalloc_or_module_addr((void *)start)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | char * elf_buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 505 | elf_buf = kzalloc(tsz, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | if (!elf_buf) |
| 507 | return -ENOMEM; |
KAMEZAWA Hiroyuki | 73d7c33 | 2009-09-21 17:02:35 -0700 | [diff] [blame] | 508 | vread(elf_buf, (char *)start, tsz); |
| 509 | /* we have to zero-fill user buffer even if no read */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | if (copy_to_user(buffer, elf_buf, tsz)) { |
| 511 | kfree(elf_buf); |
| 512 | return -EFAULT; |
| 513 | } |
| 514 | kfree(elf_buf); |
| 515 | } else { |
| 516 | if (kern_addr_valid(start)) { |
| 517 | unsigned long n; |
| 518 | |
| 519 | n = copy_to_user(buffer, (char *)start, tsz); |
| 520 | /* |
Laura Vasilescu | f1f996b | 2012-03-19 15:41:15 +0200 | [diff] [blame] | 521 | * We cannot distinguish between fault on source |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | * and fault on destination. When this happens |
| 523 | * we clear too and hope it will trigger the |
| 524 | * EFAULT again. |
| 525 | */ |
| 526 | if (n) { |
| 527 | if (clear_user(buffer + tsz - n, |
Adam B. Jerome | 0635170 | 2006-07-12 09:03:07 -0700 | [diff] [blame] | 528 | n)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | return -EFAULT; |
| 530 | } |
| 531 | } else { |
| 532 | if (clear_user(buffer, tsz)) |
| 533 | return -EFAULT; |
| 534 | } |
| 535 | } |
| 536 | buflen -= tsz; |
| 537 | *fpos += tsz; |
| 538 | buffer += tsz; |
| 539 | acc += tsz; |
| 540 | start += tsz; |
| 541 | tsz = (buflen > PAGE_SIZE ? PAGE_SIZE : buflen); |
| 542 | } |
| 543 | |
| 544 | return acc; |
| 545 | } |
Alexey Dobriyan | 97ce5d6 | 2008-10-06 14:14:19 +0400 | [diff] [blame] | 546 | |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 547 | |
| 548 | static int open_kcore(struct inode *inode, struct file *filp) |
| 549 | { |
| 550 | if (!capable(CAP_SYS_RAWIO)) |
| 551 | return -EPERM; |
| 552 | if (kcore_need_update) |
| 553 | kcore_update_ram(); |
KAMEZAWA Hiroyuki | 0d4c36a | 2009-09-22 16:45:52 -0700 | [diff] [blame] | 554 | if (i_size_read(inode) != proc_root_kcore->size) { |
| 555 | mutex_lock(&inode->i_mutex); |
| 556 | i_size_write(inode, proc_root_kcore->size); |
| 557 | mutex_unlock(&inode->i_mutex); |
| 558 | } |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 559 | return 0; |
| 560 | } |
| 561 | |
| 562 | |
| 563 | static const struct file_operations proc_kcore_operations = { |
| 564 | .read = read_kcore, |
| 565 | .open = open_kcore, |
Dave Anderson | ceff1a7 | 2011-01-12 17:00:36 -0800 | [diff] [blame] | 566 | .llseek = default_llseek, |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 567 | }; |
| 568 | |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 569 | /* just remember that we have to update kcore */ |
| 570 | static int __meminit kcore_callback(struct notifier_block *self, |
| 571 | unsigned long action, void *arg) |
| 572 | { |
| 573 | switch (action) { |
| 574 | case MEM_ONLINE: |
| 575 | case MEM_OFFLINE: |
| 576 | write_lock(&kclist_lock); |
| 577 | kcore_need_update = 1; |
| 578 | write_unlock(&kclist_lock); |
| 579 | } |
| 580 | return NOTIFY_OK; |
| 581 | } |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 582 | |
Andrew Morton | 3c743a7 | 2013-04-29 15:08:08 -0700 | [diff] [blame] | 583 | static struct notifier_block kcore_callback_nb __meminitdata = { |
| 584 | .notifier_call = kcore_callback, |
| 585 | .priority = 0, |
| 586 | }; |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 587 | |
KAMEZAWA Hiroyuki | a0614da | 2009-09-22 16:45:44 -0700 | [diff] [blame] | 588 | static struct kcore_list kcore_vmalloc; |
| 589 | |
KAMEZAWA Hiroyuki | 9492587 | 2009-09-22 16:45:45 -0700 | [diff] [blame] | 590 | #ifdef CONFIG_ARCH_PROC_KCORE_TEXT |
| 591 | static struct kcore_list kcore_text; |
| 592 | /* |
| 593 | * If defined, special segment is used for mapping kernel text instead of |
| 594 | * direct-map area. We need to create special TEXT section. |
| 595 | */ |
| 596 | static void __init proc_kcore_text_init(void) |
| 597 | { |
Wu Fengguang | 36e1526 | 2010-05-26 14:43:27 -0700 | [diff] [blame] | 598 | kclist_add(&kcore_text, _text, _end - _text, KCORE_TEXT); |
KAMEZAWA Hiroyuki | 9492587 | 2009-09-22 16:45:45 -0700 | [diff] [blame] | 599 | } |
| 600 | #else |
| 601 | static void __init proc_kcore_text_init(void) |
| 602 | { |
| 603 | } |
| 604 | #endif |
| 605 | |
KAMEZAWA Hiroyuki | 81ac3ad | 2009-09-22 16:45:49 -0700 | [diff] [blame] | 606 | #if defined(CONFIG_MODULES) && defined(MODULES_VADDR) |
| 607 | /* |
| 608 | * MODULES_VADDR has no intersection with VMALLOC_ADDR. |
| 609 | */ |
| 610 | struct kcore_list kcore_modules; |
| 611 | static void __init add_modules_range(void) |
| 612 | { |
| 613 | kclist_add(&kcore_modules, (void *)MODULES_VADDR, |
| 614 | MODULES_END - MODULES_VADDR, KCORE_VMALLOC); |
| 615 | } |
| 616 | #else |
| 617 | static void __init add_modules_range(void) |
| 618 | { |
| 619 | } |
| 620 | #endif |
| 621 | |
Alexey Dobriyan | 97ce5d6 | 2008-10-06 14:14:19 +0400 | [diff] [blame] | 622 | static int __init proc_kcore_init(void) |
| 623 | { |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 624 | proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, |
| 625 | &proc_kcore_operations); |
KAMEZAWA Hiroyuki | 90396f9 | 2009-09-22 16:45:50 -0700 | [diff] [blame] | 626 | if (!proc_root_kcore) { |
Andrew Morton | 87ebdc0 | 2013-02-27 17:03:16 -0800 | [diff] [blame] | 627 | pr_err("couldn't create /proc/kcore\n"); |
KAMEZAWA Hiroyuki | 90396f9 | 2009-09-22 16:45:50 -0700 | [diff] [blame] | 628 | return 0; /* Always returns 0. */ |
| 629 | } |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 630 | /* Store text area if it's special */ |
KAMEZAWA Hiroyuki | 9492587 | 2009-09-22 16:45:45 -0700 | [diff] [blame] | 631 | proc_kcore_text_init(); |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 632 | /* Store vmalloc area */ |
KAMEZAWA Hiroyuki | a0614da | 2009-09-22 16:45:44 -0700 | [diff] [blame] | 633 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, |
| 634 | VMALLOC_END - VMALLOC_START, KCORE_VMALLOC); |
KAMEZAWA Hiroyuki | 81ac3ad | 2009-09-22 16:45:49 -0700 | [diff] [blame] | 635 | add_modules_range(); |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 636 | /* Store direct-map area from physical memory map */ |
| 637 | kcore_update_ram(); |
Andrew Morton | 3c743a7 | 2013-04-29 15:08:08 -0700 | [diff] [blame] | 638 | register_hotmemory_notifier(&kcore_callback_nb); |
KAMEZAWA Hiroyuki | 3089aa1 | 2009-09-22 16:45:48 -0700 | [diff] [blame] | 639 | |
Alexey Dobriyan | 97ce5d6 | 2008-10-06 14:14:19 +0400 | [diff] [blame] | 640 | return 0; |
| 641 | } |
| 642 | module_init(proc_kcore_init); |