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authorDavid Howells <dhowells@redhat.com>2006-07-10 07:44:55 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-10 16:24:22 -0400
commit6d8c4e3b0150ff537902477ed62f8a8e9e70007b (patch)
tree0fe61afc565c4312f8a4395281186c0e54449c1c /fs
parentb4cac1a0227a6f84be0381cd350a3c8730a4a671 (diff)
[PATCH] FDPIC: Add coredump capability for the ELF-FDPIC binfmt
Add coredump capability for the ELF-FDPIC binfmt. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/binfmt_elf_fdpic.c676
1 files changed, 674 insertions, 2 deletions
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index a4ff87389823..2f3365829229 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -24,7 +24,9 @@
24#include <linux/file.h> 24#include <linux/file.h>
25#include <linux/fcntl.h> 25#include <linux/fcntl.h>
26#include <linux/slab.h> 26#include <linux/slab.h>
27#include <linux/pagemap.h>
27#include <linux/highmem.h> 28#include <linux/highmem.h>
29#include <linux/highuid.h>
28#include <linux/personality.h> 30#include <linux/personality.h>
29#include <linux/ptrace.h> 31#include <linux/ptrace.h>
30#include <linux/init.h> 32#include <linux/init.h>
@@ -48,6 +50,12 @@ typedef char *elf_caddr_t;
48#define kdebug(fmt, ...) do {} while(0) 50#define kdebug(fmt, ...) do {} while(0)
49#endif 51#endif
50 52
53#if 0
54#define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
55#else
56#define kdcore(fmt, ...) do {} while(0)
57#endif
58
51MODULE_LICENSE("GPL"); 59MODULE_LICENSE("GPL");
52 60
53static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *); 61static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *);
@@ -70,10 +78,16 @@ static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
70static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, 78static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
71 struct file *, struct mm_struct *); 79 struct file *, struct mm_struct *);
72 80
81#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
82static int elf_fdpic_core_dump(long, struct pt_regs *, struct file *);
83#endif
84
73static struct linux_binfmt elf_fdpic_format = { 85static struct linux_binfmt elf_fdpic_format = {
74 .module = THIS_MODULE, 86 .module = THIS_MODULE,
75 .load_binary = load_elf_fdpic_binary, 87 .load_binary = load_elf_fdpic_binary,
76// .core_dump = elf_fdpic_core_dump, 88#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
89 .core_dump = elf_fdpic_core_dump,
90#endif
77 .min_coredump = ELF_EXEC_PAGESIZE, 91 .min_coredump = ELF_EXEC_PAGESIZE,
78}; 92};
79 93
@@ -87,7 +101,7 @@ static void __exit exit_elf_fdpic_binfmt(void)
87 unregister_binfmt(&elf_fdpic_format); 101 unregister_binfmt(&elf_fdpic_format);
88} 102}
89 103
90module_init(init_elf_fdpic_binfmt); 104core_initcall(init_elf_fdpic_binfmt);
91module_exit(exit_elf_fdpic_binfmt); 105module_exit(exit_elf_fdpic_binfmt);
92 106
93static int is_elf_fdpic(struct elfhdr *hdr, struct file *file) 107static int is_elf_fdpic(struct elfhdr *hdr, struct file *file)
@@ -1118,3 +1132,661 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1118 1132
1119 return 0; 1133 return 0;
1120} 1134}
1135
1136/*****************************************************************************/
1137/*
1138 * ELF-FDPIC core dumper
1139 *
1140 * Modelled on fs/exec.c:aout_core_dump()
1141 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1142 *
1143 * Modelled on fs/binfmt_elf.c core dumper
1144 */
1145#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
1146
1147/*
1148 * These are the only things you should do on a core-file: use only these
1149 * functions to write out all the necessary info.
1150 */
1151static int dump_write(struct file *file, const void *addr, int nr)
1152{
1153 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
1154}
1155
1156static int dump_seek(struct file *file, loff_t off)
1157{
1158 if (file->f_op->llseek) {
1159 if (file->f_op->llseek(file, off, SEEK_SET) != off)
1160 return 0;
1161 } else {
1162 file->f_pos = off;
1163 }
1164 return 1;
1165}
1166
1167/*
1168 * Decide whether a segment is worth dumping; default is yes to be
1169 * sure (missing info is worse than too much; etc).
1170 * Personally I'd include everything, and use the coredump limit...
1171 *
1172 * I think we should skip something. But I am not sure how. H.J.
1173 */
1174static int maydump(struct vm_area_struct *vma)
1175{
1176 /* Do not dump I/O mapped devices or special mappings */
1177 if (vma->vm_flags & (VM_IO | VM_RESERVED)) {
1178 kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags);
1179 return 0;
1180 }
1181
1182 /* If we may not read the contents, don't allow us to dump
1183 * them either. "dump_write()" can't handle it anyway.
1184 */
1185 if (!(vma->vm_flags & VM_READ)) {
1186 kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags);
1187 return 0;
1188 }
1189
1190 /* Dump shared memory only if mapped from an anonymous file. */
1191 if (vma->vm_flags & VM_SHARED) {
1192 if (vma->vm_file->f_dentry->d_inode->i_nlink == 0) {
1193 kdcore("%08lx: %08lx: no (share)", vma->vm_start, vma->vm_flags);
1194 return 1;
1195 }
1196
1197 kdcore("%08lx: %08lx: no (share)", vma->vm_start, vma->vm_flags);
1198 return 0;
1199 }
1200
1201#ifdef CONFIG_MMU
1202 /* If it hasn't been written to, don't write it out */
1203 if (!vma->anon_vma) {
1204 kdcore("%08lx: %08lx: no (!anon)", vma->vm_start, vma->vm_flags);
1205 return 0;
1206 }
1207#endif
1208
1209 kdcore("%08lx: %08lx: yes", vma->vm_start, vma->vm_flags);
1210 return 1;
1211}
1212
1213/* An ELF note in memory */
1214struct memelfnote
1215{
1216 const char *name;
1217 int type;
1218 unsigned int datasz;
1219 void *data;
1220};
1221
1222static int notesize(struct memelfnote *en)
1223{
1224 int sz;
1225
1226 sz = sizeof(struct elf_note);
1227 sz += roundup(strlen(en->name) + 1, 4);
1228 sz += roundup(en->datasz, 4);
1229
1230 return sz;
1231}
1232
1233/* #define DEBUG */
1234
1235#define DUMP_WRITE(addr, nr) \
1236 do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
1237#define DUMP_SEEK(off) \
1238 do { if (!dump_seek(file, (off))) return 0; } while(0)
1239
1240static int writenote(struct memelfnote *men, struct file *file)
1241{
1242 struct elf_note en;
1243
1244 en.n_namesz = strlen(men->name) + 1;
1245 en.n_descsz = men->datasz;
1246 en.n_type = men->type;
1247
1248 DUMP_WRITE(&en, sizeof(en));
1249 DUMP_WRITE(men->name, en.n_namesz);
1250 /* XXX - cast from long long to long to avoid need for libgcc.a */
1251 DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
1252 DUMP_WRITE(men->data, men->datasz);
1253 DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
1254
1255 return 1;
1256}
1257#undef DUMP_WRITE
1258#undef DUMP_SEEK
1259
1260#define DUMP_WRITE(addr, nr) \
1261 if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
1262 goto end_coredump;
1263#define DUMP_SEEK(off) \
1264 if (!dump_seek(file, (off))) \
1265 goto end_coredump;
1266
1267static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
1268{
1269 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1270 elf->e_ident[EI_CLASS] = ELF_CLASS;
1271 elf->e_ident[EI_DATA] = ELF_DATA;
1272 elf->e_ident[EI_VERSION] = EV_CURRENT;
1273 elf->e_ident[EI_OSABI] = ELF_OSABI;
1274 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1275
1276 elf->e_type = ET_CORE;
1277 elf->e_machine = ELF_ARCH;
1278 elf->e_version = EV_CURRENT;
1279 elf->e_entry = 0;
1280 elf->e_phoff = sizeof(struct elfhdr);
1281 elf->e_shoff = 0;
1282 elf->e_flags = ELF_FDPIC_CORE_EFLAGS;
1283 elf->e_ehsize = sizeof(struct elfhdr);
1284 elf->e_phentsize = sizeof(struct elf_phdr);
1285 elf->e_phnum = segs;
1286 elf->e_shentsize = 0;
1287 elf->e_shnum = 0;
1288 elf->e_shstrndx = 0;
1289 return;
1290}
1291
1292static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1293{
1294 phdr->p_type = PT_NOTE;
1295 phdr->p_offset = offset;
1296 phdr->p_vaddr = 0;
1297 phdr->p_paddr = 0;
1298 phdr->p_filesz = sz;
1299 phdr->p_memsz = 0;
1300 phdr->p_flags = 0;
1301 phdr->p_align = 0;
1302 return;
1303}
1304
1305static inline void fill_note(struct memelfnote *note, const char *name, int type,
1306 unsigned int sz, void *data)
1307{
1308 note->name = name;
1309 note->type = type;
1310 note->datasz = sz;
1311 note->data = data;
1312 return;
1313}
1314
1315/*
1316 * fill up all the fields in prstatus from the given task struct, except
1317 * registers which need to be filled up seperately.
1318 */
1319static void fill_prstatus(struct elf_prstatus *prstatus,
1320 struct task_struct *p, long signr)
1321{
1322 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1323 prstatus->pr_sigpend = p->pending.signal.sig[0];
1324 prstatus->pr_sighold = p->blocked.sig[0];
1325 prstatus->pr_pid = p->pid;
1326 prstatus->pr_ppid = p->parent->pid;
1327 prstatus->pr_pgrp = process_group(p);
1328 prstatus->pr_sid = p->signal->session;
1329 if (thread_group_leader(p)) {
1330 /*
1331 * This is the record for the group leader. Add in the
1332 * cumulative times of previous dead threads. This total
1333 * won't include the time of each live thread whose state
1334 * is included in the core dump. The final total reported
1335 * to our parent process when it calls wait4 will include
1336 * those sums as well as the little bit more time it takes
1337 * this and each other thread to finish dying after the
1338 * core dump synchronization phase.
1339 */
1340 cputime_to_timeval(cputime_add(p->utime, p->signal->utime),
1341 &prstatus->pr_utime);
1342 cputime_to_timeval(cputime_add(p->stime, p->signal->stime),
1343 &prstatus->pr_stime);
1344 } else {
1345 cputime_to_timeval(p->utime, &prstatus->pr_utime);
1346 cputime_to_timeval(p->stime, &prstatus->pr_stime);
1347 }
1348 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1349 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1350
1351 prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
1352 prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
1353}
1354
1355static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1356 struct mm_struct *mm)
1357{
1358 unsigned int i, len;
1359
1360 /* first copy the parameters from user space */
1361 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1362
1363 len = mm->arg_end - mm->arg_start;
1364 if (len >= ELF_PRARGSZ)
1365 len = ELF_PRARGSZ - 1;
1366 if (copy_from_user(&psinfo->pr_psargs,
1367 (const char __user *) mm->arg_start, len))
1368 return -EFAULT;
1369 for (i = 0; i < len; i++)
1370 if (psinfo->pr_psargs[i] == 0)
1371 psinfo->pr_psargs[i] = ' ';
1372 psinfo->pr_psargs[len] = 0;
1373
1374 psinfo->pr_pid = p->pid;
1375 psinfo->pr_ppid = p->parent->pid;
1376 psinfo->pr_pgrp = process_group(p);
1377 psinfo->pr_sid = p->signal->session;
1378
1379 i = p->state ? ffz(~p->state) + 1 : 0;
1380 psinfo->pr_state = i;
1381 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1382 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1383 psinfo->pr_nice = task_nice(p);
1384 psinfo->pr_flag = p->flags;
1385 SET_UID(psinfo->pr_uid, p->uid);
1386 SET_GID(psinfo->pr_gid, p->gid);
1387 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1388
1389 return 0;
1390}
1391
1392/* Here is the structure in which status of each thread is captured. */
1393struct elf_thread_status
1394{
1395 struct list_head list;
1396 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1397 elf_fpregset_t fpu; /* NT_PRFPREG */
1398 struct task_struct *thread;
1399#ifdef ELF_CORE_COPY_XFPREGS
1400 elf_fpxregset_t xfpu; /* NT_PRXFPREG */
1401#endif
1402 struct memelfnote notes[3];
1403 int num_notes;
1404};
1405
1406/*
1407 * In order to add the specific thread information for the elf file format,
1408 * we need to keep a linked list of every thread's pr_status and then create
1409 * a single section for them in the final core file.
1410 */
1411static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1412{
1413 struct task_struct *p = t->thread;
1414 int sz = 0;
1415
1416 t->num_notes = 0;
1417
1418 fill_prstatus(&t->prstatus, p, signr);
1419 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1420
1421 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1422 &t->prstatus);
1423 t->num_notes++;
1424 sz += notesize(&t->notes[0]);
1425
1426 t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
1427 if (t->prstatus.pr_fpvalid) {
1428 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1429 &t->fpu);
1430 t->num_notes++;
1431 sz += notesize(&t->notes[1]);
1432 }
1433
1434#ifdef ELF_CORE_COPY_XFPREGS
1435 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1436 fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu),
1437 &t->xfpu);
1438 t->num_notes++;
1439 sz += notesize(&t->notes[2]);
1440 }
1441#endif
1442 return sz;
1443}
1444
1445/*
1446 * dump the segments for an MMU process
1447 */
1448#ifdef CONFIG_MMU
1449static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm,
1450 size_t *size, unsigned long *limit)
1451{
1452 struct vm_area_struct *vma;
1453
1454 for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1455 unsigned long addr;
1456
1457 if (!maydump(vma))
1458 continue;
1459
1460 for (addr = vma->vm_start;
1461 addr < vma->vm_end;
1462 addr += PAGE_SIZE
1463 ) {
1464 struct vm_area_struct *vma;
1465 struct page *page;
1466
1467 if (get_user_pages(current, current->mm, addr, 1, 0, 1,
1468 &page, &vma) <= 0) {
1469 DUMP_SEEK(file->f_pos + PAGE_SIZE);
1470 }
1471 else if (page == ZERO_PAGE(addr)) {
1472 DUMP_SEEK(file->f_pos + PAGE_SIZE);
1473 page_cache_release(page);
1474 }
1475 else {
1476 void *kaddr;
1477
1478 flush_cache_page(vma, addr, page_to_pfn(page));
1479 kaddr = kmap(page);
1480 if ((*size += PAGE_SIZE) > *limit ||
1481 !dump_write(file, kaddr, PAGE_SIZE)
1482 ) {
1483 kunmap(page);
1484 page_cache_release(page);
1485 return -EIO;
1486 }
1487 kunmap(page);
1488 page_cache_release(page);
1489 }
1490 }
1491 }
1492
1493 return 0;
1494
1495end_coredump:
1496 return -EFBIG;
1497}
1498#endif
1499
1500/*
1501 * dump the segments for a NOMMU process
1502 */
1503#ifndef CONFIG_MMU
1504static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm,
1505 size_t *size, unsigned long *limit)
1506{
1507 struct vm_list_struct *vml;
1508
1509 for (vml = current->mm->context.vmlist; vml; vml = vml->next) {
1510 struct vm_area_struct *vma = vml->vma;
1511
1512 if (!maydump(vma))
1513 continue;
1514
1515 if ((*size += PAGE_SIZE) > *limit)
1516 return -EFBIG;
1517
1518 if (!dump_write(file, (void *) vma->vm_start,
1519 vma->vm_end - vma->vm_start))
1520 return -EIO;
1521 }
1522
1523 return 0;
1524}
1525#endif
1526
1527/*
1528 * Actual dumper
1529 *
1530 * This is a two-pass process; first we find the offsets of the bits,
1531 * and then they are actually written out. If we run out of core limit
1532 * we just truncate.
1533 */
1534static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
1535 struct file *file)
1536{
1537#define NUM_NOTES 6
1538 int has_dumped = 0;
1539 mm_segment_t fs;
1540 int segs;
1541 size_t size = 0;
1542 int i;
1543 struct vm_area_struct *vma;
1544 struct elfhdr *elf = NULL;
1545 loff_t offset = 0, dataoff;
1546 unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
1547 int numnote;
1548 struct memelfnote *notes = NULL;
1549 struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
1550 struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
1551 struct task_struct *g, *p;
1552 LIST_HEAD(thread_list);
1553 struct list_head *t;
1554 elf_fpregset_t *fpu = NULL;
1555#ifdef ELF_CORE_COPY_XFPREGS
1556 elf_fpxregset_t *xfpu = NULL;
1557#endif
1558 int thread_status_size = 0;
1559#ifndef CONFIG_MMU
1560 struct vm_list_struct *vml;
1561#endif
1562 elf_addr_t *auxv;
1563
1564 /*
1565 * We no longer stop all VM operations.
1566 *
1567 * This is because those proceses that could possibly change map_count
1568 * or the mmap / vma pages are now blocked in do_exit on current
1569 * finishing this core dump.
1570 *
1571 * Only ptrace can touch these memory addresses, but it doesn't change
1572 * the map_count or the pages allocated. So no possibility of crashing
1573 * exists while dumping the mm->vm_next areas to the core file.
1574 */
1575
1576 /* alloc memory for large data structures: too large to be on stack */
1577 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1578 if (!elf)
1579 goto cleanup;
1580 prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
1581 if (!prstatus)
1582 goto cleanup;
1583 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1584 if (!psinfo)
1585 goto cleanup;
1586 notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1587 if (!notes)
1588 goto cleanup;
1589 fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1590 if (!fpu)
1591 goto cleanup;
1592#ifdef ELF_CORE_COPY_XFPREGS
1593 xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1594 if (!xfpu)
1595 goto cleanup;
1596#endif
1597
1598 if (signr) {
1599 struct elf_thread_status *tmp;
1600 read_lock(&tasklist_lock);
1601 do_each_thread(g,p)
1602 if (current->mm == p->mm && current != p) {
1603 tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
1604 if (!tmp) {
1605 read_unlock(&tasklist_lock);
1606 goto cleanup;
1607 }
1608 INIT_LIST_HEAD(&tmp->list);
1609 tmp->thread = p;
1610 list_add(&tmp->list, &thread_list);
1611 }
1612 while_each_thread(g,p);
1613 read_unlock(&tasklist_lock);
1614 list_for_each(t, &thread_list) {
1615 struct elf_thread_status *tmp;
1616 int sz;
1617
1618 tmp = list_entry(t, struct elf_thread_status, list);
1619 sz = elf_dump_thread_status(signr, tmp);
1620 thread_status_size += sz;
1621 }
1622 }
1623
1624 /* now collect the dump for the current */
1625 fill_prstatus(prstatus, current, signr);
1626 elf_core_copy_regs(&prstatus->pr_reg, regs);
1627
1628#ifdef CONFIG_MMU
1629 segs = current->mm->map_count;
1630#else
1631 segs = 0;
1632 for (vml = current->mm->context.vmlist; vml; vml = vml->next)
1633 segs++;
1634#endif
1635#ifdef ELF_CORE_EXTRA_PHDRS
1636 segs += ELF_CORE_EXTRA_PHDRS;
1637#endif
1638
1639 /* Set up header */
1640 fill_elf_fdpic_header(elf, segs + 1); /* including notes section */
1641
1642 has_dumped = 1;
1643 current->flags |= PF_DUMPCORE;
1644
1645 /*
1646 * Set up the notes in similar form to SVR4 core dumps made
1647 * with info from their /proc.
1648 */
1649
1650 fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1651 fill_psinfo(psinfo, current->group_leader, current->mm);
1652 fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1653
1654 numnote = 2;
1655
1656 auxv = (elf_addr_t *) current->mm->saved_auxv;
1657
1658 i = 0;
1659 do
1660 i += 2;
1661 while (auxv[i - 2] != AT_NULL);
1662 fill_note(&notes[numnote++], "CORE", NT_AUXV,
1663 i * sizeof(elf_addr_t), auxv);
1664
1665 /* Try to dump the FPU. */
1666 if ((prstatus->pr_fpvalid =
1667 elf_core_copy_task_fpregs(current, regs, fpu)))
1668 fill_note(notes + numnote++,
1669 "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1670#ifdef ELF_CORE_COPY_XFPREGS
1671 if (elf_core_copy_task_xfpregs(current, xfpu))
1672 fill_note(notes + numnote++,
1673 "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu);
1674#endif
1675
1676 fs = get_fs();
1677 set_fs(KERNEL_DS);
1678
1679 DUMP_WRITE(elf, sizeof(*elf));
1680 offset += sizeof(*elf); /* Elf header */
1681 offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */
1682
1683 /* Write notes phdr entry */
1684 {
1685 struct elf_phdr phdr;
1686 int sz = 0;
1687
1688 for (i = 0; i < numnote; i++)
1689 sz += notesize(notes + i);
1690
1691 sz += thread_status_size;
1692
1693 fill_elf_note_phdr(&phdr, sz, offset);
1694 offset += sz;
1695 DUMP_WRITE(&phdr, sizeof(phdr));
1696 }
1697
1698 /* Page-align dumped data */
1699 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1700
1701 /* write program headers for segments dump */
1702 for (
1703#ifdef CONFIG_MMU
1704 vma = current->mm->mmap; vma; vma = vma->vm_next
1705#else
1706 vml = current->mm->context.vmlist; vml; vml = vml->next
1707#endif
1708 ) {
1709 struct elf_phdr phdr;
1710 size_t sz;
1711
1712#ifndef CONFIG_MMU
1713 vma = vml->vma;
1714#endif
1715
1716 sz = vma->vm_end - vma->vm_start;
1717
1718 phdr.p_type = PT_LOAD;
1719 phdr.p_offset = offset;
1720 phdr.p_vaddr = vma->vm_start;
1721 phdr.p_paddr = 0;
1722 phdr.p_filesz = maydump(vma) ? sz : 0;
1723 phdr.p_memsz = sz;
1724 offset += phdr.p_filesz;
1725 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1726 if (vma->vm_flags & VM_WRITE)
1727 phdr.p_flags |= PF_W;
1728 if (vma->vm_flags & VM_EXEC)
1729 phdr.p_flags |= PF_X;
1730 phdr.p_align = ELF_EXEC_PAGESIZE;
1731
1732 DUMP_WRITE(&phdr, sizeof(phdr));
1733 }
1734
1735#ifdef ELF_CORE_WRITE_EXTRA_PHDRS
1736 ELF_CORE_WRITE_EXTRA_PHDRS;
1737#endif
1738
1739 /* write out the notes section */
1740 for (i = 0; i < numnote; i++)
1741 if (!writenote(notes + i, file))
1742 goto end_coredump;
1743
1744 /* write out the thread status notes section */
1745 list_for_each(t, &thread_list) {
1746 struct elf_thread_status *tmp =
1747 list_entry(t, struct elf_thread_status, list);
1748
1749 for (i = 0; i < tmp->num_notes; i++)
1750 if (!writenote(&tmp->notes[i], file))
1751 goto end_coredump;
1752 }
1753
1754 DUMP_SEEK(dataoff);
1755
1756 if (elf_fdpic_dump_segments(file, current->mm, &size, &limit) < 0)
1757 goto end_coredump;
1758
1759#ifdef ELF_CORE_WRITE_EXTRA_DATA
1760 ELF_CORE_WRITE_EXTRA_DATA;
1761#endif
1762
1763 if (file->f_pos != offset) {
1764 /* Sanity check */
1765 printk(KERN_WARNING
1766 "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
1767 file->f_pos, offset);
1768 }
1769
1770end_coredump:
1771 set_fs(fs);
1772
1773cleanup:
1774 while (!list_empty(&thread_list)) {
1775 struct list_head *tmp = thread_list.next;
1776 list_del(tmp);
1777 kfree(list_entry(tmp, struct elf_thread_status, list));
1778 }
1779
1780 kfree(elf);
1781 kfree(prstatus);
1782 kfree(psinfo);
1783 kfree(notes);
1784 kfree(fpu);
1785#ifdef ELF_CORE_COPY_XFPREGS
1786 kfree(xfpu);
1787#endif
1788 return has_dumped;
1789#undef NUM_NOTES
1790}
1791
1792#endif /* USE_ELF_CORE_DUMP */