aboutsummaryrefslogtreecommitdiffstats
path: root/src
diff options
context:
space:
mode:
authorAlex Gaynor <alex.gaynor@gmail.com>2017-07-21 13:16:24 -0400
committerPaul Kehrer <paul.l.kehrer@gmail.com>2017-07-21 20:16:24 +0300
commitd10480b27416508163bdb7d22265f25aae3d5b7d (patch)
tree33c32fbf78c3233d6a342bb31695fd267f21495a /src
parent36a4d473a19953443362bd9c3ca5d706688d64f1 (diff)
downloadcryptography-d10480b27416508163bdb7d22265f25aae3d5b7d.tar.gz
cryptography-d10480b27416508163bdb7d22265f25aae3d5b7d.tar.bz2
cryptography-d10480b27416508163bdb7d22265f25aae3d5b7d.zip
Fixed #3798 -- use the correct stacklevel on this warning (#3803)
Diffstat (limited to 'src')
-rw-r--r--src/cryptography/hazmat/backends/openssl/utils.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cryptography/hazmat/backends/openssl/utils.py b/src/cryptography/hazmat/backends/openssl/utils.py
index ff1b9745..05d0fe58 100644
--- a/src/cryptography/hazmat/backends/openssl/utils.py
+++ b/src/cryptography/hazmat/backends/openssl/utils.py
@@ -41,5 +41,5 @@ def _warn_sign_verify_deprecated():
"signer and verifier have been deprecated. Please use sign "
"and verify instead.",
utils.PersistentlyDeprecated,
- stacklevel=2
+ stacklevel=3
)
generated by cgit v1.2.3 (git 2.25.1) at 2025-12-08 19:04:05 +0000
id='n142' href='#n142'>142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 
/*
 * Xen domain builder -- i386 and x86_64 bits.
 *
 * Most architecture-specific code for x86 goes here.
 *   - prepare page tables.
 *   - fill architecture-specific structs.
 *
 * This code is licenced under the GPL.
 * written 2006 by Gerd Hoffmann <kraxel@suse.de>.
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>

#include <xen/xen.h>
#include <xen/foreign/x86_32.h>
#include <xen/foreign/x86_64.h>
#include <xen/hvm/hvm_info_table.h>
#include <xen/io/protocols.h>

#include "xg_private.h"
#include "xc_dom.h"
#include "xenctrl.h"

/* ------------------------------------------------------------------------ */

#define bits_to_mask(bits)       (((xen_vaddr_t)1 << (bits))-1)
#define round_down(addr, mask)   ((addr) & ~(mask))
#define round_up(addr, mask)     ((addr) | (mask))

static unsigned long
nr_page_tables(xen_vaddr_t start, xen_vaddr_t end, unsigned long bits)
{
    xen_vaddr_t mask = bits_to_mask(bits);
    int tables;

    if ( bits == 0 )
        return 0;  /* unused */

    if ( bits == (8 * sizeof(unsigned long)) )
    {
        /* must be pgd, need one */
        start = 0;
        end = -1;
        tables = 1;
    }
    else
    {
        start = round_down(start, mask);
        end = round_up(end, mask);
        tables = ((end - start) >> bits) + 1;
    }

    xc_dom_printf("%s: 0x%016" PRIx64 "/%ld: 0x%016" PRIx64
                  " -> 0x%016" PRIx64 ", %d table(s)\n",
                  __FUNCTION__, mask, bits, start, end, tables);
    return tables;
}

static int count_pgtables(struct xc_dom_image *dom, int pae,
                          int l4_bits, int l3_bits, int l2_bits, int l1_bits)
{
    int pages, extra_pages;
    xen_vaddr_t try_virt_end;

    extra_pages = dom->alloc_bootstack ? 1 : 0;
    extra_pages += dom->extra_pages;
    extra_pages += 128; /* 512kB padding */
    pages = extra_pages;
    for ( ; ; )
    {
        try_virt_end = round_up(dom->virt_alloc_end + pages * PAGE_SIZE_X86,
                                bits_to_mask(22)); /* 4MB alignment */
        dom->pg_l4 =
            nr_page_tables(dom->parms.virt_base, try_virt_end, l4_bits);
        dom->pg_l3 =
            nr_page_tables(dom->parms.virt_base, try_virt_end, l3_bits);
        dom->pg_l2 =
            nr_page_tables(dom->parms.virt_base, try_virt_end, l2_bits);
        dom->pg_l1 =
            nr_page_tables(dom->parms.virt_base, try_virt_end, l1_bits);
        if (pae && try_virt_end < 0xc0000000)
        {
            xc_dom_printf("%s: PAE: extra l2 page table for l3#3\n",
                          __FUNCTION__);
            dom->pg_l2++;
        }
        dom->pgtables = dom->pg_l4 + dom->pg_l3 + dom->pg_l2 + dom->pg_l1;
        pages = dom->pgtables + extra_pages;
        if ( dom->virt_alloc_end + pages * PAGE_SIZE_X86 <= try_virt_end + 1 )
            break;
    }
    dom->virt_pgtab_end = try_virt_end + 1;
    return 0;
}

/* ------------------------------------------------------------------------ */
/* i386 pagetables                                                          */

#define L1_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED)
#define L2_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY|_PAGE_USER)
#define L3_PROT (_PAGE_PRESENT)

static int count_pgtables_x86_32(struct xc_dom_image *dom)
{
    return count_pgtables(dom, 0, 0, 0, 32, L2_PAGETABLE_SHIFT_I386);
}

static int count_pgtables_x86_32_pae(struct xc_dom_image *dom)
{
    return count_pgtables(dom, 1, 0, 32,
                          L3_PAGETABLE_SHIFT_PAE, L2_PAGETABLE_SHIFT_PAE);
}

#define pfn_to_paddr(pfn) ((xen_paddr_t)(pfn) << PAGE_SHIFT_X86)

static int setup_pgtables_x86_32(struct xc_dom_image *dom)
{
    xen_pfn_t l2pfn = dom->pgtables_seg.pfn;
    xen_pfn_t l1pfn = dom->pgtables_seg.pfn + dom->pg_l2;
    l2_pgentry_32_t *l2tab = xc_dom_pfn_to_ptr(dom, l2pfn, 1);
    l1_pgentry_32_t *l1tab = NULL;
    unsigned long l2off, l1off;
    xen_vaddr_t addr;
    xen_pfn_t pgpfn;

    for ( addr = dom->parms.virt_base; addr < dom->virt_pgtab_end;
          addr += PAGE_SIZE_X86 )
    {
        if ( l1tab == NULL )
        {
            /* get L1 tab, make L2 entry */
            l1tab = xc_dom_pfn_to_ptr(dom, l1pfn, 1);
            l2off = l2_table_offset_i386(addr);
            l2tab[l2off] =
                pfn_to_paddr(xc_dom_p2m_guest(dom, l1pfn)) | L2_PROT;
            l1pfn++;
        }

        /* make L1 entry */
        l1off = l1_table_offset_i386(addr);
        pgpfn = (addr - dom->parms.virt_base) >> PAGE_SHIFT_X86;
        l1tab[l1off] =
            pfn_to_paddr(xc_dom_p2m_guest(dom, pgpfn)) | L1_PROT;
        if ( (addr >= dom->pgtables_seg.vstart) && 
             (addr < dom->pgtables_seg.vend) )
            l1tab[l1off] &= ~_PAGE_RW; /* page tables are r/o */
        if ( l1off == (L1_PAGETABLE_ENTRIES_I386 - 1) )
            l1tab = NULL;
    }
    return 0;
}

/*
 * Move the l3 page table page below 4G for guests which do not
 * support the extended-cr3 format.  The l3 is currently empty so we
 * do not need to preserve the current contents.
 */
static xen_pfn_t move_l3_below_4G(struct xc_dom_image *dom,
                                  xen_pfn_t l3pfn,
                                  xen_pfn_t l3mfn)
{
    xen_pfn_t new_l3mfn;
    struct xc_mmu *mmu;
    void *l3tab;
    int xc = dom->guest_xc;

    mmu = xc_alloc_mmu_updates(xc, dom->guest_domid);
    if ( mmu == NULL )
    {
        xc_dom_printf("%s: failed at %d\n", __FUNCTION__, __LINE__);
        return l3mfn;
    }

    xc_dom_unmap_one(dom, l3pfn);

    new_l3mfn = xc_make_page_below_4G(dom->guest_xc, dom->guest_domid, l3mfn);
    if ( !new_l3mfn )
        goto out;

    dom->p2m_host[l3pfn] = new_l3mfn;
    if ( xc_dom_update_guest_p2m(dom) != 0 )
        goto out;

    if ( xc_add_mmu_update(xc, mmu,
                           (((unsigned long long)new_l3mfn)
                            << XC_DOM_PAGE_SHIFT(dom)) |
                           MMU_MACHPHYS_UPDATE, l3pfn) )
        goto out;

    if ( xc_flush_mmu_updates(xc, mmu) )
        goto out;

    /*
     * This ensures that the entire pgtables_seg is mapped by a single
     * mmap region. arch_setup_bootlate() relies on this to be able to
     * unmap and pin the pagetables.
     */
    if ( xc_dom_seg_to_ptr(dom, &dom->pgtables_seg) == NULL )
        goto out;

    l3tab = xc_dom_pfn_to_ptr(dom, l3pfn, 1);
    memset(l3tab, 0, XC_DOM_PAGE_SIZE(dom));

    xc_dom_printf("%s: successfully relocated L3 below 4G. "
                  "(L3 PFN %#"PRIpfn" MFN %#"PRIpfn"=>%#"PRIpfn")\n",
                  __FUNCTION__, l3pfn, l3mfn, new_l3mfn);

    l3mfn = new_l3mfn;

 out:
    free(mmu);

    return l3mfn;
}

static int setup_pgtables_x86_32_pae(struct xc_dom_image *dom)
{
    xen_pfn_t l3pfn = dom->pgtables_seg.pfn;
    xen_pfn_t l2pfn = dom->pgtables_seg.pfn + dom->pg_l3;
    xen_pfn_t l1pfn = dom->pgtables_seg.pfn + dom->pg_l3 + dom->pg_l2;
    l3_pgentry_64_t *l3tab;
    l2_pgentry_64_t *l2tab = NULL;
    l1_pgentry_64_t *l1tab = NULL;
    unsigned long l3off, l2off, l1off;
    xen_vaddr_t addr;
    xen_pfn_t pgpfn;
    xen_pfn_t l3mfn = xc_dom_p2m_guest(dom, l3pfn);

    if ( dom->parms.pae == 1 )
    {
        if ( l3mfn >= 0x100000 )
            l3mfn = move_l3_below_4G(dom, l3pfn, l3mfn);

        if ( l3mfn >= 0x100000 )
        {
            xc_dom_panic(XC_INTERNAL_ERROR,"%s: cannot move L3 below 4G. "
                         "extended-cr3 not supported by guest. "
                         "(L3 PFN %#"PRIpfn" MFN %#"PRIpfn")\n",
                         __FUNCTION__, l3pfn, l3mfn);
            return -EINVAL;
        }
    }

    l3tab = xc_dom_pfn_to_ptr(dom, l3pfn, 1);

    for ( addr = dom->parms.virt_base; addr < dom->virt_pgtab_end;
          addr += PAGE_SIZE_X86 )
    {
        if ( l2tab == NULL )
        {
            /* get L2 tab, make L3 entry */
            l2tab = xc_dom_pfn_to_ptr(dom, l2pfn, 1);
            l3off = l3_table_offset_pae(addr);
            l3tab[l3off] =
                pfn_to_paddr(xc_dom_p2m_guest(dom, l2pfn)) | L3_PROT;
            l2pfn++;
        }

        if ( l1tab == NULL )
        {
            /* get L1 tab, make L2 entry */
            l1tab = xc_dom_pfn_to_ptr(dom, l1pfn, 1);
            l2off = l2_table_offset_pae(addr);
            l2tab[l2off] =
                pfn_to_paddr(xc_dom_p2m_guest(dom, l1pfn)) | L2_PROT;
            if ( l2off == (L2_PAGETABLE_ENTRIES_PAE - 1) )
                l2tab = NULL;
            l1pfn++;
        }

        /* make L1 entry */
        l1off = l1_table_offset_pae(addr);
        pgpfn = (addr - dom->parms.virt_base) >> PAGE_SHIFT_X86;
        l1tab[l1off] =
            pfn_to_paddr(xc_dom_p2m_guest(dom, pgpfn)) | L1_PROT;
        if ( (addr >= dom->pgtables_seg.vstart) &&
             (addr < dom->pgtables_seg.vend) )
            l1tab[l1off] &= ~_PAGE_RW; /* page tables are r/o */
        if ( l1off == (L1_PAGETABLE_ENTRIES_PAE - 1) )
            l1tab = NULL;
    }

    if ( dom->virt_pgtab_end <= 0xc0000000 )
    {
        xc_dom_printf("%s: PAE: extra l2 page table for l3#3\n", __FUNCTION__);
        l3tab[3] = pfn_to_paddr(xc_dom_p2m_guest(dom, l2pfn)) | L3_PROT;
    }
    return 0;
}

#undef L1_PROT
#undef L2_PROT
#undef L3_PROT

/* ------------------------------------------------------------------------ */
/* x86_64 pagetables                                                        */

static int count_pgtables_x86_64(struct xc_dom_image *dom)
{
    return count_pgtables(dom, 0,
                          L4_PAGETABLE_SHIFT_X86_64 + 9,
                          L4_PAGETABLE_SHIFT_X86_64,
                          L3_PAGETABLE_SHIFT_X86_64,
                          L2_PAGETABLE_SHIFT_X86_64);
}

#define L1_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED)
#define L2_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY|_PAGE_USER)
#define L3_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY|_PAGE_USER)
#define L4_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY|_PAGE_USER)

static int setup_pgtables_x86_64(struct xc_dom_image *dom)
{
    xen_pfn_t l4pfn = dom->pgtables_seg.pfn;
    xen_pfn_t l3pfn = dom->pgtables_seg.pfn + dom->pg_l4;
    xen_pfn_t l2pfn = dom->pgtables_seg.pfn + dom->pg_l4 + dom->pg_l3;
    xen_pfn_t l1pfn =
        dom->pgtables_seg.pfn + dom->pg_l4 + dom->pg_l3 + dom->pg_l2;
    l4_pgentry_64_t *l4tab = xc_dom_pfn_to_ptr(dom, l4pfn, 1);
    l3_pgentry_64_t *l3tab = NULL;
    l2_pgentry_64_t *l2tab = NULL;
    l1_pgentry_64_t *l1tab = NULL;
    uint64_t l4off, l3off, l2off, l1off;
    uint64_t addr;
    xen_pfn_t pgpfn;

    for ( addr = dom->parms.virt_base; addr < dom->virt_pgtab_end;
          addr += PAGE_SIZE_X86 )
    {
        if ( l3tab == NULL )
        {
            /* get L3 tab, make L4 entry */
            l3tab = xc_dom_pfn_to_ptr(dom, l3pfn, 1);
            l4off = l4_table_offset_x86_64(addr);
            l4tab[l4off] =
                pfn_to_paddr(xc_dom_p2m_guest(dom, l3pfn)) | L4_PROT;
            l3pfn++;
        }

        if ( l2tab == NULL )
        {
            /* get L2 tab, make L3 entry */
            l2tab = xc_dom_pfn_to_ptr(dom, l2pfn, 1);
            l3off = l3_table_offset_x86_64(addr);
            l3tab[l3off] =
                pfn_to_paddr(xc_dom_p2m_guest(dom, l2pfn)) | L3_PROT;
            if ( l3off == (L3_PAGETABLE_ENTRIES_X86_64 - 1) )
                l3tab = NULL;
            l2pfn++;
        }

        if ( l1tab == NULL )
        {
            /* get L1 tab, make L2 entry */
            l1tab = xc_dom_pfn_to_ptr(dom, l1pfn, 1);
            l2off = l2_table_offset_x86_64(addr);
            l2tab[l2off] =
                pfn_to_paddr(xc_dom_p2m_guest(dom, l1pfn)) | L2_PROT;
            if ( l2off == (L2_PAGETABLE_ENTRIES_X86_64 - 1) )
                l2tab = NULL;
            l1pfn++;
        }

        /* make L1 entry */
        l1off = l1_table_offset_x86_64(addr);
        pgpfn = (addr - dom->parms.virt_base) >> PAGE_SHIFT_X86;
        l1tab[l1off] =
            pfn_to_paddr(xc_dom_p2m_guest(dom, pgpfn)) | L1_PROT;
        if ( (addr >= dom->pgtables_seg.vstart) && 
             (addr < dom->pgtables_seg.vend) )
            l1tab[l1off] &= ~_PAGE_RW; /* page tables are r/o */
        if ( l1off == (L1_PAGETABLE_ENTRIES_X86_64 - 1) )
            l1tab = NULL;