61ff5602fe
This commit introduces integer underflow mitigation in max_addr calculation
in grub_relocator_alloc_chunk_align() invocation.
It consists of 2 fixes:
1. Introduced grub_relocator_alloc_chunk_align_safe() wrapper function to perform
sanity check for min/max and size values, and to make safe invocation of
grub_relocator_alloc_chunk_align() with validated max_addr value. Replace all
invocations such as grub_relocator_alloc_chunk_align(..., min_addr, max_addr - size, size, ...)
by grub_relocator_alloc_chunk_align_safe(..., min_addr, max_addr, size, ...).
2. Introduced UP_TO_TOP32(s) macro for the cases where max_addr is 32-bit top
address (0xffffffff - size + 1) or similar.
Signed-off-by: Alexey Makhalov <amakhalov@vmware.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
140 lines
4 KiB
C
140 lines
4 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009,2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/types.h>
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/cache.h>
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#include <grub/powerpc/relocator.h>
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#include <grub/relocator_private.h>
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extern grub_uint8_t grub_relocator_forward_start;
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extern grub_uint8_t grub_relocator_forward_end;
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extern grub_uint8_t grub_relocator_backward_start;
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extern grub_uint8_t grub_relocator_backward_end;
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#define REGW_SIZEOF (2 * sizeof (grub_uint32_t))
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#define JUMP_SIZEOF (sizeof (grub_uint32_t))
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#define RELOCATOR_SRC_SIZEOF(x) (&grub_relocator_##x##_end \
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- &grub_relocator_##x##_start)
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#define RELOCATOR_SIZEOF(x) (RELOCATOR_SRC_SIZEOF(x) \
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+ REGW_SIZEOF * 3)
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grub_size_t grub_relocator_align = sizeof (grub_uint32_t);
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grub_size_t grub_relocator_forward_size;
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grub_size_t grub_relocator_backward_size;
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grub_size_t grub_relocator_jumper_size = JUMP_SIZEOF + REGW_SIZEOF;
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void
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grub_cpu_relocator_init (void)
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{
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grub_relocator_forward_size = RELOCATOR_SIZEOF(forward);
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grub_relocator_backward_size = RELOCATOR_SIZEOF(backward);
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}
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static void
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write_reg (int regn, grub_uint32_t val, void **target)
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{
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/* lis r, val >> 16 */
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*(grub_uint32_t *) *target =
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((0x3c00 | (regn << 5)) << 16) | (val >> 16);
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*target = ((grub_uint32_t *) *target) + 1;
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/* ori r, r, val & 0xffff. */
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*(grub_uint32_t *) *target = (((0x6000 | regn << 5 | regn) << 16)
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| (val & 0xffff));
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*target = ((grub_uint32_t *) *target) + 1;
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}
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static void
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write_jump (void **target)
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{
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/* blr. */
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*(grub_uint32_t *) *target = 0x4e800020;
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*target = ((grub_uint32_t *) *target) + 1;
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}
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void
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grub_cpu_relocator_jumper (void *rels, grub_addr_t addr)
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{
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write_reg (GRUB_PPC_JUMP_REGISTER, addr, &rels);
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write_jump (&rels);
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}
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void
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grub_cpu_relocator_backward (void *ptr0, void *src, void *dest,
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grub_size_t size)
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{
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void *ptr = ptr0;
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write_reg (8, (grub_uint32_t) src, &ptr);
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write_reg (9, (grub_uint32_t) dest, &ptr);
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write_reg (10, (grub_uint32_t) size, &ptr);
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grub_memcpy (ptr, &grub_relocator_backward_start,
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RELOCATOR_SRC_SIZEOF (backward));
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}
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void
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grub_cpu_relocator_forward (void *ptr0, void *src, void *dest,
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grub_size_t size)
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{
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void *ptr = ptr0;
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write_reg (8, (grub_uint32_t) src, &ptr);
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write_reg (9, (grub_uint32_t) dest, &ptr);
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write_reg (10, (grub_uint32_t) size, &ptr);
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grub_memcpy (ptr, &grub_relocator_forward_start,
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RELOCATOR_SRC_SIZEOF (forward));
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}
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grub_err_t
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grub_relocator32_boot (struct grub_relocator *rel,
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struct grub_relocator32_state state)
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{
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void *ptr;
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grub_err_t err;
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void *relst;
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grub_size_t relsize;
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grub_size_t stateset_size = 32 * REGW_SIZEOF + JUMP_SIZEOF;
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unsigned i;
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grub_relocator_chunk_t ch;
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err = grub_relocator_alloc_chunk_align (rel, &ch, 0, UP_TO_TOP32 (stateset_size),
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stateset_size, sizeof (grub_uint32_t),
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GRUB_RELOCATOR_PREFERENCE_NONE, 0);
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if (err)
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return err;
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ptr = get_virtual_current_address (ch);
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for (i = 0; i < 32; i++)
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write_reg (i, state.gpr[i], &ptr);
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write_jump (&ptr);
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err = grub_relocator_prepare_relocs (rel, get_physical_target_address (ch),
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&relst, &relsize);
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if (err)
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return err;
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grub_arch_sync_caches ((void *) relst, relsize);
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((void (*) (void)) relst) ();
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/* Not reached. */
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return GRUB_ERR_NONE;
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}
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