c69d1858f1
When loading a Xen pv-kernel avoid memory leaks in case of errors. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
370 lines
9.9 KiB
C
370 lines
9.9 KiB
C
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 2013 Free Software Foundation, Inc.
|
|
*
|
|
* GRUB is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GRUB is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <grub/xen_file.h>
|
|
#include <grub/misc.h>
|
|
|
|
static grub_err_t
|
|
parse_xen_guest (grub_elf_t elf, struct grub_xen_file_info *xi,
|
|
grub_off_t off, grub_size_t sz)
|
|
{
|
|
char *buf;
|
|
char *ptr;
|
|
int has_paddr = 0;
|
|
|
|
grub_errno = GRUB_ERR_NONE;
|
|
if (grub_file_seek (elf->file, off) == (grub_off_t) -1)
|
|
return grub_errno;
|
|
buf = grub_malloc (sz);
|
|
if (!buf)
|
|
return grub_errno;
|
|
|
|
if (grub_file_read (elf->file, buf, sz) != (grub_ssize_t) sz)
|
|
{
|
|
if (grub_errno)
|
|
goto out;
|
|
grub_free (buf);
|
|
return grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
|
|
elf->file->name);
|
|
}
|
|
xi->has_xen_guest = 1;
|
|
for (ptr = buf; ptr && ptr - buf < (grub_ssize_t) sz;
|
|
ptr = grub_strchr (ptr, ','), (ptr ? ptr++ : 0))
|
|
{
|
|
if (grub_strncmp (ptr, "PAE=no,", sizeof ("PAE=no,") - 1) == 0)
|
|
{
|
|
if (xi->arch != GRUB_XEN_FILE_I386
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE_BIMODE)
|
|
continue;
|
|
xi->arch = GRUB_XEN_FILE_I386;
|
|
continue;
|
|
}
|
|
|
|
if (grub_strncmp (ptr, "PAE=yes,", sizeof ("PAE=yes,") - 1) == 0)
|
|
{
|
|
if (xi->arch != GRUB_XEN_FILE_I386
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE_BIMODE)
|
|
continue;
|
|
xi->arch = GRUB_XEN_FILE_I386_PAE;
|
|
continue;
|
|
}
|
|
|
|
if (grub_strncmp (ptr, "PAE=yes[extended-cr3],",
|
|
sizeof ("PAE=yes[extended-cr3],") - 1) == 0)
|
|
{
|
|
if (xi->arch != GRUB_XEN_FILE_I386
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE_BIMODE)
|
|
continue;
|
|
xi->arch = GRUB_XEN_FILE_I386_PAE;
|
|
xi->extended_cr3 = 1;
|
|
continue;
|
|
}
|
|
|
|
if (grub_strncmp (ptr, "PAE=bimodal,", sizeof ("PAE=bimodal,") - 1) == 0)
|
|
{
|
|
if (xi->arch != GRUB_XEN_FILE_I386
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE_BIMODE)
|
|
continue;
|
|
xi->arch = GRUB_XEN_FILE_I386_PAE_BIMODE;
|
|
continue;
|
|
}
|
|
|
|
if (grub_strncmp (ptr, "PAE=bimodal[extended-cr3],",
|
|
sizeof ("PAE=bimodal[extended-cr3],") - 1) == 0)
|
|
{
|
|
if (xi->arch != GRUB_XEN_FILE_I386
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE_BIMODE)
|
|
continue;
|
|
xi->arch = GRUB_XEN_FILE_I386_PAE_BIMODE;
|
|
xi->extended_cr3 = 1;
|
|
continue;
|
|
}
|
|
|
|
if (grub_strncmp (ptr, "PAE=yes,bimodal,", sizeof ("PAE=yes,bimodal,") - 1) == 0)
|
|
{
|
|
if (xi->arch != GRUB_XEN_FILE_I386
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE_BIMODE)
|
|
continue;
|
|
xi->arch = GRUB_XEN_FILE_I386_PAE_BIMODE;
|
|
continue;
|
|
}
|
|
|
|
if (grub_strncmp (ptr, "PAE=yes[extended-cr3],bimodal,",
|
|
sizeof ("PAE=yes[extended-cr3],bimodal,") - 1) == 0)
|
|
{
|
|
if (xi->arch != GRUB_XEN_FILE_I386
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE_BIMODE)
|
|
continue;
|
|
xi->arch = GRUB_XEN_FILE_I386_PAE_BIMODE;
|
|
xi->extended_cr3 = 1;
|
|
continue;
|
|
}
|
|
|
|
if (grub_strncmp (ptr, "VIRT_BASE=", sizeof ("VIRT_BASE=") - 1) == 0)
|
|
{
|
|
xi->virt_base = grub_strtoull (ptr + sizeof ("VIRT_BASE=") - 1, &ptr, 16);
|
|
if (grub_errno)
|
|
goto out;
|
|
continue;
|
|
}
|
|
if (grub_strncmp (ptr, "VIRT_ENTRY=", sizeof ("VIRT_ENTRY=") - 1) == 0)
|
|
{
|
|
xi->entry_point = grub_strtoull (ptr + sizeof ("VIRT_ENTRY=") - 1, &ptr, 16);
|
|
if (grub_errno)
|
|
goto out;
|
|
continue;
|
|
}
|
|
if (grub_strncmp (ptr, "HYPERCALL_PAGE=", sizeof ("HYPERCALL_PAGE=") - 1) == 0)
|
|
{
|
|
xi->hypercall_page = grub_strtoull (ptr + sizeof ("HYPERCALL_PAGE=") - 1, &ptr, 16);
|
|
xi->has_hypercall_page = 1;
|
|
if (grub_errno)
|
|
goto out;
|
|
continue;
|
|
}
|
|
if (grub_strncmp (ptr, "ELF_PADDR_OFFSET=", sizeof ("ELF_PADDR_OFFSET=") - 1) == 0)
|
|
{
|
|
xi->paddr_offset = grub_strtoull (ptr + sizeof ("ELF_PADDR_OFFSET=") - 1, &ptr, 16);
|
|
has_paddr = 1;
|
|
if (grub_errno)
|
|
goto out;
|
|
continue;
|
|
}
|
|
}
|
|
if (xi->has_hypercall_page)
|
|
xi->hypercall_page = (xi->hypercall_page << 12) + xi->virt_base;
|
|
if (!has_paddr)
|
|
xi->paddr_offset = xi->virt_base;
|
|
|
|
out:
|
|
grub_free (buf);
|
|
|
|
return grub_errno;
|
|
}
|
|
|
|
#pragma GCC diagnostic ignored "-Wcast-align"
|
|
|
|
static grub_err_t
|
|
parse_note (grub_elf_t elf, struct grub_xen_file_info *xi,
|
|
grub_off_t off, grub_size_t sz)
|
|
{
|
|
grub_uint32_t *buf;
|
|
grub_uint32_t *ptr;
|
|
if (grub_file_seek (elf->file, off) == (grub_off_t) -1)
|
|
return grub_errno;
|
|
buf = grub_malloc (sz);
|
|
if (!buf)
|
|
return grub_errno;
|
|
|
|
if (grub_file_read (elf->file, buf, sz) != (grub_ssize_t) sz)
|
|
{
|
|
if (grub_errno)
|
|
return grub_errno;
|
|
return grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
|
|
elf->file->name);
|
|
}
|
|
for (ptr = buf; ptr - buf < (grub_ssize_t) (sz / sizeof (grub_uint32_t));)
|
|
{
|
|
Elf_Nhdr *nh = (Elf_Nhdr *) ptr;
|
|
char *name;
|
|
grub_uint32_t *desc;
|
|
grub_uint32_t namesz, descsz;
|
|
ptr += sizeof (*nh) / sizeof (grub_uint32_t);
|
|
name = (char *) ptr;
|
|
namesz = grub_le_to_cpu32 (nh->n_namesz);
|
|
descsz = grub_le_to_cpu32 (nh->n_descsz);
|
|
ptr += (namesz + 3) / 4;
|
|
desc = ptr;
|
|
ptr += (grub_le_to_cpu32 (nh->n_descsz) + 3) / 4;
|
|
if ((namesz < 3) || grub_memcmp (name, "Xen", namesz == 3 ? 3 : 4) != 0)
|
|
continue;
|
|
xi->has_note = 1;
|
|
switch (nh->n_type)
|
|
{
|
|
case 1:
|
|
xi->entry_point = grub_le_to_cpu_addr (*(Elf_Addr *) desc);
|
|
break;
|
|
case 2:
|
|
xi->hypercall_page = grub_le_to_cpu_addr (*(Elf_Addr *) desc);
|
|
xi->has_hypercall_page = 1;
|
|
break;
|
|
case 3:
|
|
xi->virt_base = grub_le_to_cpu_addr (*(Elf_Addr *) desc);
|
|
break;
|
|
case 4:
|
|
xi->paddr_offset = grub_le_to_cpu_addr (*(Elf_Addr *) desc);
|
|
break;
|
|
case 5:
|
|
grub_dprintf ("xen", "xenversion = `%s'\n", (char *) desc);
|
|
break;
|
|
case 6:
|
|
grub_dprintf ("xen", "name = `%s'\n", (char *) desc);
|
|
break;
|
|
case 7:
|
|
grub_dprintf ("xen", "version = `%s'\n", (char *) desc);
|
|
break;
|
|
case 8:
|
|
if (descsz < 7
|
|
|| grub_memcmp (desc, "generic", descsz == 7 ? 7 : 8) != 0)
|
|
return grub_error (GRUB_ERR_BAD_OS, "invalid loader");
|
|
break;
|
|
/* PAE */
|
|
case 9:
|
|
grub_dprintf ("xen", "pae = `%s', %d, %d\n", (char *) desc,
|
|
xi->arch, descsz);
|
|
if (xi->arch != GRUB_XEN_FILE_I386
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE
|
|
&& xi->arch != GRUB_XEN_FILE_I386_PAE_BIMODE)
|
|
break;
|
|
if (descsz >= 3 && grub_memcmp (desc, "yes",
|
|
descsz == 3 ? 3 : 4) == 0)
|
|
{
|
|
xi->extended_cr3 = 1;
|
|
xi->arch = GRUB_XEN_FILE_I386_PAE;
|
|
}
|
|
if (descsz >= 7 && grub_memcmp (desc, "bimodal",
|
|
descsz == 7 ? 7 : 8) == 0)
|
|
{
|
|
xi->extended_cr3 = 1;
|
|
xi->arch = GRUB_XEN_FILE_I386_PAE_BIMODE;
|
|
}
|
|
if (descsz >= 11 && grub_memcmp (desc, "yes,bimodal",
|
|
descsz == 11 ? 11 : 12) == 0)
|
|
{
|
|
xi->extended_cr3 = 1;
|
|
xi->arch = GRUB_XEN_FILE_I386_PAE_BIMODE;
|
|
}
|
|
if (descsz >= 2 && grub_memcmp (desc, "no",
|
|
descsz == 2 ? 2 : 3) == 0)
|
|
xi->arch = GRUB_XEN_FILE_I386;
|
|
break;
|
|
default:
|
|
grub_dprintf ("xen", "unknown note type %d\n", nh->n_type);
|
|
break;
|
|
}
|
|
}
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
grub_err_t
|
|
grub_xen_get_infoXX (grub_elf_t elf, struct grub_xen_file_info *xi)
|
|
{
|
|
Elf_Shdr *s, *s0;
|
|
grub_size_t shnum = elf->ehdr.ehdrXX.e_shnum;
|
|
grub_size_t shentsize = elf->ehdr.ehdrXX.e_shentsize;
|
|
grub_size_t shsize = shnum * shentsize;
|
|
grub_off_t stroff;
|
|
grub_err_t err;
|
|
Elf_Phdr *phdr;
|
|
|
|
xi->kern_end = 0;
|
|
xi->kern_start = ~0;
|
|
xi->entry_point = elf->ehdr.ehdrXX.e_entry;
|
|
|
|
/* FIXME: check note. */
|
|
FOR_ELF_PHDRS (elf, phdr)
|
|
{
|
|
Elf_Addr paddr;
|
|
|
|
if (phdr->p_type == PT_NOTE)
|
|
{
|
|
err = parse_note (elf, xi, phdr->p_offset, phdr->p_filesz);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (phdr->p_type != PT_LOAD)
|
|
continue;
|
|
|
|
paddr = phdr->p_paddr;
|
|
|
|
if (paddr < xi->kern_start)
|
|
xi->kern_start = paddr;
|
|
|
|
if (paddr + phdr->p_memsz > xi->kern_end)
|
|
xi->kern_end = paddr + phdr->p_memsz;
|
|
}
|
|
|
|
if (xi->has_note)
|
|
return GRUB_ERR_NONE;
|
|
|
|
if (!shnum || !shentsize)
|
|
return grub_error (GRUB_ERR_BAD_OS, "no XEN note");
|
|
|
|
s0 = grub_malloc (shsize);
|
|
if (!s0)
|
|
return grub_errno;
|
|
|
|
if (grub_file_seek (elf->file, elf->ehdr.ehdrXX.e_shoff) == (grub_off_t) -1)
|
|
{
|
|
err = grub_errno;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (grub_file_read (elf->file, s0, shsize) != (grub_ssize_t) shsize)
|
|
{
|
|
if (grub_errno)
|
|
err = grub_errno;
|
|
else
|
|
err = grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
|
|
elf->file->name);
|
|
goto cleanup;
|
|
}
|
|
|
|
s = (Elf_Shdr *) ((char *) s0 + elf->ehdr.ehdrXX.e_shstrndx * shentsize);
|
|
stroff = s->sh_offset;
|
|
|
|
for (s = s0; s < (Elf_Shdr *) ((char *) s0 + shnum * shentsize);
|
|
s = (Elf_Shdr *) ((char *) s + shentsize))
|
|
{
|
|
char name[sizeof("__xen_guest")];
|
|
grub_memset (name, 0, sizeof (name));
|
|
if (grub_file_seek (elf->file, stroff + s->sh_name) == (grub_off_t) -1)
|
|
{
|
|
err = grub_errno;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (grub_file_read (elf->file, name, sizeof (name)) != (grub_ssize_t) sizeof (name))
|
|
{
|
|
if (grub_errno)
|
|
{
|
|
err = grub_errno;
|
|
goto cleanup;
|
|
}
|
|
continue;
|
|
}
|
|
if (grub_memcmp (name, "__xen_guest",
|
|
sizeof("__xen_guest")) != 0)
|
|
continue;
|
|
err = parse_xen_guest (elf, xi, s->sh_offset, s->sh_size);
|
|
goto cleanup;
|
|
}
|
|
err = grub_error (GRUB_ERR_BAD_OS, "no XEN note found");
|
|
|
|
cleanup:
|
|
grub_free (s0);
|
|
return err;
|
|
}
|