7ea474c688
Disable the -Wadress-of-packaed-member diagnostic for the grub_cpio_find_file function since the result is found to be false postive. Any pointers to member of the 'struct head hd' is aligned even if the structure is packed without paddings. [ 59s] In file included from ../grub-core/fs/cpio.c:51: [ 59s] ../grub-core/fs/cpio_common.c: In function 'grub_cpio_find_file': [ 59s] ../grub-core/fs/cpio_common.c:58:31: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member] [ 59s] 58 | data->size = read_number (hd.filesize, ARRAY_SIZE (hd.filesize)); [ 59s] | ~~^~~~~~~~~ [ 59s] ../grub-core/fs/cpio_common.c:60:29: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member] [ 59s] 60 | *mtime = read_number (hd.mtime, ARRAY_SIZE (hd.mtime)); [ 59s] | ~~^~~~~~ [ 59s] ../grub-core/fs/cpio_common.c:61:28: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member] [ 59s] 61 | modeval = read_number (hd.mode, ARRAY_SIZE (hd.mode)); [ 59s] | ~~^~~~~ [ 59s] ../grub-core/fs/cpio_common.c:62:29: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member] [ 59s] 62 | namesize = read_number (hd.namesize, ARRAY_SIZE (hd.namesize)); [ 59s] | ~~^~~~~~~~~ [ 59s] In file included from ../grub-core/fs/cpio_be.c:51: [ 59s] ../grub-core/fs/cpio_common.c: In function 'grub_cpio_find_file': [ 59s] ../grub-core/fs/cpio_common.c:58:31: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member] [ 59s] 58 | data->size = read_number (hd.filesize, ARRAY_SIZE (hd.filesize)); [ 59s] | ~~^~~~~~~~~ [ 59s] ../grub-core/fs/cpio_common.c:60:29: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member] [ 59s] 60 | *mtime = read_number (hd.mtime, ARRAY_SIZE (hd.mtime)); [ 59s] | ~~^~~~~~ [ 59s] ../grub-core/fs/cpio_common.c:61:28: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member] [ 59s] 61 | modeval = read_number (hd.mode, ARRAY_SIZE (hd.mode)); [ 59s] | ~~^~~~~ [ 59s] ../grub-core/fs/cpio_common.c:62:29: error: taking address of packed member of 'struct head' may result in an unaligned pointer value [-Werror=address-of-packed-member] [ 59s] 62 | namesize = read_number (hd.namesize, ARRAY_SIZE (hd.namesize)); [ 59s] | ~~^~~~~~~~~ Signed-off-by: Michael Chang <mchang@suse.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
253 lines
5.7 KiB
C
253 lines
5.7 KiB
C
/* cpio.c - cpio and tar filesystem. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2007,2008,2009,2013 Free Software Foundation, Inc.
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*
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* This program 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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* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/file.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/disk.h>
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#include <grub/dl.h>
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#include <grub/i18n.h>
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#include <grub/archelp.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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struct grub_archelp_data
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{
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grub_disk_t disk;
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grub_off_t hofs;
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grub_off_t next_hofs;
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grub_off_t dofs;
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grub_off_t size;
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};
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#if __GNUC__ >= 9
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
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#endif
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static grub_err_t
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grub_cpio_find_file (struct grub_archelp_data *data, char **name,
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grub_int32_t *mtime, grub_uint32_t *mode)
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{
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struct head hd;
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grub_size_t namesize;
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grub_uint32_t modeval;
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data->hofs = data->next_hofs;
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if (grub_disk_read (data->disk, 0, data->hofs, sizeof (hd), &hd))
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return grub_errno;
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if (grub_memcmp (hd.magic, MAGIC, sizeof (hd.magic)) != 0
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#ifdef MAGIC2
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&& grub_memcmp (hd.magic, MAGIC2, sizeof (hd.magic)) != 0
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#endif
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)
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return grub_error (GRUB_ERR_BAD_FS, "invalid cpio archive");
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data->size = read_number (hd.filesize, ARRAY_SIZE (hd.filesize));
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if (mtime)
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*mtime = read_number (hd.mtime, ARRAY_SIZE (hd.mtime));
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modeval = read_number (hd.mode, ARRAY_SIZE (hd.mode));
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namesize = read_number (hd.namesize, ARRAY_SIZE (hd.namesize));
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/* Don't allow negative numbers. */
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if (namesize >= 0x80000000)
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{
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/* Probably a corruption, don't attempt to recover. */
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*mode = GRUB_ARCHELP_ATTR_END;
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return GRUB_ERR_NONE;
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}
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*mode = modeval;
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*name = grub_malloc (namesize + 1);
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if (*name == NULL)
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return grub_errno;
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if (grub_disk_read (data->disk, 0, data->hofs + sizeof (hd),
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namesize, *name))
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{
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grub_free (*name);
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return grub_errno;
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}
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(*name)[namesize] = 0;
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if (data->size == 0 && modeval == 0 && namesize == 11
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&& grub_memcmp(*name, "TRAILER!!!", 11) == 0)
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{
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*mode = GRUB_ARCHELP_ATTR_END;
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grub_free (*name);
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return GRUB_ERR_NONE;
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}
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data->dofs = data->hofs + ALIGN_CPIO (sizeof (hd) + namesize);
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data->next_hofs = data->dofs + ALIGN_CPIO (data->size);
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return GRUB_ERR_NONE;
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}
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#if __GNUC__ >= 9
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#pragma GCC diagnostic pop
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#endif
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static char *
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grub_cpio_get_link_target (struct grub_archelp_data *data)
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{
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char *ret;
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grub_err_t err;
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if (data->size == 0)
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return grub_strdup ("");
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ret = grub_malloc (data->size + 1);
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if (!ret)
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return NULL;
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err = grub_disk_read (data->disk, 0, data->dofs, data->size,
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ret);
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if (err)
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{
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grub_free (ret);
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return NULL;
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}
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ret[data->size] = '\0';
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return ret;
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}
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static void
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grub_cpio_rewind (struct grub_archelp_data *data)
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{
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data->next_hofs = 0;
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}
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static struct grub_archelp_ops arcops =
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{
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.find_file = grub_cpio_find_file,
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.get_link_target = grub_cpio_get_link_target,
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.rewind = grub_cpio_rewind
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};
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static struct grub_archelp_data *
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grub_cpio_mount (grub_disk_t disk)
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{
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struct head hd;
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struct grub_archelp_data *data;
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if (grub_disk_read (disk, 0, 0, sizeof (hd), &hd))
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goto fail;
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if (grub_memcmp (hd.magic, MAGIC, sizeof (MAGIC) - 1)
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#ifdef MAGIC2
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&& grub_memcmp (hd.magic, MAGIC2, sizeof (MAGIC2) - 1)
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#endif
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)
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goto fail;
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data = (struct grub_archelp_data *) grub_zalloc (sizeof (*data));
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if (!data)
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goto fail;
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data->disk = disk;
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return data;
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fail:
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grub_error (GRUB_ERR_BAD_FS, "not a " FSNAME " filesystem");
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return 0;
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}
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static grub_err_t
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grub_cpio_dir (grub_device_t device, const char *path_in,
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grub_fs_dir_hook_t hook, void *hook_data)
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{
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struct grub_archelp_data *data;
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grub_err_t err;
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data = grub_cpio_mount (device->disk);
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if (!data)
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return grub_errno;
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err = grub_archelp_dir (data, &arcops,
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path_in, hook, hook_data);
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grub_free (data);
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return err;
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}
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static grub_err_t
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grub_cpio_open (grub_file_t file, const char *name_in)
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{
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struct grub_archelp_data *data;
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grub_err_t err;
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data = grub_cpio_mount (file->device->disk);
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if (!data)
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return grub_errno;
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err = grub_archelp_open (data, &arcops, name_in);
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if (err)
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{
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grub_free (data);
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}
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else
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{
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file->data = data;
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file->size = data->size;
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}
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return err;
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}
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static grub_ssize_t
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grub_cpio_read (grub_file_t file, char *buf, grub_size_t len)
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{
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struct grub_archelp_data *data;
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grub_ssize_t ret;
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data = file->data;
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data->disk->read_hook = file->read_hook;
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data->disk->read_hook_data = file->read_hook_data;
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ret = (grub_disk_read (data->disk, 0, data->dofs + file->offset,
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len, buf)) ? -1 : (grub_ssize_t) len;
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data->disk->read_hook = 0;
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return ret;
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}
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static grub_err_t
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grub_cpio_close (grub_file_t file)
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{
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struct grub_archelp_data *data;
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data = file->data;
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grub_free (data);
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return grub_errno;
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}
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static struct grub_fs grub_cpio_fs = {
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.name = FSNAME,
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.fs_dir = grub_cpio_dir,
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.fs_open = grub_cpio_open,
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.fs_read = grub_cpio_read,
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.fs_close = grub_cpio_close,
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#ifdef GRUB_UTIL
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.reserved_first_sector = 0,
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.blocklist_install = 0,
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#endif
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};
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