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openSUSE:Leap:15.3
grub2.27717
grub2-grubenv-in-btrfs-header.patch
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File grub2-grubenv-in-btrfs-header.patch of Package grub2.27717
GRUB cannot write Btrfs file systems from the bootloader, so it cannot modify values set from userspace (e.g. "next_entry" set by grub2-once). As a workaround use the Btrfs header to store known data of the GRUB environment block. v2: export env_block and make sure to use the device of grubenv v3: * Use xcalloc for overflow check and return NULL when it would occur. --- Index: grub-2.02/grub-core/kern/fs.c =================================================================== --- grub-2.02.orig/grub-core/kern/fs.c +++ grub-2.02/grub-core/kern/fs.c @@ -27,6 +27,7 @@ #include <grub/mm.h> #include <grub/term.h> #include <grub/i18n.h> +#include <grub/partition.h> grub_fs_t grub_fs_list = 0; @@ -228,6 +229,13 @@ grub_fs_blocklist_read (grub_file_t file size, buf) != GRUB_ERR_NONE) return -1; + if (file->read_hook) + { + grub_disk_addr_t part_start; + + part_start = grub_partition_get_start (file->device->disk->partition); + file->read_hook (p->offset + sector + part_start, (unsigned)offset, (unsigned)size, file->read_hook_data); + } ret += size; len -= size; sector -= ((size + offset) >> GRUB_DISK_SECTOR_BITS); Index: grub-2.02/util/grub-editenv.c =================================================================== --- grub-2.02.orig/util/grub-editenv.c +++ grub-2.02/util/grub-editenv.c @@ -23,8 +23,11 @@ #include <grub/util/misc.h> #include <grub/lib/envblk.h> #include <grub/i18n.h> -#include <grub/emu/hostfile.h> +#include <grub/emu/hostdisk.h> #include <grub/util/install.h> +#include <grub/emu/getroot.h> +#include <grub/fs.h> +#include <grub/crypto.h> #include <stdio.h> #include <unistd.h> @@ -120,6 +123,140 @@ block, use `rm %s'."), NULL, help_filter, NULL }; +struct fs_envblk_spec { + const char *fs_name; + int offset; + int size; +} fs_envblk_spec[] = { + { "btrfs", 256 * 1024, GRUB_DISK_SECTOR_SIZE }, + { NULL, 0, 0 } +}; + +struct fs_envblk { + struct fs_envblk_spec *spec; + const char *dev; +}; + +typedef struct fs_envblk_spec *fs_envblk_spec_t; +typedef struct fs_envblk *fs_envblk_t; + +fs_envblk_t fs_envblk = NULL; + +static int +read_envblk_fs (const char *varname, const char *value, void *hook_data) +{ + grub_envblk_t *p_envblk = (grub_envblk_t *)hook_data; + + if (!p_envblk || !fs_envblk) + return 0; + + if (strcmp (varname, "env_block") == 0) + { + int off, sz; + char *p; + + off = strtol (value, &p, 10); + if (*p == '+') + sz = strtol (p+1, &p, 10); + + if (*p == '\0') + { + FILE *fp; + char *buf; + + off <<= GRUB_DISK_SECTOR_BITS; + sz <<= GRUB_DISK_SECTOR_BITS; + + fp = grub_util_fopen (fs_envblk->dev, "rb"); + if (! fp) + grub_util_error (_("cannot open `%s': %s"), fs_envblk->dev, + strerror (errno)); + + + if (fseek (fp, off, SEEK_SET) < 0) + grub_util_error (_("cannot seek `%s': %s"), fs_envblk->dev, + strerror (errno)); + + buf = xmalloc (sz); + if ((fread (buf, 1, sz, fp)) != sz) + grub_util_error (_("cannot read `%s': %s"), fs_envblk->dev, + strerror (errno)); + + fclose (fp); + + *p_envblk = grub_envblk_open (buf, sz); + } + } + + return 0; +} + +static void +create_envblk_fs (void) +{ + FILE *fp; + char *buf; + const char *device; + int offset, size; + + if (!fs_envblk) + return; + + device = fs_envblk->dev; + offset = fs_envblk->spec->offset; + size = fs_envblk->spec->size; + + fp = grub_util_fopen (device, "r+b"); + if (! fp) + grub_util_error (_("cannot open `%s': %s"), device, strerror (errno)); + + buf = xmalloc (size); + memcpy (buf, GRUB_ENVBLK_SIGNATURE, sizeof (GRUB_ENVBLK_SIGNATURE) - 1); + memset (buf + sizeof (GRUB_ENVBLK_SIGNATURE) - 1, '#', size - sizeof (GRUB_ENVBLK_SIGNATURE) + 1); + + if (fseek (fp, offset, SEEK_SET) < 0) + grub_util_error (_("cannot seek `%s': %s"), device, strerror (errno)); + + if (fwrite (buf, 1, size, fp) != size) + grub_util_error (_("cannot write to `%s': %s"), device, strerror (errno)); + + grub_util_file_sync (fp); + free (buf); + fclose (fp); +} + +static grub_envblk_t +open_envblk_fs (grub_envblk_t envblk) +{ + grub_envblk_t envblk_fs = NULL; + char *val; + int offset, size; + + if (!fs_envblk) + return NULL; + + offset = fs_envblk->spec->offset; + size = fs_envblk->spec->size; + + grub_envblk_iterate (envblk, &envblk_fs, read_envblk_fs); + + if (envblk_fs && grub_envblk_size (envblk_fs) == size) + return envblk_fs; + + create_envblk_fs (); + + offset = offset >> GRUB_DISK_SECTOR_BITS; + size = (size + GRUB_DISK_SECTOR_SIZE - 1) >> GRUB_DISK_SECTOR_BITS; + + val = xasprintf ("%d+%d", offset, size); + if (! grub_envblk_set (envblk, "env_block", val)) + grub_util_error ("%s", _("environment block too small")); + grub_envblk_iterate (envblk, &envblk_fs, read_envblk_fs); + free (val); + + return envblk_fs; +} + static grub_envblk_t open_envblk_file (const char *name) { @@ -176,10 +313,17 @@ static void list_variables (const char *name) { grub_envblk_t envblk; + grub_envblk_t envblk_fs = NULL; envblk = open_envblk_file (name); + grub_envblk_iterate (envblk, &envblk_fs, read_envblk_fs); grub_envblk_iterate (envblk, NULL, print_var); grub_envblk_close (envblk); + if (envblk_fs) + { + grub_envblk_iterate (envblk_fs, NULL, print_var); + grub_envblk_close (envblk_fs); + } } static void @@ -202,6 +346,38 @@ write_envblk (const char *name, grub_env } static void +write_envblk_fs (grub_envblk_t envblk) +{ + FILE *fp; + const char *device; + int offset, size; + + if (!fs_envblk) + return; + + device = fs_envblk->dev; + offset = fs_envblk->spec->offset; + size = fs_envblk->spec->size; + + if (grub_envblk_size (envblk) > size) + grub_util_error ("%s", _("environment block too small")); + + fp = grub_util_fopen (device, "r+b"); + + if (! fp) + grub_util_error (_("cannot open `%s': %s"), device, strerror (errno)); + + if (fseek (fp, offset, SEEK_SET) < 0) + grub_util_error (_("cannot seek `%s': %s"), device, strerror (errno)); + + if (fwrite (grub_envblk_buffer (envblk), 1, grub_envblk_size (envblk), fp) != grub_envblk_size (envblk)) + grub_util_error (_("cannot write to `%s': %s"), device, strerror (errno)); + + grub_util_file_sync (fp); + fclose (fp); +} + +static void set_variables (const char *name, int argc, char *argv[]) { grub_envblk_t envblk; @@ -217,8 +393,27 @@ set_variables (const char *name, int arg *(p++) = 0; - if (! grub_envblk_set (envblk, argv[0], p)) - grub_util_error ("%s", _("environment block too small")); + if ((strcmp (argv[0], "next_entry") == 0 || + strcmp (argv[0], "health_checker_flag") == 0) && fs_envblk) + { + grub_envblk_t envblk_fs; + envblk_fs = open_envblk_fs (envblk); + if (!envblk_fs) + grub_util_error ("%s", _("can't open fs environment block")); + if (! grub_envblk_set (envblk_fs, argv[0], p)) + grub_util_error ("%s", _("environment block too small")); + write_envblk_fs (envblk_fs); + grub_envblk_close (envblk_fs); + } + else if (strcmp (argv[0], "env_block") == 0) + { + grub_util_warn ("can't set env_block as it's read-only"); + } + else + { + if (! grub_envblk_set (envblk, argv[0], p)) + grub_util_error ("%s", _("environment block too small")); + } argc--; argv++; @@ -226,26 +421,158 @@ set_variables (const char *name, int arg write_envblk (name, envblk); grub_envblk_close (envblk); + } static void unset_variables (const char *name, int argc, char *argv[]) { grub_envblk_t envblk; + grub_envblk_t envblk_fs; envblk = open_envblk_file (name); + + envblk_fs = NULL; + if (fs_envblk) + envblk_fs = open_envblk_fs (envblk); + while (argc) { grub_envblk_delete (envblk, argv[0]); + if (envblk_fs) + grub_envblk_delete (envblk_fs, argv[0]); + argc--; argv++; } write_envblk (name, envblk); grub_envblk_close (envblk); + + if (envblk_fs) + { + write_envblk_fs (envblk_fs); + grub_envblk_close (envblk_fs); + } +} + +int have_abstraction = 0; +static void +probe_abstraction (grub_disk_t disk) +{ + if (disk->partition == NULL) + grub_util_info ("no partition map found for %s", disk->name); + + if (disk->dev->id == GRUB_DISK_DEVICE_DISKFILTER_ID || + disk->dev->id == GRUB_DISK_DEVICE_CRYPTODISK_ID) + { + have_abstraction = 1; + } } +static fs_envblk_t +probe_fs_envblk (fs_envblk_spec_t spec) +{ + char **grub_devices; + char **curdev, **curdrive; + size_t ndev = 0; + char **grub_drives; + grub_device_t grub_dev = NULL; + grub_fs_t grub_fs; + const char *fs_envblk_device; + +#ifdef __s390x__ + return NULL; +#endif + + grub_util_biosdisk_init (DEFAULT_DEVICE_MAP); + grub_init_all (); + grub_gcry_init_all (); + + grub_lvm_fini (); + grub_mdraid09_fini (); + grub_mdraid1x_fini (); + grub_diskfilter_fini (); + grub_diskfilter_init (); + grub_mdraid09_init (); + grub_mdraid1x_init (); + grub_lvm_init (); + + grub_devices = grub_guess_root_devices (DEFAULT_DIRECTORY); + + if (!grub_devices || !grub_devices[0]) + grub_util_error (_("cannot find a device for %s (is /dev mounted?)"), DEFAULT_DIRECTORY); + + fs_envblk_device = grub_devices[0]; + + for (curdev = grub_devices; *curdev; curdev++) + { + grub_util_pull_device (*curdev); + ndev++; + } + + grub_drives = xcalloc ((ndev + 1), sizeof (grub_drives[0])); + + for (curdev = grub_devices, curdrive = grub_drives; *curdev; curdev++, + curdrive++) + { + *curdrive = grub_util_get_grub_dev (*curdev); + if (! *curdrive) + grub_util_error (_("cannot find a GRUB drive for %s. Check your device.map"), + *curdev); + } + *curdrive = 0; + + grub_dev = grub_device_open (grub_drives[0]); + if (! grub_dev) + grub_util_error ("%s", grub_errmsg); + + grub_fs = grub_fs_probe (grub_dev); + if (! grub_fs) + grub_util_error ("%s", grub_errmsg); + + if (grub_dev->disk) + { + probe_abstraction (grub_dev->disk); + } + for (curdrive = grub_drives + 1; *curdrive; curdrive++) + { + grub_device_t dev = grub_device_open (*curdrive); + if (!dev) + continue; + if (dev->disk) + probe_abstraction (dev->disk); + grub_device_close (dev); + } + + free (grub_drives); + grub_device_close (grub_dev); + grub_gcry_fini_all (); + grub_fini_all (); + grub_util_biosdisk_fini (); + + fs_envblk_spec_t p; + + for (p = spec; p->fs_name; p++) + { + if (strcmp (grub_fs->name, p->fs_name) == 0 && !have_abstraction) + { + if (p->offset % GRUB_DISK_SECTOR_SIZE == 0 && + p->size % GRUB_DISK_SECTOR_SIZE == 0) + { + fs_envblk = xmalloc (sizeof (fs_envblk_t)); + fs_envblk->spec = p; + fs_envblk->dev = strdup(fs_envblk_device); + return fs_envblk; + } + } + } + + return NULL; +} + + int main (int argc, char *argv[]) { @@ -277,6 +604,9 @@ main (int argc, char *argv[]) command = argv[curindex++]; } + if (strcmp (filename, DEFAULT_ENVBLK_PATH) == 0) + fs_envblk = probe_fs_envblk (fs_envblk_spec); + if (strcmp (command, "create") == 0) grub_util_create_envblk_file (filename); else if (strcmp (command, "list") == 0) Index: grub-2.02/util/grub.d/00_header.in =================================================================== --- grub-2.02.orig/util/grub.d/00_header.in +++ grub-2.02/util/grub.d/00_header.in @@ -46,6 +46,13 @@ cat << EOF if [ -s \$prefix/grubenv ]; then load_env fi + +if [ "\${env_block}" ] ; then + set env_block="(\${root})\${env_block}" + export env_block + load_env -f "\${env_block}" +fi + EOF if [ "x$GRUB_BUTTON_CMOS_ADDRESS" != "x" ]; then cat <<EOF @@ -55,6 +62,9 @@ elif [ "\${next_entry}" ] ; then set default="\${next_entry}" set next_entry= save_env next_entry + if [ "\${env_block}" ] ; then + save_env -f "\${env_block}" next_entry + fi set boot_once=true else set default="${GRUB_DEFAULT}" @@ -66,6 +76,9 @@ if [ "\${next_entry}" ] ; then set default="\${next_entry}" set next_entry= save_env next_entry + if [ "\${env_block}" ] ; then + save_env -f "\${env_block}" next_entry + fi set boot_once=true else set default="${GRUB_DEFAULT}" @@ -93,7 +106,12 @@ fi function savedefault { if [ -z "\${boot_once}" ]; then saved_entry="\${chosen}" - save_env saved_entry + if [ "\${env_block}" ] ; then + save_env -f "\${env_block}" saved_entry + else + save_env saved_entry + fi + fi }
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