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grub2.27716
0001-Warn-if-MBR-gap-is-small-and-user-uses-adv...
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File 0001-Warn-if-MBR-gap-is-small-and-user-uses-advanced-modu.patch of Package grub2.27716
From 53e9a353dbc5110039bc229e271ea60f7bc5bd69 Mon Sep 17 00:00:00 2001 From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com> Date: Mon, 27 Apr 2020 17:51:34 +0200 Subject: [PATCH 1/2] Warn if MBR gap is small and user uses advanced modules We don't want to support small MBR gap in pair with anything but the simplest config of biosdisk+part_msdos+simple filesystem. In this path "simple filesystems" are all current filesystems except zfs and btrfs. --- grub-core/partmap/gpt.c | 9 ++++++++- grub-core/partmap/msdos.c | 7 ++++++- include/grub/partition.h | 4 +++- include/grub/util/install.h | 7 +++++-- util/grub-install-common.c | 25 +++++++++++++++++++++++++ util/grub-install.c | 13 +++++++++---- util/grub-setup.c | 2 +- util/setup.c | 5 +++-- 8 files changed, 60 insertions(+), 12 deletions(-) diff --git a/grub-core/partmap/gpt.c b/grub-core/partmap/gpt.c index 72a2e37cd..20cbcc7ff 100644 --- a/grub-core/partmap/gpt.c +++ b/grub-core/partmap/gpt.c @@ -25,6 +25,9 @@ #include <grub/msdos_partition.h> #include <grub/gpt_partition.h> #include <grub/i18n.h> +#ifdef GRUB_UTIL +#include <grub/emu/misc.h> +#endif GRUB_MOD_LICENSE ("GPLv3+"); @@ -169,7 +172,8 @@ static grub_err_t gpt_partition_map_embed (struct grub_disk *disk, unsigned int *nsectors, unsigned int max_nsectors, grub_embed_type_t embed_type, - grub_disk_addr_t **sectors) + grub_disk_addr_t **sectors, + int warn_short) { struct gpt_partition_map_embed_ctx ctx = { .start = 0, @@ -191,6 +195,9 @@ gpt_partition_map_embed (struct grub_disk *disk, unsigned int *nsectors, N_("this GPT partition label contains no BIOS Boot Partition;" " embedding won't be possible")); + if (ctx.len < GRUB_MIN_RECOMMENDED_MBRGAP) { + grub_util_warn("Your BIOS Boot Partition is under 1 MiB, please increase its size."); + } if (ctx.len < *nsectors) return grub_error (GRUB_ERR_OUT_OF_RANGE, N_("your BIOS Boot Partition is too small;" diff --git a/grub-core/partmap/msdos.c b/grub-core/partmap/msdos.c index 508f0ff76..fb452d5fc 100644 --- a/grub-core/partmap/msdos.c +++ b/grub-core/partmap/msdos.c @@ -243,7 +243,8 @@ static grub_err_t pc_partition_map_embed (struct grub_disk *disk, unsigned int *nsectors, unsigned int max_nsectors, grub_embed_type_t embed_type, - grub_disk_addr_t **sectors) + grub_disk_addr_t **sectors, + int warn_short) { grub_disk_addr_t end = ~0ULL; struct grub_msdos_partition_mbr mbr; @@ -397,6 +398,10 @@ pc_partition_map_embed (struct grub_disk *disk, unsigned int *nsectors, return GRUB_ERR_NONE; } + if (end < GRUB_MIN_RECOMMENDED_MBRGAP && warn_short) { + grub_util_warn("You have a short MBR gap and use advanced config. Please increase post-MBR gap"); + } + if (end <= 1) return grub_error (GRUB_ERR_FILE_NOT_FOUND, N_("this msdos-style partition label has no " diff --git a/include/grub/partition.h b/include/grub/partition.h index 7adb7ec6e..adc50d680 100644 --- a/include/grub/partition.h +++ b/include/grub/partition.h @@ -52,10 +52,12 @@ struct grub_partition_map grub_partition_iterate_hook_t hook, void *hook_data); #ifdef GRUB_UTIL /* Determine sectors available for embedding. */ +#define GRUB_MIN_RECOMMENDED_MBRGAP 1900 grub_err_t (*embed) (struct grub_disk *disk, unsigned int *nsectors, unsigned int max_nsectors, grub_embed_type_t embed_type, - grub_disk_addr_t **sectors); + grub_disk_addr_t **sectors, + int warn_short); #endif }; typedef struct grub_partition_map *grub_partition_map_t; diff --git a/include/grub/util/install.h b/include/grub/util/install.h index f56058111..1541ee233 100644 --- a/include/grub/util/install.h +++ b/include/grub/util/install.h @@ -194,13 +194,13 @@ grub_util_bios_setup (const char *dir, const char *boot_file, const char *core_file, const char *dest, int force, int fs_probe, int allow_floppy, - int add_rs_codes); + int add_rs_codes, int warn_short_mbr_gap); void grub_util_sparc_setup (const char *dir, const char *boot_file, const char *core_file, const char *dest, int force, int fs_probe, int allow_floppy, - int add_rs_codes); + int add_rs_codes, int warn_short_mbr_gap); char * grub_install_get_image_targets_string (void); @@ -269,6 +269,9 @@ grub_util_get_target_name (const struct grub_install_image_target_desc *t); extern char *grub_install_copy_buffer; #define GRUB_INSTALL_COPY_BUFFER_SIZE 1048576 +int +grub_install_is_short_mbrgap_supported(void); + int grub_install_sync_fs_journal (const char *path); #endif diff --git a/util/grub-install-common.c b/util/grub-install-common.c index 9cc217d70..4c04b1bce 100644 --- a/util/grub-install-common.c +++ b/util/grub-install-common.c @@ -234,6 +234,31 @@ char *grub_install_source_directory = NULL; char *grub_install_locale_directory = NULL; char *grub_install_themes_directory = NULL; +int +grub_install_is_short_mbrgap_supported() +{ + int i, j; + static const char *whitelist[] = + { + "part_msdos", "biosdisk", "affs", "afs", "bfs", "archelp", + "cpio", "cpio_be", "newc", "odc", "ext2", "fat", "exfat", + "f2fs", "fshelp", "hfs", "hfsplus", "hfspluscomp", + "iso9660", "jfs", "minix", "minix2", "minix3", "minix_be", + "minix2_be", "minix2_be", "nilfs2", "ntfs", "ntfscomp", + "reiserfs", "romfs", "sfs", "squash4", "tar", "udf", + "ufs1", "ufs1_be", "ufs2", "xfs" + }; + for (i = 0; i < modules.n_entries; i++) + { + for (j = 0; j < ARRAY_SIZE (whitelist); j++) + if (strcmp(modules.entries[i], whitelist[j]) == 0) + break; + if (j == ARRAY_SIZE (whitelist)) + return 0; + } + return 1; +} + void grub_install_push_module (const char *val) { diff --git a/util/grub-install.c b/util/grub-install.c index 8d18f2530..ac8f98552 100644 --- a/util/grub-install.c +++ b/util/grub-install.c @@ -1956,9 +1956,14 @@ main (int argc, char *argv[]) /* Now perform the installation. */ if (install_bootsector) - grub_util_bios_setup (platdir, "boot.img", "core.img", - install_drive, force, - fs_probe, allow_floppy, add_rs_codes); + { + int warn_short_mbr_gap = !grub_install_is_short_mbrgap_supported(); + + grub_util_bios_setup (platdir, "boot.img", "core.img", + install_drive, force, + fs_probe, allow_floppy, add_rs_codes, + warn_short_mbr_gap); + } break; } case GRUB_INSTALL_PLATFORM_SPARC64_IEEE1275: @@ -1985,7 +1990,7 @@ main (int argc, char *argv[]) grub_util_sparc_setup (platdir, "boot.img", "core.img", install_drive, force, fs_probe, allow_floppy, - 0 /* unused */ ); + 0 /* unused */, 0 /* unused */ ); break; } diff --git a/util/grub-setup.c b/util/grub-setup.c index 42b98ad3c..1783224dd 100644 --- a/util/grub-setup.c +++ b/util/grub-setup.c @@ -315,7 +315,7 @@ main (int argc, char *argv[]) arguments.core_file ? : DEFAULT_CORE_FILE, dest_dev, arguments.force, arguments.fs_probe, arguments.allow_floppy, - arguments.add_rs_codes); + arguments.add_rs_codes, 0); /* Free resources. */ grub_fini_all (); diff --git a/util/setup.c b/util/setup.c index 59b2b4b85..f34dcb0fe 100644 --- a/util/setup.c +++ b/util/setup.c @@ -254,7 +254,8 @@ SETUP (const char *dir, const char *boot_file, const char *core_file, const char *dest, int force, int fs_probe, int allow_floppy, - int add_rs_codes __attribute__ ((unused))) /* unused on sparc64 */ + int add_rs_codes __attribute__ ((unused)), /* unused on sparc64 */ + int warn_small) { char *core_path; char *boot_img, *core_img, *boot_path; @@ -528,7 +529,7 @@ SETUP (const char *dir, else if (ctx.dest_partmap) { err = ctx.dest_partmap->embed (dest_dev->disk, &nsec, maxsec, - GRUB_EMBED_PCBIOS, §ors); + GRUB_EMBED_PCBIOS, §ors, warn_small); #ifdef GRUB_SETUP_BIOS if ((err == GRUB_ERR_OUT_OF_RANGE || err == GRUB_ERR_FILE_NOT_FOUND) && dest_dev->disk->id == root_dev->disk->id -- 2.26.2
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