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grub-core/commands: add flag to only search root dev

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Resolves: #2223437
Resolves: #2224951
Resolves: #2258096
Resolves: CVE-2023-4001
Signed-off-by: Nicolas Frayer <nfrayer@redhat.com>
This commit is contained in:
Nicolas Frayer 2023-10-25 16:57:09 +02:00
parent 4afdc36e08
commit 111a2e2ad7
3 changed files with 170 additions and 2 deletions
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160
0348-add-flag-to-only-search-root-dev.patch Normal file
View file

@ -0,0 +1,160 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Marta Lewandowska <mlewando@redhat.com>
Date: Mon, 9 Oct 2023 08:53:18 +0200
Subject: [PATCH] add flag to only search root dev
fixes bz#2223437
Signed-off-by: Marta Lewandowska <mlewando@redhat.com>
---
grub-core/commands/search.c | 36 ++++++++++++++++++++++++++++++++++++
grub-core/commands/search_wrap.c | 5 +++++
grub-core/kern/misc.c | 30 ++++++++++++++++++++++++++++++
include/grub/misc.h | 1 +
include/grub/search.h | 3 ++-
5 files changed, 74 insertions(+), 1 deletion(-)
diff --git a/grub-core/commands/search.c b/grub-core/commands/search.c
index 57d26ced8a8e..819231751c38 100644
--- a/grub-core/commands/search.c
+++ b/grub-core/commands/search.c
@@ -85,6 +85,42 @@ iterate_device (const char *name, void *data)
grub_device_close (dev);
}
+ /* Skip it if it's not the root device when requested. */
+ if (ctx->flags & SEARCH_FLAGS_ROOTDEV_ONLY)
+ {
+ const char *root_dev;
+ root_dev = grub_env_get ("root");
+ if (root_dev != NULL && *root_dev != '\0')
+ {
+ char *root_disk = grub_malloc (grub_strlen(root_dev) + 1);
+ char *name_disk = grub_malloc (grub_strlen(name) + 1);
+ char *rem_1 = grub_malloc(grub_strlen(root_dev) + 1);
+ char *rem_2 = grub_malloc(grub_strlen(name) + 1);
+
+ if (root_disk != NULL && name_disk != NULL &&
+ rem_1 != NULL && rem_2 != NULL)
+ {
+ /* get just the disk name; partitions will be different. */
+ grub_str_sep (root_dev, root_disk, ',', rem_1);
+ grub_str_sep (name, name_disk, ',', rem_2);
+ if (root_disk != NULL && *root_disk != '\0' &&
+ name_disk != NULL && *name_disk != '\0')
+ if (grub_strcmp(root_disk, name_disk) != 0)
+ {
+ grub_free (root_disk);
+ grub_free (name_disk);
+ grub_free (rem_1);
+ grub_free (rem_2);
+ return 0;
+ }
+ }
+ grub_free (root_disk);
+ grub_free (name_disk);
+ grub_free (rem_1);
+ grub_free (rem_2);
+ }
+ }
+
#ifdef DO_SEARCH_FS_UUID
#define compare_fn grub_strcasecmp
#else
diff --git a/grub-core/commands/search_wrap.c b/grub-core/commands/search_wrap.c
index 0b62acf85359..06b5f51eefb5 100644
--- a/grub-core/commands/search_wrap.c
+++ b/grub-core/commands/search_wrap.c
@@ -41,6 +41,7 @@ static const struct grub_arg_option options[] =
ARG_TYPE_STRING},
{"no-floppy", 'n', 0, N_("Do not probe any floppy drive."), 0, 0},
{"efidisk-only", 0, 0, N_("Only probe EFI disks."), 0, 0},
+ {"root-dev-only", 'r', 0, N_("Only probe root device."), 0, 0},
{"hint", 'h', GRUB_ARG_OPTION_REPEATABLE,
N_("First try the device HINT. If HINT ends in comma, "
"also try subpartitions"), N_("HINT"), ARG_TYPE_STRING},
@@ -75,6 +76,7 @@ enum options
SEARCH_SET,
SEARCH_NO_FLOPPY,
SEARCH_EFIDISK_ONLY,
+ SEARCH_ROOTDEV_ONLY,
SEARCH_HINT,
SEARCH_HINT_IEEE1275,
SEARCH_HINT_BIOS,
@@ -189,6 +191,9 @@ grub_cmd_search (grub_extcmd_context_t ctxt, int argc, char **args)
if (state[SEARCH_EFIDISK_ONLY].set)
flags |= SEARCH_FLAGS_EFIDISK_ONLY;
+ if (state[SEARCH_ROOTDEV_ONLY].set)
+ flags |= SEARCH_FLAGS_ROOTDEV_ONLY;
+
if (state[SEARCH_LABEL].set)
grub_search_label (id, var, flags, hints, nhints);
else if (state[SEARCH_FS_UUID].set)
diff --git a/grub-core/kern/misc.c b/grub-core/kern/misc.c
index cb454614022f..c0ac7fee6cc2 100644
--- a/grub-core/kern/misc.c
+++ b/grub-core/kern/misc.c
@@ -619,6 +619,36 @@ grub_reverse (char *str)
}
}
+/* Separate string into two parts, broken up by delimiter delim. */
+void
+grub_str_sep (const char *s, char *p, char delim, char *r)
+{
+ char* t = grub_strndup(s, grub_strlen(s));
+
+ if (t != NULL && *t != '\0')
+ {
+ char* tmp = t;
+
+ while (((*p = *t) != '\0') && ((*p = *t) != delim))
+ {
+ p++;
+ t++;
+ }
+ *p = '\0';
+
+ if (*t != '\0')
+ {
+ t++;
+ while ((*r++ = *t++) != '\0')
+ ;
+ *r = '\0';
+ }
+ grub_free (tmp);
+ }
+ else
+ grub_free (t);
+}
+
/* Divide N by D, return the quotient, and store the remainder in *R. */
grub_uint64_t
grub_divmod64 (grub_uint64_t n, grub_uint64_t d, grub_uint64_t *r)
diff --git a/include/grub/misc.h b/include/grub/misc.h
index faae0ae8606c..981526644d29 100644
--- a/include/grub/misc.h
+++ b/include/grub/misc.h
@@ -314,6 +314,7 @@ void *EXPORT_FUNC(grub_memset) (void *s, int c, grub_size_t n);
grub_size_t EXPORT_FUNC(grub_strlen) (const char *s) WARN_UNUSED_RESULT;
int EXPORT_FUNC(grub_printf) (const char *fmt, ...) __attribute__ ((format (GNU_PRINTF, 1, 2)));
int EXPORT_FUNC(grub_printf_) (const char *fmt, ...) __attribute__ ((format (GNU_PRINTF, 1, 2)));
+void EXPORT_FUNC(grub_str_sep) (const char *s, char *p, char delim, char *r);
/* Replace all `ch' characters of `input' with `with' and copy the
result into `output'; return EOS address of `output'. */
diff --git a/include/grub/search.h b/include/grub/search.h
index 4190aeb2cbf5..321d1400e451 100644
--- a/include/grub/search.h
+++ b/include/grub/search.h
@@ -22,7 +22,8 @@
enum search_flags
{
SEARCH_FLAGS_NO_FLOPPY = 1,
- SEARCH_FLAGS_EFIDISK_ONLY = 2
+ SEARCH_FLAGS_EFIDISK_ONLY = 2,
+ SEARCH_FLAGS_ROOTDEV_ONLY = 4
};
void grub_search_fs_file (const char *key, const char *var,

1
grub.patches
View file

@ -345,3 +345,4 @@ Patch0344: 0344-fs-xfs-Incorrect-short-form-directory-data-boundary-.patch
Patch0345: 0345-fs-xfs-Add-large-extent-counters-incompat-feature-su.patch Patch0345: 0345-fs-xfs-Add-large-extent-counters-incompat-feature-su.patch
Patch0346: 0346-chainloader-remove-device-path-debug-message.patch Patch0346: 0346-chainloader-remove-device-path-debug-message.patch
Patch0347: 0347-normal-Remove-grub_env_set-prefix-in-grub_try_normal.patch Patch0347: 0347-normal-Remove-grub_env_set-prefix-in-grub_try_normal.patch
Patch0348: 0348-add-flag-to-only-search-root-dev.patch

11
grub2.spec
View file

@ -17,7 +17,7 @@
Name: grub2 Name: grub2
Epoch: 1 Epoch: 1
Version: 2.06 Version: 2.06
Release: 115%{?dist} Release: 116%{?dist}
Summary: Bootloader with support for Linux, Multiboot and more Summary: Bootloader with support for Linux, Multiboot and more
License: GPLv3+ License: GPLv3+
URL: http://www.gnu.org/software/grub/ URL: http://www.gnu.org/software/grub/
@ -368,7 +368,7 @@ BOOT_UUID=$(grub2-probe --target=fs_uuid ${GRUB_HOME})
GRUB_DIR=$(grub2-mkrelpath ${GRUB_HOME}) GRUB_DIR=$(grub2-mkrelpath ${GRUB_HOME})
cat << EOF > ${EFI_HOME}/grub.cfg.stb cat << EOF > ${EFI_HOME}/grub.cfg.stb
search --no-floppy --fs-uuid --set=dev ${BOOT_UUID} search --no-floppy --root-dev-only --fs-uuid --set=dev ${BOOT_UUID}
set prefix=(\$dev)${GRUB_DIR} set prefix=(\$dev)${GRUB_DIR}
export \$prefix export \$prefix
configfile \$prefix/grub.cfg configfile \$prefix/grub.cfg
@ -554,6 +554,13 @@ mv ${EFI_HOME}/grub.cfg.stb ${EFI_HOME}/grub.cfg
%endif %endif
%changelog %changelog
* Mon Jan 15 2024 Nicolas Frayer <nfrayer@redhat.com> - 2.06-116
- grub-core/commands: add flag to only search root dev
- Resolves: #2223437
- Resolves: #2224951
- Resolves: #2258096
- Resolves: CVE-2023-4001
* Sat Jan 13 2024 Hector Martin <marcan@fedoraproject.org> - 2.06-115 * Sat Jan 13 2024 Hector Martin <marcan@fedoraproject.org> - 2.06-115
- Switch memdisk compression to lzop - Switch memdisk compression to lzop