183 lines
5.0 KiB
Diff
183 lines
5.0 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Nicolas Frayer <nfrayer@redhat.com>
|
|
Date: Thu, 16 May 2024 10:58:32 +0200
|
|
Subject: [PATCH] cmd/search: Rework of CVE-2023-4001 fix
|
|
|
|
The initial fix implemented a new flag that forces the grub cfg
|
|
stub to be located on the same disk as grub. This created several
|
|
issues such as RAID machines not being able to boot as their
|
|
partition names under grub were different from the partition where
|
|
grub is located. It also simply means that any machines with the
|
|
/boot partition located on a disk other than the one containing grub
|
|
won't boot.
|
|
This commit denies booting if the grub cfg stub is located on a USB
|
|
drive with a duplicated UUID (UUID being the same as the partition
|
|
containing the actual grub cfg stub)
|
|
|
|
Signed-off-by: Nicolas Frayer <nfrayer@redhat.com>
|
|
---
|
|
grub-core/commands/search.c | 136 +++++++++++++++++++++++++++++++++++++++++---
|
|
1 file changed, 127 insertions(+), 9 deletions(-)
|
|
|
|
diff --git a/grub-core/commands/search.c b/grub-core/commands/search.c
|
|
index 819231751c38..1e61a5cf940f 100644
|
|
--- a/grub-core/commands/search.c
|
|
+++ b/grub-core/commands/search.c
|
|
@@ -30,6 +30,8 @@
|
|
#include <grub/i18n.h>
|
|
#include <grub/disk.h>
|
|
#include <grub/partition.h>
|
|
+#include <grub/efi/api.h>
|
|
+#include <grub/time.h>
|
|
|
|
GRUB_MOD_LICENSE ("GPLv3+");
|
|
|
|
@@ -54,6 +56,100 @@ struct search_ctx
|
|
int is_cache;
|
|
};
|
|
|
|
+static int
|
|
+is_device_usb (const char *name)
|
|
+{
|
|
+ int ret = 0;
|
|
+
|
|
+ grub_device_t dev = grub_device_open(name);
|
|
+
|
|
+ if (dev)
|
|
+ {
|
|
+ struct grub_efidisk_data
|
|
+ {
|
|
+ grub_efi_handle_t handle;
|
|
+ grub_efi_device_path_t *device_path;
|
|
+ grub_efi_device_path_t *last_device_path;
|
|
+ grub_efi_block_io_t *block_io;
|
|
+ struct grub_efidisk_data *next;
|
|
+ };
|
|
+
|
|
+ if (dev->disk && dev->disk->data)
|
|
+ {
|
|
+ struct grub_efidisk_data *dp = dev->disk->data;
|
|
+
|
|
+ if ( GRUB_EFI_DEVICE_PATH_TYPE (dp->last_device_path) == GRUB_EFI_MESSAGING_DEVICE_PATH_TYPE &&
|
|
+ GRUB_EFI_DEVICE_PATH_SUBTYPE (dp->last_device_path) == GRUB_EFI_USB_DEVICE_PATH_SUBTYPE)
|
|
+ {
|
|
+ ret = 1;
|
|
+ }
|
|
+ }
|
|
+ grub_device_close(dev);
|
|
+ }
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int
|
|
+get_device_uuid(const char *name, char** quid)
|
|
+{
|
|
+ int ret = 0;
|
|
+
|
|
+ grub_device_t dev_part = grub_device_open(name);
|
|
+
|
|
+ if (dev_part)
|
|
+ {
|
|
+ grub_fs_t fs;
|
|
+
|
|
+ fs = grub_fs_probe (dev_part);
|
|
+
|
|
+#ifdef DO_SEARCH_FS_UUID
|
|
+#define read_fn fs_uuid
|
|
+#else
|
|
+#define read_fn fs_label
|
|
+#endif
|
|
+ if (fs && fs->read_fn)
|
|
+ {
|
|
+ fs->read_fn (dev_part, quid);
|
|
+
|
|
+ if (grub_errno == GRUB_ERR_NONE && *quid)
|
|
+ {
|
|
+ ret = 1;
|
|
+ }
|
|
+
|
|
+ }
|
|
+ grub_device_close (dev_part);
|
|
+ }
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+struct uuid_context {
|
|
+ char* name;
|
|
+ char* uuid;
|
|
+};
|
|
+
|
|
+static int
|
|
+check_for_duplicate (const char *name, void *data)
|
|
+{
|
|
+ int ret = 0;
|
|
+ struct uuid_context * uuid_ctx = (struct uuid_context *)data;
|
|
+ char *quid = 0;
|
|
+
|
|
+ get_device_uuid(name, &quid);
|
|
+
|
|
+ if (quid == NULL)
|
|
+ return 0;
|
|
+
|
|
+ if (!grub_strcasecmp(quid, uuid_ctx->uuid) && grub_strcasecmp(name, uuid_ctx->name))
|
|
+ {
|
|
+ ret = 1;
|
|
+ }
|
|
+
|
|
+ grub_free(quid);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
/* Helper for FUNC_NAME. */
|
|
static int
|
|
iterate_device (const char *name, void *data)
|
|
@@ -104,15 +200,37 @@ iterate_device (const char *name, void *data)
|
|
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;
|
|
- }
|
|
+ name_disk != NULL && *name_disk != '\0')
|
|
+ {
|
|
+ grub_device_t dev, dev_part;
|
|
+
|
|
+ if (is_device_usb(name) && !is_device_usb(root_dev))
|
|
+ {
|
|
+ char *quid_name = NULL;
|
|
+ int longlist = 0;
|
|
+ struct uuid_context uuid_ctx;
|
|
+ int ret = 0;
|
|
+
|
|
+ get_device_uuid(name, &quid_name);
|
|
+ if (!grub_strcmp(quid_name, ctx->key))
|
|
+ {
|
|
+ uuid_ctx.name = name;
|
|
+ uuid_ctx.uuid = quid_name;
|
|
+
|
|
+ ret = grub_device_iterate (check_for_duplicate, &uuid_ctx);
|
|
+
|
|
+ if (ret)
|
|
+ {
|
|
+ grub_printf("Duplicated media UUID found, rebooting ...\n");
|
|
+ grub_sleep(10);
|
|
+ grub_reboot();
|
|
+ }
|
|
+ }
|
|
+
|
|
+ if (quid_name) grub_free (quid_name);
|
|
+
|
|
+ }
|
|
+ }
|
|
}
|
|
grub_free (root_disk);
|
|
grub_free (name_disk);
|