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@ -0,0 +1,159 @@
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Marta Lewandowska <mlewando@redhat.com>
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Date: Mon, 9 Oct 2023 08:53:18 +0200
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Subject: [PATCH] search command: add flag to only search root dev
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bz#2223437
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Signed-off-by: Marta Lewandowska <mlewando@redhat.com>
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---
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grub-core/commands/search.c | 36 ++++++++++++++++++++++++++++++++++++
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grub-core/commands/search_wrap.c | 5 +++++
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grub-core/kern/misc.c | 30 ++++++++++++++++++++++++++++++
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include/grub/misc.h | 1 +
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include/grub/search.h | 3 ++-
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5 files changed, 74 insertions(+), 1 deletion(-)
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diff --git a/grub-core/commands/search.c b/grub-core/commands/search.c
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index 57d26ced8a8e..94fe8b2872a1 100644
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--- a/grub-core/commands/search.c
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+++ b/grub-core/commands/search.c
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@@ -85,6 +85,42 @@ iterate_device (const char *name, void *data)
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grub_device_close (dev);
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}
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+ /* Skip it if it's not the root device when requested. */
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+ if (ctx->flags & SEARCH_FLAGS_ROOTDEV_ONLY)
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+ {
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+ const char *root_dev;
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+ root_dev = grub_env_get ("root");
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+ if (root_dev != NULL && *root_dev != '\0')
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+ {
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+ char *root_disk = grub_malloc (grub_strlen(root_dev) + 1);
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+ char *name_disk = grub_malloc (grub_strlen(name) + 1);
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+ char *rem_1 = grub_malloc(grub_strlen(root_dev) + 1);
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+ char *rem_2 = grub_malloc(grub_strlen(name) + 1);
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+
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+ if (root_disk != NULL && name_disk != NULL &&
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+ rem_1 != NULL && rem_2 != NULL)
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+ {
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+ /* get just the disk name; partitions will be different. */
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+ grub_str_sep (root_dev, root_disk, ',', rem_1);
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+ grub_str_sep (name, name_disk, ',', rem_2);
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+ if (root_disk != NULL && *root_disk != '\0' &&
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+ name_disk != NULL && *name_disk != '\0')
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+ if (grub_strcmp(root_disk, name_disk) != 0)
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+ {
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+ grub_free (root_disk);
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+ grub_free (name_disk);
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+ grub_free (rem_1);
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+ grub_free (rem_2);
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+ return 0;
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+ }
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+ }
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+ grub_free (root_disk);
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+ grub_free (name_disk);
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+ grub_free (rem_1);
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+ grub_free (rem_2);
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+ }
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+ }
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+
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#ifdef DO_SEARCH_FS_UUID
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#define compare_fn grub_strcasecmp
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#else
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diff --git a/grub-core/commands/search_wrap.c b/grub-core/commands/search_wrap.c
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index 0b62acf85359..06b5f51eefb5 100644
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--- a/grub-core/commands/search_wrap.c
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+++ b/grub-core/commands/search_wrap.c
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@@ -41,6 +41,7 @@ static const struct grub_arg_option options[] =
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ARG_TYPE_STRING},
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{"no-floppy", 'n', 0, N_("Do not probe any floppy drive."), 0, 0},
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{"efidisk-only", 0, 0, N_("Only probe EFI disks."), 0, 0},
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+ {"root-dev-only", 'r', 0, N_("Only probe root device."), 0, 0},
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{"hint", 'h', GRUB_ARG_OPTION_REPEATABLE,
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N_("First try the device HINT. If HINT ends in comma, "
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"also try subpartitions"), N_("HINT"), ARG_TYPE_STRING},
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@@ -75,6 +76,7 @@ enum options
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SEARCH_SET,
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SEARCH_NO_FLOPPY,
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SEARCH_EFIDISK_ONLY,
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+ SEARCH_ROOTDEV_ONLY,
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SEARCH_HINT,
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SEARCH_HINT_IEEE1275,
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SEARCH_HINT_BIOS,
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@@ -189,6 +191,9 @@ grub_cmd_search (grub_extcmd_context_t ctxt, int argc, char **args)
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if (state[SEARCH_EFIDISK_ONLY].set)
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flags |= SEARCH_FLAGS_EFIDISK_ONLY;
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+ if (state[SEARCH_ROOTDEV_ONLY].set)
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+ flags |= SEARCH_FLAGS_ROOTDEV_ONLY;
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+
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if (state[SEARCH_LABEL].set)
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grub_search_label (id, var, flags, hints, nhints);
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else if (state[SEARCH_FS_UUID].set)
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diff --git a/grub-core/kern/misc.c b/grub-core/kern/misc.c
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index cb454614022f..50af9ee1bdd9 100644
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--- a/grub-core/kern/misc.c
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+++ b/grub-core/kern/misc.c
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@@ -619,6 +619,36 @@ grub_reverse (char *str)
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}
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}
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+/* Separate string into two parts, broken up by delimiter delim. */
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+void
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+grub_str_sep (const char *s, char *p, char delim, char *r)
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+{
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+ char* t = grub_strndup(s, grub_strlen(s));
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+
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+ if (t != NULL && *t != '\0')
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+ {
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+ char* tmp = t;
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+
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+ while (((*p = *t) != '\0') && ((*p = *t) != delim))
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+ {
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+ p++;
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+ t++;
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+ }
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+ *p = '\0';
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+
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+ if (*t != '\0')
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+ {
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+ t++;
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+ while ((*r++ = *t++) != '\0')
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+ ;
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+ *r = '\0';
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+ }
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+ grub_free (tmp);
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+ }
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+ else
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+ grub_free (t);
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+}
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+
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/* Divide N by D, return the quotient, and store the remainder in *R. */
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grub_uint64_t
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grub_divmod64 (grub_uint64_t n, grub_uint64_t d, grub_uint64_t *r)
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diff --git a/include/grub/misc.h b/include/grub/misc.h
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index faae0ae8606c..981526644d29 100644
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--- a/include/grub/misc.h
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+++ b/include/grub/misc.h
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@@ -314,6 +314,7 @@ void *EXPORT_FUNC(grub_memset) (void *s, int c, grub_size_t n);
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grub_size_t EXPORT_FUNC(grub_strlen) (const char *s) WARN_UNUSED_RESULT;
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int EXPORT_FUNC(grub_printf) (const char *fmt, ...) __attribute__ ((format (GNU_PRINTF, 1, 2)));
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int EXPORT_FUNC(grub_printf_) (const char *fmt, ...) __attribute__ ((format (GNU_PRINTF, 1, 2)));
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+void EXPORT_FUNC(grub_str_sep) (const char *s, char *p, char delim, char *r);
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/* Replace all `ch' characters of `input' with `with' and copy the
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result into `output'; return EOS address of `output'. */
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diff --git a/include/grub/search.h b/include/grub/search.h
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index 4190aeb2cbf5..321d1400e451 100644
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--- a/include/grub/search.h
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+++ b/include/grub/search.h
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@@ -22,7 +22,8 @@
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enum search_flags
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{
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SEARCH_FLAGS_NO_FLOPPY = 1,
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- SEARCH_FLAGS_EFIDISK_ONLY = 2
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+ SEARCH_FLAGS_EFIDISK_ONLY = 2,
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+ SEARCH_FLAGS_ROOTDEV_ONLY = 4
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};
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void grub_search_fs_file (const char *key, const char *var,
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@ -1,3 +1,4 @@
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sbat,1,SBAT Version,sbat,1,https://github.com/rhboot/shim/blob/main/SBAT.md
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grub,3,Free Software Foundation,grub,@@VERSION@@,https//www.gnu.org/software/grub/
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grub.rh,2,Red Hat,grub2,@@VERSION_RELEASE@@,mailto:secalert@redhat.com
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grub.rh,2,Red Hat,grub2,@@RHEL_VERSION_RELEASE@@,mailto:secalert@redhat.com
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grub.msvsphere,2,MSVSphere,grub2,@@VERSION_RELEASE@@,mailto:security@msvsphere-os.ru
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