b141171629
- Remove -fcf-protection compiler flag to allow i386 builds (law) Related: rhbz#1915452 - Unify GRUB configuration file location across all platforms Related: rhbz#1918817 - Add 'at_keyboard_fallback_set' var to force the set manually (rmetrich) - Add appended signatures support for ppc64le LPAR Secure Boot (daxtens) Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
98 lines
2.8 KiB
Diff
98 lines
2.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Axtens <dja@axtens.net>
|
|
Date: Wed, 29 Jul 2020 17:46:16 +1000
|
|
Subject: [PATCH] verifiers: provide unsafe module list
|
|
|
|
Other verifiers that implement secure boot may want to be able to
|
|
use this list and behaviour.
|
|
|
|
Upstream, this factors the list out of the shim_lock verifier.
|
|
However, that hasn't hit the RHEL8.4 tree yet, so instead
|
|
of factoring it out of that we just create it.
|
|
|
|
Signed-off-by: Daniel Axtens <dja@axtens.net>
|
|
---
|
|
grub-core/commands/verifiers.c | 46 ++++++++++++++++++++++++++++++++++++++++++
|
|
include/grub/verify.h | 13 ++++++++++++
|
|
2 files changed, 59 insertions(+)
|
|
|
|
diff --git a/grub-core/commands/verifiers.c b/grub-core/commands/verifiers.c
|
|
index 7b9297cd345..4ced984cfed 100644
|
|
--- a/grub-core/commands/verifiers.c
|
|
+++ b/grub-core/commands/verifiers.c
|
|
@@ -218,6 +218,52 @@ grub_verify_string (char *str, enum grub_verify_string_type type)
|
|
return GRUB_ERR_NONE;
|
|
}
|
|
|
|
+/* List of modules which may allow for verifcation to be bypassed. */
|
|
+static const char *const disabled_mods[] = { "iorw", "memrw", "wrmsr", NULL };
|
|
+
|
|
+/*
|
|
+ * Does the module in file `io' allow for the a verifier to be bypassed?
|
|
+ *
|
|
+ * Returns 1 if so, otherwise 0.
|
|
+ */
|
|
+char
|
|
+grub_is_dangerous_module (grub_file_t io)
|
|
+{
|
|
+ char *b, *e;
|
|
+ int i;
|
|
+
|
|
+ /* Establish GRUB module name. */
|
|
+ b = grub_strrchr (io->name, '/');
|
|
+ e = grub_strrchr (io->name, '.');
|
|
+
|
|
+ b = b ? (b + 1) : io->name;
|
|
+ e = e ? e : io->name + grub_strlen (io->name);
|
|
+ e = (e > b) ? e : io->name + grub_strlen (io->name);
|
|
+
|
|
+ for (i = 0; disabled_mods[i]; i++)
|
|
+ if (!grub_strncmp (b, disabled_mods[i],
|
|
+ grub_strlen (b) - grub_strlen (e)))
|
|
+ return 1;
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/*
|
|
+ * Is there already an unsafe module in memory?
|
|
+ * Returns the name if one is loaded, otherwise NULL.
|
|
+ */
|
|
+const char *
|
|
+grub_dangerous_module_loaded (void)
|
|
+{
|
|
+ int i;
|
|
+
|
|
+ for (i = 0; disabled_mods[i]; i++)
|
|
+ if (grub_dl_get (disabled_mods[i]))
|
|
+ {
|
|
+ return disabled_mods[i];
|
|
+ }
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
GRUB_MOD_INIT(verifiers)
|
|
{
|
|
grub_file_filter_register (GRUB_FILE_FILTER_VERIFY, grub_verifiers_open);
|
|
diff --git a/include/grub/verify.h b/include/grub/verify.h
|
|
index ea049143368..8c2de132051 100644
|
|
--- a/include/grub/verify.h
|
|
+++ b/include/grub/verify.h
|
|
@@ -81,4 +81,17 @@ grub_verifier_unregister (struct grub_file_verifier *ver)
|
|
grub_err_t
|
|
grub_verify_string (char *str, enum grub_verify_string_type type);
|
|
|
|
+/*
|
|
+ * Does the module in file `io' allow for the a verifier to be bypassed?
|
|
+ *
|
|
+ * Returns 1 if so, otherwise 0.
|
|
+ */
|
|
+char grub_is_dangerous_module (grub_file_t io);
|
|
+
|
|
+/*
|
|
+ * Is there already an unsafe module in memory?
|
|
+ * Returns the name if one is loaded, otherwise NULL.
|
|
+ */
|
|
+const char *grub_dangerous_module_loaded (void);
|
|
+
|
|
#endif /* ! GRUB_VERIFY_HEADER */
|