3ba6ddf1b2
* 0001-10_linux-Do-not-enable-BLSCFG-on-s390-emu.patch - Fix xen package contains debug_info files with the .module suffix by moving them to a separate xen-debug subpackage (bsc#1232573) OBS-URL: https://build.opensuse.org/package/show/Base:System/grub2?expand=0&rev=520
39 lines
1.3 KiB
Diff
39 lines
1.3 KiB
Diff
From 370e435b6ada53314888f04dcd8f096fc11cfadb Mon Sep 17 00:00:00 2001
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From: Gary Lin <glin@suse.com>
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Date: Thu, 3 Aug 2023 15:52:52 +0800
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Subject: [PATCH 3/4] cryptodisk: wipe out the cached keys from protectors
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An attacker may insert a malicious disk with the same crypto UUID and
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trick grub2 to mount the fake root. Even though the key from the key
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protector fails to unlock the fake root, it's not wiped out cleanly so
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the attacker could dump the memory to retrieve the secret key. To defend
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such attack, wipe out the cached key when we don't need it.
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Cc: Fabian Vogt <fvogt@suse.com>
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Signed-off-by: Gary Lin <glin@suse.com>
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Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
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---
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grub-core/disk/cryptodisk.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/grub-core/disk/cryptodisk.c b/grub-core/disk/cryptodisk.c
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index f9842f776..aa0d43562 100644
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--- a/grub-core/disk/cryptodisk.c
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+++ b/grub-core/disk/cryptodisk.c
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@@ -1355,7 +1355,11 @@ grub_cryptodisk_clear_key_cache (struct grub_cryptomount_args *cargs)
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return;
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for (i = 0; cargs->protectors[i]; i++)
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- grub_free (cargs->key_cache[i].key);
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+ {
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+ if (cargs->key_cache[i].key)
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+ grub_memset (cargs->key_cache[i].key, 0, cargs->key_cache[i].key_len);
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+ grub_free (cargs->key_cache[i].key);
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+ }
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grub_free (cargs->key_cache);
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}
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--
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2.35.3
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