38 lines
1.3 KiB
Diff
38 lines
1.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: B Horn <b@horn.uk>
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Date: Fri, 19 Apr 2024 22:31:45 +0100
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Subject: [PATCH] commands/hexdump: Disable memory reading in lockdown mode
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Reported-by: B Horn <b@horn.uk>
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Signed-off-by: B Horn <b@horn.uk>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/commands/hexdump.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/grub-core/commands/hexdump.c b/grub-core/commands/hexdump.c
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index eaa12465b..d6f61d98a 100644
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--- a/grub-core/commands/hexdump.c
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+++ b/grub-core/commands/hexdump.c
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@@ -24,6 +24,7 @@
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#include <grub/lib/hexdump.h>
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#include <grub/extcmd.h>
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#include <grub/i18n.h>
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+#include <grub/lockdown.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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@@ -51,7 +52,11 @@ grub_cmd_hexdump (grub_extcmd_context_t ctxt, int argc, char **args)
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length = (state[1].set) ? grub_strtoul (state[1].arg, 0, 0) : 256;
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if (!grub_strcmp (args[0], "(mem)"))
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- hexdump (skip, (char *) (grub_addr_t) skip, length);
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+ {
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+ if (grub_is_lockdown() == GRUB_LOCKDOWN_ENABLED)
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+ return grub_error (GRUB_ERR_ACCESS_DENIED, N_("memory reading is disabled in lockdown mode"));
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+ hexdump (skip, (char *) (grub_addr_t) skip, length);
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+ }
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else if ((args[0][0] == '(') && (args[0][namelen - 1] == ')'))
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{
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grub_disk_t disk;
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