|
 |
b1bcb2 |
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
|
c4e390 |
From: Colin Watson <cjwatson@debian.org>
|
|
|
c4e390 |
Date: Fri, 24 Jul 2020 17:18:09 +0100
|
|
|
b1bcb2 |
Subject: [PATCH] efilinux: Fix integer overflows in grub_cmd_initrd
|
|
|
c4e390 |
|
|
|
c4e390 |
These could be triggered by an extremely large number of arguments to
|
|
|
c4e390 |
the initrd command on 32-bit architectures, or a crafted filesystem with
|
|
|
c4e390 |
very large files on any architecture.
|
|
|
c4e390 |
|
|
|
c4e390 |
Signed-off-by: Colin Watson <cjwatson@debian.org>
|
|
|
c4e390 |
---
|
|
|
c4e390 |
grub-core/loader/i386/efi/linux.c | 9 +++++++--
|
|
|
c4e390 |
1 file changed, 7 insertions(+), 2 deletions(-)
|
|
|
c4e390 |
|
|
|
c4e390 |
diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c
|
|
|
c4e390 |
index 7166ec17f8f..95dbb9e20af 100644
|
|
|
c4e390 |
--- a/grub-core/loader/i386/efi/linux.c
|
|
|
c4e390 |
+++ b/grub-core/loader/i386/efi/linux.c
|
|
|
c4e390 |
@@ -27,6 +27,7 @@
|
|
|
c4e390 |
#include <grub/lib/cmdline.h>
|
|
|
c4e390 |
#include <grub/efi/efi.h>
|
|
|
c4e390 |
#include <grub/efi/linux.h>
|
|
|
c4e390 |
+#include <grub/safemath.h>
|
|
|
c4e390 |
|
|
|
c4e390 |
GRUB_MOD_LICENSE ("GPLv3+");
|
|
|
c4e390 |
|
|
|
c4e390 |
@@ -93,7 +94,7 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
|
|
|
c4e390 |
goto fail;
|
|
|
c4e390 |
}
|
|
|
c4e390 |
|
|
|
c4e390 |
- files = grub_zalloc (argc * sizeof (files[0]));
|
|
|
c4e390 |
+ files = grub_calloc (argc, sizeof (files[0]));
|
|
|
c4e390 |
if (!files)
|
|
|
c4e390 |
goto fail;
|
|
|
c4e390 |
|
|
|
c4e390 |
@@ -104,7 +105,11 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
|
|
|
c4e390 |
if (! files[i])
|
|
|
c4e390 |
goto fail;
|
|
|
c4e390 |
nfiles++;
|
|
|
c4e390 |
- size += ALIGN_UP (grub_file_size (files[i]), 4);
|
|
|
c4e390 |
+ if (grub_add (size, ALIGN_UP (grub_file_size (files[i]), 4), &size))
|
|
|
c4e390 |
+ {
|
|
|
c4e390 |
+ grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
|
|
|
c4e390 |
+ goto fail;
|
|
|
c4e390 |
+ }
|
|
|
c4e390 |
}
|
|
|
c4e390 |
|
|
|
c4e390 |
initrd_mem = grub_efi_allocate_pages_max (0x3fffffff, BYTES_TO_PAGES(size));
|