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Fix an out of memory error when loading large initrd images

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Resolves: rhbz#1838633

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
This commit is contained in:
Javier Martinez Canillas 2020-05-26 18:04:42 +02:00
parent 7fb7a6a7a5
commit 098a8a9e99
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3 changed files with 46 additions and 1 deletions
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40
0219-x86-efi-Reduce-maximum-bounce-buffer-size-to-16-MiB.patch Normal file
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@ -0,0 +1,40 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Tue, 26 May 2020 16:59:28 +0200
Subject: [PATCH] x86-efi: Reduce maximum bounce buffer size to 16 MiB
The EFI linux loader allocates a bounce buffer to copy the initrd since in
some machines doing DMA on addresses above 4GB is not possible during EFI.
But the verifiers framework also allocates a buffer to copy the initrd in
its grub_file_open() handler. It does this since the data to verify has to
be passed as a single chunk to modules that use the verifiers framework.
If the initrd image size is big there may not be enough memory in the heap
to allocate two buffers of that size. This causes an allocation failure in
the verifiers framework and leads to the initrd not being read.
To prevent these allocation failures, let's reduce the maximum size of the
bounce buffer used in the EFI loader. Since the data read can be copied to
the actual initrd address in multilple chunks.
Resolves: rhbz#1838633
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
grub-core/loader/i386/efi/linux.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c
index 50b7798d6e5..e5b2736b0ce 100644
--- a/grub-core/loader/i386/efi/linux.c
+++ b/grub-core/loader/i386/efi/linux.c
@@ -144,7 +144,7 @@ grub_linuxefi_unload (void)
return GRUB_ERR_NONE;
}
-#define BOUNCE_BUFFER_MAX 0x10000000ull
+#define BOUNCE_BUFFER_MAX 0x1000000ull
static grub_ssize_t
read(grub_file_t file, grub_uint8_t *bufp, grub_size_t len)

1
grub.patches
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@ -216,3 +216,4 @@ Patch0215: 0215-10_linux.in-restore-existence-check-in-get_sorted_bl.patch
Patch0216: 0216-tpm-Don-t-propagate-TPM-measurement-errors-to-the-ve.patch
Patch0217: 0217-tpm-Enable-module-for-all-EFI-platforms.patch
Patch0218: 0218-10_linux.in-Don-t-update-BLS-files-that-aren-t-manag.patch
Patch0219: 0219-x86-efi-Reduce-maximum-bounce-buffer-size-to-16-MiB.patch

6
grub2.spec
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@ -9,7 +9,7 @@
Name: grub2
Epoch: 1
Version: 2.04
Release: 21%{?dist}
Release: 22%{?dist}
Summary: Bootloader with support for Linux, Multiboot and more
License: GPLv3+
URL: http://www.gnu.org/software/grub/
@ -504,6 +504,10 @@ rm -r /boot/grub2.tmp/ || :
%endif
%changelog
* Tue May 26 2020 Javier Martinez Canillas <javierm@redhat.com> - 2.04-22
- Fix an out of memory error when loading large initrd images
Resolves: rhbz#1838633
* Wed May 20 2020 Javier Martinez Canillas <javierm@redhat.com> - 2.04-21
- Don't update BLS files that aren't managed by GRUB scripts
Resolves: rhbz#1837783