a64c498922
- Add patch to fix reading files from btrfs with "implicit" holes: * 0001-fs-btrfs-Zero-file-data-not-backed-by-extents.patch OBS-URL: https://build.opensuse.org/request/show/1115856 OBS-URL: https://build.opensuse.org/package/show/Base:System/grub2?expand=0&rev=467
34 lines
1.1 KiB
Diff
34 lines
1.1 KiB
Diff
From f903b9a9adb64e733e581771d2a24efae7fbe529 Mon Sep 17 00:00:00 2001
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From: Fabian Vogt <fvogt@suse.de>
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Date: Thu, 5 Oct 2023 11:02:25 +0200
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Subject: [PATCH] fs/btrfs: Zero file data not backed by extents
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Implicit holes in file data need to be zeroed explicitly, instead of
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just leaving the data in the buffer uninitialized.
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This led to kernels randomly failing to boot in "fun" ways when loaded
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from btrfs with the no_holes feature enabled, because large blocks of
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zeros in the kernel file contained random data instead.
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Signed-off-by: Fabian Vogt <fvogt@suse.de>
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---
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grub-core/fs/btrfs.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
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index 19bff4610..ba0c58352 100644
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--- a/grub-core/fs/btrfs.c
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+++ b/grub-core/fs/btrfs.c
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@@ -1603,6 +1603,8 @@ grub_btrfs_extent_read (struct grub_btrfs_data *data,
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csize = grub_le_to_cpu64 (key_out.offset) - pos;
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if (csize > len)
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csize = len;
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+
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+ grub_memset (buf, 0, csize);
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buf += csize;
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pos += csize;
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len -= csize;
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--
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2.42.0
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