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linux: rpi: add ntfs3 corruption fix patch
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From bc49e7136a4bb926bb8743531ae54cc0c721e402 Mon Sep 17 00:00:00 2001
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From: Dom Cobley <popcornmix@gmail.com>
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Date: Tue, 11 Jun 2024 16:12:47 +0100
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Subject: [PATCH] fs/ntfs3: Fix memory corruption when page_size changes
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The rework in fs/ntfs3: Reduce stack usage
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changes log->page_size but doesn't change the associated
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log->page_mask and log->page_bits.
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That results in the bytes value in read_log_page
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getting a negative value, which is bad when it is
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passed to memcpy.
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The kernel panic can be observed when connecting an
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ntfs formatted drive that has previously been connected
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to a Windows machine to a Raspberry Pi 5, which by defauilt
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uses a 16K kernel pagesize.
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Fixes: 865e7a7700d9 ("fs/ntfs3: Reduce stack usage")
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Signed-off-by: Dom Cobley <popcornmix@gmail.com>
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---
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fs/ntfs3/fslog.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/fs/ntfs3/fslog.c b/fs/ntfs3/fslog.c
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index 855519713bf79..b3b83565365e3 100644
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--- a/fs/ntfs3/fslog.c
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+++ b/fs/ntfs3/fslog.c
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@@ -3906,6 +3906,8 @@ int log_replay(struct ntfs_inode *ni, bool *initialized)
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log->l_size = log->orig_file_size;
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log->page_size = norm_file_page(t32, &log->l_size,
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t32 == DefaultLogPageSize);
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+ log->page_mask = log->page_size - 1;
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+ log->page_bits = blksize_bits(log->page_size);
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}
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if (log->page_size != t32 ||
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