From 7a5a116739fa6d8a625da7d6b9272c9a2462f967 Mon Sep 17 00:00:00 2001
From: Maxim Suhanov <[email protected]>
Date: Mon, 28 Aug 2023 16:33:44 +0300
Subject: [PATCH 4/6] fs/ntfs: Fix an OOB read when parsing bitmaps for index
 attributes

This fix introduces checks to ensure that bitmaps for directory indices
are never read beyond their actual sizes.

The lack of this check is a minor issue, likely not exploitable in any way.

Reported-by: Maxim Suhanov <[email protected]>
Signed-off-by: Maxim Suhanov <[email protected]>
Reviewed-by: Daniel Kiper <[email protected]>
---
 grub-core/fs/ntfs.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/grub-core/fs/ntfs.c b/grub-core/fs/ntfs.c
index 2d78b96e19fb..bb70c89fb803 100644
--- a/grub-core/fs/ntfs.c
+++ b/grub-core/fs/ntfs.c
@@ -843,6 +843,25 @@ grub_ntfs_iterate_dir (grub_fshelp_node_t dir,
 
 	  if (is_resident)
 	    {
+              if (bitmap_len > (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR))
+		{
+		  grub_error (GRUB_ERR_BAD_FS, "resident bitmap too large");
+		  goto done;
+		}
+
+              if (cur_pos >= at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR))
+		{
+		  grub_error (GRUB_ERR_BAD_FS, "resident bitmap out of range");
+		  goto done;
+		}
+
+              if (u16at (cur_pos, 0x14) + u32at (cur_pos, 0x10) >
+		  (grub_addr_t) at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR) - (grub_addr_t) cur_pos)
+		{
+		  grub_error (GRUB_ERR_BAD_FS, "resident bitmap out of range");
+		  goto done;
+		}
+
               grub_memcpy (bmp, cur_pos + u16at (cur_pos, 0x14),
                            bitmap_len);
 	    }
-- 
2.43.0