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74 lines
2.4 KiB
74 lines
2.4 KiB
3 months ago
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From 7e5f031a6a6a3decc2360a7b0c71abbe598e7354 Mon Sep 17 00:00:00 2001
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From: Maxim Suhanov <dfirblog@gmail.com>
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Date: Mon, 28 Aug 2023 16:33:17 +0300
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Subject: [PATCH 3/6] fs/ntfs: Fix an OOB read when parsing directory entries
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from resident and non-resident index attributes
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This fix introduces checks to ensure that index entries are never read
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beyond the corresponding directory index.
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The lack of this check is a minor issue, likely not exploitable in any way.
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Reported-by: Maxim Suhanov <dfirblog@gmail.com>
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Signed-off-by: Maxim Suhanov <dfirblog@gmail.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/fs/ntfs.c | 13 +++++++++++--
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1 file changed, 11 insertions(+), 2 deletions(-)
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diff --git a/grub-core/fs/ntfs.c b/grub-core/fs/ntfs.c
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index a68e173d8285..2d78b96e19fb 100644
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--- a/grub-core/fs/ntfs.c
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+++ b/grub-core/fs/ntfs.c
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@@ -599,7 +599,7 @@ get_utf8 (grub_uint8_t *in, grub_size_t len)
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}
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static int
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-list_file (struct grub_ntfs_file *diro, grub_uint8_t *pos,
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+list_file (struct grub_ntfs_file *diro, grub_uint8_t *pos, grub_uint8_t *end_pos,
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grub_fshelp_iterate_dir_hook_t hook, void *hook_data)
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{
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grub_uint8_t *np;
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@@ -610,6 +610,9 @@ list_file (struct grub_ntfs_file *diro, grub_uint8_t *pos,
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grub_uint8_t namespace;
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char *ustr;
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+ if ((pos >= end_pos) || (end_pos - pos < 0x52))
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+ break;
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+
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if (pos[0xC] & 2) /* end signature */
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break;
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@@ -617,6 +620,9 @@ list_file (struct grub_ntfs_file *diro, grub_uint8_t *pos,
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ns = *(np++);
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namespace = *(np++);
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+ if (2 * ns > end_pos - pos - 0x52)
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+ break;
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+
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/*
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* Ignore files in DOS namespace, as they will reappear as Win32
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* names.
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@@ -806,7 +812,9 @@ grub_ntfs_iterate_dir (grub_fshelp_node_t dir,
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}
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cur_pos += 0x10; /* Skip index root */
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- ret = list_file (mft, cur_pos + u16at (cur_pos, 0), hook, hook_data);
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+ ret = list_file (mft, cur_pos + u16at (cur_pos, 0),
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+ at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR),
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+ hook, hook_data);
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if (ret)
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goto done;
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@@ -893,6 +901,7 @@ grub_ntfs_iterate_dir (grub_fshelp_node_t dir,
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(const grub_uint8_t *) "INDX")))
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goto done;
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ret = list_file (mft, &indx[0x18 + u16at (indx, 0x18)],
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+ indx + (mft->data->idx_size << GRUB_NTFS_BLK_SHR),
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hook, hook_data);
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if (ret)
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goto done;
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--
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2.43.0
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