mirror of
https://src.fedoraproject.org/rpms/grub2.git
synced 2024-11-24 06:22:43 +00:00
4b81c6f969
(CVE-2023-4692) (CVE-2023-4693) Resolves: #2236613 Resolves: #2241978 Resolves: #2241976 Resolves: #2238343 Signed-off-by: Nicolas Frayer <nfrayer@redhat.com>
70 lines
2.4 KiB
Diff
70 lines
2.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Maxim Suhanov <dfirblog@gmail.com>
|
|
Date: Tue, 3 Oct 2023 19:12:25 +0200
|
|
Subject: [PATCH] fs/ntfs: Fix an OOB read when parsing directory entries from
|
|
resident and non-resident index attributes
|
|
|
|
This fix introduces checks to ensure that index entries are never read
|
|
beyond the corresponding directory index.
|
|
|
|
The lack of this check is a minor issue, likely not exploitable in any way.
|
|
|
|
Reported-by: Maxim Suhanov <dfirblog@gmail.com>
|
|
Signed-off-by: Maxim Suhanov <dfirblog@gmail.com>
|
|
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
---
|
|
grub-core/fs/ntfs.c | 13 +++++++++++--
|
|
1 file changed, 11 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/grub-core/fs/ntfs.c b/grub-core/fs/ntfs.c
|
|
index 1949d48a494f..72302033281a 100644
|
|
--- a/grub-core/fs/ntfs.c
|
|
+++ b/grub-core/fs/ntfs.c
|
|
@@ -599,7 +599,7 @@ get_utf8 (grub_uint8_t *in, grub_size_t len)
|
|
}
|
|
|
|
static int
|
|
-list_file (struct grub_ntfs_file *diro, grub_uint8_t *pos,
|
|
+list_file (struct grub_ntfs_file *diro, grub_uint8_t *pos, grub_uint8_t *end_pos,
|
|
grub_fshelp_iterate_dir_hook_t hook, void *hook_data)
|
|
{
|
|
grub_uint8_t *np;
|
|
@@ -610,6 +610,9 @@ list_file (struct grub_ntfs_file *diro, grub_uint8_t *pos,
|
|
grub_uint8_t namespace;
|
|
char *ustr;
|
|
|
|
+ if ((pos >= end_pos) || (end_pos - pos < 0x52))
|
|
+ break;
|
|
+
|
|
if (pos[0xC] & 2) /* end signature */
|
|
break;
|
|
|
|
@@ -617,6 +620,9 @@ list_file (struct grub_ntfs_file *diro, grub_uint8_t *pos,
|
|
ns = *(np++);
|
|
namespace = *(np++);
|
|
|
|
+ if (2 * ns > end_pos - pos - 0x52)
|
|
+ break;
|
|
+
|
|
/*
|
|
* Ignore files in DOS namespace, as they will reappear as Win32
|
|
* names.
|
|
@@ -802,7 +808,9 @@ grub_ntfs_iterate_dir (grub_fshelp_node_t dir,
|
|
}
|
|
|
|
cur_pos += 0x10; /* Skip index root */
|
|
- ret = list_file (mft, cur_pos + u16at (cur_pos, 0), hook, hook_data);
|
|
+ ret = list_file (mft, cur_pos + u16at (cur_pos, 0),
|
|
+ at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR),
|
|
+ hook, hook_data);
|
|
if (ret)
|
|
goto done;
|
|
|
|
@@ -889,6 +897,7 @@ grub_ntfs_iterate_dir (grub_fshelp_node_t dir,
|
|
(const grub_uint8_t *) "INDX")))
|
|
goto done;
|
|
ret = list_file (mft, &indx[0x18 + u16at (indx, 0x18)],
|
|
+ indx + (mft->data->idx_size << GRUB_NTFS_BLK_SHR),
|
|
hook, hook_data);
|
|
if (ret)
|
|
goto done;
|