|
 |
b9d01e |
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
|
b9d01e |
From: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
|
|
|
b9d01e |
Date: Wed, 6 Apr 2022 18:03:37 +0530
|
|
|
b9d01e |
Subject: [PATCH] fs/f2fs: Do not read past the end of nat journal entries
|
|
|
b9d01e |
|
|
|
b9d01e |
A corrupt f2fs file system could specify a nat journal entry count
|
|
|
b9d01e |
that is beyond the maximum NAT_JOURNAL_ENTRIES.
|
|
|
b9d01e |
|
|
|
b9d01e |
Check if the specified nat journal entry count before accessing the
|
|
|
b9d01e |
array, and throw an error if it is too large.
|
|
|
b9d01e |
|
|
|
b9d01e |
Signed-off-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
|
|
|
b9d01e |
Signed-off-by: Daniel Axtens <dja@axtens.net>
|
|
|
b9d01e |
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
|
b9d01e |
(cherry picked from commit a3988cb3f0a108dd67ac127a79a4c8479d23334e)
|
|
|
b9d01e |
(cherry picked from commit 7125978aa7d6068812ef6da0ab38ce521ae7eba1)
|
|
|
b9d01e |
(cherry picked from commit e488538cbf9fc63796c7047550b0598e1ef95c03)
|
|
|
b9d01e |
---
|
|
|
b9d01e |
grub-core/fs/f2fs.c | 21 ++++++++++++++-------
|
|
|
b9d01e |
1 file changed, 14 insertions(+), 7 deletions(-)
|
|
|
b9d01e |
|
|
|
b9d01e |
diff --git a/grub-core/fs/f2fs.c b/grub-core/fs/f2fs.c
|
|
|
b9d01e |
index 1cad2615f3..09dc932420 100644
|
|
|
b9d01e |
--- a/grub-core/fs/f2fs.c
|
|
|
b9d01e |
+++ b/grub-core/fs/f2fs.c
|
|
|
b9d01e |
@@ -632,23 +632,27 @@ get_nat_journal (struct grub_f2fs_data *data)
|
|
|
b9d01e |
return err;
|
|
|
b9d01e |
}
|
|
|
b9d01e |
|
|
|
b9d01e |
-static grub_uint32_t
|
|
|
b9d01e |
-get_blkaddr_from_nat_journal (struct grub_f2fs_data *data, grub_uint32_t nid)
|
|
|
b9d01e |
+static grub_err_t
|
|
|
b9d01e |
+get_blkaddr_from_nat_journal (struct grub_f2fs_data *data, grub_uint32_t nid,
|
|
|
b9d01e |
+ grub_uint32_t *blkaddr)
|
|
|
b9d01e |
{
|
|
|
b9d01e |
grub_uint16_t n = grub_le_to_cpu16 (data->nat_j.n_nats);
|
|
|
b9d01e |
- grub_uint32_t blkaddr = 0;
|
|
|
b9d01e |
grub_uint16_t i;
|
|
|
b9d01e |
|
|
|
b9d01e |
+ if (n >= NAT_JOURNAL_ENTRIES)
|
|
|
b9d01e |
+ return grub_error (GRUB_ERR_BAD_FS,
|
|
|
b9d01e |
+ "invalid number of nat journal entries");
|
|
|
b9d01e |
+
|
|
|
b9d01e |
for (i = 0; i < n; i++)
|
|
|
b9d01e |
{
|
|
|
b9d01e |
if (grub_le_to_cpu32 (data->nat_j.entries[i].nid) == nid)
|
|
|
b9d01e |
{
|
|
|
b9d01e |
- blkaddr = grub_le_to_cpu32 (data->nat_j.entries[i].ne.block_addr);
|
|
|
b9d01e |
+ *blkaddr = grub_le_to_cpu32 (data->nat_j.entries[i].ne.block_addr);
|
|
|
b9d01e |
break;
|
|
|
b9d01e |
}
|
|
|
b9d01e |
}
|
|
|
b9d01e |
|
|
|
b9d01e |
- return blkaddr;
|
|
|
b9d01e |
+ return GRUB_ERR_NONE;
|
|
|
b9d01e |
}
|
|
|
b9d01e |
|
|
|
b9d01e |
static grub_uint32_t
|
|
|
b9d01e |
@@ -656,10 +660,13 @@ get_node_blkaddr (struct grub_f2fs_data *data, grub_uint32_t nid)
|
|
|
b9d01e |
{
|
|
|
b9d01e |
struct grub_f2fs_nat_block *nat_block;
|
|
|
b9d01e |
grub_uint32_t seg_off, block_off, entry_off, block_addr;
|
|
|
b9d01e |
- grub_uint32_t blkaddr;
|
|
|
b9d01e |
+ grub_uint32_t blkaddr = 0;
|
|
|
b9d01e |
grub_err_t err;
|
|
|
b9d01e |
|
|
|
b9d01e |
- blkaddr = get_blkaddr_from_nat_journal (data, nid);
|
|
|
b9d01e |
+ err = get_blkaddr_from_nat_journal (data, nid, &blkaddr);
|
|
|
b9d01e |
+ if (err != GRUB_ERR_NONE)
|
|
|
b9d01e |
+ return 0;
|
|
|
b9d01e |
+
|
|
|
b9d01e |
if (blkaddr)
|
|
|
b9d01e |
return blkaddr;
|
|
|
b9d01e |
|