mirror of
https://src.fedoraproject.org/rpms/grub2.git
synced 2024-11-24 14:32:58 +00:00
134 lines
5.1 KiB
Diff
134 lines
5.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Darren Kenny <darren.kenny@oracle.com>
|
|
Date: Tue, 29 Mar 2022 15:52:46 +0000
|
|
Subject: [PATCH] fs/btrfs: Fix more ASAN and SEGV issues found with fuzzing
|
|
|
|
The fuzzer is generating btrfs file systems that have chunks with
|
|
invalid combinations of stripes and substripes for the given RAID
|
|
configurations.
|
|
|
|
After examining the Linux kernel fs/btrfs/tree-checker.c code, it
|
|
appears that sub-stripes should only be applied to RAID10, and in that
|
|
case there should only ever be 2 of them.
|
|
|
|
Similarly, RAID single should only have 1 stripe, and RAID1/1C3/1C4
|
|
should have 2. 3 or 4 stripes respectively, which is what redundancy
|
|
corresponds.
|
|
|
|
Some of the chunks ended up with a size of 0, which grub_malloc() still
|
|
returned memory for and in turn generated ASAN errors later when
|
|
accessed.
|
|
|
|
While it would be possible to specifically limit the number of stripes,
|
|
a more correct test was on the combination of the chunk item, and the
|
|
number of stripes by the size of the chunk stripe structure in
|
|
comparison to the size of the chunk itself.
|
|
|
|
Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
|
|
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
(cherry picked from commit 3849647b4b98a4419366708fc4b7f339c6f55ec7)
|
|
---
|
|
grub-core/fs/btrfs.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++
|
|
1 file changed, 55 insertions(+)
|
|
|
|
diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
|
|
index 2fcfb738fe..0e9b450413 100644
|
|
--- a/grub-core/fs/btrfs.c
|
|
+++ b/grub-core/fs/btrfs.c
|
|
@@ -941,6 +941,12 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data, grub_disk_addr_t addr,
|
|
return grub_error (GRUB_ERR_BAD_FS,
|
|
"couldn't find the chunk descriptor");
|
|
|
|
+ if (!chsize)
|
|
+ {
|
|
+ grub_dprintf ("btrfs", "zero-size chunk\n");
|
|
+ return grub_error (GRUB_ERR_BAD_FS,
|
|
+ "got an invalid zero-size chunk");
|
|
+ }
|
|
chunk = grub_malloc (chsize);
|
|
if (!chunk)
|
|
return grub_errno;
|
|
@@ -999,6 +1005,16 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data, grub_disk_addr_t addr,
|
|
stripe_length = grub_divmod64 (grub_le_to_cpu64 (chunk->size),
|
|
nstripes,
|
|
NULL);
|
|
+
|
|
+ /* For single, there should be exactly 1 stripe. */
|
|
+ if (grub_le_to_cpu16 (chunk->nstripes) != 1)
|
|
+ {
|
|
+ grub_dprintf ("btrfs", "invalid RAID_SINGLE: nstripes != 1 (%u)\n",
|
|
+ grub_le_to_cpu16 (chunk->nstripes));
|
|
+ return grub_error (GRUB_ERR_BAD_FS,
|
|
+ "invalid RAID_SINGLE: nstripes != 1 (%u)",
|
|
+ grub_le_to_cpu16 (chunk->nstripes));
|
|
+ }
|
|
if (stripe_length == 0)
|
|
stripe_length = 512;
|
|
stripen = grub_divmod64 (off, stripe_length, &stripe_offset);
|
|
@@ -1018,6 +1034,19 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data, grub_disk_addr_t addr,
|
|
stripen = 0;
|
|
stripe_offset = off;
|
|
csize = grub_le_to_cpu64 (chunk->size) - off;
|
|
+
|
|
+ /*
|
|
+ * Redundancy, and substripes only apply to RAID10, and there
|
|
+ * should be exactly 2 sub-stripes.
|
|
+ */
|
|
+ if (grub_le_to_cpu16 (chunk->nstripes) != redundancy)
|
|
+ {
|
|
+ grub_dprintf ("btrfs", "invalid RAID1: nstripes != %u (%u)\n",
|
|
+ redundancy, grub_le_to_cpu16 (chunk->nstripes));
|
|
+ return grub_error (GRUB_ERR_BAD_FS,
|
|
+ "invalid RAID1: nstripes != %u (%u)",
|
|
+ redundancy, grub_le_to_cpu16 (chunk->nstripes));
|
|
+ }
|
|
break;
|
|
}
|
|
case GRUB_BTRFS_CHUNK_TYPE_RAID0:
|
|
@@ -1054,6 +1083,20 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data, grub_disk_addr_t addr,
|
|
stripe_offset = low + chunk_stripe_length
|
|
* high;
|
|
csize = chunk_stripe_length - low;
|
|
+
|
|
+ /*
|
|
+ * Substripes only apply to RAID10, and there
|
|
+ * should be exactly 2 sub-stripes.
|
|
+ */
|
|
+ if (grub_le_to_cpu16 (chunk->nsubstripes) != 2)
|
|
+ {
|
|
+ grub_dprintf ("btrfs", "invalid RAID10: nsubstripes != 2 (%u)",
|
|
+ grub_le_to_cpu16 (chunk->nsubstripes));
|
|
+ return grub_error (GRUB_ERR_BAD_FS,
|
|
+ "invalid RAID10: nsubstripes != 2 (%u)",
|
|
+ grub_le_to_cpu16 (chunk->nsubstripes));
|
|
+ }
|
|
+
|
|
break;
|
|
}
|
|
case GRUB_BTRFS_CHUNK_TYPE_RAID5:
|
|
@@ -1153,6 +1196,8 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data, grub_disk_addr_t addr,
|
|
|
|
for (j = 0; j < 2; j++)
|
|
{
|
|
+ grub_size_t est_chunk_alloc = 0;
|
|
+
|
|
grub_dprintf ("btrfs", "chunk 0x%" PRIxGRUB_UINT64_T
|
|
"+0x%" PRIxGRUB_UINT64_T
|
|
" (%d stripes (%d substripes) of %"
|
|
@@ -1165,6 +1210,16 @@ grub_btrfs_read_logical (struct grub_btrfs_data *data, grub_disk_addr_t addr,
|
|
grub_dprintf ("btrfs", "reading laddr 0x%" PRIxGRUB_UINT64_T "\n",
|
|
addr);
|
|
|
|
+ if (grub_mul (sizeof (struct grub_btrfs_chunk_stripe),
|
|
+ grub_le_to_cpu16 (chunk->nstripes), &est_chunk_alloc) ||
|
|
+ grub_add (est_chunk_alloc,
|
|
+ sizeof (struct grub_btrfs_chunk_item), &est_chunk_alloc) ||
|
|
+ est_chunk_alloc > chunk->size)
|
|
+ {
|
|
+ err = GRUB_ERR_BAD_FS;
|
|
+ break;
|
|
+ }
|
|
+
|
|
if (is_raid56)
|
|
{
|
|
err = btrfs_read_from_chunk (data, chunk, stripen,
|