On 09/26/2017 06:25 PM, Tom Rini wrote:
On Mon, Sep 25, 2017 at 10:06:31PM +0300, Tuomas Tynkkynen wrote:
The current code doesn't compute the group descriptor checksum correctly
for the filesystems that e2fsprogs 1.43.4 creates (they have
'Group descriptor size: 64' as reported by tune2fs). Extend the checksum
calculation to be done as ext4_group_desc_csum() does in Linux.
This fixes these errors in dmesg from running fs-test.sh and makes it
succeed again:
[1671902.620699] EXT4-fs (loop1): ext4_check_descriptors: Checksum for group 0
failed (35782!=10965)
[1671902.620706] EXT4-fs (loop1): group descriptors corrupted!
Signed-off-by: Tuomas Tynkkynen <tuomas.tynkky...@iki.fi>
---
v2: New patch
---
fs/ext4/ext4_common.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c
index 621c61e5c7..31952f48b9 100644
--- a/fs/ext4/ext4_common.c
+++ b/fs/ext4/ext4_common.c
@@ -432,6 +432,10 @@ uint16_t ext4fs_checksum_update(uint32_t i)
crc = ext2fs_crc16(crc, desc, offset);
offset += sizeof(desc->bg_checksum); /* skip checksum */
assert(offset == sizeof(*desc));
+ if (offset < fs->gdsize) {
+ crc = ext2fs_crc16(crc, (__u8 *)desc + offset,
+ fs->gdsize - offset);
+ }
This would be feb0ab32a57e4e6c8b24f6fb68f0ce08efe4603c from the kernel?
No, it goes further back, to 2007 even(!): 717d50e4971b81b96c0199c91cdf0
So shouldn't we have le16_to_cpu on fs->gdsize ? Or did I read over the
'git log -p' output in the kernel too quickly? Thanks!
No, because fs->gdsize is already endian-swapped elsewhere:
2345 fs->gdsize = le32_to_cpu(data->sblock.feature_incompat) &
2346 EXT4_FEATURE_INCOMPAT_64BIT ?
2347 le16_to_cpu(data->sblock.descriptor_size) : 32;
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