net: nfs: fix file handle length in NFSv3 #6
+13
−5
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
The NFS protocol uses file handles to refer to file or directory.
In NFSv2 file handles have a fixed size of 32 bytes.
In NFSv3 file handles have a variable length up to 64 bytes. This is
also true for the MOUNT protocol. [1]
When the NFSv3 server replies with a file handle length > 32 bytes, U-Boot
only copies 32 bytes of that file handle and the next LOOKUP Call fails:
BIOS> nfs ${loadaddr} 192.168.1.51:/nfsroot/opos93dev-br/boot/Image
Using ethernet@428a0000 device
File transfer via NFS from server 192.168.1.51; our IP address is 192.168.1.133
Filename '/nfsroot/opos93dev-br/boot/Image'.
Load address: 0x80400000
Loading: *** ERROR: File lookup fail
done
BIOS>
Looking at this transfer in Wireshark, we can see that the server
replies with the following file handle:
length: 36
[hash (CRC-32): 0x230ac67b]
FileHandle: 0100070101005e000000000091763911f87c449fa73c298552db19ba0c9f60002980cfd2
and U-Boot sends the following file handle in the next LOOKUP Call:
length: 32
[hash (CRC-32): 0x6314131b]
FileHandle: 000000240100070101005e000000000091763911f87c449fa73c298552db19ba
Fix this by using a variable length file handle for dirfh.
[1] https://www.rfc-editor.org/rfc/rfc1813.html#page-106
Fixes: b0baca9 ("net: NFS: Add NFSv3 support")
Signed-off-by: Sébastien Szymanski <[email protected]>
Tested-by: Andrew Davis <[email protected]>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
cherry-pick d298656 form u-boot/u-boot to fix file handle length in NFSv3.
[1] (https://www.rfc-editor.org/rfc/rfc1813.html#page-11)
the url https://www.denx.de/wiki/U-Boot/Patches was disappear, so i can only pr here.
here is the original commit comment:
net: nfs: fix file handle length in NFSv3
The NFS protocol uses file handles to refer to file or directory.
In NFSv2 file handles have a fixed size of 32 bytes.
In NFSv3 file handles have a variable length up to 64 bytes. This is
also true for the MOUNT protocol. [1]
When the NFSv3 server replies with a file handle length > 32 bytes, U-Boot
only copies 32 bytes of that file handle and the next LOOKUP Call fails:
BIOS> nfs ${loadaddr} 192.168.1.51:/nfsroot/opos93dev-br/boot/Image
Using ethernet@428a0000 device
File transfer via NFS from server 192.168.1.51; our IP address is 192.168.1.133
Filename '/nfsroot/opos93dev-br/boot/Image'.
Load address: 0x80400000
Loading: *** ERROR: File lookup fail
done
BIOS>
Looking at this transfer in Wireshark, we can see that the server
replies with the following file handle:
and U-Boot sends the following file handle in the next LOOKUP Call:
Fix this by using a variable length file handle for dirfh.
[1] https://www.rfc-editor.org/rfc/rfc1813.html#page-106
Fixes: u-boot/u-boot@b0baca9 ("net: NFS: Add NFSv3 support")
Signed-off-by: Sébastien Szymanski [email protected]
Tested-by: Andrew Davis [email protected]