On 11/29/21 9:01 AM, Jeff Layton wrote:
On Mon, 2021-11-29 at 08:35 -0700, Tim Gardner wrote:
Hi Len,
I have a report (https://bugs.launchpad.net/bugs/1952094) that commit f980d055a0f858d73d9467bb0b570721bbfcdfb8 ("CIFS: Fix a potencially linear read overflow") causes a regression as a stable backport in a 5.4 based kernel. I don't know if this regression exists in tip as well, or if it is unique to the backported environment. I suspect, given the content of the patch, that it is generic. As such, it has been backported to a number of stable releases:
linux-4.4.y.txt:0955df2d9bf4857e3e2287e3028903e6cec06c30 linux-4.9.y.txt:8878af780747f498551b7d360cae61b415798f18 linux-4.14.y.txt:20967547ffc6039f17c63a1c24eb779ee166b245 linux-4.19.y.txt:bea655491daf39f1934a71bf576bf3499092d3a4 linux-5.4.y.txt:b444064a0e0ef64491b8739a9ae05a952b5f8974 linux-5.10.y.txt:6c4857203ffa36918136756a889b12c5864bc4ad linux-5.13.y.txt:9bffe470e9b537075345406512df01ca2188b725 linux-5.14.y.txt:c41dd61c86482ab34f6f039b13296308018fd99b
Could this be an off-by-one issue if the source string is full length ?
rtg
Maybe? But it doesn't seem to be that long. The error message evidently says:
"CIFS VFS: CIFS mount error: iocharset utf8 not found"The iocharset string ("utf8" here) usually gets set in the mount string and then we just pass that string to load_nls().
The patch you're pointing out though doesn't seem to be involved in any of that. It sounds like something else is wrong. I'd validate that that patch was applied correctly, and get more details about what this guy is doing.
g/l!
You may be correct. I made the rash assumption the reporter had done a normal full upgrade. However, it appears he may have only done targeted package updates and neglected the linux-modules-extra package that contains the nls_utf8 module. My test kernel installation instructions _did_ include linux-modules-extra which is likely why it worked for him.
I've requested more info from the reporter to verify that the missing package is the root of his problem.
Thanks for responding.
rtg ----------- Tim Gardner Canonical, Inc