CVE-2024-26692

In the Linux kernel, the following vulnerability has been resolved:

smb: Fix regression in writes when non-standard maximum write size negotiated

The conversion to netfs in the 6.3 kernel caused a regression when

maximum write size is set by the server to an unexpected value which is

not a multiple of 4096 (similarly if the user overrides the maximum

write size by setting mount parm "wsize", but sets it to a value that

is not a multiple of 4096). When negotiated write size is not a

multiple of 4096 the netfs code can skip the end of the final

page when doing large sequential writes, causing data corruption.

This section of code is being rewritten/removed due to a large

netfs change, but until that point (ie for the 6.3 kernel until now)

we can not support non-standard maximum write sizes.

Add a warning if a user specifies a wsize on mount that is not

a multiple of 4096 (and round down), also add a change where we

round down the maximum write size if the server negotiates a value

that is not a multiple of 4096 (we also have to check to make sure that

we do not round it down to zero).