Re: [PATCH v3] sg: mitigate read/write abuse

[Martin K. Petersen]

Jann,

> As Al Viro noted in commit 128394eff343 ("sg_write()/bsg_write() is
> not fit to be called under KERNEL_DS"), sg improperly accesses
> userspace memory outside the provided buffer, permitting kernel memory
> corruption via splice().  But it doesn't just do it on ->write(), also
> on ->read().
>
> As a band-aid, make sure that the ->read() and ->write() handlers can
> not be called in weird contexts (kernel context or credentials
> different from file opener), like for ib_safe_file_access().

Applied to 4.18/scsi-fixes with the naming fix pointed out by Doug.

Thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering