Re: [PATCH v5.10 1/1] io_uring: Use original task for req identity in io_identity_cow()

On 7/19/22 5:52 AM, Lee Jones wrote:

This issue is conceptually identical to the one fixed in 29f077d07051 ("io_uring: always use original task when preparing req identity"), so rather than reinvent the wheel, I'm shamelessly quoting the commit message from that patch - thanks Jens:

"If the ring is setup with IORING_SETUP_IOPOLL and we have more than one task doing submissions on a ring, we can up in a situation where we assign the context from the current task rather than the request originator.

Always use req->task rather than assume it's the same as current.

No upstream patch exists for this issue, as only older kernels with the non-native workers have this problem."

Greg, can you pick this one up for 5.10-stable? Thanks!