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Change History

https://project-zero.issues.chromium.org/issues/417522668

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

io_uring/fdinfo: grab ctx->uring_lock around io_uring_show_fdinfo()

Not everything requires locking in there, which is why the 'has_lock'
variable exists. But enough does that it's a bit unwieldy to manage.
Wrap the whole thing in a ->uring_lock trylock, and just return
with no output if we fail to grab it. The existing trylock() will
already have greatly diminished utility/output for the failure case.

This fixes an issue with reading the SQE fields, if the ring is being
actively resized at the same time.

https://git.kernel.org/stable/c/bdb7d2ec2e31c46c45d1f32667dfa8216a72705e

https://git.kernel.org/stable/c/d871198ee431d90f5308d53998c1ba1d5db5619a