APPLIED: [SRU][N/J][PATCH 0/1] CVE-2024-39292

[Stefan Bader]

On 12.07.24 18:29, Bethany Jamison wrote:
> [Impact]
> 
> um: Add winch to winch_handlers before registering winch IRQ
> 
> Registering a winch IRQ is racy, an interrupt may occur before the winch is
> added to the winch_handlers list.
> 
> If that happens, register_winch_irq() adds to that list a winch that is
> scheduled to be (or has already been) freed, causing a panic later in
> winch_cleanup().
> 
> Avoid the race by adding the winch to the winch_handlers list before
> registering the IRQ, and rolling back if um_request_irq() fails.
> 
> [Fix]
> 
> Noble:	Clean cherry-pick from linux-6.9.y
> Jammy:	Noble patch applied cleanly
> Focal:	pending (5.4.0-192.212)
> Bionic:	fix sent to esm ML
> Xenial: fix sent to esm ML
> Trusty: not going to be fixed by us
> 
> [Test Case]
> 
> Compile and boot tested.
> 
> [Where problems could occur]
> 
> This fix affects those who use User-Mode Linux, an issue with
> this fix would be visible to the user via unpredicted system
> behavior.
> 
> Roberto Sassu (1):
>    um: Add winch to winch_handlers before registering winch IRQ
> 
>   arch/um/drivers/line.c | 14 ++++++++------
>   1 file changed, 8 insertions(+), 6 deletions(-)
> 

Applied to noble,jammy:linux/master-next. Thanks.

-Stefan

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