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

[Manuel Diewald]

On Fri, Jul 12, 2024 at 11:29:33AM -0500, 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(-)
> 
> -- 
> 2.34.1
> 
> 
> -- 
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team

Acked-by: Manuel Diewald <manuel.diewald at canonical.com>

-- 
 Manuel
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <https://lists.ubuntu.com/archives/kernel-team/attachments/20240712/718660ac/attachment.sig>