ACK: [SRU][B/F][PATCH 0/1] CVE-2021-3669

[Stefan Bader]

On 17.02.23 18:13, Yuxuan Luo wrote:
> [Impact]
> A flaw was found in the Linux kernel. Measuring usage of the shared memory
> does not scale with large shared memory segment counts which could lead to
> resource exhaustion and DoS.
> 
> [Backport]
> For Bionic, there is a conflict on the condition of the for loop statement
> which a variable introduced at the commit
> 5ac893b8cb10fe2a47a77780d37f9bf5b142854b is expected. It is fine to ignore this
> conflict since the new introduced variable will not be used in the fix commit.
> Also, the `ipc_get_maxidx()` function should be changed to `ipc_get_maxid()`
> since the newer function yet to be introduced until
> 27c331a174614208d0b539019583990967ad9479 which is a trivial and tricky commit;
> therefore, I decided not to cherry pick these commit but use the
> `ipc_get_maxid()` instead.
> For Focal, it is a clean cherry.
> 
> [Test]
> Compile and smoke tested on kvm.
> 
> [Potential Regression]
> Expecting low risk since the optimized logic relies on an existed function and
> all the changes is not beyond the scope of the erroneous function.
> 
> Rafael Aquini (1):
>    ipc: replace costly bailout check in sysvipc_find_ipc()
> 
>   ipc/util.c | 16 ++++------------
>   1 file changed, 4 insertions(+), 12 deletions(-)
> 

Acked-by: Stefan Bader <stefan.bader at canonical.com>
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