Re: [RFC PATCH] ipc/msg: Use dedicated slab buckets for msg_msgseg

[Christian Brauner]

On Mon, 18 May 2026 20:26:31 +0200, Philipp Weber wrote:
> System V message queues already allocate struct msg_msg from dedicated
> kmem buckets, so user-controlled variable-sized message allocations do
> not share generic kmalloc buckets.
> 
> Large messages allocate additional struct msg_msgseg objects for the
> remaining payload. These allocations are also user-controlled in size
> and contents, but still come from generic kmalloc-cg buckets.
> 
> [...]

Applied to the kernel-7.2.misc branch of the vfs/vfs.git tree.
Patches in the kernel-7.2.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: kernel-7.2.misc

[1/1] ipc/msg: Use dedicated slab buckets for msg_msgseg
      https://git.kernel.org/vfs/vfs/c/6cedbc997a94