Description
In the Linux kernel, the following vulnerability has been resolved: ipc/shm: serialize orphan cleanup with shm_nattch updates shm_destroy_orphaned() walks the shm idr under shm_ids(ns).rwsem, but that does not serialize all fields tested by shm_may_destroy(). In particular, shm_nattch is updated while holding shm_perm.lock, and attach paths can do that without holding the rwsem. Do not decide that an orphaned segment is unused before taking the object lock. Move the shm_may_destroy() check under shm_perm.lock, matching the other destroy paths, and unlock the segment when it no longer qualifies for removal.
Affected products
- Linux / Linux4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – b1e9aef48e4d8a0c1b54fb913077b0824ed7d650
- Linux / Linux4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – 92cda2593cf2ed25b0e9d78e5e6d8303bba1a064
- Linux / Linux4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – 1f0d01e35dbb228084d5187212e32c91a30dcbeb
- Linux / Linux4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – 6560be3f6a5bb84f006f184f0c966747bb58e1a3
- Linux / Linux4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – b5107b4ce3ad45fcf369ee2058c8910620f4b5a8
- Linux / Linux4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – db752ebfdaf2c7f27cd9690ef48b616af068319c
- Linux / Linux4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – 030bbc857bd51d4b25a90d931d3f8775ef22823a
- Linux / Linux4c677e2eefdba9c5bfc4474e2e91b26ae8458a1d – 2e5c6f4fd4001562781e99bbfc7f1f0127187542
- Linux / Linux3.1 – 3.1
- Linux / Linux0 – 3.1
- Linux / Linux5.10.259 – 5.10.*
- Linux / Linux5.15.210 – 5.15.*
- Linux / Linux6.1.176 – 6.1.*
- Linux / Linux6.6.143 – 6.6.*
- Linux / Linux6.12.94 – 6.12.*
- Linux / Linux6.18.36 – 6.18.*
- Linux / Linux7.0.13 – 7.0.*
- Linux / Linux7.1 – *
References
- MISChttps://git.kernel.org/stable/c/b1e9aef48e4d8a0c1b54fb913077b0824ed7d650
- MISChttps://git.kernel.org/stable/c/92cda2593cf2ed25b0e9d78e5e6d8303bba1a064
- MISChttps://git.kernel.org/stable/c/1f0d01e35dbb228084d5187212e32c91a30dcbeb
- MISChttps://git.kernel.org/stable/c/6560be3f6a5bb84f006f184f0c966747bb58e1a3
- MISChttps://git.kernel.org/stable/c/b5107b4ce3ad45fcf369ee2058c8910620f4b5a8
- MISChttps://git.kernel.org/stable/c/db752ebfdaf2c7f27cd9690ef48b616af068319c
- MISChttps://git.kernel.org/stable/c/030bbc857bd51d4b25a90d931d3f8775ef22823a
- MISChttps://git.kernel.org/stable/c/2e5c6f4fd4001562781e99bbfc7f1f0127187542