mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-09-17 09:41:09 +02:00
Paolo Abeni
cd23e77e65
Cong Wang says: ==================== net_sched: make ->qlen_notify() idempotent Gerrard reported a vulnerability exists in fq_codel where manipulating the MTU can cause codel_dequeue() to drop all packets. The parent qdisc's sch->q.qlen is only updated via ->qlen_notify() if the fq_codel queue remains non-empty after the drops. This discrepancy in qlen between fq_codel and its parent can lead to a use-after-free condition. Let's fix this by making all existing ->qlen_notify() idempotent so that the sch->q.qlen check will be no longer necessary. Patch 1~5 make all existing ->qlen_notify() idempotent to prepare for patch 6 which removes the sch->q.qlen check. They are followed by 5 selftests for each type of Qdisc's we touch here. All existing and new Qdisc selftests pass after this patchset. Fixes:4b549a2ef4("fq_codel: Fair Queue Codel AQM") Fixes:76e3cc126b("codel: Controlled Delay AQM") Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> ==================== Link: https://patch.msgid.link/20250403211033.166059-1-xiyou.wangcong@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.