ptrace: require CAP_SYS_PTRACE when task has no mm
kABI-safe AlmaLinux backport of upstream commit 31e62c2ebbfd
("ptrace: slightly saner 'get_dumpable()' logic"). The upstream
fix adds a user_dumpable bit to task_struct and caches it from
exit_mm() -- both layout changes would break the kABI signature
of struct task_struct (referenced by stablelist exports such as
set_cpus_allowed_ptr and wake_up_process).
Instead, take the minimal kABI-safe slice: in __ptrace_may_access(),
when task->mm == NULL, require CAP_SYS_PTRACE in init_user_ns
unconditionally. This closes the Qualys Security Advisory hole
without touching task_struct or exit.c. The only behavioural
delta versus upstream is that an already-exited user task whose
mm has been cleared now also requires CAP_SYS_PTRACE.
===================
The Kernel dist-git
===================
The kernel is maintained in a `source tree`_ rather than directly in dist-git.
The specfile is maintained as a `template`_ in the source tree along with a set
of build scripts to generate configurations, (S)RPMs, and to populate the
dist-git repository.
The `documentation`_ for the source tree covers how to contribute and maintain
the tree.
If you're looking for the downstream patch set it's available in the source
tree with "git log master..ark-patches" or
`online`_.
Each release in dist-git is tagged in the source repository so you can easily
check out the source tree for a build. The tags are in the format
name-version-release, but note release doesn't contain the dist tag since the
source can be built in different build roots (Fedora, CentOS, etc.)
.. _source tree: https://gitlab.com/cki-project/kernel-ark.git
.. _template: https://gitlab.com/cki-project/kernel-ark/-/blob/os-build/redhat/kernel.spec.template
.. _documentation: https://gitlab.com/cki-project/kernel-ark/-/wikis/home
.. _online: https://gitlab.com/cki-project/kernel-ark/-/commits/ark-patches
Andrew Lukoshko
cc48c27cd1