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Christian Brauner ac19091288 coredump: hand a pidfd to the usermode coredump helper commit `b5325b2a27` upstream. Give userspace a way to instruct the kernel to install a pidfd into the usermode helper process. This makes coredump handling a lot more reliable for userspace. In parallel with this commit we already have systemd adding support for this in [1]. We create a pidfs file for the coredumping process when we process the corename pattern. When the usermode helper process is forked we then install the pidfs file as file descriptor three into the usermode helpers file descriptor table so it's available to the exec'd program. Since usermode helpers are either children of the system_unbound_wq workqueue or kthreadd we know that the file descriptor table is empty and can thus always use three as the file descriptor number. Note, that we'll install a pidfd for the thread-group leader even if a subthread is calling do_coredump(). We know that task linkage hasn't been removed due to delay_group_leader() and even if this @current isn't the actual thread-group leader we know that the thread-group leader cannot be reaped until @current has exited. [brauner: This is a backport for the v6.1 series. Upstream has significantly changed and backporting all that infra is a non-starter. So simply backport the pidfd_prepare() helper and waste the file descriptor we allocated. Then we minimally massage the umh coredump setup code.] Link: https://github.com/systemd/systemd/pull/37125 [1] Link: https://lore.kernel.org/20250414-work-coredump-v2-3-685bf231f828@kernel.org Tested-by: Luca Boccassi <luca.boccassi@gmail.com> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-06-04 14:40:25 +02:00
arch	arm64: dts: qcom: sm8350: Fix typo in pil_camera_mem node	2025-06-04 14:40:25 +02:00
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crypto	crypto: algif_hash - fix double free in hash_accept	2025-06-04 14:40:20 +02:00
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drivers	perf/arm-cmn: Initialise cmn->cpu earlier	2025-06-04 14:40:25 +02:00
fs	coredump: hand a pidfd to the usermode coredump helper	2025-06-04 14:40:25 +02:00
include	coredump: hand a pidfd to the usermode coredump helper	2025-06-04 14:40:25 +02:00
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io_uring	io_uring: fix overflow resched cqe reordering	2025-06-04 14:40:20 +02:00
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kernel	fork: use pidfd_prepare()	2025-06-04 14:40:25 +02:00
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mm	mm/page_alloc.c: avoid infinite retries caused by cpuset race	2025-06-04 14:40:21 +02:00
net	net_sched: hfsc: Address reentrant enqueue adding class to eltree twice	2025-06-04 14:40:25 +02:00
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sound	ALSA: hda/realtek: Add quirk for Lenovo Yoga Pro 7 14ASP10	2025-06-04 14:40:21 +02:00
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Makefile	kbuild: Disable -Wdefault-const-init-unsafe	2025-06-04 14:40:22 +02:00
README

README

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 Restructured Text 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.