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c5de60cd62
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Namhyung Kim c5de60cd62 perf/core: Fix cgroup event list management 
The active cgroup events are managed in the per-cpu cgrp_cpuctx_list.
This list is only accessed from current cpu and not protected by any
locks.  But from the commit ef54c1a476 ("perf: Rework
perf_event_exit_event()"), it's possible to access (actually modify)
the list from another cpu.

In the perf_remove_from_context(), it can remove an event from the
context without an IPI when the context is not active.  This is not
safe with cgroup events which can have some active events in the
context even if ctx->is_active is 0 at the moment.  The target cpu
might be in the middle of list iteration at the same time.

If the event is enabled when it's about to be closed, it might call
perf_cgroup_event_disable() and list_del() with the cgrp_cpuctx_list
on a different cpu.

This resulted in a crash due to an invalid list pointer access during
the cgroup list traversal on the cpu which the event belongs to.

Let's fallback to IPI to access the cgrp_cpuctx_list from that cpu.
Similarly, perf_install_in_context() should use IPI for the cgroup
events too.

Fixes: ef54c1a476 ("perf: Rework perf_event_exit_event()")
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220124195808.2252071-1-namhyung@kernel.org
2022-01-26 15:06:06 +01:00
arch x86/perf: Avoid warning for Arch LBR without XSAVE 2022-01-18 12:09:49 +01:00
block Convert xfs/iomap to use folios 2022-01-12 12:51:41 -08:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto tpmdd updates for Linux v5.17 2022-01-11 12:58:41 -08:00
Documentation - qcom: misc updates to qcom-ipcc driver 2022-01-13 11:19:07 -08:00
drivers - qcom: misc updates to qcom-ipcc driver 2022-01-13 11:19:07 -08:00
fs dax + libnvdimm for v5.17 2022-01-12 15:46:11 -08:00
include perf: Fix perf_event_read_local() time 2022-01-18 12:09:47 +01:00
init Peter Zijlstra says: 2022-01-12 16:26:58 -08:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-11-20 10:35:54 -08:00
kernel perf/core: Fix cgroup event list management 2022-01-26 15:06:06 +01:00
lib Convert much of the page cache to use folios 2022-01-12 12:37:02 -08:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm dax + libnvdimm for v5.17 2022-01-12 15:46:11 -08:00
net TTY/Serial driver updates for 5.17-rc1 2022-01-12 11:21:52 -08:00
samples - Get rid of all the .fixup sections because this generates 2022-01-12 16:31:19 -08:00
scripts - Get rid of all the .fixup sections because this generates 2022-01-12 16:31:19 -08:00
security fs.idmapped.v5.17 2022-01-11 14:26:55 -08:00
sound sound fixes for 5.16-rc7 2021-12-23 09:55:58 -08:00
tools - Get rid of all the .fixup sections because this generates 2022-01-12 16:31:19 -08:00
usr initramfs: Check timestamp to prevent broken cpio archive 2021-10-24 13:48:40 +09:00
virt Peter Zijlstra says: 2022-01-12 16:26:58 -08:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap media updates for v5.17-rc1 2022-01-10 18:55:43 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Updates for the time(r) subsystem: 2022-01-13 09:02:27 -08:00
Makefile - Get rid of all the .fixup sections because this generates 2022-01-12 16:31:19 -08:00
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.