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Miaohe Lin cdb2b590c1 mm/memremap: fix memunmap_pages() race with get_dev_pagemap() 
[ Upstream commit 1e57ffb6e3 ]

Think about the below scene:

 CPU1			CPU2
 memunmap_pages
   percpu_ref_exit
     __percpu_ref_exit
       free_percpu(percpu_count);
         /* percpu_count is freed here! */
			 get_dev_pagemap
			   xa_load(&pgmap_array, PHYS_PFN(phys))
			     /* pgmap still in the pgmap_array */
			   percpu_ref_tryget_live(&pgmap->ref)
			     if __ref_is_percpu
			       /* __PERCPU_REF_ATOMIC_DEAD not set yet */
			       this_cpu_inc(*percpu_count)
			         /* access freed percpu_count here! */
      ref->percpu_count_ptr = __PERCPU_REF_ATOMIC_DEAD;
        /* too late... */
   pageunmap_range

To fix the issue, do percpu_ref_exit() after pgmap_array is emptied. So
we won't do percpu_ref_tryget_live() against a being freed percpu_ref.

Link: https://lkml.kernel.org/r/20220609121305.2508-1-linmiaohe@huawei.com
Fixes: b7b3c01b19 ("mm/memremap_pages: support multiple ranges per invocation")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-04-19 17:52:31 +08:00
arch KVM: SVM: Stuff next_rip on emulated INT3 injection if NRIPS is supported 2023-04-19 17:52:29 +08:00
block blk-mq: don't create hctx debugfs dir until q->debugfs_dir is created 2023-04-19 17:52:14 +08:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2023-04-19 17:50:34 +08:00
crypto crypto: memneq - move into lib/ 2023-04-19 17:50:35 +08:00
Documentation media: hevc: Embedded indexes in RPS 2023-04-19 17:52:24 +08:00
drivers memremap: remove support for external pgmap refcounts 2023-04-19 17:52:31 +08:00
fs fs: check FMODE_LSEEK to control internal pipe splicing 2023-04-19 17:52:24 +08:00
include memremap: remove support for external pgmap refcounts 2023-04-19 17:52:31 +08:00
init stack: Declare {randomize_,}kstack_offset to fix Sparse warnings 2023-04-19 17:52:12 +08:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2023-04-19 17:49:52 +08:00
kernel wireguard: ratelimiter: use hrtimer in selftest 2023-04-19 17:52:27 +08:00
lib lib/test_hmm: avoid accessing uninitialized pages 2023-04-19 17:52:30 +08:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/memremap: fix memunmap_pages() race with get_dev_pagemap() 2023-04-19 17:52:31 +08:00
net dccp: put dccp_qpolicy_full() and dccp_qpolicy_push() in the same lock 2023-04-19 17:52:27 +08:00
samples samples/landlock: Format with clang-format 2023-04-19 17:50:01 +08:00
scripts x86/extable: Rework the exception table mechanics 2023-04-19 17:51:45 +08:00
security selinux: Add boundary check in put_entry() 2023-04-19 17:52:09 +08:00
sound ALSA: hda/realtek: Add a quirk for HP OMEN 15 (8786) mute LED 2023-04-19 17:52:00 +08:00
tools memremap: remove support for external pgmap refcounts 2023-04-19 17:52:31 +08:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2023-04-19 17:44:58 +08:00
virt KVM: Don't null dereference ops->destroy 2023-04-19 17:51:45 +08:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.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 mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
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 Input: goodix - add a goodix.h header file 2023-04-19 17:50:59 +08:00
Makefile Makefile: link with -z noexecstack --no-warn-rwx-segments 2023-04-19 17:51:58 +08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.