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Jann Horn c3b1e88f14 mm: Force TLB flush for PFNMAP mappings before unlink_file_vma() 
commit b67fbebd4c upstream.

Some drivers rely on having all VMAs through which a PFN might be
accessible listed in the rmap for correctness.
However, on X86, it was possible for a VMA with stale TLB entries
to not be listed in the rmap.

This was fixed in mainline with
commit b67fbebd4c ("mmu_gather: Force tlb-flush VM_PFNMAP vmas"),
but that commit relies on preceding refactoring in
commit 18ba064e42 ("mmu_gather: Let there be one tlb_{start,end}_vma()
implementation") and commit 1e9fdf21a4 ("mmu_gather: Remove per arch
tlb_{start,end}_vma()").

This patch provides equivalent protection without needing that
refactoring, by forcing a TLB flush between removing PTEs in
unmap_vmas() and the call to unlink_file_vma() in free_pgtables().

[This is a stable-specific rewrite of the upstream commit!]
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-09-05 10:26:32 +02:00
arch s390: fix double free of GS and RI CBs on fork() failure 2022-09-05 10:26:32 +02:00
block blk-iolatency: Fix inflight count imbalances and IO hangs on offline 2022-06-14 16:59:30 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-25 11:49:16 +02:00
crypto crypto: drbg - make reseeding from get_random_bytes() synchronous 2022-06-25 11:49:13 +02:00
Documentation locking/atomic: Make test_and_*_bit() ordered on failure 2022-08-25 11:15:42 +02:00
drivers scsi: storvsc: Remove WQ_MEM_RECLAIM from storvsc_error_wq 2022-09-05 10:26:32 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:21:29 +01:00
fs btrfs: check if root is readonly while setting security xattr 2022-09-05 10:26:31 +02:00
include asm-generic: sections: refactor memory_intersects 2022-09-05 10:26:32 +02:00
init random: handle latent entropy and command line from random_init() 2022-06-25 11:49:11 +02:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-08 08:50:11 +01:00
kernel sched/deadline: Fix priority inheritance with multiple scheduling classes 2022-09-05 10:26:28 +02:00
lib ratelimit: Fix data-races in ___ratelimit(). 2022-09-05 10:26:30 +02:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm mm: Force TLB flush for PFNMAP mappings before unlink_file_vma() 2022-09-05 10:26:32 +02:00
net net: Fix a data-race around sysctl_somaxconn. 2022-09-05 10:26:31 +02:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-26 11:36:11 +01:00
scripts gcc-plugins: Undefine LATENT_ENTROPY_PLUGIN when plugin disabled for a file 2022-08-25 11:15:42 +02:00
security apparmor: Fix memleak in aa_simple_write_to_buffer() 2022-08-25 11:15:36 +02:00
sound ALSA: timer: Use deferred fasync helper 2022-08-25 11:15:46 +02:00
tools tools build: Switch to new openssl API for test-libcrypto 2022-08-25 11:15:39 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:44:59 +02:00
virt KVM: Add infrastructure and macro to mark VM as bugged 2022-08-25 11:15:31 +02:00
.clang-format clang-format: Set IndentWrappedFunctionNames false 2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
.mailmap libnvdimm-for-4.19_misc 2018-08-25 18:13:10 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS 9p: remove Ron Minnich from MAINTAINERS 2018-08-17 16:20:26 -07:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS MAINTAINERS: co-maintain random.c 2022-06-25 11:49:01 +02:00
Makefile Linux 4.19.256 2022-08-25 11:15:49 +02:00
README Docs: Added a pointer to the formatted docs to README 2018-03-21 09:02:53 -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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.