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David Hildenbrand 46c22ffd27 s390/uv: fully validate the VMA before calling follow_page() 
We should not walk/touch page tables outside of VMA boundaries when
holding only the mmap sem in read mode. Evil user space can modify the
VMA layout just before this function runs and e.g., trigger races with
page table removal code since commit dd2283f260 ("mm: mmap: zap pages
with read mmap_sem in munmap").

find_vma() does not check if the address is >= the VMA start address;
use vma_lookup() instead.

Fixes: 214d9bbcd3 ("s390/mm: provide memory management functions for protected KVM guests")
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Link: https://lore.kernel.org/r/20210909162248.14969-6-david@redhat.com
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2021-10-25 09:20:38 +02:00
arch s390/uv: fully validate the VMA before calling follow_page() 2021-10-25 09:20:38 +02:00
block
certs
crypto
Documentation Devicetree fixes for v5.15, take 2: 2021-09-18 12:40:55 -07:00
drivers KVM/arm64 fixes for 5.15, take #1 2021-09-24 06:04:42 -04:00
fs iov_iter.3-5.15-2021-09-17 2021-09-17 09:23:44 -07:00
include KVM/arm64 fixes for 5.15, take #1 2021-09-24 06:04:42 -04:00
init
ipc
kernel entry: rseq: Call rseq_handle_notify_resume() in tracehook_notify_resume() 2021-09-22 10:24:01 -04:00
lib pci_iounmap'2: Electric Boogaloo: try to make sense of it all 2021-09-19 17:13:35 -07:00
LICENSES
mm
net
samples
scripts Kbuild fixes for v5.15 2021-09-19 12:55:12 -07:00
security
sound
tools selftests: KVM: Explicitly use movq to read xmm registers 2021-09-24 02:32:58 -04:00
usr
virt KVM: Remove tlbs_dirty 2021-09-23 11:01:12 -04:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
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MAINTAINERS
Makefile Linux 5.15-rc2 2021-09-19 17:28:22 -07:00
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.