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Filename Latest commit message Latest commit date
David Hildenbrand b23c0c4c9e s390/mm: validate VMA in PGSTE manipulation functions 
commit fe3d10024073f06f04c74b9674bd71ccc1d787cf upstream.

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"). gfn_to_hva() will only translate using
KVM memory regions, but won't validate the VMA.

Further, we should not allocate page tables outside of VMA boundaries: if
evil user space decides to map hugetlbfs to these ranges, bad things will
happen because we suddenly have PTE or PMD page tables where we
shouldn't have them.

Similarly, we have to check if we suddenly find a hugetlbfs VMA, before
calling get_locked_pte().

Fixes: 2d42f94773 ("s390/kvm: Add PGSTE manipulation functions")
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lore.kernel.org/r/20210909162248.14969-4-david@redhat.com
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-01 09:23:34 +01:00
arch s390/mm: validate VMA in PGSTE manipulation functions 2021-12-01 09:23:34 +01:00
block
certs
crypto crypto: pcrypt - Delay write to padata->info 2021-11-17 09:48:40 +01:00
Documentation netfilter: ipvs: Fix reuse connection if RS weight is 0 2021-12-01 09:23:31 +01:00
drivers vhost/vsock: fix incorrect used length reported to the guest 2021-12-01 09:23:34 +01:00
fs smb3: do not error on fsync when readonly 2021-12-01 09:23:34 +01:00
include net: ipv6: add fib6_nh_release_dsts stub 2021-12-01 09:23:33 +01:00
init
ipc ipc: WARN if trying to remove ipc object which is absent 2021-11-26 10:47:21 +01:00
kernel tracing: Check pid filtering when creating events 2021-12-01 09:23:34 +01:00
lib
LICENSES
mm hugetlbfs: flush TLBs correctly after huge_pmd_unshare 2021-11-26 10:47:23 +01:00
net net/smc: Don't call clcsock shutdown twice when smc shutdown 2021-12-01 09:23:34 +01:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-17 09:48:39 +01:00
scripts
security fortify: Explicitly disable Clang support 2021-11-21 13:38:50 +01:00
sound ASoC: topology: Add missing rwsem around snd_ctl_remove() calls 2021-12-01 09:23:32 +01:00
tools perf tests: Remove bash construct from record+zstd_comp_decomp.sh 2021-11-26 10:47:18 +01:00
usr
virt
.clang-format
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Makefile Linux 5.4.162 2021-11-26 10:47:23 +01:00
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.