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Filename Latest commit message Latest commit date
Milton Miller 978bef91ca powerpc/vdso: Fix vdso cpu truncation 
[ Upstream commit a9f675f950a07d5c1dbcbb97aabac56f5ed085e3 ]

The code in vdso_cpu_init that exposes the cpu and numa node to
userspace via SPRG_VDSO incorrctly masks the cpu to 12 bits. This means
that any kernel running on a box with more than 4096 threads (NR_CPUS
advertises a limit of of 8192 cpus) would expose userspace to two cpu
contexts running at the same time with the same cpu number.

Note: I'm not aware of any distro shipping a kernel with support for more
than 4096 threads today, nor of any system image that currently exceeds
4096 threads. Found via code browsing.

Fixes: 18ad51dd34 ("powerpc: Add VDSO version of getcpu")
Signed-off-by: Milton Miller <miltonm@us.ibm.com>
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200715233704.1352257-1-anton@ozlabs.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-08-19 08:16:12 +02:00
arch powerpc/vdso: Fix vdso cpu truncation 2020-08-19 08:16:12 +02:00
block iocost: Fix check condition of iocg abs_vdebt 2020-08-19 08:15:58 +02:00
certs
crypto keys: asymmetric: fix error return code in software_key_query() 2020-07-22 09:33:04 +02:00
Documentation iio: improve IIO_CONCENTRATION channel type description 2020-08-19 08:16:07 +02:00
drivers mwifiex: Prevent memory corruption handling keys 2020-08-19 08:16:12 +02:00
fs kernfs: do not call fsnotify() with name without a parent 2020-08-19 08:16:12 +02:00
include ipvs: allow connection reuse for unconfirmed conntrack 2020-08-19 08:16:10 +02:00
init x86: Fix early boot crash on gcc-10, third try 2020-05-20 08:20:34 +02:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:20:16 +02:00
kernel seccomp: Fix ioctl number for SECCOMP_IOCTL_NOTIF_ID_VALID 2020-08-19 08:15:58 +02:00
lib kobject: Avoid premature parent object freeing in kobject_cleanup() 2020-08-19 08:16:11 +02:00
LICENSES
mm mm/mmap.c: Add cond_resched() for exit_mmap() CPU stalls 2020-08-19 08:16:02 +02:00
net ipvs: allow connection reuse for unconfirmed conntrack 2020-08-19 08:16:10 +02:00
samples bpf: Fix fds_example SIGSEGV error 2020-08-19 08:16:03 +02:00
scripts recordmcount: only record relocation of type R_AARCH64_CALL26 on arm64. 2020-08-19 08:15:57 +02:00
security ima: move APPRAISE_BOOTPARAM dependency on ARCH_POLICY to runtime 2020-08-11 15:33:41 +02:00
sound ASoC: Intel: bxt_rt298: add missing .owner field 2020-08-19 08:16:08 +02:00
tools seccomp: Fix ioctl number for SECCOMP_IOCTL_NOTIF_ID_VALID 2020-08-19 08:15:58 +02:00
usr initramfs: restore default compression behavior 2020-04-08 09:08:38 +02:00
virt KVM: arm64: Don't inherit exec permission across page-table levels 2020-08-05 09:59:51 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap ARM: SoC fixes 2019-11-10 13:41:59 -08:00
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 17:22:19 +01:00
Makefile Linux 5.4.58 2020-08-11 15:33:42 +02:00
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.