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Filename Latest commit message Latest commit date
Peter Zijlstra 25a727233a x86/mm: Fix pti_clone_pgtable() alignment assumption 
[ Upstream commit 41e71dbb0e0a0fe214545fe64af031303a08524c ]

Guenter reported dodgy crashes on an i386-nosmp build using GCC-11
that had the form of endless traps until entry stack exhaust and then
#DF from the stack guard.

It turned out that pti_clone_pgtable() had alignment assumptions on
the start address, notably it hard assumes start is PMD aligned. This
is true on x86_64, but very much not true on i386.

These assumptions can cause the end condition to malfunction, leading
to a 'short' clone. Guess what happens when the user mapping has a
short copy of the entry text?

Use the correct increment form for addr to avoid alignment
assumptions.

Fixes: 16a3fe634f ("x86/mm/pti: Clone kernel-image on PTE level for 32 bit")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20240731163105.GG33588@noisy.programming.kicks-ass.net
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-08-19 05:33:46 +02:00
arch x86/mm: Fix pti_clone_pgtable() alignment assumption 2024-08-19 05:33:46 +02:00
block
certs
crypto crypto: ecrdsa - Fix module auto-load on add_key 2024-06-16 13:28:51 +02:00
Documentation ASoC: dt-bindings: rt5645: add cbj sleeve gpio property 2024-06-16 13:28:31 +02:00
drivers irqchip/mbigen: Fix mbigen node address layout 2024-08-19 05:33:45 +02:00
fs protect the fetch of ->fd[fd] in do_dup2() from mispredictions 2024-08-19 05:33:45 +02:00
include genirq: Allow irq_chip registration functions to take a const irq_chip 2024-08-19 05:33:45 +02:00
init
ipc
kernel genirq: Allow irq_chip registration functions to take a const irq_chip 2024-08-19 05:33:45 +02:00
lib kobject_uevent: Fix OOB access within zap_modalias_env() 2024-08-19 05:33:38 +02:00
LICENSES
mm mm: avoid overflows in dirty throttling logic 2024-08-19 05:33:42 +02:00
net netfilter: ipset: Add list flush to cancel_gc 2024-08-19 05:33:45 +02:00
samples
scripts kconfig: remove wrong expr_trans_bool() 2024-07-27 10:38:29 +02:00
security apparmor: Fix null pointer deref when receiving skb during sock creation 2024-08-19 05:33:42 +02:00
sound ALSA: usb-audio: Correct surround channels in UAC1 channel map 2024-08-19 05:33:45 +02:00
tools libbpf: Fix no-args func prototype BTF dumping syntax 2024-08-19 05:33:41 +02:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
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COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile Linux 5.4.281 2024-07-27 10:38:33 +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.