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Filename Latest commit message Latest commit date
Kees Cook 03475167fd x86: Increase brk randomness entropy for 64-bit systems 
[ Upstream commit 44c76825d6eefee9eb7ce06c38e1a6632ac7eb7d ]

In commit c1d171a002 ("x86: randomize brk"), arch_randomize_brk() was
defined to use a 32MB range (13 bits of entropy), but was never increased
when moving to 64-bit. The default arch_randomize_brk() uses 32MB for
32-bit tasks, and 1GB (18 bits of entropy) for 64-bit tasks.

Update x86_64 to match the entropy used by arm64 and other 64-bit
architectures.

Reported-by: y0un9n132@gmail.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Jiri Kosina <jkosina@suse.com>
Closes: https://lore.kernel.org/linux-hardening/CA+2EKTVLvc8hDZc+2Yhwmus=dzOUG5E4gV7ayCbu0MPJTZzWkw@mail.gmail.com/
Link: https://lore.kernel.org/r/20240217062545.1631668-1-keescook@chromium.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-09-04 13:14:55 +02:00
arch x86: Increase brk randomness entropy for 64-bit systems 2024-09-04 13:14:55 +02:00
block
certs
crypto crypto: ecrdsa - Fix module auto-load on add_key 2024-06-16 13:28:51 +02:00
Documentation overflow: Implement size_t saturating arithmetic helpers 2024-09-04 13:14:51 +02:00
drivers md: clean up invalid BUG_ON in md_ioctl 2024-09-04 13:14:55 +02:00
fs virtiofs: forbid newlines in tags 2024-09-04 13:14:55 +02:00
include overflow: Implement size_t saturating arithmetic helpers 2024-09-04 13:14:51 +02:00
init
ipc
kernel tracing: Fix overflow in get_free_elt() 2024-08-19 05:33:53 +02:00
lib overflow: Implement size_t saturating arithmetic helpers 2024-09-04 13:14:51 +02:00
LICENSES
mm memcg_write_event_control(): fix a user-triggerable oops 2024-09-04 13:14:50 +02:00
net netfilter: nf_tables: prefer nft_chain_validate 2024-08-19 05:33:54 +02:00
samples
scripts kbuild: Fix '-S -c' in x86 stack protector scripts 2024-08-19 05:33:53 +02:00
security selinux: fix potential counting error in avc_add_xperms_decision() 2024-09-04 13:14:50 +02:00
sound ALSA: hda/realtek: Fix noise from speakers on Lenovo IdeaPad 3 15IAU7 2024-09-04 13:14:53 +02:00
tools bitmap: introduce generic optimized bitmap_size() 2024-09-04 13:14:50 +02:00
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Makefile Linux 5.4.282 2024-08-19 05:33:54 +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.