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Eric Biggers f235bc11cc crypto: arm/aes-neonbs - go back to using aes-arm directly 
In aes-neonbs, instead of going through the crypto API for the parts
that the bit-sliced AES code doesn't handle, namely AES-CBC encryption
and single-block AES, just call the ARM scalar AES cipher directly.

This basically goes back to the original approach that was used before
commit b56f5cbc7e ("crypto: arm/aes-neonbs - resolve fallback cipher
at runtime").  Calling the ARM scalar AES cipher directly is faster,
simpler, and avoids any chance of bugs specific to the use of fallback
ciphers such as module loading deadlocks which have happened twice.  The
deadlocks turned out to be fixable in other ways, but there's no need to
rely on anything so fragile in the first place.

The rationale for the above-mentioned commit was to allow people to
choose to use a time-invariant AES implementation for the fallback
cipher.  There are a couple problems with that rationale, though:

- In practice the ARM scalar AES cipher (aes-arm) was used anyway, since
  it has a higher priority than aes-fixed-time.  Users *could* go out of
  their way to disable or blacklist aes-arm, or to lower its priority
  using NETLINK_CRYPTO, but very few users customize the crypto API to
  this extent.  Systems with the ARMv8 Crypto Extensions used aes-ce,
  but the bit-sliced algorithms are irrelevant on such systems anyway.

- Since commit 913a3aa07d ("crypto: arm/aes - add some hardening
  against cache-timing attacks"), the ARM scalar AES cipher is partially
  hardened against cache-timing attacks.  It actually works like
  aes-fixed-time, in that it disables interrupts and prefetches its
  lookup table.  It does use a larger table than aes-fixed-time, but
  even so, it is not clear that aes-fixed-time is meaningfully more
  time-invariant than aes-arm.  And of course, the real solution for
  time-invariant AES is to use a CPU that supports AES instructions.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2024-08-17 13:55:50 +08:00
arch crypto: arm/aes-neonbs - go back to using aes-arm directly 2024-08-17 13:55:50 +08:00
block block: fix deadlock between sd_remove & sd_release 2024-07-24 09:51:21 -06:00
certs kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
crypto crypto: chacha20poly1305 - Annotate struct chachapoly_ctx with __counted_by() 2024-08-17 13:55:49 +08:00
Documentation dt-bindings: rng: Add Rockchip RK3568 TRNG 2024-08-10 12:25:34 +08:00
drivers crypto: nx - Use static_assert() to check struct sizes 2024-08-17 13:55:50 +08:00
fs This pull request contains updates (actually, just fixes) for UBI and UBIFS: 2024-07-28 11:51:51 -07:00
include Revert "lib/mpi: Introduce ec implementation to MPI library" 2024-08-10 12:25:34 +08:00
init Rust changes for v6.11 2024-07-27 13:44:54 -07:00
io_uring io_uring/napi: pass ktime to io_napi_adjust_timeout 2024-07-26 08:31:59 -06:00
ipc sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
kernel padata: use integer wrap around to prevent deadlock on seq_nr overflow 2024-08-17 13:55:50 +08:00
lib Revert "lib/mpi: Introduce ec implementation to MPI library" 2024-08-10 12:25:34 +08:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/page_alloc: fix pcp->count race between drain_pages_zone() vs __rmqueue_pcplist() 2024-07-26 14:33:09 -07:00
net minmax: add a few more MIN_T/MAX_T users 2024-07-28 13:41:14 -07:00
rust Rust changes for v6.11 2024-07-27 13:44:54 -07:00
samples Driver core changes for 6.11-rc1 2024-07-25 10:42:22 -07:00
scripts Kbuild fixes for v6.11 2024-07-28 14:02:48 -07:00
security apparmor-pr-2024-07-24 PR 2024-07-25 2024-07-27 13:28:39 -07:00
sound Devicetree fixes for 6.11, part 1 2024-07-27 12:46:16 -07:00
tools turbostat release 2024.07.26 2024-07-28 10:52:15 -07:00
usr initramfs: shorten cmd_initfs in usr/Makefile 2024-07-16 01:07:52 +09:00
virt KVM generic changes for 6.11 2024-07-16 09:51:36 -04:00
.clang-format Docs: Move clang-format from process/ to dev-tools/ 2024-06-26 16:36:00 -06:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: add script and target to generate pacman package 2024-07-22 01:24:22 +09:00
.mailmap MAINTAINERS: mailmap: update James Clark's email address 2024-07-26 14:32:35 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS tracing: Update of MAINTAINERS and CREDITS file 2024-07-18 14:08:42 -07:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS hwrng: rockchip - add hwrng driver for Rockchip RK3568 SoC 2024-08-10 12:25:34 +08:00
Makefile Linux 6.11-rc1 2024-07-28 14:19:55 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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 reStructuredText 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.