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Mikhail Paulyshka ee21fbcb87 x86/rdrand: Disable RDSEED on AMD Cyan Skillfish 
commit 5b937a1ed6 upstream.

AMD Cyan Skillfish (Family 17h, Model 47h, Stepping 0h) has an error that
causes RDSEED to always return 0xffffffff, while RDRAND works correctly.

Mask the RDSEED cap for this CPU so that both /proc/cpuinfo and direct CPUID
read report RDSEED as unavailable.

  [ bp: Move to amd.c, massage. ]

Signed-off-by: Mikhail Paulyshka <me@mixaill.net>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/20250524145319.209075-1-me@mixaill.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-07-17 18:35:15 +02:00
arch x86/rdrand: Disable RDSEED on AMD Cyan Skillfish 2025-07-17 18:35:15 +02:00
block
certs
crypto crypto: xts - Only add ecb if it is not already there 2025-06-19 15:28:03 +02:00
Documentation x86/bugs: Add a Transient Scheduler Attacks mitigation 2025-07-10 16:03:21 +02:00
drivers pwm: mediatek: Ensure to disable clocks in error path 2025-07-17 18:35:15 +02:00
fs mm: fix the inaccurate memory statistics issue for users 2025-07-17 18:35:14 +02:00
include mm: fix the inaccurate memory statistics issue for users 2025-07-17 18:35:14 +02:00
init
io_uring io_uring: fix task leak issue in io_wq_create() 2025-06-27 11:08:58 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:08:49 +01:00
kernel perf: Revert to requiring CAP_SYS_ADMIN for uprobes 2025-07-17 18:35:08 +02:00
lib maple_tree: fix mt_destroy_walk() on root leaf node 2025-07-17 18:35:14 +02:00
LICENSES
mm mm/vmalloc: leave lazy MMU mode on PTE mapping error 2025-07-17 18:35:15 +02:00
net wifi: prevent A-MSDU attacks in mesh networks 2025-07-17 18:35:13 +02:00
rust rust: module: place cleanup_module() in .exit.text section 2025-07-06 11:00:06 +02:00
samples
scripts scripts/gdb: fix interrupts.py after maple tree conversion 2025-07-17 18:35:15 +02:00
security selinux: fix selinux_xfrm_alloc_user() to set correct ctx_len 2025-06-27 11:08:59 +01:00
sound ASoC: cs35l56: probe() should fail if the device ID is not recognized 2025-07-17 18:35:08 +02:00
tools x86/rdrand: Disable RDSEED on AMD Cyan Skillfish 2025-07-17 18:35:15 +02:00
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Makefile Linux 6.6.98 2025-07-14 15:57:41 +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.