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Pawan Gupta 03438f330e x86/pm: Add enumeration check before spec MSRs save/restore setup 
commit 50bcceb772 upstream.

pm_save_spec_msr() keeps a list of all the MSRs which _might_ need
to be saved and restored at hibernate and resume. However, it has
zero awareness of CPU support for these MSRs. It mostly works by
unconditionally attempting to manipulate these MSRs and relying on
rdmsrl_safe() being able to handle a #GP on CPUs where the support is
unavailable.

However, it's possible for reads (RDMSR) to be supported for a given MSR
while writes (WRMSR) are not. In this case, msr_build_context() sees
a successful read (RDMSR) and marks the MSR as valid. Then, later, a
write (WRMSR) fails, producing a nasty (but harmless) error message.
This causes restore_processor_state() to try and restore it, but writing
this MSR is not allowed on the Intel Atom N2600 leading to:

  unchecked MSR access error: WRMSR to 0x122 (tried to write 0x0000000000000002) \
     at rIP: 0xffffffff8b07a574 (native_write_msr+0x4/0x20)
  Call Trace:
   <TASK>
   restore_processor_state
   x86_acpi_suspend_lowlevel
   acpi_suspend_enter
   suspend_devices_and_enter
   pm_suspend.cold
   state_store
   kernfs_fop_write_iter
   vfs_write
   ksys_write
   do_syscall_64
   ? do_syscall_64
   ? up_read
   ? lock_is_held_type
   ? asm_exc_page_fault
   ? lockdep_hardirqs_on
   entry_SYSCALL_64_after_hwframe

To fix this, add the corresponding X86_FEATURE bit for each MSR.  Avoid
trying to manipulate the MSR when the feature bit is clear. This
required adding a X86_FEATURE bit for MSRs that do not have one already,
but it's a small price to pay.

  [ bp: Move struct msr_enumeration inside the only function that uses it. ]

Fixes: 73924ec4d5 ("x86/pm: Save the MSR validity status at context setup")
Reported-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/c24db75d69df6e66c0465e13676ad3f2837a2ed8.1668539735.git.pawan.kumar.gupta@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-04-19 17:56:42 +08:00
arch x86/pm: Add enumeration check before spec MSRs save/restore setup 2023-04-19 17:56:42 +08:00
block block, bfq: fix null pointer dereference in bfq_bio_bfqg() 2023-04-19 17:56:33 +08:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2023-04-19 17:50:34 +08:00
crypto crypto: akcipher - default implementation for setting a private key 2023-04-19 17:55:27 +08:00
Documentation docs: update mediator contact information in CoC doc 2023-04-19 17:56:27 +08:00
drivers usb: dwc3: gadget: Clear ep descriptor last 2023-04-19 17:56:41 +08:00
fs nilfs2: fix nilfs_sufile_mark_dirty() not set segment usage as dirty 2023-04-19 17:56:41 +08:00
include rxrpc: Use refcount_t rather than atomic_t 2023-04-19 17:56:35 +08:00
init init/Kconfig: fix CC_HAS_ASM_GOTO_TIED_OUTPUT test with dash 2023-04-19 17:56:40 +08:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2023-04-19 17:49:52 +08:00
kernel gcov: clang: fix the buffer overflow issue 2023-04-19 17:56:41 +08:00
lib lib/vdso: use "grep -E" instead of "egrep" 2023-04-19 17:56:40 +08:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm: vmscan: fix extreme overreclaim and swap floods 2023-04-19 17:56:41 +08:00
net ipv4: Fix error return code in fib_table_insert() 2023-04-19 17:56:39 +08:00
samples samples/landlock: Format with clang-format 2023-04-19 17:50:01 +08:00
scripts cert host tools: Stop complaining about deprecated OpenSSL functions 2023-04-19 17:56:14 +08:00
security capabilities: fix potential memleak on error path from vfs_getxattr_alloc() 2023-04-19 17:56:03 +08:00
sound ASoC: max98373: Add checks for devm_kcalloc 2023-04-19 17:56:34 +08:00
tools selftests: mptcp: fix mibit vs mbit mix up 2023-04-19 17:56:35 +08:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2023-04-19 17:44:58 +08:00
virt kvm: Add support for arch compat vm ioctls 2023-04-19 17:55:40 +08:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Input: goodix - add a goodix.h header file 2023-04-19 17:50:59 +08:00
Makefile Linux 5.15.80 2023-04-19 17:56:30 +08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -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 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.