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Sean Christopherson fa297c33fa KVM: x86: Acquire kvm->srcu when handling KVM_SET_VCPU_EVENTS 
commit 4bcdd831d9 upstream.

Grab kvm->srcu when processing KVM_SET_VCPU_EVENTS, as KVM will forcibly
leave nested VMX/SVM if SMM mode is being toggled, and leaving nested VMX
reads guest memory.

Note, kvm_vcpu_ioctl_x86_set_vcpu_events() can also be called from KVM_RUN
via sync_regs(), which already holds SRCU.  I.e. trying to precisely use
kvm_vcpu_srcu_read_lock() around the problematic SMM code would cause
problems.  Acquiring SRCU isn't all that expensive, so for simplicity,
grab it unconditionally for KVM_SET_VCPU_EVENTS.

 =============================
 WARNING: suspicious RCU usage
 6.10.0-rc7-332d2c1d713e-next-vm #552 Not tainted
 -----------------------------
 include/linux/kvm_host.h:1027 suspicious rcu_dereference_check() usage!

 other info that might help us debug this:

 rcu_scheduler_active = 2, debug_locks = 1
 1 lock held by repro/1071:
  #0: ffff88811e424430 (&vcpu->mutex){+.+.}-{3:3}, at: kvm_vcpu_ioctl+0x7d/0x970 [kvm]

 stack backtrace:
 CPU: 15 PID: 1071 Comm: repro Not tainted 6.10.0-rc7-332d2c1d713e-next-vm #552
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
 Call Trace:
  <TASK>
  dump_stack_lvl+0x7f/0x90
  lockdep_rcu_suspicious+0x13f/0x1a0
  kvm_vcpu_gfn_to_memslot+0x168/0x190 [kvm]
  kvm_vcpu_read_guest+0x3e/0x90 [kvm]
  nested_vmx_load_msr+0x6b/0x1d0 [kvm_intel]
  load_vmcs12_host_state+0x432/0xb40 [kvm_intel]
  vmx_leave_nested+0x30/0x40 [kvm_intel]
  kvm_vcpu_ioctl_x86_set_vcpu_events+0x15d/0x2b0 [kvm]
  kvm_arch_vcpu_ioctl+0x1107/0x1750 [kvm]
  ? mark_held_locks+0x49/0x70
  ? kvm_vcpu_ioctl+0x7d/0x970 [kvm]
  ? kvm_vcpu_ioctl+0x497/0x970 [kvm]
  kvm_vcpu_ioctl+0x497/0x970 [kvm]
  ? lock_acquire+0xba/0x2d0
  ? find_held_lock+0x2b/0x80
  ? do_user_addr_fault+0x40c/0x6f0
  ? lock_release+0xb7/0x270
  __x64_sys_ioctl+0x82/0xb0
  do_syscall_64+0x6c/0x170
  entry_SYSCALL_64_after_hwframe+0x4b/0x53
 RIP: 0033:0x7ff11eb1b539
  </TASK>

Fixes: f7e570780e ("KVM: x86: Forcibly leave nested virt when SMM state is toggled")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240723232055.3643811-1-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-09-12 11:10:16 +02:00
arch KVM: x86: Acquire kvm->srcu when handling KVM_SET_VCPU_EVENTS 2024-09-12 11:10:16 +02:00
block block: remove the blk_flush_integrity call in blk_integrity_unregister 2024-09-08 07:53:11 +02:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-02-09 11:28:11 +01:00
crypto crypto: aead,cipher - zeroize key buffer after use 2024-07-11 12:47:05 +02:00
Documentation hwspinlock: Introduce hwspin_lock_bust() 2024-09-08 07:53:09 +02:00
drivers virtio_net: Fix napi_skb_cache_put warning 2024-09-08 07:53:12 +02:00
fs ext4: handle redirtying in ext4_bio_write_page() 2024-09-08 07:53:13 +02:00
include i2c: Use IS_REACHABLE() for substituting empty ACPI functions 2024-09-08 07:53:13 +02:00
init rust: fix the default format for CONFIG_{RUSTC,BINDGEN}_VERSION_TEXT 2024-08-29 17:30:32 +02:00
io_uring io_uring: fix io_match_task must_hold 2024-08-03 08:49:53 +02:00
ipc sysctl: treewide: drop unused argument ctl_table_root::set_ownership(table) 2024-08-11 12:35:51 +02:00
kernel rcu/nocb: Remove buggy bypass lock contention mitigation 2024-09-08 07:53:10 +02:00
lib bitmap: introduce generic optimized bitmap_size() 2024-08-29 17:30:14 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm: Fix missing folio invalidation calls during truncation 2024-09-04 13:25:00 +02:00
net sch/netem: fix use after free in netem_dequeue 2024-09-12 11:10:16 +02:00
rust rust: macros: fix soundness issue in module! macro 2024-05-17 11:56:17 +02:00
samples bpf: Replace bpf_lpm_trie_key 0-length array with flexible array 2024-08-29 17:30:22 +02:00
scripts rust: work around bindgen 0.69.0 issue 2024-08-29 17:30:32 +02:00
security smack: tcp: ipv4, fix incorrect labeling 2024-09-08 07:53:10 +02:00
sound ASoC: dapm: Fix UAF for snd_soc_pcm_runtime object 2024-09-12 11:10:16 +02:00
tools selftests: mptcp: join: cannot rm sf if closed 2024-09-08 07:53:03 +02:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin() 2024-06-27 13:46:21 +02:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.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 MAINTAINERS: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
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 MAINTAINERS: add leah to 6.1 MAINTAINERS file 2024-05-17 11:56:16 +02:00
Makefile Linux 6.1.109 2024-09-08 07:53:13 +02:00
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.