linux/tools
Linus Torvalds bf98bae3d8 - Use LEA ...%rsp instead of ADD %rsp in the Zen1/2 SRSO return sequence
as latter clobbers flags which interferes with fastop emulation in
   KVM, leading to guests freezing during boot
 
 - A fix for the DIV(0) quotient data leak on Zen1 to clear the divider
   buffers at the right time
 
 - Disable the SRSO mitigation on unaffected configurations as it got
   enabled there unnecessarily
 
 - Change .text section name to fix CONFIG_LTO_CLANG builds
 
 - Improve the optprobe indirect jmp check so that certain configurations
   can still be able to use optprobes at all
 
 - A serious and good scrubbing of the untraining routines by PeterZ:
  - Add proper speculation stopping traps so that objtool is happy
  - Adjust objtool to handle the new thunks
  - Make the thunk pointer assignable to the different untraining
    sequences at runtime, thus avoiding the alternative at the return
    thunk. It simplifies the code a bit too.
  - Add a entry_untrain_ret() main entry point which selects the
    respective untraining sequence
  - Rename things so that they're more clear
  - Fix stack validation with FRAME_POINTER=y builds
 
 - Fix static call patching to handle when a JMP to the return thunk is
   the last insn on the very last module memory page
 
 - Add more documentation about what each untraining routine does and
   why
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Merge tag 'x86_urgent_for_v6.5_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Borislav Petkov:
 "Extraordinary embargoed times call for extraordinary measures. That's
  why this week's x86/urgent branch is larger than usual, containing all
  the known fallout fixes after the SRSO mitigation got merged.

  I know, it is a bit late in the game but everyone who has reported a
  bug stemming from the SRSO pile, has tested that branch and has
  confirmed that it fixes their bug.

  Also, I've run it on every possible hardware I have and it is looking
  good. It is running on this very machine while I'm typing, for 2 days
  now without an issue. Famous last words...

   - Use LEA ...%rsp instead of ADD %rsp in the Zen1/2 SRSO return
     sequence as latter clobbers flags which interferes with fastop
     emulation in KVM, leading to guests freezing during boot

   - A fix for the DIV(0) quotient data leak on Zen1 to clear the
     divider buffers at the right time

   - Disable the SRSO mitigation on unaffected configurations as it got
     enabled there unnecessarily

   - Change .text section name to fix CONFIG_LTO_CLANG builds

   - Improve the optprobe indirect jmp check so that certain
     configurations can still be able to use optprobes at all

   - A serious and good scrubbing of the untraining routines by PeterZ:
      - Add proper speculation stopping traps so that objtool is happy
      - Adjust objtool to handle the new thunks
      - Make the thunk pointer assignable to the different untraining
        sequences at runtime, thus avoiding the alternative at the
        return thunk. It simplifies the code a bit too.
      - Add a entry_untrain_ret() main entry point which selects the
        respective untraining sequence
      - Rename things so that they're more clear
      - Fix stack validation with FRAME_POINTER=y builds

   - Fix static call patching to handle when a JMP to the return thunk
     is the last insn on the very last module memory page

   - Add more documentation about what each untraining routine does and
     why"

* tag 'x86_urgent_for_v6.5_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/srso: Correct the mitigation status when SMT is disabled
  x86/static_call: Fix __static_call_fixup()
  objtool/x86: Fixup frame-pointer vs rethunk
  x86/srso: Explain the untraining sequences a bit more
  x86/cpu/kvm: Provide UNTRAIN_RET_VM
  x86/cpu: Cleanup the untrain mess
  x86/cpu: Rename srso_(.*)_alias to srso_alias_\1
  x86/cpu: Rename original retbleed methods
  x86/cpu: Clean up SRSO return thunk mess
  x86/alternative: Make custom return thunk unconditional
  objtool/x86: Fix SRSO mess
  x86/cpu: Fix up srso_safe_ret() and __x86_return_thunk()
  x86/cpu: Fix __x86_return_thunk symbol type
  x86/retpoline,kprobes: Skip optprobe check for indirect jumps with retpolines and IBT
  x86/retpoline,kprobes: Fix position of thunk sections with CONFIG_LTO_CLANG
  x86/srso: Disable the mitigation on unaffected configurations
  x86/CPU/AMD: Fix the DIV(0) initial fix attempt
  x86/retpoline: Don't clobber RFLAGS during srso_safe_ret()
2023-08-19 10:46:02 +02:00
..
accounting
arch asm-generic: regression fix for 6.5 2023-08-18 18:13:36 +02:00
bootconfig
bpf
build perf build: Fix broken feature check for libtracefs due to external lib changes 2023-07-11 13:17:05 -03:00
certs
cgroup
counter tools/counter: Makefile: Replace rmdir by rm to avoid make,clean failure 2023-07-24 10:29:52 -04:00
debugging
edid
firewire
firmware
gpio
hv vmbus_testing: fix wrong python syntax for integer value comparison 2023-07-23 23:19:30 +00:00
iio
include tools include UAPI: Sync the sound/asound.h copy with the kernel sources 2023-07-14 10:33:50 -03:00
io_uring
kvm/kvm_stat
laptop
leds
lib libsubcmd: Avoid SEGV/use-after-free when commands aren't excluded 2023-07-11 16:44:12 -03:00
memory-model
mm
net/ynl tools: ynl-gen: fix parse multi-attr enum attribute 2023-07-26 13:38:23 -07:00
objtool objtool/x86: Fixup frame-pointer vs rethunk 2023-08-17 00:44:35 +02:00
pci
pcmcia
perf x86/retpoline,kprobes: Skip optprobe check for indirect jumps with retpolines and IBT 2023-08-14 11:46:51 +02:00
power platform-drivers-x86 for v6.5-1 2023-06-30 14:50:00 -07:00
rcu
scripts
spi
testing Including fixes from ipsec and netfilter. 2023-08-18 06:52:23 +02:00
thermal
time
tracing rtla/timerlat_hist: Add timerlat user-space support 2023-06-13 16:41:14 -04:00
usb
verification
virtio tools/virtio: fix build break for aarch64 2023-06-27 10:47:08 -04:00
wmi
workqueue
Makefile