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v5.19
linux/arch/x86
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Thadeu Lima de Souza Cascardo 571c30b1a8 x86/bugs: Do not enable IBPB at firmware entry when IBPB is not available 
Some cloud hypervisors do not provide IBPB on very recent CPU processors,
including AMD processors affected by Retbleed.

Using IBPB before firmware calls on such systems would cause a GPF at boot
like the one below. Do not enable such calls when IBPB support is not
present.

  EFI Variables Facility v0.08 2004-May-17
  general protection fault, maybe for address 0x1: 0000 [#1] PREEMPT SMP NOPTI
  CPU: 0 PID: 24 Comm: kworker/u2:1 Not tainted 5.19.0-rc8+ #7
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015
  Workqueue: efi_rts_wq efi_call_rts
  RIP: 0010:efi_call_rts
  Code: e8 37 33 58 ff 41 bf 48 00 00 00 49 89 c0 44 89 f9 48 83 c8 01 4c 89 c2 48 c1 ea 20 66 90 b9 49 00 00 00 b8 01 00 00 00 31 d2 <0f> 30 e8 7b 9f 5d ff e8 f6 f8 ff ff 4c 89 f1 4c 89 ea 4c 89 e6 48
  RSP: 0018:ffffb373800d7e38 EFLAGS: 00010246
  RAX: 0000000000000001 RBX: 0000000000000006 RCX: 0000000000000049
  RDX: 0000000000000000 RSI: ffff94fbc19d8fe0 RDI: ffff94fbc1b2b300
  RBP: ffffb373800d7e70 R08: 0000000000000000 R09: 0000000000000000
  R10: 000000000000000b R11: 000000000000000b R12: ffffb3738001fd78
  R13: ffff94fbc2fcfc00 R14: ffffb3738001fd80 R15: 0000000000000048
  FS:  0000000000000000(0000) GS:ffff94fc3da00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: ffff94fc30201000 CR3: 000000006f610000 CR4: 00000000000406f0
  Call Trace:
   <TASK>
   ? __wake_up
   process_one_work
   worker_thread
   ? rescuer_thread
   kthread
   ? kthread_complete_and_exit
   ret_from_fork
   </TASK>
  Modules linked in:

Fixes: 28a99e95f5 ("x86/amd: Use IBPB for firmware calls")
Reported-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20220728122602.2500509-1-cascardo@canonical.com
2022-07-29 10:02:35 +02:00
..
boot x86/compressed/64: Add identity mappings for setup_data entries 2022-07-06 11:23:39 +02:00
coco x86/tdx: Handle load_unaligned_zeropad() page-cross to a shared page 2022-06-17 15:37:33 -07:00
configs x86/config: Make the x86 defconfigs a bit more usable 2022-03-27 20:58:35 +02:00
crypto crypto: x86 - eliminate anonymous module_init & module_exit 2022-04-08 16:13:31 +08:00
entry x86/entry: Remove UNTRAIN_RET from native_irq_return_ldt 2022-07-14 09:45:12 +02:00
events perf/x86/intel/lbr: Fix unchecked MSR access error on HSW 2022-07-20 19:24:55 +02:00
hyperv x86/Hyper-V: Add SEV negotiate protocol support in Isolation VM 2022-06-15 18:27:40 +00:00
ia32 x86: Remove a.out support 2022-04-11 18:04:27 +02:00
include Revert "x86/sev: Expose sev_es_ghcb_hv_call() for use by HyperV" 2022-07-27 18:09:13 +02:00
kernel x86/bugs: Do not enable IBPB at firmware entry when IBPB is not available 2022-07-29 10:02:35 +02:00
kvm KVM: x86: Protect the unused bits in MSR exiting flags 2022-07-19 14:04:18 -04:00
lib x86/retbleed: Add fine grained Kconfig knobs 2022-06-29 17:43:41 +02:00
math-emu x86/32: Remove lazy GS macros 2022-04-14 14:09:43 +02:00
mm x86/pat: Fix x86_has_pat_wp() 2022-07-13 12:44:04 +02:00
net x86/bpf: Use alternative RET encoding 2022-06-27 10:33:58 +02:00
pci x86/PCI: Revert "x86/PCI: Clip only host bridge windows for E820 regions" 2022-06-17 14:24:14 -05:00
platform efi/x86: use naked RET on mixed mode call wrapper 2022-07-16 09:51:24 -07:00
power x86/cpu: Load microcode during restore_processor_state() 2022-04-19 19:37:05 +02:00
purgatory x86/purgatory: Remove -nostdlib compiler flag 2021-12-30 14:13:06 +01:00
ras
realmode Intel Trust Domain Extensions 2022-05-23 17:51:12 -07:00
tools x86/build: Use the proper name CONFIG_FW_LOADER 2021-12-29 22:20:38 +01:00
um um: Fix out-of-bounds read in LDT setup 2022-05-27 09:03:41 +02:00
video
virt/vmx/tdx x86/tdx: Provide common base for SEAMCALL and TDCALL C wrappers 2022-04-07 08:27:50 -07:00
xen Just when you thought that all the speculation bugs were addressed and 2022-07-11 18:15:25 -07:00
.gitignore
Kbuild x86/cc: Move arch/x86/{kernel/cc_platform.c => coco/core.c} 2022-02-23 18:25:58 +01:00
Kconfig - Make retbleed mitigations 64-bit only (32-bit will need a bit more 2022-07-24 09:40:17 -07:00
Kconfig.assembler
Kconfig.cpu x86/mmx_32: Remove X86_USE_3DNOW 2021-12-11 09:09:45 +01:00
Kconfig.debug x86/Kconfig: Fix indentation of arch/x86/Kconfig.debug 2022-05-25 15:39:27 +02:00
Makefile lkdtm: Disable return thunks in rodata.c 2022-07-20 19:24:53 +02:00
Makefile_32.cpu x86/build: Do not add -falign flags unconditionally for clang 2021-09-19 10:35:53 +09:00
Makefile.um um: allow not setting extra rpaths in the linux binary 2021-06-17 21:54:15 +02:00