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linux/arch/x86/kernel/cpu
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Daniel Vetter dc9b7be557 x86/sgx: Drop racy follow_pfn() check 
PTE insertion is fundamentally racy, and this check doesn't do anything
useful. Quoting Sean:

  "Yeah, it can be whacked. The original, never-upstreamed code asserted
  that the resolved PFN matched the PFN being installed by the fault
  handler as a sanity check on the SGX driver's EPC management. The
  WARN assertion got dropped for whatever reason, leaving that useless
  chunk."

Jason stumbled over this as a new user of follow_pfn(), and I'm trying
to get rid of unsafe callers of that function so it can be locked down
further.

This is independent prep work for the referenced patch series:

  https://lore.kernel.org/dri-devel/20201127164131.2244124-1-daniel.vetter@ffwll.ch/

Fixes: 947c6e11fa43 ("x86/sgx: Add ptrace() support for the SGX driver")
Reported-by: Jason Gunthorpe <jgg@ziepe.ca>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lkml.kernel.org/r/20210204184519.2809313-1-daniel.vetter@ffwll.ch
2021-02-05 10:45:11 +01:00
..
mce
A set of updates for entry/exit handling:
2020-12-14 17:13:53 -08:00
microcode
- A single cleanup removing "break" after a return statement (Tom Rix)
2020-12-14 13:13:15 -08:00
mtrr
x86/mtrr: Correct the range check before performing MTRR type lookups
2021-01-06 13:01:13 +01:00
resctrl
x86/resctrl: Don't move a task to the same resource group
2021-01-08 09:08:03 +01:00
sgx
x86/sgx: Drop racy follow_pfn() check
2021-02-05 10:45:11 +01:00
.gitignore
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
acrn.c
x86/acrn: Remove redundant chars from ACRN signature
2020-08-07 01:32:00 +02:00
amd.c
x86/cpu/amd: Remove dead code for TSEG region remapping
2020-12-08 18:45:21 +01:00
aperfmperf.c
x86/cpu: Avoid cpuinfo-induced IPIing of idle CPUs
2020-11-06 16:59:11 -08:00
bugs.c
x86/speculation: Fix prctl() when spectre_v2_user={seccomp,prctl},ibpb
2020-11-25 20:17:09 +01:00
cacheinfo.c
x86/CPU/AMD: Remove amd_get_nb_id()
2020-11-19 11:43:17 +01:00
centaur.c
x86/cpu/centaur: Add Centaur family >=7 CPUs initialization support
2020-09-11 10:53:19 +02:00
common.c
This feature enhances the current guest memory encryption support
2020-10-14 10:21:34 -07:00
cpu.h
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
cpuid-deps.c
x86: Enumerate AVX512 FP16 CPUID feature flag
2020-12-11 19:00:58 -05:00
cyrix.c
x86/cpu/cyrix: Use correct macros for Cyrix calls on Geode processors
2019-03-21 12:28:50 +01:00
feat_ctl.c
x86/cpu/intel: Add a nosgx kernel parameter
2020-11-17 14:36:13 +01:00
hygon.c
x86/cpu/amd: Remove dead code for TSEG region remapping
2020-12-08 18:45:21 +01:00
hypervisor.c
x86/paravirt: Remove const mark from x86_hyper_xen_hvm variable
2019-07-17 08:09:59 +02:00
intel_epb.c
x86: intel_epb: Do not build when CONFIG_PM is unset
2019-05-30 10:58:36 +02:00
intel_pconfig.c
x86/pconfig: Detect PCONFIG targets
2018-03-12 12:10:54 +01:00
intel.c
A set of locking fixes and updates:
2020-08-10 19:07:44 -07:00
Makefile
x86/sgx: Initialize metadata for Enclave Page Cache (EPC) sections
2020-11-17 14:36:13 +01:00
match.c
x86/cpu: Add a steppings field to struct x86_cpu_id
2020-04-20 12:19:21 +02:00
mkcapflags.sh
x86/cpu: Print VMX flags in /proc/cpuinfo using VMX_FEATURES_*
2020-01-13 18:36:02 +01:00
mshyperv.c
x86/hyperv: Enable 15-bit APIC ID if the hypervisor supports it
2020-11-04 11:10:52 +01:00
perfctr-watchdog.c
x86/perf: Add hardware performance events support for Zhaoxin CPU.
2020-04-30 20:14:35 +02:00
powerflags.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
proc.c
x86/cpu: Print VMX flags in /proc/cpuinfo using VMX_FEATURES_*
2020-01-13 18:36:02 +01:00
rdrand.c
x86/rdrand: Sanity-check RDRAND output
2019-10-01 19:55:32 +02:00
scattered.c
x86/cpu: Add VM page flush MSR availablility as a CPUID feature
2020-12-14 11:09:30 -05:00
topology.c
x86/topology: Set cpu_die_id only if DIE_TYPE found
2020-11-19 11:43:25 +01:00
transmeta.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
tsx.c
Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-01-28 12:46:42 -08:00
umc.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
umwait.c
KVM: VMX: Stop context switching MSR_IA32_UMWAIT_CONTROL
2020-06-22 20:54:57 -04:00
vmware.c
KVM: SVM: Add GHCB accessor functions for retrieving fields
2020-12-14 11:09:32 -05:00
zhaoxin.c
x86/cpu: Reinitialize IA32_FEAT_CTL MSR on BSP during wakeup
2020-06-15 14:18:37 +02:00