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2dc0572f2c
linux-next/arch/x86
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Kan Liang 2dc0572f2c perf/x86/intel: Fix unchecked MSR access error caused by VLBR_EVENT 
On a Haswell machine, the perf_fuzzer managed to trigger this message:

[117248.075892] unchecked MSR access error: WRMSR to 0x3f1 (tried to
write 0x0400000000000000) at rIP: 0xffffffff8106e4f4
(native_write_msr+0x4/0x20)
[117248.089957] Call Trace:
[117248.092685]  intel_pmu_pebs_enable_all+0x31/0x40
[117248.097737]  intel_pmu_enable_all+0xa/0x10
[117248.102210]  __perf_event_task_sched_in+0x2df/0x2f0
[117248.107511]  finish_task_switch.isra.0+0x15f/0x280
[117248.112765]  schedule_tail+0xc/0x40
[117248.116562]  ret_from_fork+0x8/0x30

A fake event called VLBR_EVENT may use the bit 58 of the PEBS_ENABLE, if
the precise_ip is set. The bit 58 is reserved by the HW. Accessing the
bit causes the unchecked MSR access error.

The fake event doesn't support PEBS. The case should be rejected.

Fixes: 097e4311cd ("perf/x86: Add constraint to create guest LBR event without hw counter")
Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/1615555298-140216-2-git-send-email-kan.liang@linux.intel.com
2021-03-16 21:44:39 +01:00
..
boot EFI updates collected by Ard Biesheuvel: 2020-12-24 12:40:07 -08:00
configs module: remove EXPORT_UNUSED_SYMBOL* 2021-02-08 12:28:07 +01:00
crypto crypto: aesni - release FPU during skcipher walk API calls 2021-01-22 14:58:04 +11:00
entry x86/sev-es: Introduce ip_within_syscall_gap() helper 2021-03-08 14:22:17 +01:00
events perf/x86/intel: Fix unchecked MSR access error caused by VLBR_EVENT 2021-03-16 21:44:39 +01:00
hyperv iommu/hyperv: setup an IO-APIC IRQ remapping domain for root partition 2021-02-11 08:47:07 +00:00
ia32 x86/ia32_signal: Propagate __user annotation properly 2020-12-11 19:44:31 +01:00
include A single objtool fix to handle the PUSHF/POPF validation correctly for the 2021-03-14 13:15:55 -07:00
kernel - A couple of SEV-ES fixes and robustifications: verify usermode stack 2021-03-14 12:48:10 -07:00
kvm - Make sure PMU internal buffers are flushed for per-CPU events too and 2021-03-14 12:57:17 -07:00
lib x86/sev-es: Use __copy_from_user_inatomic() 2021-03-09 12:37:54 +01:00
math-emu treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
mm x86: fix seq_file iteration for pat/memtype.c 2021-02-26 09:41:05 -08:00
net bpf, x86: Fix BPF_FETCH atomic and/or/xor with r0 as src 2021-02-22 18:03:11 +01:00
pci Simple Firmware Interface (SFI) support removal for v5.12-rc1 2021-02-24 10:35:29 -08:00
platform Simple Firmware Interface (SFI) support removal for v5.12-rc1 2021-02-24 10:35:29 -08:00
power clang-lto for v5.12-rc1 (part2) 2021-02-23 15:13:45 -08:00
purgatory crypto: sha - split sha.h into sha1.h and sha2.h 2020-11-20 14:45:33 +11:00
ras treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
realmode x86/head/64: Don't call verify_cpu() on starting APs 2020-09-09 11:33:20 +02:00
tools Modules updates for v5.12 2021-02-23 10:15:33 -08:00
um um: remove process stub VMA 2021-02-12 21:37:38 +01:00
video
xen xen: branch for v5.12-rc3 2021-03-12 11:34:36 -08:00
.gitignore
Kbuild
Kconfig x86, kfence: enable KFENCE for x86 2021-02-26 09:41:02 -08:00
Kconfig.assembler
Kconfig.cpu treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Kconfig.debug x86, libnvdimm/test: Remove COPY_MC_TEST 2020-10-26 18:08:35 +01:00
Makefile clang-lto for v5.12-rc1 (part2) 2021-02-23 15:13:45 -08:00
Makefile_32.cpu
Makefile.um