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linux/arch/x86/xen
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Jason Andryuk e7b00dc282 x86/xen: Delay get_cpu_cap until stack canary is established 
commit 36104cb901 upstream.

Commit 2cc42bac1c ("x86-64/Xen: eliminate W+X mappings") introduced a
call to get_cpu_cap, which is fstack-protected.  This is works on x86-64
as commit 4f277295e5 ("x86/xen: init %gs very early to avoid page
faults with stack protector") ensures the stack protector is configured,
but it it did not cover x86-32.

Delay calling get_cpu_cap until after xen_setup_gdt has initialized the
stack canary.  Without this, a 32bit PV machine crashes early
in boot.
(XEN) Domain 0 (vcpu#0) crashed on cpu#0:
(XEN) ----[ Xen-4.6.6-xc  x86_64  debug=n  Tainted:    C ]----
(XEN) CPU:    0
(XEN) RIP:    e019:[<00000000c10362f8>]

And the PV kernel IP corresponds to init_scattered_cpuid_features
   0xc10362f8 <+24>:    mov    %gs:0x14,%eax

Fixes 2cc42bac1c ("x86-64/Xen: eliminate W+X mappings")

Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2018-04-24 09:36:25 +02:00
..
apic.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
debugfs.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
debugfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
efi.c x86/xen/efi: Initialize only the EFI struct members used by Xen 2017-06-23 11:11:03 +02:00
enlighten.c xen/balloon: Mark unallocated host memory as UNUSABLE 2018-03-03 10:24:28 +01:00
enlighten_hvm.c x86/virt: Add enum for hypervisors to replace x86_hyper 2017-12-25 14:26:20 +01:00
enlighten_pv.c x86/xen: Delay get_cpu_cap until stack canary is established 2018-04-24 09:36:25 +02:00
enlighten_pvh.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
grant-table.c xen/grant-table: Use kmalloc_array() in arch_gnttab_valloc() 2016-08-26 10:44:22 +01:00
irq.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mmu.c xen/mmu: set MMU_NORMAL_PT_UPDATE in remap_area_mfn_pte_fn 2017-08-31 09:45:55 -04:00
mmu.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mmu_hvm.c x86/gart: Exclude GART aperture from vmcore 2018-04-12 12:32:20 +02:00
mmu_pv.c x86-64/Xen: eliminate W+X mappings 2018-03-03 10:24:26 +01:00
multicalls.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
multicalls.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
p2m.c xen: Fix {set,clear}_foreign_p2m_mapping on autotranslating guests 2018-02-22 15:42:28 +01:00
pci-swiotlb-xen.c xen-swiotlb: consolidate xen_swiotlb_dma_ops 2017-06-20 11:12:59 +02:00
platform-pci-unplug.c xen/pvh: PVH guests always have PV devices 2017-02-07 08:07:01 -05:00
pmu.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pmu.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
setup.c xen/balloon: Mark unallocated host memory as UNUSABLE 2018-03-03 10:24:28 +01:00
smp.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smp_hvm.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smp_pv.c x86/xen/64, x86/entry/64: Clean up SP code in cpu_initialize_context() 2017-12-25 14:26:18 +01:00
spinlock.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
suspend.c x86/xen: Zero MSR_IA32_SPEC_CTRL before suspend 2018-03-08 22:41:06 -08:00
suspend_hvm.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
suspend_pv.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
time.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vdso.h i386: move xen 2007-10-11 11:16:51 +02:00
vga.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xen-asm.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xen-asm_32.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xen-asm_64.S x86/xen: Support early interrupts in xen pv guests 2018-02-03 17:39:17 +01:00
xen-head.S x86/xen: init %gs very early to avoid page faults with stack protector 2018-02-22 15:42:18 +01:00
xen-ops.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xen-pvh.S x86/boot/64: Rename init_level4_pgt and early_level4_pgt 2017-06-13 08:56:55 +02:00