Commit ce2eef33 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge
Browse files

xen: rearrange things to fix stackprotector 



Make sure the stack-protector segment registers are properly set up
before calling any functions which may have stack-protection compiled
into them.

[ Impact: prevent Xen early-boot crash when stack-protector is enabled ]
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
parent 5416c266

arch/x86/xen/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -5,6 +5,10 @@ CFLAGS_REMOVE_time.o = -pg 
CFLAGS_REMOVE_irq.o = -pg

endif



# Make sure early boot has no stackprotector

nostackp := $(call cc-option, -fno-stack-protector)

CFLAGS_enlighten.o		:= $(nostackp)



obj-y		:= enlighten.o setup.o multicalls.o mmu.o irq.o \

			time.o xen-asm.o xen-asm_$(BITS).o \

			grant-table.o suspend.o

arch/x86/xen/enlighten.c

+10 −12
Original line number Diff line number Diff line
@@ -925,10 +925,6 @@ asmlinkage void __init xen_start_kernel(void) 


	xen_domain_type = XEN_PV_DOMAIN;



	BUG_ON(memcmp(xen_start_info->magic, "xen-3", 5) != 0);



	xen_setup_features();



	/* Install Xen paravirt ops */

	pv_info = xen_info;

	pv_init_ops = xen_init_ops;
@@ -937,8 +933,15 @@ asmlinkage void __init xen_start_kernel(void) 
	pv_apic_ops = xen_apic_ops;

	pv_mmu_ops = xen_mmu_ops;



	xen_init_irq_ops();

#ifdef CONFIG_X86_64

	/*

	 * Setup percpu state.  We only need to do this for 64-bit

	 * because 32-bit already has %fs set properly.

	 */

	load_percpu_segment(0);

#endif



	xen_init_irq_ops();

	xen_init_cpuid_mask();



#ifdef CONFIG_X86_LOCAL_APIC
@@ -948,6 +951,8 @@ asmlinkage void __init xen_start_kernel(void) 
	set_xen_basic_apic_ops();

#endif



	xen_setup_features();



	if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) {

		pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start;

		pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit;
@@ -955,13 +960,6 @@ asmlinkage void __init xen_start_kernel(void) 


	machine_ops = xen_machine_ops;



#ifdef CONFIG_X86_64

	/*

	 * Setup percpu state.  We only need to do this for 64-bit

	 * because 32-bit already has %fs set properly.

	 */

	load_percpu_segment(0);

#endif

	/*

	 * The only reliable way to retain the initial address of the

	 * percpu gdt_page is to remember it here, so we can go and

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