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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: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Jeremy Fitzhardinge 2009-08-17 12:26:53 -07:00
parent 5416c26635
commit ce2eef33d3
2 changed files with 14 additions and 12 deletions
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4
arch/x86/xen/Makefile
View File

@ -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

22
arch/x86/xen/enlighten.c
View File

@ -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