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hv: build hypervisor as PIE (position-independent executable)

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Build and link hypervisor with "-pie" and remove static linking so that
it generates .rela sections for relocation

Signed-off-by: Zheng Gen <gen.zheng@intel.com>
Signed-off-by: Zide Chen <zide.chen@intel.com>
Reviewed-by: Yin fengwei <fengwei.yin@intel.com>
This commit is contained in:
Zide Chen 2018-06-22 10:25:24 -07:00 committed by lijinxia
parent 92cd2612fc
commit 84d9da1d6a
3 changed files with 17 additions and 2 deletions
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10
hypervisor/Makefile
View File

@ -42,6 +42,7 @@ CFLAGS += -mno-red-zone
CFLAGS += -static -nostdinc -nostdlib -fno-common CFLAGS += -static -nostdinc -nostdlib -fno-common
CFLAGS += -O2 -D_FORTIFY_SOURCE=2 CFLAGS += -O2 -D_FORTIFY_SOURCE=2
CFLAGS += -Wformat -Wformat-security CFLAGS += -Wformat -Wformat-security
CFLAGS += -fpie
ifdef STACK_PROTECTOR ifdef STACK_PROTECTOR
ifeq (true, $(shell [ $(GCC_MAJOR) -gt 4 ] && echo true)) ifeq (true, $(shell [ $(GCC_MAJOR) -gt 4 ] && echo true))
@ -58,10 +59,17 @@ endif
ASFLAGS += -m64 -nostdinc -nostdlib ASFLAGS += -m64 -nostdinc -nostdlib
LDFLAGS += -Wl,--gc-sections -static -nostartfiles -nostdlib LDFLAGS += -Wl,--gc-sections -nostartfiles -nostdlib
LDFLAGS += -Wl,-n,-z,max-page-size=0x1000 LDFLAGS += -Wl,-n,-z,max-page-size=0x1000
LDFLAGS += -Wl,-z,noexecstack LDFLAGS += -Wl,-z,noexecstack
# on X86_64, when build with "-pie", GCC fails on linking R_X86_64_32
# relocations with "recompile with fPIC" error, because it may cause
# run-time relocation overflow if it runs at address above 4GB.
# We know it's safe because Hypervisor runs under 4GB. "noreloc-overflow"
# is used to avoid the compile error
LDFLAGS += -pie -z noreloc-overflow
ARCH_CFLAGS += -gdwarf-2 ARCH_CFLAGS += -gdwarf-2
ARCH_ASFLAGS += -gdwarf-2 -DASSEMBLER=1 ARCH_ASFLAGS += -gdwarf-2 -DASSEMBLER=1
ARCH_ARFLAGS += ARCH_ARFLAGS +=

2
hypervisor/arch/x86/cpu_primary.S
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@ -136,7 +136,7 @@ primary_start_long_mode:
* Notes: this includes the fixup to IDT tables and temporary * Notes: this includes the fixup to IDT tables and temporary
* page tables * page tables
*/ */
/*call _relocate*/ call _relocate
/* Load temportary GDT pointer value */ /* Load temportary GDT pointer value */
lea cpu_primary32_gdt_ptr(%rip), %rbx lea cpu_primary32_gdt_ptr(%rip), %rbx

7
hypervisor/bsp/ld/link_ram.ld.in
View File

@ -39,6 +39,13 @@ SECTIONS
} > ram } > ram
.rela :
{
*(.rela*)
*(.dyn*)
} > ram
. = ALIGN(4) ;
_ld_trampoline_load = .; _ld_trampoline_load = .;
.trampoline : AT (_ld_trampoline_load) .trampoline : AT (_ld_trampoline_load)