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Merge tag 'lsk-v4.4-arm64-v4.8-kaslr-updates' of git://git.linaro.org/people/ard.biesheuvel/linux-arm into v4.4/topic/mm-kaslr

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This commit is contained in:
Alex Shi
2016-08-15 17:42:55 +08:00
parent 3d27bcb804 f56fa8cba1
commit 21a48ffe4d
3 changed files with 6 additions and 30 deletions
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2
arch/arm64/Makefile
View File

@@ -16,7 +16,7 @@ OBJCOPYFLAGS :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
GZFLAGS :=-9
ifneq ($(CONFIG_RELOCATABLE),)
LDFLAGS_vmlinux += -pie
LDFLAGS_vmlinux += -pie -Bsymbolic
endif
KBUILD_DEFCONFIG := defconfig

21
arch/arm64/kernel/head.S
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@@ -717,40 +717,25 @@ __primary_switch:
* Iterate over each entry in the relocation table, and apply the
* relocations in place.
*/
ldr w8, =__dynsym_offset // offset to symbol table
ldr w9, =__rela_offset // offset to reloc table
ldr w10, =__rela_size // size of reloc table
mov_q x11, KIMAGE_VADDR // default virtual offset
add x11, x11, x23 // actual virtual offset
add x8, x8, x11 // __va(.dynsym)
add x9, x9, x11 // __va(.rela)
add x10, x9, x10 // __va(.rela) + sizeof(.rela)
0: cmp x9, x10
b.hs 2f
b.hs 1f
ldp x11, x12, [x9], #24
ldr x13, [x9, #-8]
cmp w12, #R_AARCH64_RELATIVE
b.ne 1f
b.ne 0b
add x13, x13, x23 // relocate
str x13, [x11, x23]
b 0b
1: cmp w12, #R_AARCH64_ABS64
b.ne 0b
add x12, x12, x12, lsl #1 // symtab offset: 24x top word
add x12, x8, x12, lsr #(32 - 3) // ... shifted into bottom word
ldrsh w14, [x12, #6] // Elf64_Sym::st_shndx
ldr x15, [x12, #8] // Elf64_Sym::st_value
cmp w14, #-0xf // SHN_ABS (0xfff1) ?
add x14, x15, x23 // relocate
csel x15, x14, x15, ne
add x15, x13, x15
str x15, [x11, x23]
b 0b
2:
1:
#endif
ldr x8, =__primary_switched
br x8

13
arch/arm64/kernel/vmlinux.lds.S
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@@ -93,6 +93,7 @@ SECTIONS
*(.discard)
*(.discard.*)
*(.interp .dynamic)
*(.dynsym .dynstr .hash)
}
. = KIMAGE_VADDR + TEXT_OFFSET;
@@ -158,19 +159,9 @@ SECTIONS
.rela : ALIGN(8) {
*(.rela .rela*)
}
.dynsym : ALIGN(8) {
*(.dynsym)
}
.dynstr : {
*(.dynstr)
}
.hash : {
*(.hash)
}
__rela_offset = ADDR(.rela) - KIMAGE_VADDR;
__rela_offset = ABSOLUTE(ADDR(.rela) - KIMAGE_VADDR);
__rela_size = SIZEOF(.rela);
__dynsym_offset = ADDR(.dynsym) - KIMAGE_VADDR;
. = ALIGN(SEGMENT_ALIGN);
__init_end = .;