From 39b33072941f8bab82aa2c802044062385a046bf Mon Sep 17 00:00:00 2001 From: Alexandre Ghiti Date: Wed, 29 Mar 2023 06:53:26 +0200 Subject: [PATCH] riscv: Introduce CONFIG_RELOCATABLE This config allows to compile 64b kernel as PIE and to relocate it at any virtual address at runtime: this paves the way to KASLR. Runtime relocation is possible since relocation metadata are embedded into the kernel. Note that relocating at runtime introduces an overhead even if the kernel is loaded at the same address it was linked at and that the compiler options are those used in arm64 which uses the same RELA relocation format. Signed-off-by: Alexandre Ghiti Link: https://lore.kernel.org/r/20230329045329.64565-4-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt --- arch/riscv/Kconfig | 14 +++++++++++ arch/riscv/Makefile | 7 ++++-- arch/riscv/kernel/vmlinux.lds.S | 17 +++++++++++-- arch/riscv/mm/Makefile | 4 +++ arch/riscv/mm/init.c | 54 ++++++++++++++++++++++++++++++++++++++++- 5 files changed, 91 insertions(+), 5 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index c5e42cc..ccbb051 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -561,6 +561,20 @@ config COMPAT If you want to execute 32-bit userspace applications, say Y. +config RELOCATABLE + bool "Build a relocatable kernel" + depends on MMU && 64BIT && !XIP_KERNEL + help + This builds a kernel as a Position Independent Executable (PIE), + which retains all relocation metadata required to relocate the + kernel binary at runtime to a different virtual address than the + address it was linked at. + Since RISCV uses the RELA relocation format, this requires a + relocation pass at runtime even if the kernel is loaded at the + same address it was linked at. + + If unsure, say N. + endmenu # "Kernel features" menu "Boot options" diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index 6203c33..860b09e 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -7,9 +7,12 @@ # OBJCOPYFLAGS := -O binary -LDFLAGS_vmlinux := +ifeq ($(CONFIG_RELOCATABLE),y) + LDFLAGS_vmlinux += -shared -Bsymbolic -z notext -z norelro + KBUILD_CFLAGS += -fPIE +endif ifeq ($(CONFIG_DYNAMIC_FTRACE),y) - LDFLAGS_vmlinux := --no-relax + LDFLAGS_vmlinux += --no-relax KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY ifeq ($(CONFIG_RISCV_ISA_C),y) CC_FLAGS_FTRACE := -fpatchable-function-entry=4 diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S index e05e6df..615ff58 100644 --- a/arch/riscv/kernel/vmlinux.lds.S +++ b/arch/riscv/kernel/vmlinux.lds.S @@ -122,10 +122,23 @@ SECTIONS *(.sdata*) } - .rela.dyn : { - *(.rela*) + .rela.dyn : ALIGN(8) { + __rela_dyn_start = .; + *(.rela .rela*) + __rela_dyn_end = .; } +#ifdef CONFIG_RELOCATABLE + .data.rel : { *(.data.rel*) } + .got : { *(.got*) } + .plt : { *(.plt) } + .dynamic : { *(.dynamic) } + .dynsym : { *(.dynsym) } + .dynstr : { *(.dynstr) } + .hash : { *(.hash) } + .gnu.hash : { *(.gnu.hash) } +#endif + #ifdef CONFIG_EFI .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } __pecoff_data_raw_size = ABSOLUTE(. - __pecoff_text_end); diff --git a/arch/riscv/mm/Makefile b/arch/riscv/mm/Makefile index 2ac177c..b85e9e8 100644 --- a/arch/riscv/mm/Makefile +++ b/arch/riscv/mm/Makefile @@ -1,6 +1,10 @@ # SPDX-License-Identifier: GPL-2.0-only CFLAGS_init.o := -mcmodel=medany +ifdef CONFIG_RELOCATABLE +CFLAGS_init.o += -fno-pie +endif + ifdef CONFIG_FTRACE CFLAGS_REMOVE_init.o = $(CC_FLAGS_FTRACE) CFLAGS_REMOVE_cacheflush.o = $(CC_FLAGS_FTRACE) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 478d676..029a844 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -20,6 +20,9 @@ #include #include #include +#ifdef CONFIG_RELOCATABLE +#include +#endif #include #include @@ -146,7 +149,7 @@ static void __init print_vm_layout(void) print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END); #endif - print_ml("kernel", (unsigned long)KERNEL_LINK_ADDR, + print_ml("kernel", (unsigned long)kernel_map.virt_addr, (unsigned long)ADDRESS_SPACE_END); } } @@ -820,6 +823,44 @@ retry: #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." #endif +#ifdef CONFIG_RELOCATABLE +extern unsigned long __rela_dyn_start, __rela_dyn_end; + +static void __init relocate_kernel(void) +{ + Elf64_Rela *rela = (Elf64_Rela *)&__rela_dyn_start; + /* + * This holds the offset between the linked virtual address and the + * relocated virtual address. + */ + uintptr_t reloc_offset = kernel_map.virt_addr - KERNEL_LINK_ADDR; + /* + * This holds the offset between kernel linked virtual address and + * physical address. + */ + uintptr_t va_kernel_link_pa_offset = KERNEL_LINK_ADDR - kernel_map.phys_addr; + + for ( ; rela < (Elf64_Rela *)&__rela_dyn_end; rela++) { + Elf64_Addr addr = (rela->r_offset - va_kernel_link_pa_offset); + Elf64_Addr relocated_addr = rela->r_addend; + + if (rela->r_info != R_RISCV_RELATIVE) + continue; + + /* + * Make sure to not relocate vdso symbols like rt_sigreturn + * which are linked from the address 0 in vmlinux since + * vdso symbol addresses are actually used as an offset from + * mm->context.vdso in VDSO_OFFSET macro. + */ + if (relocated_addr >= KERNEL_LINK_ADDR) + relocated_addr += reloc_offset; + + *(Elf64_Addr *)addr = relocated_addr; + } +} +#endif /* CONFIG_RELOCATABLE */ + #ifdef CONFIG_XIP_KERNEL static void __init create_kernel_page_table(pgd_t *pgdir, __always_unused bool early) @@ -1007,6 +1048,17 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa) BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K); #endif +#ifdef CONFIG_RELOCATABLE + /* + * Early page table uses only one PUD, which makes it possible + * to map PUD_SIZE aligned on PUD_SIZE: if the relocation offset + * makes the kernel cross over a PUD_SIZE boundary, raise a bug + * since a part of the kernel would not get mapped. + */ + BUG_ON(PUD_SIZE - (kernel_map.virt_addr & (PUD_SIZE - 1)) < kernel_map.size); + relocate_kernel(); +#endif + apply_early_boot_alternatives(); pt_ops_set_early(); -- 2.7.4