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grub/util/grub-module-verifier.c
Alexander Graf 893ed83b2e RISC-V: Add awareness for RISC-V reloations 
This patch adds awareness of RISC-V relocations throughout the grub tools
as well as dynamic linkage and elf->PE relocation conversion support.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
2020-09-21 16:43:54 -04:00

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#include <stdio.h>
#include <string.h>
#include <grub/elf.h>
#include <grub/module_verifier.h>
#include <grub/misc.h>
#include <grub/util/misc.h>
struct grub_module_verifier_arch archs[] = {
{ "i386", 4, 0, EM_386, GRUB_MODULE_VERIFY_SUPPORTS_REL, (int[]){
R_386_32,
R_386_PC32,
-1
} },
{ "x86_64", 8, 0, EM_X86_64, GRUB_MODULE_VERIFY_SUPPORTS_RELA, (int[]){
R_X86_64_64,
R_X86_64_PC64,
/* R_X86_64_32, R_X86_64_32S are supported but shouldn't be used because of their limited range. */
-1
}, (int[]){
R_X86_64_PC32,
R_X86_64_PLT32,
-1
}
},
{ "powerpc", 4, 1, EM_PPC, GRUB_MODULE_VERIFY_SUPPORTS_RELA, (int[]){
GRUB_ELF_R_PPC_ADDR16_LO,
GRUB_ELF_R_PPC_REL24, /* It has limited range but GRUB adds trampolines when necessarry. */
GRUB_ELF_R_PPC_ADDR16_HA,
GRUB_ELF_R_PPC_ADDR32,
GRUB_ELF_R_PPC_REL32,
-1
} },
{ "sparc64", 8, 1, EM_SPARCV9, GRUB_MODULE_VERIFY_SUPPORTS_RELA, (int[]){
R_SPARC_WDISP30, /* It has limited range but GRUB adds trampolines when necessarry. */
R_SPARC_HH22,
R_SPARC_HM10,
R_SPARC_LM22,
R_SPARC_LO10,
R_SPARC_64,
R_SPARC_OLO10,
/* Following 2 relocations have limited range but unfortunately
clang generates them, as it doesn't implement mcmodel=large properly.
At least our heap and core are under 4G, so it's not a problem
usually. */
R_SPARC_HI22,
R_SPARC_32,
-1
} },
{ "ia64", 8, 0, EM_IA_64, GRUB_MODULE_VERIFY_SUPPORTS_RELA, (int[]){
R_IA64_PCREL21B, /* We should verify that it's pointing either
to a function or to a section in the same module.
Checking that external symbol is a function is
non-trivial and I have never seen this relocation used
for anything else, so assume that it always points to a
function.
*/
R_IA64_SEGREL64LSB,
R_IA64_FPTR64LSB,
R_IA64_DIR64LSB,
R_IA64_PCREL64LSB,
R_IA64_LTOFF22X,
R_IA64_LTOFF22,
R_IA64_GPREL64I,
R_IA64_LTOFF_FPTR22,
R_IA64_LDXMOV,
-1
}, (int[]){
R_IA64_GPREL22,
-1
} },
{ "mipsel", 4, 0, EM_MIPS, GRUB_MODULE_VERIFY_SUPPORTS_REL | GRUB_MODULE_VERIFY_SUPPORTS_RELA, (int[]){
R_MIPS_HI16,
R_MIPS_LO16,
R_MIPS_32,
R_MIPS_GPREL32,
R_MIPS_26,
R_MIPS_GOT16,
R_MIPS_CALL16,
R_MIPS_JALR,
-1
} },
{ "mips", 4, 1, EM_MIPS, GRUB_MODULE_VERIFY_SUPPORTS_REL | GRUB_MODULE_VERIFY_SUPPORTS_RELA, (int[]){
R_MIPS_HI16,
R_MIPS_LO16,
R_MIPS_32,
R_MIPS_GPREL32,
R_MIPS_26,
R_MIPS_GOT16,
R_MIPS_CALL16,
R_MIPS_JALR,
-1
} },
{ "arm", 4, 0, EM_ARM, GRUB_MODULE_VERIFY_SUPPORTS_REL, (int[]){
/* Some relocations are range-limited but trampolines are added when necessarry. */
R_ARM_ABS32,
R_ARM_CALL,
R_ARM_JUMP24,
R_ARM_THM_CALL,
R_ARM_THM_JUMP24,
R_ARM_V4BX,
R_ARM_THM_MOVW_ABS_NC,
R_ARM_THM_MOVT_ABS,
R_ARM_THM_JUMP19,
-1
} },
{ "arm64", 8, 0, EM_AARCH64, GRUB_MODULE_VERIFY_SUPPORTS_REL | GRUB_MODULE_VERIFY_SUPPORTS_RELA, (int[]){
R_AARCH64_ABS64,
R_AARCH64_CALL26,
R_AARCH64_JUMP26,
R_AARCH64_ADR_GOT_PAGE,
R_AARCH64_LD64_GOT_LO12_NC,
-1
}, (int[]){
R_AARCH64_ADR_PREL_PG_HI21,
R_AARCH64_ADD_ABS_LO12_NC,
R_AARCH64_LDST64_ABS_LO12_NC,
R_AARCH64_PREL32,
-1
} },
{ "riscv32", 4, 0, EM_RISCV, GRUB_MODULE_VERIFY_SUPPORTS_REL | GRUB_MODULE_VERIFY_SUPPORTS_RELA, (int[]){
R_RISCV_32,
R_RISCV_64,
R_RISCV_ADD8,
R_RISCV_ADD16,
R_RISCV_ADD32,
R_RISCV_ADD64,
R_RISCV_SUB8,
R_RISCV_SUB16,
R_RISCV_SUB32,
R_RISCV_SUB64,
R_RISCV_ALIGN,
R_RISCV_BRANCH,
R_RISCV_CALL,
R_RISCV_CALL_PLT,
R_RISCV_GOT_HI20,
R_RISCV_HI20,
R_RISCV_JAL,
R_RISCV_LO12_I,
R_RISCV_LO12_S,
R_RISCV_PCREL_HI20,
R_RISCV_PCREL_LO12_I,
R_RISCV_PCREL_LO12_S,
R_RISCV_RELAX,
R_RISCV_RVC_BRANCH,
R_RISCV_RVC_JUMP,
-1
} },
{ "riscv64", 8, 0, EM_RISCV, GRUB_MODULE_VERIFY_SUPPORTS_REL | GRUB_MODULE_VERIFY_SUPPORTS_RELA, (int[]){
R_RISCV_32,
R_RISCV_64,
R_RISCV_ADD8,
R_RISCV_ADD16,
R_RISCV_ADD32,
R_RISCV_ADD64,
R_RISCV_SUB8,
R_RISCV_SUB16,
R_RISCV_SUB32,
R_RISCV_SUB64,
R_RISCV_ALIGN,
R_RISCV_BRANCH,
R_RISCV_CALL,
R_RISCV_CALL_PLT,
R_RISCV_GOT_HI20,
R_RISCV_HI20,
R_RISCV_JAL,
R_RISCV_LO12_I,
R_RISCV_LO12_S,
R_RISCV_PCREL_HI20,
R_RISCV_PCREL_LO12_I,
R_RISCV_PCREL_LO12_S,
R_RISCV_RELAX,
R_RISCV_RVC_BRANCH,
R_RISCV_RVC_JUMP,
-1
}
},
};
struct platform_whitelist {
const char *arch;
const char *platform;
const char **whitelist_empty;
};
static struct platform_whitelist whitelists[] = {
{"i386", "xen", (const char *[]) {"all_video", 0}},
{"i386", "xen_pvh", (const char *[]) {"all_video", 0}},
{"x86_64", "xen", (const char *[]) {"all_video", 0}},
{"sparc64", "ieee1275", (const char *[]) {"all_video", 0}},
/* video is compiled-in on MIPS. */
{"mipsel", "loongson", (const char *[]) {"all_video", 0}},
{"mipsel", "qemu_mips", (const char *[]) {"all_video", 0}},
{"mipsel", "arc", (const char *[]) {"all_video", 0}},
{"mips", "qemu_mips", (const char *[]) {"all_video", 0}},
{"mips", "arc", (const char *[]) {"all_video", 0}},
};
int
main (int argc, char **argv)
{
size_t module_size;
unsigned arch, whitelist;
const char **whitelist_empty = 0;
char *module_img;
if (argc != 4) {
fprintf (stderr, "usage: %s FILE ARCH PLATFORM\n", argv[0]);
return 1;
}
for (arch = 0; arch < ARRAY_SIZE(archs); arch++)
if (strcmp(archs[arch].name, argv[2]) == 0)
break;
if (arch == ARRAY_SIZE(archs))
grub_util_error("%s: unknown arch: %s", argv[1], argv[2]);
for (whitelist = 0; whitelist < ARRAY_SIZE(whitelists); whitelist++)
if (strcmp(whitelists[whitelist].arch, argv[2]) == 0
&& strcmp(whitelists[whitelist].platform, argv[3]) == 0)
break;
if (whitelist != ARRAY_SIZE(whitelists))
whitelist_empty = whitelists[whitelist].whitelist_empty;
module_size = grub_util_get_image_size (argv[1]);
module_img = grub_util_read_image (argv[1]);
if (archs[arch].voidp_sizeof == 8)
grub_module_verify64(argv[1], module_img, module_size, &archs[arch], whitelist_empty);
else
grub_module_verify32(argv[1], module_img, module_size, &archs[arch], whitelist_empty);
return 0;
}
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