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Teach the readelf about arm64 gnu properties

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On arm64 binaries can be tagged as using BTI or PAC. Add support to
decode these to the elftoolchain readelf.

To simplify the code use a table based method to find the flag
description table.

Reviewed by:	emaste
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D32315
This commit is contained in:
Andrew Turner 2021-09-17 15:54:31 +00:00
parent a90ebeb5fe
commit aacbf3fb84
1 changed files with 63 additions and 6 deletions
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69
contrib/elftoolchain/readelf/readelf.c
View File

@ -229,6 +229,12 @@ struct flag_desc {
const char *desc;
};
struct flag_desc_list {
uint32_t type;
const char *desc_str;
struct flag_desc *desc;
};
struct mips_option {
uint64_t flag;
const char *desc;
@ -3539,15 +3545,50 @@ dump_gnu_hash(struct readelf *re, struct section *s)
free(bl);
}
static struct flag_desc gnu_property_aarch64_feature_1_and_bits[] = {
{ GNU_PROPERTY_AARCH64_FEATURE_1_BTI, "BTI" },
{ GNU_PROPERTY_AARCH64_FEATURE_1_PAC, "PAC" },
{ 0, NULL }
};
static struct flag_desc_list gnu_property_aarch64[] = {
{
GNU_PROPERTY_AARCH64_FEATURE_1_AND,
"AArch64 features",
gnu_property_aarch64_feature_1_and_bits
},
{ 0, NULL, NULL }
};
static struct flag_desc gnu_property_x86_feature_1_and_bits[] = {
{ GNU_PROPERTY_X86_FEATURE_1_IBT, "IBT" },
{ GNU_PROPERTY_X86_FEATURE_1_SHSTK, "SHSTK" },
{ 0, NULL }
};
static struct flag_desc_list gnu_property_x86[] = {
{
GNU_PROPERTY_X86_FEATURE_1_AND,
"x64 features",
gnu_property_x86_feature_1_and_bits
},
{ 0, NULL, NULL }
};
static struct {
unsigned int emachine;
struct flag_desc_list *flag_list;
} gnu_property_archs[] = {
{ EM_AARCH64, gnu_property_aarch64 },
{ EM_X86_64, gnu_property_x86 },
{ 0, NULL }
};
static void
dump_gnu_property_type_0(struct readelf *re, const char *buf, size_t sz)
{
struct flag_desc_list *desc_list;
struct flag_desc *desc;
size_t i;
uint32_t type, prop_sz;
@ -3566,19 +3607,35 @@ dump_gnu_property_type_0(struct readelf *re, const char *buf, size_t sz)
if (type >= GNU_PROPERTY_LOPROC &&
type <= GNU_PROPERTY_HIPROC) {
if (re->ehdr.e_machine != EM_X86_64) {
desc_list = NULL;
for (i = 0; gnu_property_archs[i].flag_list != NULL;
i++) {
if (gnu_property_archs[i].emachine ==
re->ehdr.e_machine) {
desc_list =
gnu_property_archs[i].flag_list;
break;
}
}
if (desc_list == NULL) {
printf("machine type %x unknown\n",
re->ehdr.e_machine);
goto unknown;
}
switch (type) {
case GNU_PROPERTY_X86_FEATURE_1_AND:
printf("x86 features:");
desc = NULL;
for (i = 0; desc_list[i].desc != NULL; i++) {
if (desc_list[i].type == type) {
desc = desc_list[i].desc;
break;
}
}
if (desc != NULL) {
printf("%s:", desc_list[i].desc_str);
if (prop_sz != 4)
goto bad;
dump_flags(gnu_property_x86_feature_1_and_bits,
dump_flags(desc,
*(const uint32_t *)(const void *)buf);
break;
}
}