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readelf: decode FreeBSD note types

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Decode NT_FREEBSD_ABI_TAG, NT_FREEBSD_ARCH_TAG, and NT_FREEBSD_FEATURE_CTL.

Reviewed by:	brooks, kib (earlier)
MFC after:	2 weeks
Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D19054
This commit is contained in:
emaste 2019-02-01 22:24:14 +00:00
parent c0d866da71
commit 3d924dc101
1 changed files with 50 additions and 5 deletions
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55
contrib/elftoolchain/readelf/readelf.c
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@ -313,6 +313,8 @@ static void dump_mips_specific_info(struct readelf *re);
static void dump_notes(struct readelf *re);
static void dump_notes_content(struct readelf *re, const char *buf, size_t sz,
off_t off);
static void dump_notes_data(const char *name, uint32_t type, const char *buf,
size_t sz);
static void dump_svr4_hash(struct section *s);
static void dump_svr4_hash64(struct readelf *re, struct section *s);
static void dump_gnu_hash(struct readelf *re, struct section *s);
@ -3486,12 +3488,58 @@ dump_notes(struct readelf *re)
}
}
static struct flag_desc note_feature_ctl_flags[] = {
{ NT_FREEBSD_FCTL_ASLR_DISABLE, "ASLR_DISABLE" },
{ 0, NULL }
};
static void
dump_notes_data(const char *name, uint32_t type, const char *buf, size_t sz)
{
size_t i;
const uint32_t *ubuf;
/* Note data is at least 4-byte aligned. */
if (((uintptr_t)buf & 3) != 0) {
warnx("bad note data alignment");
goto unknown;
}
ubuf = (const uint32_t *)(const void *)buf;
if (strcmp(name, "FreeBSD") == 0) {
switch (type) {
case NT_FREEBSD_ABI_TAG:
if (sz != 4)
goto unknown;
printf(" ABI tag: %u\n", ubuf[0]);
return;
/* NT_FREEBSD_NOINIT_TAG carries no data, treat as unknown. */
case NT_FREEBSD_ARCH_TAG:
if (sz != 4)
goto unknown;
printf(" Arch tag: %x\n", ubuf[0]);
return;
case NT_FREEBSD_FEATURE_CTL:
if (sz != 4)
goto unknown;
printf(" Features:");
dump_flags(note_feature_ctl_flags, ubuf[0]);
printf("\n");
return;
}
}
unknown:
printf(" description data:");
for (i = 0; i < sz; i++)
printf(" %02x", (unsigned char)buf[i]);
printf("\n");
}
static void
dump_notes_content(struct readelf *re, const char *buf, size_t sz, off_t off)
{
Elf_Note *note;
const char *end, *name;
uint32_t i;
printf("\nNotes at offset %#010jx with length %#010jx:\n",
(uintmax_t) off, (uintmax_t) sz);
@ -3523,10 +3571,7 @@ dump_notes_content(struct readelf *re, const char *buf, size_t sz, off_t off)
printf(" %-13s %#010jx", name, (uintmax_t) note->n_descsz);
printf(" %s\n", note_type(name, re->ehdr.e_type,
note->n_type));
printf(" description data:");
for (i = 0; i < note->n_descsz; i++)
printf(" %02x", (unsigned char)buf[i]);
printf("\n");
dump_notes_data(name, note->n_type, buf, note->n_descsz);
buf += roundup2(note->n_descsz, 4);
}
}