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| author | Fangrui Song <i@maskray.me> | 2022-08-02 17:24:47 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2022-08-02 17:27:45 -0400 |
| commit | d32dadd60efb9d3b255351a3b532f8e4c3dd0db1 (patch) | |
| tree | 138a5a8889ec07ec020f12ecea4a7341611319b0 /ldso | |
| parent | 2404d9d643763e6eceafa9a1918925d80a84ad44 (diff) | |
| download | musl-d32dadd60efb9d3b255351a3b532f8e4c3dd0db1.tar.gz musl-d32dadd60efb9d3b255351a3b532f8e4c3dd0db1.tar.xz musl-d32dadd60efb9d3b255351a3b532f8e4c3dd0db1.zip | |
ldso: support DT_RELR relative relocation format
this resolves DT_RELR relocations in non-ldso, dynamic-linked objects.
Diffstat (limited to 'ldso')
| -rw-r--r-- | ldso/dynlink.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/ldso/dynlink.c b/ldso/dynlink.c index cc677952..e92f03cb 100644 --- a/ldso/dynlink.c +++ b/ldso/dynlink.c @@ -210,7 +210,8 @@ static void decode_vec(size_t *v, size_t *a, size_t cnt) size_t i; for (i=0; i<cnt; i++) a[i] = 0; for (; v[0]; v+=2) if (v[0]-1<cnt-1) { - a[0] |= 1UL<<v[0]; + if (v[0] < 8*sizeof(long)) + a[0] |= 1UL<<v[0]; a[v[0]] = v[1]; } } @@ -515,6 +516,23 @@ static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stri } } +static void do_relr_relocs(struct dso *dso, size_t *relr, size_t relr_size) +{ + unsigned char *base = dso->base; + size_t *reloc_addr; + for (; relr_size; relr++, relr_size-=sizeof(size_t)) + if ((relr[0]&1) == 0) { + reloc_addr = laddr(dso, relr[0]); + *reloc_addr++ += (size_t)base; + } else { + int i = 0; + for (size_t bitmap=relr[0]; (bitmap>>=1); i++) + if (bitmap&1) + reloc_addr[i] += (size_t)base; + reloc_addr += 8*sizeof(size_t)-1; + } +} + static void redo_lazy_relocs() { struct dso *p = lazy_head, *next; @@ -1357,6 +1375,7 @@ static void reloc_all(struct dso *p) 2+(dyn[DT_PLTREL]==DT_RELA)); do_relocs(p, laddr(p, dyn[DT_REL]), dyn[DT_RELSZ], 2); do_relocs(p, laddr(p, dyn[DT_RELA]), dyn[DT_RELASZ], 3); + do_relr_relocs(p, laddr(p, dyn[DT_RELR]), dyn[DT_RELRSZ]); if (head != &ldso && p->relro_start != p->relro_end) { long ret = __syscall(SYS_mprotect, laddr(p, p->relro_start), |