From 6f3ead0ae16deb9f0004b275e29a276c9712ee3c Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Mon, 12 Sep 2022 08:30:36 -0400 Subject: process DT_RELR relocations in ldso-startup/static-pie commit d32dadd60efb9d3b255351a3b532f8e4c3dd0db1 added DT_RELR processing for programs and shared libraries processed by the dynamic linker, but left them unsupported in the dynamic linker itseld and in static pie binaries, which self-relocate via code in dlstart.c. add the equivalent processing to this code path so that there are not arbitrary restrictions on where the new packed relative relocation form can be used. --- ldso/dlstart.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/ldso/dlstart.c b/ldso/dlstart.c index 20d50f2c..259f5e18 100644 --- a/ldso/dlstart.c +++ b/ldso/dlstart.c @@ -140,6 +140,21 @@ hidden void _dlstart_c(size_t *sp, size_t *dynv) size_t *rel_addr = (void *)(base + rel[0]); *rel_addr = base + rel[2]; } + + rel = (void *)(base+dyn[DT_RELR]); + rel_size = dyn[DT_RELRSZ]; + size_t *relr_addr = 0; + for (; rel_size; rel++, rel_size-=sizeof(size_t)) { + if ((rel[0]&1) == 0) { + relr_addr = (void *)(base + rel[0]); + *relr_addr++ += base; + } else { + for (size_t i=0, bitmap=rel[0]; bitmap>>=1; i++) + if (bitmap&1) + relr_addr[i] += base; + relr_addr += 8*sizeof(size_t)-1; + } + } #endif stage2_func dls2; -- cgit 1.4.1