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process DT_RELR relocations in ldso-startup/static-pie

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commit d32dadd60e 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.
This commit is contained in:
Rich Felker 2022-09-12 08:30:36 -04:00
parent 25085c85a0
commit 6f3ead0ae1
1 changed files with 15 additions and 0 deletions
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15
ldso/dlstart.c
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@ -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;