cheri: elf: Setup per module RX and RW capabilities

_dl_map_segments must use capabilities, this required changes beyond
the obvious elfptr_t changes:

- Ensure map_end is derived from map_start,

- Use strict mmap bounds with MAP_FIXED: c->mapend is aligned up to
  pagesize which may be out of bounds of l_map_start (covering the
  load segments, but bounds are not aligned up), so use c->dataend
  instead.

Propagate l_map_start and l_rw_start capabilities of ld.so and exe that
come from auxv, and ensure they are not recomputed incorrectly by ld.so.

The l_rw_range should exclude the relro region, but in libc.so and
ld.so this does not work: symbols are accessed before relro is applied
and then the permission should be writable.

0 files changed, 0 insertions, 0 deletions