Szabolcs Nagy c0669ae1a6 elf: Refactor _dl_update_slotinfo to avoid use after free
map is not valid to access here because it can be freed by a concurrent
dlclose: during tls access (via __tls_get_addr) _dl_update_slotinfo is
called without holding dlopen locks. So don't check the modid of map.

The map == 0 and map != 0 code paths can be shared (avoiding the dtv
resize in case of map == 0 is just an optimization: larger dtv than
necessary would be fine too).

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2021-04-15 09:30:43 +01:00
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