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dlfcn: dlerror needs to call free from the base namespace [BZ #24773]

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Calling free directly may end up freeing a pointer allocated by the
dynamic loader using malloc from libc.so in the base namespace using
the allocator from libc.so in a secondary namespace, which results in
crashes.

This commit redirects the free call through GLRO and the dynamic
linker, to reach the correct namespace.  It also cleans up the dlerror
handling along the way, so that pthread_setspecific is no longer
needed (which avoids triggering bug 24774).
This commit is contained in:
Florian Weimer
2021-04-21 19:49:51 +02:00
parent b2964eb1d9
commit fada901819
14 changed files with 335 additions and 235 deletions
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elf/rtld.c
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@ -369,6 +369,7 @@ struct rtld_global_ro _rtld_global_ro attribute_relro =
._dl_open = _dl_open,
._dl_close = _dl_close,
._dl_catch_error = _rtld_catch_error,
._dl_error_free = _dl_error_free,
._dl_tls_get_addr_soft = _dl_tls_get_addr_soft,
#ifdef HAVE_DL_DISCOVER_OSVERSION
._dl_discover_osversion = _dl_discover_osversion