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Fix recursive dlopen.

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The ability to recursively call dlopen is useful for malloc
implementations that wish to load other dynamic modules that
implement reentrant/AS-safe functions to use in their own
implementation.

Given that a user malloc implementation may be called by an
ongoing dlopen to allocate memory the user malloc
implementation interrupts dlopen and if it calls dlopen again
that's a reentrant call.

This patch fixes the issues with the ld.so.cache mapping
and the _r_debug assertion which prevent this from working
as expected.

See:
https://sourceware.org/ml/libc-alpha/2014-12/msg00446.html
This commit is contained in:
Carlos O'Donell
2015-01-21 01:51:10 -05:00
parent 042e1521c7
commit ccdb048df4
10 changed files with 222 additions and 21 deletions
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4
elf/dl-open.c
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@ -217,7 +217,9 @@ dl_open_worker (void *a)
args->nsid = call_map->l_ns;
}
assert (_dl_debug_initialize (0, args->nsid)->r_state == RT_CONSISTENT);
/* One might be tempted to assert that we are RT_CONSISTENT at this point, but that
may not be true if this is a recursive call to dlopen. */
_dl_debug_initialize (0, args->nsid);
/* Load the named object. */
struct link_map *new;