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authorCarlos O'Donell <carlos@systemhalted.org>2015-01-21 01:51:10 -0500
committerCarlos O'Donell <carlos@systemhalted.org>2015-01-21 01:51:10 -0500
commitccdb048df457d581f6ac7ede8b0c7a593a891dfa (patch)
tree9f87447c45093fb2ded95c982e68c9e6e886129c /sysdeps/generic
parent042e1521c794a945edc43b5bfa7e69ad70420524 (diff)
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Fix recursive dlopen.
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
Diffstat (limited to 'sysdeps/generic')
-rw-r--r--sysdeps/generic/ldsodefs.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 96dec1f436..d738988375 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -905,8 +905,8 @@ extern const struct r_strlenpair *_dl_important_hwcaps (const char *platform,
      internal_function;
 
 /* Look up NAME in ld.so.cache and return the file name stored there,
-   or null if none is found.  */
-extern const char *_dl_load_cache_lookup (const char *name)
+   or null if none is found.  Caller must free returned string.  */
+extern char *_dl_load_cache_lookup (const char *name)
      internal_function;
 
 /* If the system does not support MAP_COPY we cannot leave the file open