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On 11/08/2016 04:13 PM, Florian Weimer wrote:
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h index f68fdf4..801ded8 100644 --- a/sysdeps/generic/ldsodefs.h +++ b/sysdeps/generic/ldsodefs.h @@ -607,6 +607,10 @@ struct rtld_global_ro /* List of auditing interfaces. */ struct audit_ifaces *_dl_audit; unsigned int _dl_naudit; + + /* malloc protection keys. */ + uintptr_t _dl_malloc_header_guard; + uintptr_t _dl_malloc_footer_guard; }; # define __rtld_global_attribute__ # if IS_IN (rtld)
This way of carrying information from ld.so to libc.so.6 does not work in the static dlopen case because rtld_global_ro is only initialized from the static initializer. The code in security_init is never called, and so the two cookie values are always 0.
I believe this is a pre-existing bug in static dlopen, but I'll need to write a test case first.
Florian
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