On Tue, 30 Jan 2007 18:00:46 +0900 [EMAIL PROTECTED] wrote: > Hi, > > It seems that some symbols in libc is resolved by libc entities > which is linked with RTLD to implement it. > > % nm -D ld-elf.so.1 > ... > 000158ec T mmap > 0000c4fc W mprotect > 0000c4dc W munmap > ...
It doesn't. rtld is a special beast and its symbols availability to user programs is controlled by a special code in rtld. Look up static func_ptr_type exports[] in rtld.c and see how it is used. -- Alexander Kabaev P.S. The proper way to control symbol visibility is to use version script file when linking rtld-elf.so.1 in order to force all unintended symbols to local scope. exports array is there for historical reasons.
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