Date: Mon, 6 Jul 2015 23:34:49 +0300 (MSK) From: Alexander Monakov <amonakov@...ras.ru> To: musl@...ts.openwall.com Subject: Re: Making a shared library that intercepts call to main work with musl compiled binary > > Furthermore, even with dynamic linking you cannot interpose 'main' in the > > executable via LD_PRELOAD. Even more baffling is that the linked code > > interposes __libc_start_main; I'm lost for words that it happens to work with > > glibc. > > Presumably it interposes __libc_start_main because it can't interpose > main. As far as I can tell the only reason it does this is to inject > fake argv. I'm skeptical as to whether it works correctly. I was wrong about interposition on __libc_start_main being somehow surprising -- I missed that it's called from the main executable's startup routine, not from the dynamic linker (thanks to Rich for explaining that on IRC!). So as a result I expect that original code should usually work in practice. Alexander
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