Date: Fri, 31 Oct 2014 12:09:13 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: magic constants in some startup code On Fri, Oct 31, 2014 at 10:31:45AM -0400, Richard Gorton wrote: > Thank you (and a follow up question) - what code looks at this > canary? It is assigned to pthread_self()->canary, but I do not see > any code inside musl itself that checks that value? A work in > progress? Or does other code check this value? It's part of the stack-protector feature at the compiler level. gcc, clang, and any other compilers that implement this feature generate code to read the canary at the start of a function protected by stack protector, store it between the saved return address and local buffers, and check that it hasn't been clobbered before returning. Rich
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