Date: Sun, 21 Jan 2024 15:33:05 -0800 From: Fangrui Song <i@...kray.me> To: musl@...ts.openwall.com Subject: DT_PREINIT_ARRAY support There is a DT_PREINIT_ARRAY patch that falls through the cracks: https://www.openwall.com/lists/musl/2016/05/17/2 I wonder whether it can be visited again. I ported sanitizers to upstream compiler-rt. I have not had time to track the latest status for musl, but I know that quite a few sanitizers will benefit from musl supporting the feature and see another recent issue about tsan (https://github.com/llvm/llvm-project/issues/78452). --- Some notes about DT_PREINIT_ARRAY The linker defines DT_PREINIT_ARRAY and DT_PREINIT_ARRAYSZ according to the address and size of .preinit_array. The linker also defines __preinit_array_start and __preinit_array_end if referenced. The generic ABI says: > DT_PREINIT_ARRAY: This element holds the address of the array of pointers to pre-initialization functions, discussed in ``Initialization and Termination Functions'' below. The DT_PREINIT_ARRAY table is processed only in an executable file; it is ignored if contained in a shared object. DT_PREINIT_ARRAY only applies to the executable. This feature gives the executable a way to run initialization functions before shared object dependencies. There is no .postfini_array. Most ld.so implementations support DT_PREINIT_ARRAY.
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