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1bdda52fe9
This patch moves the vDSO setup from libc to loader code, just after the vDSO link_map setup. For static case the initialization is moved to _dl_non_dynamic_init instead. Instead of using the mangled pointer, the vDSO data is set as attribute_relro (on _rtld_global_ro for shared or _dl_vdso_* for static). It is read-only even with partial relro. It fixes BZ#24967 now that the vDSO pointer is setup earlier than malloc interposition is called. Also, vDSO calls should not be a problem for static dlopen as indicated by BZ#20802. The vDSO pointer would be zero-initialized and the syscall will be issued instead. Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, powerpc64-linux-gnu, powerpc-linux-gnu, s390x-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. I also run some tests on mips. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
32 lines
697 B
Makefile
32 lines
697 B
Makefile
ifeq ($(subdir),csu)
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sysdep_routines += __read_tp libc-__read_tp
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static-only-routines += __read_tp
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shared-only-routines += libc-__read_tp
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endif
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ifeq ($(subdir),elf)
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sysdep-rtld-routines += __read_tp
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ifeq ($(build-shared),yes)
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# This is needed for DSO loading from static binaries.
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sysdep-dl-routines += dl-static
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endif
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endif
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ifeq ($(subdir),misc)
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sysdep_headers += sys/elf.h
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endif
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ifeq ($(subdir),stdlib)
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gen-as-const-headers += ucontext_i.sym
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endif
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abi-variants := lp64
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abi-variants += lp64_be
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ifeq (,$(filter $(default-abi),$(abi-variants)))
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Unknown ABI, must be one of $(abi-variants)
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endif
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abi-lp64-condition := !defined __AARCH64EB__
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abi-lp64_be-condition := defined __AARCH64EB__
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