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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>
39 lines
1.0 KiB
Makefile
39 lines
1.0 KiB
Makefile
abi-variants := 32 64-v1 64-v2
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abi-32-condition := __WORDSIZE == 32
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abi-64-v1-condition := __WORDSIZE == 64 && _CALL_ELF != 2
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abi-64-v2-condition := __WORDSIZE == 64 && _CALL_ELF == 2
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ifeq ($(subdir),rt)
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librt-routines += rt-sysdep
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librt-shared-only-routines += rt-sysdep
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endif
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ifeq ($(subdir),stdlib)
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gen-as-const-headers += ucontext_i.sym
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endif
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ifeq ($(subdir),elf)
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ifeq ($(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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# Otherwise tst-tls-dlinfo fails due to tst-tlsmod2.so using static tls.
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LDFLAGS-tst-tlsmod2.so += -Wl,--no-tls-get-addr-optimize
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endif
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ifeq ($(subdir),misc)
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sysdep_headers += bits/ppc.h
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sysdep_routines += get_timebase_freq
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tests-static += test-gettimebasefreq-static
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tests += $(tests-static)
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tests += test-gettimebasefreq
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tests += test-powerpc-linux-sysconf
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endif
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ifeq ($(subdir),nptl)
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libpthread-routines += sysdep
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libpthread-sysdep_routines += elision-lock elision-unlock elision-timed \
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elision-trylock
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libpthread-shared-only-routines += sysdep
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endif
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