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git://sourceware.org/git/glibc.git
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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>
47 lines
1.3 KiB
Makefile
47 lines
1.3 KiB
Makefile
# We don't need any header files.
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abi-includes :=
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abi-variants := 32 64 x32
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abi-32-condition := !defined __x86_64__
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abi-64-condition := defined __x86_64__ && defined __LP64__
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abi-x32-condition := defined __x86_64__ && defined __ILP32__
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ifeq ($(subdir),misc)
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sysdep_headers += sys/elf.h sys/perm.h sys/reg.h sys/vm86.h sys/debugreg.h sys/io.h
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endif
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ifeq ($(subdir),nptl)
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libpthread-sysdep_routines += elision-lock elision-unlock elision-timed \
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elision-trylock
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CFLAGS-elision-lock.c += -mrtm
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CFLAGS-elision-unlock.c += -mrtm
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CFLAGS-elision-timed.c += -mrtm
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CFLAGS-elision-trylock.c += -mrtm
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endif
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ifeq ($(subdir),setjmp)
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tests += tst-saved_mask-1
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endif
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ifeq ($(enable-cet),yes)
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ifeq ($(subdir),elf)
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tests += tst-cet-property-1 tst-cet-property-2
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CFLAGS-tst-cet-property-1.o += -fcf-protection
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ASFLAGS-tst-cet-property-dep-2.o += -fcf-protection
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$(objpfx)tst-cet-property-2: $(objpfx)tst-cet-property-dep-2.o
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$(objpfx)tst-cet-property-2.out: $(objpfx)tst-cet-property-2 \
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$(objpfx)tst-cet-property-1.out
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env $(run-program-env) $(test-via-rtld-prefix) \
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$(objpfx)tst-cet-property-2 \
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< $(objpfx)tst-cet-property-1.out > $@; \
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$(evaluate-test)
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endif
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ifeq ($(subdir),stdlib)
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tests += tst-cet-setcontext-1
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CFLAGS-tst-cet-setcontext-1.c += -mshstk
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endif
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endif
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