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https://github.com/edk2-porting/linux-next.git
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275e6e1ee2
To make some half-assembly stubs compile, disable various "hardened" GCC features: *) we can't make it build PIC code as we need %ebx to do syscalls and GCC wants it free for PIC *) we can't leave stack protection as the stub is moved (not relocated!) in memory so the RIP-relative access to the canary tries reading from an unmapped address and causes a segfault, since we move the stub of various megabytes (the exact amount will be decided at runtime) away from the link-time address. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Acked-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
24 lines
663 B
Makefile
24 lines
663 B
Makefile
obj-y = bugs.o checksum.o delay.o fault.o ksyms.o ldt.o ptrace.o \
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ptrace_user.o signal.o sigcontext.o syscalls.o sysrq.o \
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sys_call_table.o tls.o
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obj-$(CONFIG_MODE_SKAS) += stub.o stub_segv.o
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subarch-obj-y = lib/bitops.o kernel/semaphore.o
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subarch-obj-$(CONFIG_HIGHMEM) += mm/highmem.o
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subarch-obj-$(CONFIG_MODULES) += kernel/module.o
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USER_OBJS := bugs.o ptrace_user.o sigcontext.o fault.o stub_segv.o
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USER_OBJS += user-offsets.s
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extra-y += user-offsets.s
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CFLAGS_stub_segv.o := $(CFLAGS_NO_HARDENING)
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extra-$(CONFIG_MODE_TT) += unmap.o
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include arch/um/scripts/Makefile.rules
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$(obj)/stub_segv.o $(obj)/unmap.o: \
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_c_flags = $(call unprofile,$(CFLAGS))
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