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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e9e08a0738
With CONFIG_LKDTM=y and make OBJCOPY=llvm-objcopy, llvm-objcopy errors:
llvm-objcopy: error: --set-section-flags=.text conflicts with
--rename-section=.text=.rodata
Rather than support setting flags then renaming sections vs renaming
then setting flags, it's simpler to just change both at the same time
via --rename-section. Adding the load flag is required for GNU objcopy
to mark .rodata Type as PROGBITS after the rename.
This can be verified with:
$ readelf -S drivers/misc/lkdtm/rodata_objcopy.o
...
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
...
[ 1] .rodata PROGBITS 0000000000000000 00000040
0000000000000004 0000000000000000 A 0 0 4
...
Which shows that .text is now renamed .rodata, the alloc flag A is set,
the type is PROGBITS, and the section is not flagged as writeable W.
Cc: stable@vger.kernel.org
Link: https://sourceware.org/bugzilla/show_bug.cgi?id=24554
Link: https://github.com/ClangBuiltLinux/linux/issues/448
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Suggested-by: Alan Modra <amodra@gmail.com>
Suggested-by: Jordan Rupprect <rupprecht@google.com>
Suggested-by: Kees Cook <keescook@chromium.org>
Acked-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
22 lines
637 B
Makefile
22 lines
637 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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obj-$(CONFIG_LKDTM) += lkdtm.o
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lkdtm-$(CONFIG_LKDTM) += core.o
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lkdtm-$(CONFIG_LKDTM) += bugs.o
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lkdtm-$(CONFIG_LKDTM) += heap.o
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lkdtm-$(CONFIG_LKDTM) += perms.o
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lkdtm-$(CONFIG_LKDTM) += refcount.o
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lkdtm-$(CONFIG_LKDTM) += rodata_objcopy.o
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lkdtm-$(CONFIG_LKDTM) += usercopy.o
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lkdtm-$(CONFIG_LKDTM) += stackleak.o
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KASAN_SANITIZE_stackleak.o := n
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KCOV_INSTRUMENT_rodata.o := n
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OBJCOPYFLAGS :=
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OBJCOPYFLAGS_rodata_objcopy.o := \
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--rename-section .text=.rodata,alloc,readonly,load
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targets += rodata.o rodata_objcopy.o
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$(obj)/rodata_objcopy.o: $(obj)/rodata.o FORCE
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$(call if_changed,objcopy)
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