On Mon, Jun 29, 2020 at 11:54:01AM -0400, Arvind Sankar wrote:

On Sun, Jun 28, 2020 at 11:18:37PM -0700, Kees Cook wrote:

quoted

We don't want to depend on the linker's orphan section placement
heuristics as these can vary between linkers, and may change between
versions. All sections need to be explicitly named in the linker
script.

Specifically, this would have made a recently fixed bug very obvious:

ld: warning: orphan section `.fixup' from `arch/arm/lib/copy_from_user.o' being placed in section `.fixup'

Discard unneeded sections .iplt, .rel.iplt, .igot.plt, and .modinfo.

Add missing text stub sections .vfp11_veneer and .v4_bx.

Add debug sections explicitly.

Finally enable orphan section warning.

This is unrelated to this patch as such, but I noticed that ARM32/64 places
the .got section inside .text -- is that expected on ARM?

Do you mean in general, in the kernel vmlinux, in the decompressor
vmlinux or ... ?

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