Messages in this thread | | | Date | Thu, 24 Nov 2022 13:38:26 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH v2] x86: Avoid relocation information in final vmlinux |
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On Thu, Nov 24, 2022 at 10:21:33AM +0100, Petr Pavlu wrote: > Option CONFIG_RANDOMIZE_BASE=y needs to be enabled. Switching it on should > automatically select also CONFIG_X86_NEED_RELOCS=y which is what actually > enables use of --emit-relocs in arch/x86/Makefile.
Yeah, as I said in my previous mail:
"and before and after .configs simply have RANDOMIZE_BASE =n and =y, respectively."
I just did it again to make sure:
-rwxr-xr-x 1 boris boris 377666112 Nov 24 13:28 vmlinux.before -rwxr-xr-x 1 boris boris 377718768 Nov 24 13:33 vmlinux.after
With
$ grep -E "(NEED_RELOCS|RANDOMIZE)" .config CONFIG_RANDOMIZE_BASE=y CONFIG_X86_NEED_RELOCS=y CONFIG_RANDOMIZE_MEMORY=y CONFIG_RANDOMIZE_MEMORY_PHYSICAL_PADDING=0x0 CONFIG_ARCH_HAS_ELF_RANDOMIZE=y CONFIG_HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET=y CONFIG_RANDOMIZE_KSTACK_OFFSET=y
that second vmlinux file is even a bit larger (~51K) ...
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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