From: Borislav Petkov <bp@alien8.de>
To: Petr Pavlu <petr.pavlu@suse.com>
Cc: tglx@linutronix.de, mingo@redhat.com,
dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
nicolas@fjasle.eu, masahiroy@kernel.org,
kirill.shutemov@linux.intel.com, tony.luck@intel.com,
michael.roth@amd.com, nathan@kernel.org, ndesaulniers@google.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] x86: Avoid relocation information in final vmlinux
Date: Thu, 24 Nov 2022 13:38:26 +0100 [thread overview]
Message-ID: <Y39lwk3itVnsADrP@zn.tnic> (raw)
In-Reply-To: <765e1e78-c540-0753-7a19-7d335bcc998b@suse.com>
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
next prev parent reply other threads:[~2022-11-24 12:38 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-27 8:46 [PATCH v2] x86: Avoid relocation information in final vmlinux Petr Pavlu
2022-11-23 12:30 ` Borislav Petkov
2022-11-23 13:31 ` Bagas Sanjaya
2022-11-23 14:38 ` Borislav Petkov
2022-11-23 15:43 ` Petr Pavlu
2022-11-23 15:54 ` Borislav Petkov
2022-11-23 17:45 ` H. Peter Anvin
2022-11-24 10:03 ` Petr Pavlu
2022-11-24 9:21 ` Petr Pavlu
2022-11-24 12:38 ` Borislav Petkov [this message]
2022-11-24 13:33 ` Petr Pavlu
2022-11-24 15:41 ` Borislav Petkov
2022-11-25 16:41 ` Borislav Petkov
2022-11-25 19:25 ` Borislav Petkov
2022-11-28 14:38 ` Petr Pavlu
2023-06-14 18:42 ` [tip: x86/build] x86/build: " tip-bot2 for Petr Pavlu
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