linux-kernel - [tip:x86/asm] x86/vdso: Remove a stale/misleading comment from the linker script

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <tip-29434801e7e9c6d05fbea4533b3c0bd6be612f62@git.kernel.org>
Date:   Wed, 5 Dec 2018 10:04:29 -0800
From:   tip-bot for Sean Christopherson <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     luto@...nel.org, tglx@...utronix.de, dave.hansen@...ux.intel.com,
        sean.j.christopherson@...el.com, peterz@...radead.org,
        bp@...en8.de, riel@...riel.com, dvlasenk@...hat.com,
        mingo@...nel.org, brgerst@...il.com, hpa@...or.com,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org
Subject: [tip:x86/asm] x86/vdso: Remove a stale/misleading comment from the
 linker script

Commit-ID:  29434801e7e9c6d05fbea4533b3c0bd6be612f62
Gitweb:     https://git.kernel.org/tip/29434801e7e9c6d05fbea4533b3c0bd6be612f62
Author:     Sean Christopherson <sean.j.christopherson@...el.com>
AuthorDate: Tue, 4 Dec 2018 13:25:58 -0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 5 Dec 2018 08:58:12 +0100

x86/vdso: Remove a stale/misleading comment from the linker script

Once upon a time, vdso2c aggressively stripped data from the vDSO
image when generating the final userspace image.  This included
stripping the .altinstructions and .altinstr_replacement sections.
Eventually, the stripping process reverted to "objdump -S" and no
longer removed the aforementioned sections, but the comment remained.

Keeping the .alt* sections at the end of the PT_LOAD segment is no
longer necessary, but there's no harm in doing so and it's a helpful
reminder that they don't need to be included in the final vDSO image,
i.e. someone may want to take another stab at zapping/stripping the
unneeded sections.

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Acked-by: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...riel.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Fixes: da861e18eccc ("x86, vdso: Get rid of the fake section mechanism")
Link: http://lkml.kernel.org/r/20181204212600.28090-3-sean.j.christopherson@intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/entry/vdso/vdso-layout.lds.S | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/x86/entry/vdso/vdso-layout.lds.S b/arch/x86/entry/vdso/vdso-layout.lds.S
index 0cedc905c8d6..93c6dc7812d0 100644
--- a/arch/x86/entry/vdso/vdso-layout.lds.S
+++ b/arch/x86/entry/vdso/vdso-layout.lds.S
@@ -65,11 +65,6 @@ SECTIONS
 
 	.text		: { *(.text*) }			:text	=0x90909090,
 
-	/*
-	 * At the end so that eu-elflint stays happy when vdso2c strips
-	 * these.  A better implementation would avoid allocating space
-	 * for these.
-	 */
 	.altinstructions	: { *(.altinstructions) }	:text
 	.altinstr_replacement	: { *(.altinstr_replacement) }	:text