linux-kernel - [PATCH 1/4] x86-32: Simplify ELF_CORE_COPY

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

Message-Id: <20220325153953.162643-2-brgerst@gmail.com>
Date:   Fri, 25 Mar 2022 11:39:50 -0400
From:   Brian Gerst <brgerst@...il.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Brian Gerst <brgerst@...il.com>
Subject: [PATCH 1/4] x86-32: Simplify ELF_CORE_COPY_REGS

GS is now always a user segment, so there is no difference between
user and kernel registers.

Signed-off-by: Brian Gerst <brgerst@...il.com>
---
 arch/x86/include/asm/elf.h | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
index 29fea180a665..cb0ff1055ab1 100644
--- a/arch/x86/include/asm/elf.h
+++ b/arch/x86/include/asm/elf.h
@@ -116,7 +116,7 @@ extern unsigned int vdso32_enabled;
  * now struct_user_regs, they are different)
  */
 
-#define ELF_CORE_COPY_REGS_COMMON(pr_reg, regs)	\
+#define ELF_CORE_COPY_REGS(pr_reg, regs)	\
 do {						\
 	pr_reg[0] = regs->bx;			\
 	pr_reg[1] = regs->cx;			\
@@ -128,6 +128,7 @@ do {						\
 	pr_reg[7] = regs->ds;			\
 	pr_reg[8] = regs->es;			\
 	pr_reg[9] = regs->fs;			\
+	savesegment(gs, pr_reg[10]);		\
 	pr_reg[11] = regs->orig_ax;		\
 	pr_reg[12] = regs->ip;			\
 	pr_reg[13] = regs->cs;			\
@@ -136,18 +137,6 @@ do {						\
 	pr_reg[16] = regs->ss;			\
 } while (0);
 
-#define ELF_CORE_COPY_REGS(pr_reg, regs)	\
-do {						\
-	ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
-	pr_reg[10] = get_user_gs(regs);		\
-} while (0);
-
-#define ELF_CORE_COPY_KERNEL_REGS(pr_reg, regs)	\
-do {						\
-	ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\
-	savesegment(gs, pr_reg[10]);		\
-} while (0);
-
 #define ELF_PLATFORM	(utsname()->machine)
 #define set_personality_64bit()	do { } while (0)
 
-- 
2.35.1