linux-kernel - [tip:x86/asm] x86/asm/32: Fix regs_get

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Date:   Thu, 10 Aug 2017 05:23:09 -0700
From:   tip-bot for Andy Lutomirski <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     peterz@...radead.org, bp@...en8.de, tglx@...utronix.de,
        mingo@...nel.org, rostedt@...dmis.org,
        linux-kernel@...r.kernel.org, dvlasenk@...hat.com,
        jpoimboe@...hat.com, hpa@...or.com, brgerst@...il.com,
        luto@...nel.org, torvalds@...ux-foundation.org
Subject: [tip:x86/asm] x86/asm/32: Fix regs_get_register() on segment
 registers

Commit-ID:  603e492e861861ddfec7139a007abad74f0d3af0
Gitweb:     http://git.kernel.org/tip/603e492e861861ddfec7139a007abad74f0d3af0
Author:     Andy Lutomirski <luto@...nel.org>
AuthorDate: Wed, 9 Aug 2017 14:39:45 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 10 Aug 2017 13:14:58 +0200

x86/asm/32: Fix regs_get_register() on segment registers

The segment register high words on x86_32 may contain garbage.
Teach regs_get_register() to read them as u16 instead of unsigned
long.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/0b76f6dbe477b7b1a81938fddcc3c483d48f0ff2.1502314765.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/ptrace.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h
index a29f828..91c04c8 100644
--- a/arch/x86/include/asm/ptrace.h
+++ b/arch/x86/include/asm/ptrace.h
@@ -196,6 +196,17 @@ static inline unsigned long regs_get_register(struct pt_regs *regs,
 	if (offset == offsetof(struct pt_regs, sp) &&
 	    regs->cs == __KERNEL_CS)
 		return kernel_stack_pointer(regs);
+
+	/* The selector fields are 16-bit. */
+	if (offset == offsetof(struct pt_regs, cs) ||
+	    offset == offsetof(struct pt_regs, ss) ||
+	    offset == offsetof(struct pt_regs, ds) ||
+	    offset == offsetof(struct pt_regs, es) ||
+	    offset == offsetof(struct pt_regs, fs) ||
+	    offset == offsetof(struct pt_regs, gs)) {
+		return *(u16 *)((unsigned long)regs + offset);
+
+	}
 #endif
 	return *(unsigned long *)((unsigned long)regs + offset);
 }