x86/asm/32: Fix regs_get_register() on segment registers
authorAndy Lutomirski <luto@kernel.org>
Wed, 9 Aug 2017 21:39:45 +0000 (14:39 -0700)
committerIngo Molnar <mingo@kernel.org>
Thu, 10 Aug 2017 11:14:58 +0000 (13:14 +0200)
commit603e492e861861ddfec7139a007abad74f0d3af0
treeddc83a612c7960e21f889f1fd18ce44b817a182e
parent8a9949bc71a71b3dd633255ebe8f8869b1f73474
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@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/0b76f6dbe477b7b1a81938fddcc3c483d48f0ff2.1502314765.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/include/asm/ptrace.h