From f62570cbdcb6dd53d0e2361488f9ea2c4cf17ec9 Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Thu, 22 Jan 2015 11:27:58 -0800 Subject: [PATCH] x86, tls, ldt: Stop checking lm in LDT_empty commit e30ab185c490e9a9381385529e0fd32f0a399495 upstream. 32-bit programs don't have an lm bit in their ABI, so they can't reliably cause LDT_empty to return true without resorting to memset. They shouldn't need to do this. This should fix a longstanding, if minor, issue in all 64-bit kernels as well as a potential regression in the TLS hardening code. Fixes: 41bdc78544b8 x86/tls: Validate TLS entries to protect espfix Signed-off-by: Andy Lutomirski Cc: torvalds@linux-foundation.org Link: http://lkml.kernel.org/r/72a059de55e86ad5e2935c80aa91880ddf19d07c.1421954363.git.luto@amacapital.net Signed-off-by: Thomas Gleixner Signed-off-by: Ben Hutchings --- Reading git-format-patch failed