commit 3c36c6aa4aa1b3483c6a0370028608367426f58e
author Chuck Ebbert <76306.1226@compuserve.com> Thu Mar 23 02:59:39 2006 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> Thu Mar 23 07:38:04 2006 -0800
tree 2eaa033543eb67536f7da6ac1912f7a41e87ff7e
parent cc04ee9cc527e314e6906849ee931c33764f861e

[PATCH] i386: Don't let ptrace set the nested task bit

There's no good reason for allowing ptrace to set the NT bit in EFLAGS, so
mask it off.

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/kernel/ptrace.c

diff --git a/arch/i386/kernel/ptrace.c b/arch/i386/kernel/ptrace.c
index 5c1fb6a..506462e 100644
--- a/arch/i386/kernel/ptrace.c
+++ b/arch/i386/kernel/ptrace.c
@@ -34,10 +34,10 @@
 
 /*
  * Determines which flags the user has access to [1 = access, 0 = no access].
- * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), IOPL(12-13), IF(9).
+ * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), NT(14), IOPL(12-13), IF(9).
  * Also masks reserved bits (31-22, 15, 5, 3, 1).
  */
-#define FLAG_MASK 0x00054dd5
+#define FLAG_MASK 0x00050dd5
 
 /* set's the trap flag. */
 #define TRAP_FLAG 0x100