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

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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>
This commit is contained in:
Chuck Ebbert 2006-03-23 02:59:39 -08:00 committed by Linus Torvalds
parent cc04ee9cc5
commit 3c36c6aa4a
1 changed files with 2 additions and 2 deletions
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4
arch/i386/kernel/ptrace.c
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@ -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