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[PATCH] fix is_at_popf() for compat tasks 

When testing for the REX instruction prefix, first check
for 32-bit mode because in compat mode the REX prefix is an
increment instruction.

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Chuck Ebbert 2006-09-26 10:52:32 +02:00 committed by Andi Kleen
parent 8578bdf835
commit a752d7194c
1 changed files with 4 additions and 1 deletions
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5
arch/x86_64/kernel/ptrace.c
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@ -141,8 +141,11 @@ static int is_at_popf(struct task_struct *child, struct pt_regs *regs)
case 0xf0: case 0xf2: case 0xf3:
continue;
/* REX prefixes */
case 0x40 ... 0x4f:
if (regs->cs != __USER_CS)
/* 32-bit mode: register increment */
return 0;
/* 64-bit mode: REX prefix */
continue;
/* CHECKME: f0, f2, f3 */