[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>
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@ -141,8 +141,11 @@ static int is_at_popf(struct task_struct *child, struct pt_regs *regs)
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case 0xf0: case 0xf2: case 0xf3:
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continue;
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/* REX prefixes */
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case 0x40 ... 0x4f:
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if (regs->cs != __USER_CS)
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/* 32-bit mode: register increment */
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return 0;
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/* 64-bit mode: REX prefix */
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continue;
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/* CHECKME: f0, f2, f3 */
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