diff options
Diffstat (limited to 'arch/x86/include/asm/ptrace.h')
| -rw-r--r-- | arch/x86/include/asm/ptrace.h | 17 |
1 files changed, 0 insertions, 17 deletions
diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h index d20bae2..19507ff 100644 --- a/arch/x86/include/asm/ptrace.h +++ b/arch/x86/include/asm/ptrace.h @@ -113,23 +113,6 @@ static inline int user_mode(struct pt_regs *regs) #endif } -/* - * This is the fastest way to check whether regs come from user space. - * It is unsafe if regs might come from vm86 mode, though -- in vm86 - * mode, all bits of CS and SS are completely under the user's control. - * The CPU considers vm86 mode to be CPL 3 regardless of CS and SS. - * - * Do NOT use this function unless you have already ruled out the - * possibility that regs came from vm86 mode. - * - * We check for RPL != 0 instead of RPL == 3 because we don't use rings - * 1 or 2 and this is more efficient. - */ -static inline int user_mode_ignore_vm86(struct pt_regs *regs) -{ - return (regs->cs & SEGMENT_RPL_MASK) != 0; -} - static inline int v8086_mode(struct pt_regs *regs) { #ifdef CONFIG_X86_32 |
