diff options
| -rw-r--r-- | arch/x86/include/asm/uprobes.h | 3 | ||||
| -rw-r--r-- | arch/x86/kernel/uprobes.c | 19 |
2 files changed, 14 insertions, 8 deletions
diff --git a/arch/x86/include/asm/uprobes.h b/arch/x86/include/asm/uprobes.h index cee5862..d561ff5 100644 --- a/arch/x86/include/asm/uprobes.h +++ b/arch/x86/include/asm/uprobes.h @@ -46,8 +46,7 @@ struct arch_uprobe_task { #ifdef CONFIG_X86_64 unsigned long saved_scratch_register; #endif -#define UPROBE_CLEAR_TF (1 << 0) - unsigned int restore_flags; + unsigned int saved_tf; }; extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long addr); diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c index 3b4aae6..7e993d1 100644 --- a/arch/x86/kernel/uprobes.c +++ b/arch/x86/kernel/uprobes.c @@ -653,7 +653,7 @@ void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) * Skip these instructions as per the currently known x86 ISA. * 0x66* { 0x90 | 0x0f 0x1f | 0x0f 0x19 | 0x87 0xc0 } */ -bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs) +static bool __skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs) { int i; @@ -681,16 +681,21 @@ bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs) return false; } +bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + bool ret = __skip_sstep(auprobe, regs); + if (ret && (regs->flags & X86_EFLAGS_TF)) + send_sig(SIGTRAP, current, 0); + return ret; +} + void arch_uprobe_enable_step(struct arch_uprobe *auprobe) { struct task_struct *task = current; struct arch_uprobe_task *autask = &task->utask->autask; struct pt_regs *regs = task_pt_regs(task); - autask->restore_flags = 0; - if (!(regs->flags & X86_EFLAGS_TF) && - !(auprobe->fixups & UPROBE_FIX_SETF)) - autask->restore_flags |= UPROBE_CLEAR_TF; + autask->saved_tf = !!(regs->flags & X86_EFLAGS_TF); regs->flags |= X86_EFLAGS_TF; if (test_tsk_thread_flag(task, TIF_BLOCKSTEP)) @@ -707,6 +712,8 @@ void arch_uprobe_disable_step(struct arch_uprobe *auprobe) * SIGTRAP if we do not clear TF. We need to examine the opcode to * make it right. */ - if (autask->restore_flags & UPROBE_CLEAR_TF) + if (autask->saved_tf) + send_sig(SIGTRAP, task, 0); + else if (!(auprobe->fixups & UPROBE_FIX_SETF)) regs->flags &= ~X86_EFLAGS_TF; } |