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Diffstat (limited to 'arch/x86_64/kernel/traps.c')
-rw-r--r--arch/x86_64/kernel/traps.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index ee1b2da9e5e..28d50dc540e 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -90,6 +90,20 @@ static inline void conditional_sti(struct pt_regs *regs)
local_irq_enable();
}
+static inline void preempt_conditional_sti(struct pt_regs *regs)
+{
+ preempt_disable();
+ if (regs->eflags & X86_EFLAGS_IF)
+ local_irq_enable();
+}
+
+static inline void preempt_conditional_cli(struct pt_regs *regs)
+{
+ if (regs->eflags & X86_EFLAGS_IF)
+ local_irq_disable();
+ preempt_enable_no_resched();
+}
+
static int kstack_depth_to_print = 10;
#ifdef CONFIG_KALLSYMS
@@ -693,7 +707,7 @@ asmlinkage void __kprobes do_debug(struct pt_regs * regs,
SIGTRAP) == NOTIFY_STOP)
return;
- conditional_sti(regs);
+ preempt_conditional_sti(regs);
/* Mask out spurious debug traps due to lazy DR7 setting */
if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) {
@@ -738,11 +752,13 @@ asmlinkage void __kprobes do_debug(struct pt_regs * regs,
clear_dr7:
set_debugreg(0UL, 7);
+ preempt_conditional_cli(regs);
return;
clear_TF_reenable:
set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
regs->eflags &= ~TF_MASK;
+ preempt_conditional_cli(regs);
}
static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)