From 89cb14c0dd0e4a7d0315d19f449389c4d49237ee Mon Sep 17 00:00:00 2001 From: Keshavamurthy Anil S Date: Thu, 23 Jun 2005 00:09:35 -0700 Subject: [PATCH] Kprobes/IA64: check jprobe break before handling Once the jprobe instrumented function returns, it executes a jprobe_break which is a break instruction with __IA64_JPROBE_BREAK value. The current patch checks for this break value, before assuming that jprobe instrumented function just completed. The previous code was not checking for this value and that was a bug. Signed-off-by: Anil S Keshavamurthy Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/ia64/kernel/kprobes.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'arch/ia64') diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c index 027d656..41e80b4 100644 --- a/arch/ia64/kernel/kprobes.c +++ b/arch/ia64/kernel/kprobes.c @@ -419,10 +419,11 @@ static void prepare_ss(struct kprobe *p, struct pt_regs *regs) ia64_psr(regs)->ss = 1; } -static int pre_kprobes_handler(struct pt_regs *regs) +static int pre_kprobes_handler(struct die_args *args) { struct kprobe *p; int ret = 0; + struct pt_regs *regs = args->regs; kprobe_opcode_t *addr = (kprobe_opcode_t *)instruction_pointer(regs); preempt_disable(); @@ -437,7 +438,7 @@ static int pre_kprobes_handler(struct pt_regs *regs) } arch_disarm_kprobe(p); ret = 1; - } else { + } else if (args->err == __IA64_BREAK_JPROBE) { /* * jprobe instrumented function just completed */ @@ -445,6 +446,9 @@ static int pre_kprobes_handler(struct pt_regs *regs) if (p->break_handler && p->break_handler(p, regs)) { goto ss_probe; } + } else { + /* Not our break */ + goto no_kprobe; } } @@ -515,7 +519,7 @@ int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val, struct die_args *args = (struct die_args *)data; switch(val) { case DIE_BREAK: - if (pre_kprobes_handler(args->regs)) + if (pre_kprobes_handler(args)) return NOTIFY_STOP; break; case DIE_SS: -- cgit v1.1