diff options
| author | Keshavamurthy Anil S <anil.s.keshavamurthy@intel.com> | 2005-06-23 09:09:35 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-23 18:45:24 +0200 |
| commit | 89cb14c0dd0e4a7d0315d19f449389c4d49237ee (patch) | |
| tree | 795e52fd30c5236c365be7a3eaedb316e5c8cad5 | |
| parent | [PATCH] Kprobes IA64: safe register kprobe (diff) | |
| download | linux-89cb14c0dd0e4a7d0315d19f449389c4d49237ee.tar.xz linux-89cb14c0dd0e4a7d0315d19f449389c4d49237ee.zip | |
[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 <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | arch/ia64/kernel/kprobes.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c index 027d656664d2..41e80b42d3f3 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: |