From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752786Ab3LPEc2 (ORCPT ); Sun, 15 Dec 2013 23:32:28 -0500 Received: from lgeamrelo02.lge.com ([156.147.1.126]:47856 "EHLO LGEAMRELO02.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752502Ab3LPEcX (ORCPT ); Sun, 15 Dec 2013 23:32:23 -0500 X-AuditID: 9c93017e-b7c17ae000003961-2f-52ae82535262 From: Namhyung Kim To: Steven Rostedt , Oleg Nesterov Cc: Masami Hiramatsu , Srikar Dronamraju , Hyeoncheol Lee , "zhangwei(Jovi)" , Arnaldo Carvalho de Melo , Hemant Kumar , LKML , Namhyung Kim Subject: [PATCH 11/17] tracing/probes: Add fetch{,_size} member into deref fetch method Date: Mon, 16 Dec 2013 13:32:10 +0900 Message-Id: <1387168336-13213-12-git-send-email-namhyung@kernel.org> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1387168336-13213-1-git-send-email-namhyung@kernel.org> References: <1387168336-13213-1-git-send-email-namhyung@kernel.org> X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Hyeoncheol Lee The deref fetch methods access a memory region but it assumes that it's a kernel memory since uprobes does not support them. Add ->fetch and ->fetch_size member in order to provide a proper access methods for supporting uprobes. Acked-by: Masami Hiramatsu Cc: Srikar Dronamraju Cc: Oleg Nesterov Cc: zhangwei(Jovi) Cc: Arnaldo Carvalho de Melo Signed-off-by: Hyeoncheol Lee [namhyung@kernel.org: Split original patch into pieces as requested] Signed-off-by: Namhyung Kim --- kernel/trace/trace_probe.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index a31ad478b7f6..8d7231d436da 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -184,6 +184,8 @@ __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs, struct deref_fetch_param { struct fetch_param orig; long offset; + fetch_func_t fetch; + fetch_func_t fetch_size; }; #define DEFINE_FETCH_deref(type) \ @@ -195,13 +197,26 @@ __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs, \ call_fetch(&dprm->orig, regs, &addr); \ if (addr) { \ addr += dprm->offset; \ - fetch_memory_##type(regs, (void *)addr, dest); \ + dprm->fetch(regs, (void *)addr, dest); \ } else \ *(type *)dest = 0; \ } DEFINE_BASIC_FETCH_FUNCS(deref) DEFINE_FETCH_deref(string) -DEFINE_FETCH_deref(string_size) + +__kprobes void FETCH_FUNC_NAME(deref, string_size)(struct pt_regs *regs, + void *data, void *dest) +{ + struct deref_fetch_param *dprm = data; + unsigned long addr; + + call_fetch(&dprm->orig, regs, &addr); + if (addr && dprm->fetch_size) { + addr += dprm->offset; + dprm->fetch_size(regs, (void *)addr, dest); + } else + *(string_size *)dest = 0; +} static __kprobes void update_deref_fetch_param(struct deref_fetch_param *data) { @@ -477,6 +492,9 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t, return -ENOMEM; dprm->offset = offset; + dprm->fetch = t->fetch[FETCH_MTD_memory]; + dprm->fetch_size = get_fetch_size_function(t, + dprm->fetch, ftbl); ret = parse_probe_arg(arg, t2, &dprm->orig, is_return, is_kprobe); if (ret) -- 1.7.11.7