From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x225bCMEQCZnmuaDE/j/lmQ5ssXmS3quUbIZDVvRIBMAORLm/iCaw6hArG4+NLgDjOOY6lpyG ARC-Seal: i=1; a=rsa-sha256; t=1519788024; cv=none; d=google.com; s=arc-20160816; b=k9QztKxNAbKTeEeYfQEq31u41yhv3RI0gwjdQnn4dii4WQlu36C14vON4MwIhePdU9 Nc+XFfiUj5aw6P2gUwYVrSGWA2Xd28YAlvQblXa9bo9fgv8nFHyDsSi1rBoBNmezCGia vUUoWxuqD7OLkH/n3KjXm0fSGlJeukffGuaVlY09y0CvkEbMOEEWY0Qca9w8Iyd0+Hyd Br/txJU9yO8B7isqXRWl3nTpiNDOqhAaT838u0N98CfTXF5JelaEdEZEm2nQq/wowomS x+Fv4rhatIEPgZXOWVNRRhXiridbtK8NMgloHhuHGvB4IAduC1ERNJifSO/01raNVb6R jb5A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :user-agent:references:in-reply-to:message-id:date:subject:cc:to :from:dmarc-filter:arc-authentication-results; bh=3Qd+2U2Dt7w/XgXQWAYG7a9WSyN4RIQQNGT3t2bzkG8=; b=RU3+vvB83MD+UjaA1NSrfiXJch1V86jeSBk9cbSD9UhO4F1vDwPqcFuCyptMjxk0qk M6UJYoBymA88VKnxbE2w8pyVP7HtiMwnPH0niRyeBOqwAR80oe925x8yl4FgUxYycGeu OVivfasuJkBZWxTuCbU56Iu/SK4JUHI4ZYOTVyp1cWXkbKBZar6Na+Pdd+8pS4RGzoij CGd/4BXL8DK6GaB4eAt8R5NsgOvPklOH41JJLzwjygkI+z3MpX1hbrxAAxN6ImueJTTZ s1bIDx9I5B0qmA99rY2n3K6kdWvkA3dfvIC4PDkmsiLpas5I2tsvDdOF+AMztu7iWVOv U8cw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kselftest-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kselftest-owner@vger.kernel.org Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kselftest-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kselftest-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751761AbeB1DUX (ORCPT ); Tue, 27 Feb 2018 22:20:23 -0500 Received: from mail.kernel.org ([198.145.29.99]:55876 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751706AbeB1DUX (ORCPT ); Tue, 27 Feb 2018 22:20:23 -0500 DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EF6142168D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=mhiramat@kernel.org From: Masami Hiramatsu To: Steven Rostedt , linux-kernel@vger.kernel.org Cc: mhiramat@kernel.org, Ingo Molnar , Namhyung Kim , Tom Zanussi , Arnaldo Carvalho de Melo , linux-trace-users@vger.kernel.org, linux-kselftest@vger.kernel.org, shuah@kernel.org Subject: [PATCH v4 01/19] [BUGFIX] tracing: probeevent: Fix to support minus offset from symbol Date: Wed, 28 Feb 2018 12:19:53 +0900 Message-Id: <151978799370.2577.9456049827647614166.stgit@devbox> X-Mailer: git-send-email 2.13.6 In-Reply-To: <151978796240.2577.6531711990653677529.stgit@devbox> References: <151978796240.2577.6531711990653677529.stgit@devbox> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kselftest-owner@vger.kernel.org X-Mailing-List: linux-kselftest@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1593613247827918493?= X-GMAIL-MSGID: =?utf-8?q?1593613247827918493?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: In Documentation/trace/kprobetrace.txt, it says @SYM[+|-offs] : Fetch memory at SYM +|- offs (SYM should be a data symbol) However, the parser doesn't parse minus offset correctly, since commit 2fba0c8867af ("tracing/kprobes: Fix probe offset to be unsigned") drops minus ("-") offset support for kprobe probe address usage. This fixes the traceprobe_split_symbol_offset() to parse minus offset again with checking the offset range, and add a minus offset check in kprobe probe address usage. Fixes: 2fba0c8867af ("tracing/kprobes: Fix probe offset to be unsigned") Signed-off-by: Masami Hiramatsu --- Changes in v3: - Use kstrtol instead of kstrtoul. (Thanks Namhyung!) Changes in v4: - Fix to decode sign. (Thanks Namhyung!) - Fix to check UINT_MAX for kprobe offset. --- kernel/trace/trace_kprobe.c | 4 ++-- kernel/trace/trace_probe.c | 8 +++----- kernel/trace/trace_probe.h | 2 +- 3 files changed, 6 insertions(+), 8 deletions(-) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 5ce9b8cf7be3..1cd3fb4d70f8 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -667,7 +667,7 @@ static int create_trace_kprobe(int argc, char **argv) char *symbol = NULL, *event = NULL, *group = NULL; int maxactive = 0; char *arg; - unsigned long offset = 0; + long offset = 0; void *addr = NULL; char buf[MAX_EVENT_NAME_LEN]; @@ -755,7 +755,7 @@ static int create_trace_kprobe(int argc, char **argv) symbol = argv[1]; /* TODO: support .init module functions */ ret = traceprobe_split_symbol_offset(symbol, &offset); - if (ret) { + if (ret || offset < 0 || offset > UINT_MAX) { pr_info("Failed to parse either an address or a symbol.\n"); return ret; } diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index d59357308677..daf54bda4dc8 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -320,7 +320,7 @@ static fetch_func_t get_fetch_size_function(const struct fetch_type *type, } /* Split symbol and offset. */ -int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset) +int traceprobe_split_symbol_offset(char *symbol, long *offset) { char *tmp; int ret; @@ -328,13 +328,11 @@ int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset) if (!offset) return -EINVAL; - tmp = strchr(symbol, '+'); + tmp = strpbrk(symbol, "+-"); if (tmp) { - /* skip sign because kstrtoul doesn't accept '+' */ - ret = kstrtoul(tmp + 1, 0, offset); + ret = kstrtol(tmp, 0, offset); if (ret) return ret; - *tmp = '\0'; } else *offset = 0; diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h index 0745f895f780..75daff22ccea 100644 --- a/kernel/trace/trace_probe.h +++ b/kernel/trace/trace_probe.h @@ -365,7 +365,7 @@ extern int traceprobe_conflict_field_name(const char *name, extern void traceprobe_update_arg(struct probe_arg *arg); extern void traceprobe_free_probe_arg(struct probe_arg *arg); -extern int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset); +extern int traceprobe_split_symbol_offset(char *symbol, long *offset); /* Sum up total data length for dynamic arraies (strings) */ static nokprobe_inline int