linux-kernel - Re: [PATCH v2] perf probe: Verify parameters for two functions

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Date:	Wed, 11 Nov 2015 15:00:42 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	<acme@...nel.org>
CC:	<namhyung@...nel.org>, <lizefan@...wei.com>, <pi3orama@....com>,
	<linux-kernel@...r.kernel.org>, <jolsa@...nel.org>,
	<masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH v2] perf probe: Verify parameters for two functions

Hi Arnaldo,

Could you please collect this patch to your tree? It fixes a segfault
when only one of kprobe and uprobe is enabled.

Thank you.

On 2015/11/6 17:50, Wang Nan wrote:
> On kernel with only one of CONFIG_KPROBE_EVENTS and
> CONFIG_UPROBE_EVENTS enabled, 'perf probe -d' causes segfault because
> perf_del_probe_events() calls probe_file__get_events() with a negative
> fd.
>
> This patch fixes it by add parameter validation at the entry of
> probe_file__get_events() and probe_file__get_rawlist(). Since they are
> both non-static public functions (in .h file), parameter verifying
> is required.
>
> v1 -> v2: Verify fd at the head of probe_file__get_rawlist() instead of
>            checking at call site (suggested by Masami and Arnaldo at [1,2]).
>
> [1] http://lkml.kernel.org/r/50399556C9727B4D88A595C8584AAB37526048E3@GSjpTKYDCembx32.service.hitachi.net
> [2] http://lkml.kernel.org/r/20151105155830.GV13236@kernel.org
>
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> ---
>   tools/perf/util/probe-file.c | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
> index 89dbeb9..e3b3b92 100644
> --- a/tools/perf/util/probe-file.c
> +++ b/tools/perf/util/probe-file.c
> @@ -138,6 +138,9 @@ struct strlist *probe_file__get_rawlist(int fd)
>   	char *p;
>   	struct strlist *sl;
>   
> +	if (fd < 0)
> +		return NULL;
> +
>   	sl = strlist__new(NULL, NULL);
>   
>   	fp = fdopen(dup(fd), "r");
> @@ -271,6 +274,9 @@ int probe_file__get_events(int fd, struct strfilter *filter,
>   	const char *p;
>   	int ret = -ENOENT;
>   
> +	if (!plist)
> +		return -EINVAL;
> +
>   	namelist = __probe_file__get_namelist(fd, true);
>   	if (!namelist)
>   		return -ENOENT;


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