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SubjectRe: [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@huawei.com>
> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
> Cc: Jiri Olsa <jolsa@kernel.org>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
> Cc: Namhyung Kim <namhyung@kernel.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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