Messages in this thread Patch in this message | | | From | 平松雅巳 / HIRAMATU,MASAMI <> | Subject | RE: [PATCH v2] perf probe: Verify parameters for two functions | Date | Fri, 6 Nov 2015 10:03:31 +0000 |
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From: Wang Nan [mailto:wangnan0@huawei.com] > >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.
Looks good to me ! :)
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Thank you!
> >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; >-- >1.8.3.4
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