* [PATCH] perf sched: Fix memory leaks in __cmd_record
@ 2022-08-24 4:38 Ian Rogers
2022-08-24 13:37 ` Arnaldo Carvalho de Melo
0 siblings, 1 reply; 3+ messages in thread
From: Ian Rogers @ 2022-08-24 4:38 UTC (permalink / raw)
To: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim,
linux-perf-users, linux-kernel
Cc: Stephane Eranian, Ian Rogers
An array of strings is passed to cmd_record but not freed. As
cmd_record modifies the array, add another array as a copy that can be
mutated allowing the original array contents to all be freed.
Detected with -fsanitize=address.
Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/builtin-sched.c | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 2f6cd1b8b662..59ba14d2321c 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -3355,7 +3355,8 @@ static bool schedstat_events_exposed(void)
static int __cmd_record(int argc, const char **argv)
{
unsigned int rec_argc, i, j;
- const char **rec_argv;
+ char **rec_argv;
+ const char **rec_argv_copy;
const char * const record_args[] = {
"record",
"-a",
@@ -3384,6 +3385,7 @@ static int __cmd_record(int argc, const char **argv)
ARRAY_SIZE(schedstat_args) : 0;
struct tep_event *waking_event;
+ int ret;
/*
* +2 for either "-e", "sched:sched_wakeup" or
@@ -3391,14 +3393,15 @@ static int __cmd_record(int argc, const char **argv)
*/
rec_argc = ARRAY_SIZE(record_args) + 2 + schedstat_argc + argc - 1;
rec_argv = calloc(rec_argc + 1, sizeof(char *));
+ rec_argv_copy = calloc(rec_argc + 1, sizeof(char *));
- if (rec_argv == NULL)
+ if (rec_argv == NULL || rec_argv_copy == NULL)
return -ENOMEM;
for (i = 0; i < ARRAY_SIZE(record_args); i++)
rec_argv[i] = strdup(record_args[i]);
- rec_argv[i++] = "-e";
+ rec_argv[i++] = strdup("-e");
waking_event = trace_event__tp_format("sched", "sched_waking");
if (!IS_ERR(waking_event))
rec_argv[i++] = strdup("sched:sched_waking");
@@ -3409,11 +3412,19 @@ static int __cmd_record(int argc, const char **argv)
rec_argv[i++] = strdup(schedstat_args[j]);
for (j = 1; j < (unsigned int)argc; j++, i++)
- rec_argv[i] = argv[j];
+ rec_argv[i] = strdup(argv[j]);
BUG_ON(i != rec_argc);
- return cmd_record(i, rec_argv);
+ memcpy(rec_argv_copy, rec_argv, sizeof(char*) * rec_argc);
+ ret = cmd_record(rec_argc, rec_argv_copy);
+
+ for (i = 0; i < rec_argc; i++)
+ free(rec_argv[i]);
+ free(rec_argv);
+ free(rec_argv_copy);
+
+ return ret;
}
int cmd_sched(int argc, const char **argv)
--
2.37.2.609.g9ff673ca1a-goog
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] perf sched: Fix memory leaks in __cmd_record
2022-08-24 4:38 [PATCH] perf sched: Fix memory leaks in __cmd_record Ian Rogers
@ 2022-08-24 13:37 ` Arnaldo Carvalho de Melo
2022-08-24 14:59 ` Ian Rogers
0 siblings, 1 reply; 3+ messages in thread
From: Arnaldo Carvalho de Melo @ 2022-08-24 13:37 UTC (permalink / raw)
To: Ian Rogers
Cc: Peter Zijlstra, Ingo Molnar, Mark Rutland, Alexander Shishkin,
Jiri Olsa, Namhyung Kim, linux-perf-users, linux-kernel,
Stephane Eranian
Em Tue, Aug 23, 2022 at 09:38:25PM -0700, Ian Rogers escreveu:
> An array of strings is passed to cmd_record but not freed. As
> cmd_record modifies the array, add another array as a copy that can be
> mutated allowing the original array contents to all be freed.
>
> Detected with -fsanitize=address.
>
> Signed-off-by: Ian Rogers <irogers@google.com>
> ---
> tools/perf/builtin-sched.c | 21 ++++++++++++++++-----
> 1 file changed, 16 insertions(+), 5 deletions(-)
>
> diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
> index 2f6cd1b8b662..59ba14d2321c 100644
> --- a/tools/perf/builtin-sched.c
> +++ b/tools/perf/builtin-sched.c
> @@ -3355,7 +3355,8 @@ static bool schedstat_events_exposed(void)
> static int __cmd_record(int argc, const char **argv)
> {
> unsigned int rec_argc, i, j;
> - const char **rec_argv;
> + char **rec_argv;
> + const char **rec_argv_copy;
> const char * const record_args[] = {
> "record",
> "-a",
> @@ -3384,6 +3385,7 @@ static int __cmd_record(int argc, const char **argv)
> ARRAY_SIZE(schedstat_args) : 0;
>
> struct tep_event *waking_event;
> + int ret;
>
> /*
> * +2 for either "-e", "sched:sched_wakeup" or
> @@ -3391,14 +3393,15 @@ static int __cmd_record(int argc, const char **argv)
> */
> rec_argc = ARRAY_SIZE(record_args) + 2 + schedstat_argc + argc - 1;
> rec_argv = calloc(rec_argc + 1, sizeof(char *));
> + rec_argv_copy = calloc(rec_argc + 1, sizeof(char *));
>
> - if (rec_argv == NULL)
> + if (rec_argv == NULL || rec_argv_copy == NULL)
> return -ENOMEM;
Here you´re leaking rec_argv if rec_argv_copy fails to be allocated, no?
- Arnaldo
>
> for (i = 0; i < ARRAY_SIZE(record_args); i++)
> rec_argv[i] = strdup(record_args[i]);
>
> - rec_argv[i++] = "-e";
> + rec_argv[i++] = strdup("-e");
> waking_event = trace_event__tp_format("sched", "sched_waking");
> if (!IS_ERR(waking_event))
> rec_argv[i++] = strdup("sched:sched_waking");
> @@ -3409,11 +3412,19 @@ static int __cmd_record(int argc, const char **argv)
> rec_argv[i++] = strdup(schedstat_args[j]);
>
> for (j = 1; j < (unsigned int)argc; j++, i++)
> - rec_argv[i] = argv[j];
> + rec_argv[i] = strdup(argv[j]);
>
> BUG_ON(i != rec_argc);
>
> - return cmd_record(i, rec_argv);
> + memcpy(rec_argv_copy, rec_argv, sizeof(char*) * rec_argc);
> + ret = cmd_record(rec_argc, rec_argv_copy);
> +
> + for (i = 0; i < rec_argc; i++)
> + free(rec_argv[i]);
> + free(rec_argv);
> + free(rec_argv_copy);
> +
> + return ret;
> }
>
> int cmd_sched(int argc, const char **argv)
> --
> 2.37.2.609.g9ff673ca1a-goog
--
- Arnaldo
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] perf sched: Fix memory leaks in __cmd_record
2022-08-24 13:37 ` Arnaldo Carvalho de Melo
@ 2022-08-24 14:59 ` Ian Rogers
0 siblings, 0 replies; 3+ messages in thread
From: Ian Rogers @ 2022-08-24 14:59 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo
Cc: Peter Zijlstra, Ingo Molnar, Mark Rutland, Alexander Shishkin,
Jiri Olsa, Namhyung Kim, linux-perf-users, linux-kernel,
Stephane Eranian
On Wed, Aug 24, 2022 at 6:37 AM Arnaldo Carvalho de Melo
<acme@kernel.org> wrote:
>
> Em Tue, Aug 23, 2022 at 09:38:25PM -0700, Ian Rogers escreveu:
> > An array of strings is passed to cmd_record but not freed. As
> > cmd_record modifies the array, add another array as a copy that can be
> > mutated allowing the original array contents to all be freed.
> >
> > Detected with -fsanitize=address.
> >
> > Signed-off-by: Ian Rogers <irogers@google.com>
> > ---
> > tools/perf/builtin-sched.c | 21 ++++++++++++++++-----
> > 1 file changed, 16 insertions(+), 5 deletions(-)
> >
> > diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
> > index 2f6cd1b8b662..59ba14d2321c 100644
> > --- a/tools/perf/builtin-sched.c
> > +++ b/tools/perf/builtin-sched.c
> > @@ -3355,7 +3355,8 @@ static bool schedstat_events_exposed(void)
> > static int __cmd_record(int argc, const char **argv)
> > {
> > unsigned int rec_argc, i, j;
> > - const char **rec_argv;
> > + char **rec_argv;
> > + const char **rec_argv_copy;
> > const char * const record_args[] = {
> > "record",
> > "-a",
> > @@ -3384,6 +3385,7 @@ static int __cmd_record(int argc, const char **argv)
> > ARRAY_SIZE(schedstat_args) : 0;
> >
> > struct tep_event *waking_event;
> > + int ret;
> >
> > /*
> > * +2 for either "-e", "sched:sched_wakeup" or
> > @@ -3391,14 +3393,15 @@ static int __cmd_record(int argc, const char **argv)
> > */
> > rec_argc = ARRAY_SIZE(record_args) + 2 + schedstat_argc + argc - 1;
> > rec_argv = calloc(rec_argc + 1, sizeof(char *));
> > + rec_argv_copy = calloc(rec_argc + 1, sizeof(char *));
> >
> > - if (rec_argv == NULL)
> > + if (rec_argv == NULL || rec_argv_copy == NULL)
> > return -ENOMEM;
>
> Here you´re leaking rec_argv if rec_argv_copy fails to be allocated, no?
Done in v2.
Thanks,
Ian
> - Arnaldo
>
> >
> > for (i = 0; i < ARRAY_SIZE(record_args); i++)
> > rec_argv[i] = strdup(record_args[i]);
> >
> > - rec_argv[i++] = "-e";
> > + rec_argv[i++] = strdup("-e");
> > waking_event = trace_event__tp_format("sched", "sched_waking");
> > if (!IS_ERR(waking_event))
> > rec_argv[i++] = strdup("sched:sched_waking");
> > @@ -3409,11 +3412,19 @@ static int __cmd_record(int argc, const char **argv)
> > rec_argv[i++] = strdup(schedstat_args[j]);
> >
> > for (j = 1; j < (unsigned int)argc; j++, i++)
> > - rec_argv[i] = argv[j];
> > + rec_argv[i] = strdup(argv[j]);
> >
> > BUG_ON(i != rec_argc);
> >
> > - return cmd_record(i, rec_argv);
> > + memcpy(rec_argv_copy, rec_argv, sizeof(char*) * rec_argc);
> > + ret = cmd_record(rec_argc, rec_argv_copy);
> > +
> > + for (i = 0; i < rec_argc; i++)
> > + free(rec_argv[i]);
> > + free(rec_argv);
> > + free(rec_argv_copy);
> > +
> > + return ret;
> > }
> >
> > int cmd_sched(int argc, const char **argv)
> > --
> > 2.37.2.609.g9ff673ca1a-goog
>
> --
>
> - Arnaldo
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-08-24 4:38 [PATCH] perf sched: Fix memory leaks in __cmd_record Ian Rogers
2022-08-24 13:37 ` Arnaldo Carvalho de Melo
2022-08-24 14:59 ` Ian Rogers
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