linux-kernel - [PATCH v1 1/4] perf record: Delete session after stopping sideband thread

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Date: Thu, 29 Feb 2024 23:46:36 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Christian Brauner <brauner@...nel.org>, James Clark <james.clark@....com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Tim Chen <tim.c.chen@...ux.intel.com>, 
	Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, Yicong Yang <yangyicong@...ilicon.com>, 
	Kajol Jain <kjain@...ux.ibm.com>, Disha Goel <disgoel@...ux.ibm.com>, 
	K Prateek Nayak <kprateek.nayak@....com>, Song Liu <songliubraving@...com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	bpf@...r.kernel.org
Subject: [PATCH v1 1/4] perf record: Delete session after stopping sideband thread

The session has a header in it which contains a perf env with
bpf_progs. The bpf_progs are accessed by the sideband thread and so
the sideband thread must be stopped before the session is deleted, to
avoid a use after free.  This error was detected by AddressSanitizer
in the following:

```
==2054673==ERROR: AddressSanitizer: heap-use-after-free on address 0x61d000161e00 at pc 0x55769289de54 bp 0x7f9df36d4ab0 sp 0x7f9df36d4aa8
READ of size 8 at 0x61d000161e00 thread T1
    #0 0x55769289de53 in __perf_env__insert_bpf_prog_info util/env.c:42
    #1 0x55769289dbb1 in perf_env__insert_bpf_prog_info util/env.c:29
    #2 0x557692bbae29 in perf_env__add_bpf_info util/bpf-event.c:483
    #3 0x557692bbb01a in bpf_event__sb_cb util/bpf-event.c:512
    #4 0x5576928b75f4 in perf_evlist__poll_thread util/sideband_evlist.c:68
    #5 0x7f9df96a63eb in start_thread nptl/pthread_create.c:444
    #6 0x7f9df9726a4b in clone3 ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

0x61d000161e00 is located 384 bytes inside of 2136-byte region [0x61d000161c80,0x61d0001624d8)
freed by thread T0 here:
    #0 0x7f9dfa6d7288 in __interceptor_free libsanitizer/asan/asan_malloc_linux.cpp:52
    #1 0x557692978d50 in perf_session__delete util/session.c:319
    #2 0x557692673959 in __cmd_record tools/perf/builtin-record.c:2884
    #3 0x55769267a9f0 in cmd_record tools/perf/builtin-record.c:4259
    #4 0x55769286710c in run_builtin tools/perf/perf.c:349
    #5 0x557692867678 in handle_internal_command tools/perf/perf.c:402
    #6 0x557692867a40 in run_argv tools/perf/perf.c:446
    #7 0x557692867fae in main tools/perf/perf.c:562
    #8 0x7f9df96456c9 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
```

Fixes: 657ee5531903 ("perf evlist: Introduce side band thread")
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-record.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 92ccca9574ca..32df34dda9cd 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -2881,10 +2881,10 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 	}
 #endif
 	zstd_fini(&session->zstd_data);
-	perf_session__delete(session);
-
 	if (!opts->no_bpf_event)
 		evlist__stop_sb_thread(rec->sb_evlist);
+
+	perf_session__delete(session);
 	return status;
 }
 
-- 
2.44.0.278.ge034bb2e1d-goog