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kernel_xiaomi_cepheus/kernel/trace
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Chen Jun 06f629fc20 tracing: Fix a kmemleak false positive in tracing_map 
[ Upstream commit f25667e5980a4333729cac3101e5de1bb851f71a ]

Doing the command:
  echo 'hist:key=common_pid.execname,common_timestamp' > /sys/kernel/debug/tracing/events/xxx/trigger

Triggers many kmemleak reports:

unreferenced object 0xffff0000c7ea4980 (size 128):
  comm "bash", pid 338, jiffies 4294912626 (age 9339.324s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000f3469921>] kmem_cache_alloc_trace+0x4c0/0x6f0
    [<0000000054ca40c3>] hist_trigger_elt_data_alloc+0x140/0x178
    [<00000000633bd154>] tracing_map_init+0x1f8/0x268
    [<000000007e814ab9>] event_hist_trigger_func+0xca0/0x1ad0
    [<00000000bf8520ed>] trigger_process_regex+0xd4/0x128
    [<00000000f549355a>] event_trigger_write+0x7c/0x120
    [<00000000b80f898d>] vfs_write+0xc4/0x380
    [<00000000823e1055>] ksys_write+0x74/0xf8
    [<000000008a9374aa>] __arm64_sys_write+0x24/0x30
    [<0000000087124017>] do_el0_svc+0x88/0x1c0
    [<00000000efd0dcd1>] el0_svc+0x1c/0x28
    [<00000000dbfba9b3>] el0_sync_handler+0x88/0xc0
    [<00000000e7399680>] el0_sync+0x148/0x180
unreferenced object 0xffff0000c7ea4980 (size 128):
  comm "bash", pid 338, jiffies 4294912626 (age 9339.324s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000f3469921>] kmem_cache_alloc_trace+0x4c0/0x6f0
    [<0000000054ca40c3>] hist_trigger_elt_data_alloc+0x140/0x178
    [<00000000633bd154>] tracing_map_init+0x1f8/0x268
    [<000000007e814ab9>] event_hist_trigger_func+0xca0/0x1ad0
    [<00000000bf8520ed>] trigger_process_regex+0xd4/0x128
    [<00000000f549355a>] event_trigger_write+0x7c/0x120
    [<00000000b80f898d>] vfs_write+0xc4/0x380
    [<00000000823e1055>] ksys_write+0x74/0xf8
    [<000000008a9374aa>] __arm64_sys_write+0x24/0x30
    [<0000000087124017>] do_el0_svc+0x88/0x1c0
    [<00000000efd0dcd1>] el0_svc+0x1c/0x28
    [<00000000dbfba9b3>] el0_sync_handler+0x88/0xc0
    [<00000000e7399680>] el0_sync+0x148/0x180

The reason is elts->pages[i] is alloced by get_zeroed_page.
and kmemleak will not scan the area alloced by get_zeroed_page.
The address stored in elts->pages will be regarded as leaked.

That is, the elts->pages[i] will have pointers loaded onto it as well, and
without telling kmemleak about it, those pointers will look like memory
without a reference.

To fix this, call kmemleak_alloc to tell kmemleak to scan elts->pages[i]

Link: https://lkml.kernel.org/r/20211124140801.87121-1-chenjun102@huawei.com

Signed-off-by: Chen Jun <chenjun102@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-12-22 09:17:58 +01:00
..
blktrace.c
blktrace: Fix uaf in blk_trace access after removing by sysfs
2021-10-06 15:05:06 +02:00
bpf_trace.c
bpf: fix check of allowed specifiers in bpf_trace_printk
2018-12-17 09:28:50 +01:00
ftrace.c
tracing: Have all levels of checks prevent recursion
2021-10-27 09:51:41 +02:00
Kconfig
Stop the ad-hoc games with -Wno-maybe-initialized
2020-05-20 08:17:10 +02:00
Makefile
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
power-traces.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ring_buffer_benchmark.c
ring-buffer: Have ring_buffer_alloc_read_page() return error on offline CPU
2017-08-02 14:23:02 -04:00
ring_buffer.c
tracing: Fix bug in rb_per_cpu_empty() that might cause deadloop.
2021-07-28 11:12:19 +02:00
rpm-traces.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_benchmark.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_benchmark.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_branch.c
Revert "x86/uaccess, ftrace: Fix ftrace_likely_update() vs. SMAP"
2019-07-03 13:15:57 +02:00
trace_clock.c
tracing: Do no increment trace_clock_global() by one
2021-06-30 08:48:53 -04:00
trace_entries.h
tracing: Set kernel_stack's caller size properly
2020-10-01 13:12:32 +02:00
trace_event_perf.c
perf/ftrace: Fix double traces of perf on ftrace:function
2017-08-29 13:29:29 +02:00
trace_events_filter_test.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_events_filter.c
tracing: Fix regex_match_front() to not over compare the test string
2018-05-16 10:10:27 +02:00
trace_events_hist.c
tracing: Do not reference char * as a string in histograms
2021-07-20 16:17:48 +02:00
trace_events_trigger.c
tracing: Fix event trigger to accept redundant spaces
2020-06-30 15:38:08 -04:00
trace_events.c
tracing: Check pid filtering when creating events
2021-12-08 08:46:49 +01:00
trace_export.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_functions_graph.c
tracing/fgraph: Fix set_graph_function from showing interrupts
2019-05-16 19:42:27 +02:00
trace_functions.c
tracing: Have all levels of checks prevent recursion
2021-10-27 09:51:41 +02:00
trace_hwlat.c
tracing/hwlat: Honor the tracing_cpumask
2020-08-21 09:48:19 +02:00
trace_irqsoff.c
tracing/fgraph: Fix set_graph_function from showing interrupts
2019-05-16 19:42:27 +02:00
trace_kdb.c
tracing: Silence GCC 9 array bounds warning
2019-06-25 11:36:50 +08:00
trace_kprobe.c
ftrace/kprobe: Show the maxactive number on kprobe_events
2020-04-24 08:00:50 +02:00
trace_mmiotrace.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_nop.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_output.c
tracing: Reorder display of TGID to be after PID
2018-07-17 11:39:30 +02:00
trace_output.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_printk.c
…
trace_probe.c
tracing: probeevent: Fix to support minus offset from symbol
2018-03-28 18:24:42 +02:00
trace_probe.h
tracing: probeevent: Fix to support minus offset from symbol
2018-03-28 18:24:42 +02:00
trace_sched_switch.c
tracing: Fix sched switch start/stop refcount racy updates
2020-02-14 16:32:07 -05:00
trace_sched_wakeup.c
kernel/trace: Fix do not unregister tracepoints when register sched_migrate_task fail
2020-01-14 20:05:40 +01:00
trace_selftest_dynamic.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_selftest.c
ftrace: Handle tracing when switching between context
2020-11-10 10:29:04 +01:00
trace_seq.c
…
trace_stack.c
tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not defined
2020-01-14 20:05:40 +01:00
trace_stat.c
tracing: Fix very unlikely race of registering two stat tracers
2020-02-28 16:35:58 +01:00
trace_stat.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_syscalls.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
trace_uprobe.c
tracing/uprobes: Fix output for multiple string arguments
2019-02-20 10:20:53 +01:00
trace.c
tracing: Resize tgid_map to pid_max, not PID_MAX_DEFAULT
2021-11-26 11:40:37 +01:00
trace.h
tracing: Fix pid filtering when triggers are attached
2021-12-08 08:46:48 +01:00
tracing_map.c
tracing: Fix a kmemleak false positive in tracing_map
2021-12-22 09:17:58 +01:00
tracing_map.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00