From: George Guo <guodongtai@xxxxxxxxxx>
The destroy_synth_var_refs() destroyed hist_data, casusing a double-free
error flagged by KASAN.
This is tested via "./ftracetest test.d/trigger/inter-event/
trigger-field-variable-support.tc"
==================================================================
BUG: KASAN: use-after-free in destroy_hist_field+0x115/0x140
Read of size 4 at addr ffff888012e95318 by task ftracetest/1858
CPU: 1 PID: 1858 Comm: ftracetest Kdump: loaded Tainted: GE 4.19.90-89 #24
Source Version: Unknown
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0
Call Trace:
dump_stack+0xcb/0x10b
print_address_description.cold+0x54/0x249
kasan_report_error.cold+0x63/0xab
? destroy_hist_field+0x115/0x140
__asan_report_load4_noabort+0x8d/0xa0
? destroy_hist_field+0x115/0x140
destroy_hist_field+0x115/0x140
destroy_hist_data+0x4e4/0x9a0
event_hist_trigger_free+0x212/0x2f0
? update_cond_flag+0x128/0x170
? event_hist_trigger_func+0x2880/0x2880
hist_unregister_trigger+0x2f2/0x4f0
event_hist_trigger_func+0x168c/0x2880
? tracing_map_read_var_once+0xd0/0xd0
? create_key_field+0x520/0x520
? __mutex_lock_slowpath+0x10/0x10
event_trigger_write+0x2f4/0x490
? trigger_start+0x180/0x180
? __fget_light+0x369/0x5d0
? count_memcg_event_mm+0x104/0x2b0
? trigger_start+0x180/0x180
__vfs_write+0x81/0x100
vfs_write+0x1e1/0x540
ksys_write+0x12a/0x290
? __ia32_sys_read+0xb0/0xb0
? __close_fd+0x1d3/0x280
do_syscall_64+0xe3/0x2d0
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7efdd342ee04
Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b3 0f 1f 80 00 00 00 00 48
8d 05 39 34 0c 00 8b 00 85 c0 75 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff
ff 77 54 f3 c3 66 90 41 54 55 49 89 d4 53 48 89 f5
RSP: 002b:00007ffda01f5e08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000000000b4 RCX: 00007efdd342ee04
RDX: 00000000000000b4 RSI: 000055c5b41b1e90 RDI: 0000000000000001
RBP: 000055c5b41b1e90 R08: 000000000000000a R09: 0000000000000000
R10: 000000000000000a R11: 0000000000000246 R12: 00007efdd34ed5c0
R13: 00000000000000b4 R14: 00007efdd34ed7c0 R15: 00000000000000b4
==================================================================
So remove the destroy_synth_var_refs() call for that hist_data.
Fixes: c282a386a397("tracing: Add 'onmatch' hist trigger action support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: George Guo <guodongtai@xxxxxxxxxx>
---
kernel/trace/trace_events_hist.c | 23 ++---------------------
1 file changed, 2 insertions(+), 21 deletions(-)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index e004daf8cad5..7dcb96305e56 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -280,8 +280,6 @@ struct hist_trigger_data {
struct action_data *actions[HIST_ACTIONS_MAX];
unsigned int n_actions;
- struct hist_field *synth_var_refs[SYNTH_FIELDS_MAX];
- unsigned int n_synth_var_refs;
struct field_var *field_vars[SYNTH_FIELDS_MAX];
unsigned int n_field_vars;
unsigned int n_field_var_str;
@@ -1363,8 +1361,8 @@ static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
return found;
}
- for (i = 0; i < hist_data->n_synth_var_refs; i++) {
- hist_field = hist_data->synth_var_refs[i];
+ for (i = 0; i < hist_data->n_var_refs; i++) {
+ hist_field = hist_data->var_refs[i];
found = check_field_for_var_refs(hist_data, hist_field,
var_data, var_idx, 0);
if (found)
@@ -3707,21 +3705,6 @@ static void save_field_var(struct hist_trigger_data *hist_data,
hist_data->n_field_var_str++;
}
-
-static void destroy_synth_var_refs(struct hist_trigger_data *hist_data)
-{
- unsigned int i;
-
- for (i = 0; i < hist_data->n_synth_var_refs; i++)
- destroy_hist_field(hist_data->synth_var_refs[i], 0);
-}
-
-static void save_synth_var_ref(struct hist_trigger_data *hist_data,
- struct hist_field *var_ref)
-{
- hist_data->synth_var_refs[hist_data->n_synth_var_refs++] = var_ref;
-}
-
static int check_synth_field(struct synth_event *event,
struct hist_field *hist_field,
unsigned int field_pos)
@@ -3884,7 +3867,6 @@ static int onmatch_create(struct hist_trigger_data *hist_data,
goto err;
}
- save_synth_var_ref(hist_data, var_ref);
field_pos++;
kfree(p);
continue;
@@ -4631,7 +4613,6 @@ static void destroy_hist_data(struct hist_trigger_data *hist_data)
destroy_actions(hist_data);
destroy_field_vars(hist_data);
destroy_field_var_hists(hist_data);
- destroy_synth_var_refs(hist_data);
kfree(hist_data);
}
--
2.34.1
