* [PATCH] tracing: Fix uaf issue when open the hist or hist_debug file
@ 2023-12-12 11:33 Zheng Yejian
2023-12-12 16:35 ` Steven Rostedt
0 siblings, 1 reply; 5+ messages in thread
From: Zheng Yejian @ 2023-12-12 11:33 UTC (permalink / raw)
To: rostedt, mhiramat
Cc: mathieu.desnoyers, linux-kernel, linux-trace-kernel, yeweihua4,
zhengyejian1
KASAN report following issue. The root cause is when opening 'hist'
file of an instance and accessing 'trace_event_file' in hist_show(),
but 'trace_event_file' has been freed due to the instance being removed.
'hist_debug' file has the same problem. To fix it, use
tracing_{open, release}_file_tr() as instead when open these two files.
BUG: KASAN: slab-use-after-free in hist_show+0x11e0/0x1278
Read of size 8 at addr ffff242541e336b8 by task head/190
CPU: 4 PID: 190 Comm: head Not tainted 6.7.0-rc5-g26aff849438c #133
Hardware name: linux,dummy-virt (DT)
Call trace:
dump_backtrace+0x98/0xf8
show_stack+0x1c/0x30
dump_stack_lvl+0x44/0x58
print_report+0xf0/0x5a0
kasan_report+0x80/0xc0
__asan_report_load8_noabort+0x1c/0x28
hist_show+0x11e0/0x1278
seq_read_iter+0x344/0xd78
seq_read+0x128/0x1c0
vfs_read+0x198/0x6c8
ksys_read+0xf4/0x1e0
__arm64_sys_read+0x70/0xa8
invoke_syscall+0x70/0x260
el0_svc_common.constprop.0+0xb0/0x280
do_el0_svc+0x44/0x60
el0_svc+0x34/0x68
el0t_64_sync_handler+0xb8/0xc0
el0t_64_sync+0x168/0x170
Allocated by task 188:
kasan_save_stack+0x28/0x50
kasan_set_track+0x28/0x38
kasan_save_alloc_info+0x20/0x30
__kasan_slab_alloc+0x6c/0x80
kmem_cache_alloc+0x15c/0x4a8
trace_create_new_event+0x84/0x348
__trace_add_new_event+0x18/0x88
event_trace_add_tracer+0xc4/0x1a0
trace_array_create_dir+0x6c/0x100
trace_array_create+0x2e8/0x568
instance_mkdir+0x48/0x80
tracefs_syscall_mkdir+0x90/0xe8
vfs_mkdir+0x3c4/0x610
do_mkdirat+0x144/0x200
__arm64_sys_mkdirat+0x8c/0xc0
invoke_syscall+0x70/0x260
el0_svc_common.constprop.0+0xb0/0x280
do_el0_svc+0x44/0x60
el0_svc+0x34/0x68
el0t_64_sync_handler+0xb8/0xc0
el0t_64_sync+0x168/0x170
Freed by task 191:
kasan_save_stack+0x28/0x50
kasan_set_track+0x28/0x38
kasan_save_free_info+0x34/0x58
__kasan_slab_free+0xe4/0x158
kmem_cache_free+0x19c/0x508
event_file_put+0xa0/0x120
remove_event_file_dir+0x180/0x320
event_trace_del_tracer+0xb0/0x180
__remove_instance+0x224/0x508
instance_rmdir+0x44/0x78
tracefs_syscall_rmdir+0xbc/0x140
vfs_rmdir+0x1cc/0x4c8
do_rmdir+0x220/0x2b8
__arm64_sys_unlinkat+0xc0/0x100
invoke_syscall+0x70/0x260
el0_svc_common.constprop.0+0xb0/0x280
do_el0_svc+0x44/0x60
el0_svc+0x34/0x68
el0t_64_sync_handler+0xb8/0xc0
el0t_64_sync+0x168/0x170
Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
---
kernel/trace/trace_events_hist.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 1abc07fba1b9..00447ea7dabd 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -5623,10 +5623,12 @@ static int event_hist_open(struct inode *inode, struct file *file)
{
int ret;
- ret = security_locked_down(LOCKDOWN_TRACEFS);
+ ret = tracing_open_file_tr(inode, file);
if (ret)
return ret;
+ /* Clear private_data to avoid warning in single_open */
+ file->private_data = NULL;
return single_open(file, hist_show, file);
}
@@ -5634,7 +5636,7 @@ const struct file_operations event_hist_fops = {
.open = event_hist_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = single_release,
+ .release = tracing_release_file_tr,
};
#ifdef CONFIG_HIST_TRIGGERS_DEBUG
@@ -5900,10 +5902,12 @@ static int event_hist_debug_open(struct inode *inode, struct file *file)
{
int ret;
- ret = security_locked_down(LOCKDOWN_TRACEFS);
+ ret = tracing_open_file_tr(inode, file);
if (ret)
return ret;
+ /* Clear private_data to avoid warning in single_open */
+ file->private_data = NULL;
return single_open(file, hist_debug_show, file);
}
@@ -5911,7 +5915,7 @@ const struct file_operations event_hist_debug_fops = {
.open = event_hist_debug_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = single_release,
+ .release = tracing_release_file_tr,
};
#endif
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] tracing: Fix uaf issue when open the hist or hist_debug file 2023-12-12 11:33 [PATCH] tracing: Fix uaf issue when open the hist or hist_debug file Zheng Yejian @ 2023-12-12 16:35 ` Steven Rostedt 2023-12-13 1:51 ` [PATCH v2] " Zheng Yejian 0 siblings, 1 reply; 5+ messages in thread From: Steven Rostedt @ 2023-12-12 16:35 UTC (permalink / raw) To: Zheng Yejian Cc: mhiramat, mathieu.desnoyers, linux-kernel, linux-trace-kernel, yeweihua4 On Tue, 12 Dec 2023 19:33:17 +0800 Zheng Yejian <zhengyejian1@huawei.com> wrote: > diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c > index 1abc07fba1b9..00447ea7dabd 100644 > --- a/kernel/trace/trace_events_hist.c > +++ b/kernel/trace/trace_events_hist.c > @@ -5623,10 +5623,12 @@ static int event_hist_open(struct inode *inode, struct file *file) > { > int ret; > > - ret = security_locked_down(LOCKDOWN_TRACEFS); > + ret = tracing_open_file_tr(inode, file); > if (ret) > return ret; > > + /* Clear private_data to avoid warning in single_open */ > + file->private_data = NULL; > return single_open(file, hist_show, file); > } > > @@ -5634,7 +5636,7 @@ const struct file_operations event_hist_fops = { > .open = event_hist_open, > .read = seq_read, > .llseek = seq_lseek, > - .release = single_release, > + .release = tracing_release_file_tr, single_release() still needs to be called. This can't simply be replaced with tracing_release_file_tr(). > }; > > #ifdef CONFIG_HIST_TRIGGERS_DEBUG > @@ -5900,10 +5902,12 @@ static int event_hist_debug_open(struct inode *inode, struct file *file) > { > int ret; > > - ret = security_locked_down(LOCKDOWN_TRACEFS); > + ret = tracing_open_file_tr(inode, file); > if (ret) > return ret; > > + /* Clear private_data to avoid warning in single_open */ > + file->private_data = NULL; > return single_open(file, hist_debug_show, file); > } > > @@ -5911,7 +5915,7 @@ const struct file_operations event_hist_debug_fops = { > .open = event_hist_debug_open, > .read = seq_read, > .llseek = seq_lseek, > - .release = single_release, > + .release = tracing_release_file_tr, Same here. This just causes a leak of the single resources. What needs to be done is to add a: tracing_single_release_file_tr() That does both: int tracing_single_release_file_tr(struct inode *inode, struct file *filp) { struct trace_event_file *file = inode->i_private; trace_array_put(file->tr); event_file_put(file); return single_release(inode, filp); } -- Steve > }; > #endif > ^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2] tracing: Fix uaf issue when open the hist or hist_debug file 2023-12-12 16:35 ` Steven Rostedt @ 2023-12-13 1:51 ` Zheng Yejian 2023-12-13 13:01 ` Steven Rostedt 0 siblings, 1 reply; 5+ messages in thread From: Zheng Yejian @ 2023-12-13 1:51 UTC (permalink / raw) To: rostedt Cc: linux-kernel, linux-trace-kernel, mathieu.desnoyers, mhiramat, yeweihua4, zhengyejian1 KASAN report following issue. The root cause is when opening 'hist' file of an instance and accessing 'trace_event_file' in hist_show(), but 'trace_event_file' has been freed due to the instance being removed. 'hist_debug' file has the same problem. To fix it, call tracing_{open,release}_file_tr() in file_operations callback to have the ref count and avoid 'trace_event_file' being freed. BUG: KASAN: slab-use-after-free in hist_show+0x11e0/0x1278 Read of size 8 at addr ffff242541e336b8 by task head/190 CPU: 4 PID: 190 Comm: head Not tainted 6.7.0-rc5-g26aff849438c #133 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x98/0xf8 show_stack+0x1c/0x30 dump_stack_lvl+0x44/0x58 print_report+0xf0/0x5a0 kasan_report+0x80/0xc0 __asan_report_load8_noabort+0x1c/0x28 hist_show+0x11e0/0x1278 seq_read_iter+0x344/0xd78 seq_read+0x128/0x1c0 vfs_read+0x198/0x6c8 ksys_read+0xf4/0x1e0 __arm64_sys_read+0x70/0xa8 invoke_syscall+0x70/0x260 el0_svc_common.constprop.0+0xb0/0x280 do_el0_svc+0x44/0x60 el0_svc+0x34/0x68 el0t_64_sync_handler+0xb8/0xc0 el0t_64_sync+0x168/0x170 Allocated by task 188: kasan_save_stack+0x28/0x50 kasan_set_track+0x28/0x38 kasan_save_alloc_info+0x20/0x30 __kasan_slab_alloc+0x6c/0x80 kmem_cache_alloc+0x15c/0x4a8 trace_create_new_event+0x84/0x348 __trace_add_new_event+0x18/0x88 event_trace_add_tracer+0xc4/0x1a0 trace_array_create_dir+0x6c/0x100 trace_array_create+0x2e8/0x568 instance_mkdir+0x48/0x80 tracefs_syscall_mkdir+0x90/0xe8 vfs_mkdir+0x3c4/0x610 do_mkdirat+0x144/0x200 __arm64_sys_mkdirat+0x8c/0xc0 invoke_syscall+0x70/0x260 el0_svc_common.constprop.0+0xb0/0x280 do_el0_svc+0x44/0x60 el0_svc+0x34/0x68 el0t_64_sync_handler+0xb8/0xc0 el0t_64_sync+0x168/0x170 Freed by task 191: kasan_save_stack+0x28/0x50 kasan_set_track+0x28/0x38 kasan_save_free_info+0x34/0x58 __kasan_slab_free+0xe4/0x158 kmem_cache_free+0x19c/0x508 event_file_put+0xa0/0x120 remove_event_file_dir+0x180/0x320 event_trace_del_tracer+0xb0/0x180 __remove_instance+0x224/0x508 instance_rmdir+0x44/0x78 tracefs_syscall_rmdir+0xbc/0x140 vfs_rmdir+0x1cc/0x4c8 do_rmdir+0x220/0x2b8 __arm64_sys_unlinkat+0xc0/0x100 invoke_syscall+0x70/0x260 el0_svc_common.constprop.0+0xb0/0x280 do_el0_svc+0x44/0x60 el0_svc+0x34/0x68 el0t_64_sync_handler+0xb8/0xc0 el0t_64_sync+0x168/0x170 Suggested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com> --- kernel/trace/trace_events_hist.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) Steve, thanks for your review! v2: - Introduce tracing_single_release_file_tr() to add the missing call for single_release() as suggested by Steve; Link: https://lore.kernel.org/all/20231212113546.6a51d359@gandalf.local.home/ - Slightly modify the commit message and comments. v1: Link: https://lore.kernel.org/all/20231212113317.4159890-1-zhengyejian1@huawei.com/ diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 1abc07fba1b9..5296a08c0641 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -5619,14 +5619,22 @@ static int hist_show(struct seq_file *m, void *v) return ret; } +static int tracing_single_release_file_tr(struct inode *inode, struct file *filp) +{ + tracing_release_file_tr(inode, filp); + return single_release(inode, filp); +} + static int event_hist_open(struct inode *inode, struct file *file) { int ret; - ret = security_locked_down(LOCKDOWN_TRACEFS); + ret = tracing_open_file_tr(inode, file); if (ret) return ret; + /* Clear private_data to avoid warning in single_open() */ + file->private_data = NULL; return single_open(file, hist_show, file); } @@ -5634,7 +5642,7 @@ const struct file_operations event_hist_fops = { .open = event_hist_open, .read = seq_read, .llseek = seq_lseek, - .release = single_release, + .release = tracing_single_release_file_tr, }; #ifdef CONFIG_HIST_TRIGGERS_DEBUG @@ -5900,10 +5908,12 @@ static int event_hist_debug_open(struct inode *inode, struct file *file) { int ret; - ret = security_locked_down(LOCKDOWN_TRACEFS); + ret = tracing_open_file_tr(inode, file); if (ret) return ret; + /* Clear private_data to avoid warning in single_open() */ + file->private_data = NULL; return single_open(file, hist_debug_show, file); } @@ -5911,7 +5921,7 @@ const struct file_operations event_hist_debug_fops = { .open = event_hist_debug_open, .read = seq_read, .llseek = seq_lseek, - .release = single_release, + .release = tracing_single_release_file_tr, }; #endif -- 2.25.1 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2] tracing: Fix uaf issue when open the hist or hist_debug file 2023-12-13 1:51 ` [PATCH v2] " Zheng Yejian @ 2023-12-13 13:01 ` Steven Rostedt 2023-12-14 1:21 ` [PATCH v3] " Zheng Yejian 0 siblings, 1 reply; 5+ messages in thread From: Steven Rostedt @ 2023-12-13 13:01 UTC (permalink / raw) To: Zheng Yejian Cc: linux-kernel, linux-trace-kernel, mathieu.desnoyers, mhiramat, yeweihua4 On Wed, 13 Dec 2023 09:51:38 +0800 Zheng Yejian <zhengyejian1@huawei.com> wrote: > --- > kernel/trace/trace_events_hist.c | 18 ++++++++++++++---- > 1 file changed, 14 insertions(+), 4 deletions(-) > > Steve, thanks for your review! > > v2: > - Introduce tracing_single_release_file_tr() to add the missing call for > single_release() as suggested by Steve; > Link: https://lore.kernel.org/all/20231212113546.6a51d359@gandalf.local.home/ > - Slightly modify the commit message and comments. > > v1: > Link: https://lore.kernel.org/all/20231212113317.4159890-1-zhengyejian1@huawei.com/ > > diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c > index 1abc07fba1b9..5296a08c0641 100644 > --- a/kernel/trace/trace_events_hist.c > +++ b/kernel/trace/trace_events_hist.c > @@ -5619,14 +5619,22 @@ static int hist_show(struct seq_file *m, void *v) > return ret; > } > > +static int tracing_single_release_file_tr(struct inode *inode, struct file *filp) > +{ > + tracing_release_file_tr(inode, filp); > + return single_release(inode, filp); > +} > + Hi Zheng, Could you put the tracing_single_release_file_tr() into trace.c as a non static function. Put the protocol in kernel/trace/trace.h. Even though it's only used in trace_events_hist.c, I rather not hide it there. If this issue appears for another file, I would look in trace.c and trace.h for available functions to use. Thanks, -- Steve ^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v3] tracing: Fix uaf issue when open the hist or hist_debug file 2023-12-13 13:01 ` Steven Rostedt @ 2023-12-14 1:21 ` Zheng Yejian 0 siblings, 0 replies; 5+ messages in thread From: Zheng Yejian @ 2023-12-14 1:21 UTC (permalink / raw) To: rostedt Cc: linux-kernel, linux-trace-kernel, mathieu.desnoyers, mhiramat, yeweihua4, zhengyejian1 KASAN report following issue. The root cause is when opening 'hist' file of an instance and accessing 'trace_event_file' in hist_show(), but 'trace_event_file' has been freed due to the instance being removed. 'hist_debug' file has the same problem. To fix it, call tracing_{open,release}_file_tr() in file_operations callback to have the ref count and avoid 'trace_event_file' being freed. BUG: KASAN: slab-use-after-free in hist_show+0x11e0/0x1278 Read of size 8 at addr ffff242541e336b8 by task head/190 CPU: 4 PID: 190 Comm: head Not tainted 6.7.0-rc5-g26aff849438c #133 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x98/0xf8 show_stack+0x1c/0x30 dump_stack_lvl+0x44/0x58 print_report+0xf0/0x5a0 kasan_report+0x80/0xc0 __asan_report_load8_noabort+0x1c/0x28 hist_show+0x11e0/0x1278 seq_read_iter+0x344/0xd78 seq_read+0x128/0x1c0 vfs_read+0x198/0x6c8 ksys_read+0xf4/0x1e0 __arm64_sys_read+0x70/0xa8 invoke_syscall+0x70/0x260 el0_svc_common.constprop.0+0xb0/0x280 do_el0_svc+0x44/0x60 el0_svc+0x34/0x68 el0t_64_sync_handler+0xb8/0xc0 el0t_64_sync+0x168/0x170 Allocated by task 188: kasan_save_stack+0x28/0x50 kasan_set_track+0x28/0x38 kasan_save_alloc_info+0x20/0x30 __kasan_slab_alloc+0x6c/0x80 kmem_cache_alloc+0x15c/0x4a8 trace_create_new_event+0x84/0x348 __trace_add_new_event+0x18/0x88 event_trace_add_tracer+0xc4/0x1a0 trace_array_create_dir+0x6c/0x100 trace_array_create+0x2e8/0x568 instance_mkdir+0x48/0x80 tracefs_syscall_mkdir+0x90/0xe8 vfs_mkdir+0x3c4/0x610 do_mkdirat+0x144/0x200 __arm64_sys_mkdirat+0x8c/0xc0 invoke_syscall+0x70/0x260 el0_svc_common.constprop.0+0xb0/0x280 do_el0_svc+0x44/0x60 el0_svc+0x34/0x68 el0t_64_sync_handler+0xb8/0xc0 el0t_64_sync+0x168/0x170 Freed by task 191: kasan_save_stack+0x28/0x50 kasan_set_track+0x28/0x38 kasan_save_free_info+0x34/0x58 __kasan_slab_free+0xe4/0x158 kmem_cache_free+0x19c/0x508 event_file_put+0xa0/0x120 remove_event_file_dir+0x180/0x320 event_trace_del_tracer+0xb0/0x180 __remove_instance+0x224/0x508 instance_rmdir+0x44/0x78 tracefs_syscall_rmdir+0xbc/0x140 vfs_rmdir+0x1cc/0x4c8 do_rmdir+0x220/0x2b8 __arm64_sys_unlinkat+0xc0/0x100 invoke_syscall+0x70/0x260 el0_svc_common.constprop.0+0xb0/0x280 do_el0_svc+0x44/0x60 el0_svc+0x34/0x68 el0t_64_sync_handler+0xb8/0xc0 el0t_64_sync+0x168/0x170 Suggested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com> --- kernel/trace/trace.c | 6 ++++++ kernel/trace/trace.h | 1 + kernel/trace/trace_events_hist.c | 12 ++++++++---- 3 files changed, 15 insertions(+), 4 deletions(-) v3: - As suggested by Steve, put the tracing_single_release_file_tr() into trace.c as a non static function, put the prototype in trace.h. Link: https://lore.kernel.org/all/20231213080127.6ef26247@gandalf.local.home/ v2: - Introduce tracing_single_release_file_tr() to add the missing call for single_release() as suggested by Steve; Link: https://lore.kernel.org/all/20231212113546.6a51d359@gandalf.local.home/ - Slightly modify the commit message and comments. - Link: https://lore.kernel.org/all/20231213015138.281888-1-zhengyejian1@huawei.com/ v1: Link: https://lore.kernel.org/all/20231212113317.4159890-1-zhengyejian1@huawei.com/ diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index fbcd3bafb93e..fc1b2ada98a5 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4964,6 +4964,12 @@ int tracing_release_file_tr(struct inode *inode, struct file *filp) return 0; } +int tracing_single_release_file_tr(struct inode *inode, struct file *filp) +{ + tracing_release_file_tr(inode, filp); + return single_release(inode, filp); +} + static int tracing_mark_open(struct inode *inode, struct file *filp) { stream_open(inode, filp); diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index b7f4ea25a194..0489e72c8169 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -617,6 +617,7 @@ int tracing_open_generic(struct inode *inode, struct file *filp); int tracing_open_generic_tr(struct inode *inode, struct file *filp); int tracing_open_file_tr(struct inode *inode, struct file *filp); int tracing_release_file_tr(struct inode *inode, struct file *filp); +int tracing_single_release_file_tr(struct inode *inode, struct file *filp); bool tracing_is_disabled(void); bool tracer_tracing_is_on(struct trace_array *tr); void tracer_tracing_on(struct trace_array *tr); diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 1abc07fba1b9..5ecf3c8bde20 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -5623,10 +5623,12 @@ static int event_hist_open(struct inode *inode, struct file *file) { int ret; - ret = security_locked_down(LOCKDOWN_TRACEFS); + ret = tracing_open_file_tr(inode, file); if (ret) return ret; + /* Clear private_data to avoid warning in single_open() */ + file->private_data = NULL; return single_open(file, hist_show, file); } @@ -5634,7 +5636,7 @@ const struct file_operations event_hist_fops = { .open = event_hist_open, .read = seq_read, .llseek = seq_lseek, - .release = single_release, + .release = tracing_single_release_file_tr, }; #ifdef CONFIG_HIST_TRIGGERS_DEBUG @@ -5900,10 +5902,12 @@ static int event_hist_debug_open(struct inode *inode, struct file *file) { int ret; - ret = security_locked_down(LOCKDOWN_TRACEFS); + ret = tracing_open_file_tr(inode, file); if (ret) return ret; + /* Clear private_data to avoid warning in single_open() */ + file->private_data = NULL; return single_open(file, hist_debug_show, file); } @@ -5911,7 +5915,7 @@ const struct file_operations event_hist_debug_fops = { .open = event_hist_debug_open, .read = seq_read, .llseek = seq_lseek, - .release = single_release, + .release = tracing_single_release_file_tr, }; #endif -- 2.25.1 ^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2023-12-14 1:21 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2023-12-12 11:33 [PATCH] tracing: Fix uaf issue when open the hist or hist_debug file Zheng Yejian 2023-12-12 16:35 ` Steven Rostedt 2023-12-13 1:51 ` [PATCH v2] " Zheng Yejian 2023-12-13 13:01 ` Steven Rostedt 2023-12-14 1:21 ` [PATCH v3] " Zheng Yejian
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