diff options
Diffstat (limited to 'poky/meta/recipes-kernel/lttng/lttng-modules/0004-Fix-kretprobe-null-ptr-deref-on-session-destroy.patch')
-rw-r--r-- | poky/meta/recipes-kernel/lttng/lttng-modules/0004-Fix-kretprobe-null-ptr-deref-on-session-destroy.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/poky/meta/recipes-kernel/lttng/lttng-modules/0004-Fix-kretprobe-null-ptr-deref-on-session-destroy.patch b/poky/meta/recipes-kernel/lttng/lttng-modules/0004-Fix-kretprobe-null-ptr-deref-on-session-destroy.patch new file mode 100644 index 000000000..8a839c2b4 --- /dev/null +++ b/poky/meta/recipes-kernel/lttng/lttng-modules/0004-Fix-kretprobe-null-ptr-deref-on-session-destroy.patch @@ -0,0 +1,41 @@ +From 92cc3e7f76a545a2cd4828576971f1eea83f4e68 Mon Sep 17 00:00:00 2001 +From: Francis Deslauriers <francis.deslauriers@efficios.com> +Date: Wed, 17 Mar 2021 10:40:56 -0400 +Subject: [PATCH 4/4] Fix: kretprobe: null ptr deref on session destroy + +The `filter_bytecode_runtime_head` list is currently not initialized for +the return event of the kretprobe. This caused a kernel null ptr +dereference when destroying a session. It can reproduced with the +following commands: + + lttng create + lttng enable-event -k --function=lttng_test_filter_event_write my_event + lttng start + lttng stop + lttng destroy + +Upstream-status: backport + +Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com> +Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> +Change-Id: I1162ce8b10dd7237a26331531f048346b984eee7 +--- + lttng-events.c | 2 ++ + 1 file changed, 2 insertions(+) + +diff --git a/lttng-events.c b/lttng-events.c +index 984bd341..3450fa40 100644 +--- a/lttng-events.c ++++ b/lttng-events.c +@@ -704,6 +704,8 @@ struct lttng_event *_lttng_event_create(struct lttng_channel *chan, + event_return->enabled = 0; + event_return->registered = 1; + event_return->instrumentation = itype; ++ INIT_LIST_HEAD(&event_return->bytecode_runtime_head); ++ INIT_LIST_HEAD(&event_return->enablers_ref_head); + /* + * Populate lttng_event structure before kretprobe registration. + */ +-- +2.19.1 + |