This is a note to let you know that I've just added the patch titled kprobes: Fix check for probe enabled in kill_kprobe() to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kprobes-fix-check-for-probe-enabled-in-kill_kprobe.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 508046c312440bcf41778d41d68fad98088d1480 Author: Li Huafei <lihuafei1@xxxxxxxxxx> Date: Sat Nov 26 19:43:16 2022 +0800 kprobes: Fix check for probe enabled in kill_kprobe() [ Upstream commit 0c76ef3f26d5ef2ac2c21b47e7620cff35809fbb ] In kill_kprobe(), the check whether disarm_kprobe_ftrace() needs to be called always fails. This is because before that we set the KPROBE_FLAG_GONE flag for kprobe so that "!kprobe_disabled(p)" is always false. The disarm_kprobe_ftrace() call introduced by commit: 0cb2f1372baa ("kprobes: Fix NULL pointer dereference at kprobe_ftrace_handler") to fix the NULL pointer reference problem. When the probe is enabled, if we do not disarm it, this problem still exists. Fix it by putting the probe enabled check before setting the KPROBE_FLAG_GONE flag. Link: https://lore.kernel.org/all/20221126114316.201857-1-lihuafei1@xxxxxxxxxx/ Fixes: 3031313eb3d54 ("kprobes: Fix to check probe enabled before disarm_kprobe_ftrace()") Signed-off-by: Li Huafei <lihuafei1@xxxxxxxxxx> Acked-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx> Reviewed-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 3050631e528d..a35074f0daa1 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -2364,6 +2364,14 @@ static void kill_kprobe(struct kprobe *p) lockdep_assert_held(&kprobe_mutex); + /* + * The module is going away. We should disarm the kprobe which + * is using ftrace, because ftrace framework is still available at + * 'MODULE_STATE_GOING' notification. + */ + if (kprobe_ftrace(p) && !kprobe_disabled(p) && !kprobes_all_disarmed) + disarm_kprobe_ftrace(p); + p->flags |= KPROBE_FLAG_GONE; if (kprobe_aggrprobe(p)) { /* @@ -2380,14 +2388,6 @@ static void kill_kprobe(struct kprobe *p) * the original probed function (which will be freed soon) any more. */ arch_remove_kprobe(p); - - /* - * The module is going away. We should disarm the kprobe which - * is using ftrace, because ftrace framework is still available at - * 'MODULE_STATE_GOING' notification. - */ - if (kprobe_ftrace(p) && !kprobe_disabled(p) && !kprobes_all_disarmed) - disarm_kprobe_ftrace(p); } /* Disable one kprobe */