From: "Steven Rostedt (VMware)" rostedt@goodmis.org

All internal use cases for tracepoint_probe_register() is set to not ever be called with the same function and data. If it is, it is considered a bug, as that means the accounting of handling tracepoints is corrupted. If the function and data for a tracepoint is already registered when tracepoint_probe_register() is called, it will call WARN_ON_ONCE() and return with EEXISTS.

The BPF system call can end up calling tracepoint_probe_register() with the same data, which now means that this can trigger the warning because of a user space process. As WARN_ON_ONCE() should not be called because user space called a system call with bad data, there needs to be a way to register a tracepoint without triggering a warning.

Enter tracepoint_probe_register_may_exist(), which can be called, but will not cause a WARN_ON() if the probe already exists. It will still error out with EEXIST, which will then be sent to the user space that performed the BPF system call.

This keeps the previous testing for issues with other users of the tracepoint code, while letting BPF call it with duplicated data and not warn about it.

Link: https://lore.kernel.org/lkml/20210626135845.4080-1-penguin-kernel@I-love.SAK... Link: https://syzkaller.appspot.com/bug?id=41f4318cf01762389f4d1c1c459da4f542fe515...

Cc: stable@vger.kernel.org Fixes: c4f6699dfcb85 ("bpf: introduce BPF_RAW_TRACEPOINT") Reported-by: syzbot syzbot+721aa903751db87aa244@syzkaller.appspotmail.com Reported-by: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Tested-by: syzbot+721aa903751db87aa244@syzkaller.appspotmail.com Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org --- include/linux/tracepoint.h | 10 ++++++++++ kernel/trace/bpf_trace.c | 3 ++- kernel/tracepoint.c | 33 ++++++++++++++++++++++++++++++--- 3 files changed, 42 insertions(+), 4 deletions(-)

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index 13f65420f188..ab58696d0ddd 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -41,7 +41,17 @@ extern int tracepoint_probe_register_prio(struct tracepoint *tp, void *probe, void *data, int prio); extern int +tracepoint_probe_register_prio_may_exist(struct tracepoint *tp, void *probe, void *data, + int prio); +extern int tracepoint_probe_unregister(struct tracepoint *tp, void *probe, void *data); +static inline int +tracepoint_probe_register_may_exist(struct tracepoint *tp, void *probe, + void *data) +{ + return tracepoint_probe_register_prio_may_exist(tp, probe, data, + TRACEPOINT_DEFAULT_PRIO); +} extern void for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv), void *priv); diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 7a52bc172841..f0568b3d6bd1 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1840,7 +1840,8 @@ static int __bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog * if (prog->aux->max_tp_access > btp->writable_size) return -EINVAL;

- return tracepoint_probe_register(tp, (void *)btp->bpf_func, prog); + return tracepoint_probe_register_may_exist(tp, (void *)btp->bpf_func, + prog); }

int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *prog) diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index 9f478d29b926..976bf8ce8039 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -273,7 +273,8 @@ static void tracepoint_update_call(struct tracepoint *tp, struct tracepoint_func * Add the probe function to a tracepoint. */ static int tracepoint_add_func(struct tracepoint *tp, - struct tracepoint_func *func, int prio) + struct tracepoint_func *func, int prio, + bool warn) { struct tracepoint_func *old, *tp_funcs; int ret; @@ -288,7 +289,7 @@ static int tracepoint_add_func(struct tracepoint *tp, lockdep_is_held(&tracepoints_mutex)); old = func_add(&tp_funcs, func, prio); if (IS_ERR(old)) { - WARN_ON_ONCE(PTR_ERR(old) != -ENOMEM); + WARN_ON_ONCE(warn && PTR_ERR(old) != -ENOMEM); return PTR_ERR(old); }

@@ -343,6 +344,32 @@ static int tracepoint_remove_func(struct tracepoint *tp, return 0; }

+/** + * tracepoint_probe_register_prio_may_exist - Connect a probe to a tracepoint with priority + * @tp: tracepoint + * @probe: probe handler + * @data: tracepoint data + * @prio: priority of this function over other registered functions + * + * Same as tracepoint_probe_register_prio() except that it will not warn + * if the tracepoint is already registered. + */ +int tracepoint_probe_register_prio_may_exist(struct tracepoint *tp, void *probe, + void *data, int prio) +{ + struct tracepoint_func tp_func; + int ret; + + mutex_lock(&tracepoints_mutex); + tp_func.func = probe; + tp_func.data = data; + tp_func.prio = prio; + ret = tracepoint_add_func(tp, &tp_func, prio, false); + mutex_unlock(&tracepoints_mutex); + return ret; +} +EXPORT_SYMBOL_GPL(tracepoint_probe_register_prio_may_exist); + /** * tracepoint_probe_register_prio - Connect a probe to a tracepoint with priority * @tp: tracepoint @@ -366,7 +393,7 @@ int tracepoint_probe_register_prio(struct tracepoint *tp, void *probe, tp_func.func = probe; tp_func.data = data; tp_func.prio = prio; - ret = tracepoint_add_func(tp, &tp_func, prio); + ret = tracepoint_add_func(tp, &tp_func, prio, true); mutex_unlock(&tracepoints_mutex); return ret; }