From: Jiri Olsa jolsa@kernel.org
stable inclusion from stable-v6.6.35 commit d387805d4b4a46ee01e3dae133c81b6d80195e5b category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IACS7Y CVE: CVE-2024-40908
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
---------------------------
[ Upstream commit d0d1df8ba18abc57f28fb3bc053b2bf319367f2c ]
syzbot reported crash when rawtp program executed through the test_run interface calls bpf_get_attach_cookie helper or any other helper that touches task->bpf_ctx pointer.
Setting the run context (task->bpf_ctx pointer) for test_run callback.
Fixes: 7adfc6c9b315 ("bpf: Add bpf_get_attach_cookie() BPF helper to access bpf_cookie value") Reported-by: syzbot+3ab78ff125b7979e45f9@syzkaller.appspotmail.com Signed-off-by: Jiri Olsa jolsa@kernel.org Signed-off-by: Andrii Nakryiko andrii@kernel.org Signed-off-by: Daniel Borkmann daniel@iogearbox.net Closes: https://syzkaller.appspot.com/bug?extid=3ab78ff125b7979e45f9 Link: https://lore.kernel.org/bpf/20240604150024.359247-1-jolsa@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Liu Jian liujian56@huawei.com --- net/bpf/test_run.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c index 478ee7aba85f..12a2934b28ff 100644 --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -707,10 +707,16 @@ static void __bpf_prog_test_run_raw_tp(void *data) { struct bpf_raw_tp_test_run_info *info = data; + struct bpf_trace_run_ctx run_ctx = {}; + struct bpf_run_ctx *old_run_ctx; + + old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
rcu_read_lock(); info->retval = bpf_prog_run(info->prog, info->ctx); rcu_read_unlock(); + + bpf_reset_run_ctx(old_run_ctx); }
int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,