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1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2024 Google LLC. */3 4#include <vmlinux.h>5#include <bpf/bpf_helpers.h>6#include <bpf/bpf_tracing.h>7 8#include "bpf_misc.h"9#include "bpf_experimental.h"10 11static char buf[64];12 13SEC("lsm.s/file_open")14__success15int BPF_PROG(get_task_exe_file_and_put_kfunc_from_current_sleepable)16{17 struct file *acquired;18 19 acquired = bpf_get_task_exe_file(bpf_get_current_task_btf());20 if (!acquired)21 return 0;22 23 bpf_put_file(acquired);24 return 0;25}26 27SEC("lsm/file_open")28__success29int BPF_PROG(get_task_exe_file_and_put_kfunc_from_current_non_sleepable, struct file *file)30{31 struct file *acquired;32 33 acquired = bpf_get_task_exe_file(bpf_get_current_task_btf());34 if (!acquired)35 return 0;36 37 bpf_put_file(acquired);38 return 0;39}40 41SEC("lsm.s/task_alloc")42__success43int BPF_PROG(get_task_exe_file_and_put_kfunc_from_argument,44 struct task_struct *task)45{46 struct file *acquired;47 48 acquired = bpf_get_task_exe_file(task);49 if (!acquired)50 return 0;51 52 bpf_put_file(acquired);53 return 0;54}55 56SEC("lsm.s/inode_getattr")57__success58int BPF_PROG(path_d_path_from_path_argument, struct path *path)59{60 int ret;61 62 ret = bpf_path_d_path(path, buf, sizeof(buf));63 __sink(ret);64 return 0;65}66 67SEC("lsm.s/file_open")68__success69int BPF_PROG(path_d_path_from_file_argument, struct file *file)70{71 int ret;72 struct path *path;73 74 /* The f_path member is a path which is embedded directly within a75 * file. Therefore, a pointer to such embedded members are still76 * recognized by the BPF verifier as being PTR_TRUSTED as it's77 * essentially PTR_TRUSTED w/ a non-zero fixed offset.78 */79 path = &file->f_path;80 ret = bpf_path_d_path(path, buf, sizeof(buf));81 __sink(ret);82 return 0;83}84 85char _license[] SEC("license") = "GPL";86