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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/bpf/progs/local_storage.c | |
parent | Initial commit. (diff) | |
download | linux-upstream/5.10.209.tar.xz linux-upstream/5.10.209.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/bpf/progs/local_storage.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/local_storage.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/local_storage.c b/tools/testing/selftests/bpf/progs/local_storage.c new file mode 100644 index 000000000..09529e33b --- /dev/null +++ b/tools/testing/selftests/bpf/progs/local_storage.c @@ -0,0 +1,146 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Copyright 2020 Google LLC. + */ + +#include <errno.h> +#include <linux/bpf.h> +#include <stdbool.h> +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + +char _license[] SEC("license") = "GPL"; + +#define DUMMY_STORAGE_VALUE 0xdeadbeef + +int monitored_pid = 0; +int inode_storage_result = -1; +int sk_storage_result = -1; + +struct dummy_storage { + __u32 value; +}; + +struct { + __uint(type, BPF_MAP_TYPE_INODE_STORAGE); + __uint(map_flags, BPF_F_NO_PREALLOC); + __type(key, int); + __type(value, struct dummy_storage); +} inode_storage_map SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_SK_STORAGE); + __uint(map_flags, BPF_F_NO_PREALLOC | BPF_F_CLONE); + __type(key, int); + __type(value, struct dummy_storage); +} sk_storage_map SEC(".maps"); + +/* TODO Use vmlinux.h once BTF pruning for embedded types is fixed. + */ +struct sock {} __attribute__((preserve_access_index)); +struct sockaddr {} __attribute__((preserve_access_index)); +struct socket { + struct sock *sk; +} __attribute__((preserve_access_index)); + +struct inode {} __attribute__((preserve_access_index)); +struct dentry { + struct inode *d_inode; +} __attribute__((preserve_access_index)); +struct file { + struct inode *f_inode; +} __attribute__((preserve_access_index)); + + +SEC("lsm/inode_unlink") +int BPF_PROG(unlink_hook, struct inode *dir, struct dentry *victim) +{ + __u32 pid = bpf_get_current_pid_tgid() >> 32; + struct dummy_storage *storage; + int err; + + if (pid != monitored_pid) + return 0; + + storage = bpf_inode_storage_get(&inode_storage_map, victim->d_inode, 0, + BPF_LOCAL_STORAGE_GET_F_CREATE); + if (!storage) + return 0; + + if (storage->value != DUMMY_STORAGE_VALUE) + inode_storage_result = -1; + + err = bpf_inode_storage_delete(&inode_storage_map, victim->d_inode); + if (!err) + inode_storage_result = err; + + return 0; +} + +SEC("lsm/socket_bind") +int BPF_PROG(socket_bind, struct socket *sock, struct sockaddr *address, + int addrlen) +{ + __u32 pid = bpf_get_current_pid_tgid() >> 32; + struct dummy_storage *storage; + int err; + + if (pid != monitored_pid) + return 0; + + storage = bpf_sk_storage_get(&sk_storage_map, sock->sk, 0, + BPF_LOCAL_STORAGE_GET_F_CREATE); + if (!storage) + return 0; + + if (storage->value != DUMMY_STORAGE_VALUE) + sk_storage_result = -1; + + err = bpf_sk_storage_delete(&sk_storage_map, sock->sk); + if (!err) + sk_storage_result = err; + + return 0; +} + +SEC("lsm/socket_post_create") +int BPF_PROG(socket_post_create, struct socket *sock, int family, int type, + int protocol, int kern) +{ + __u32 pid = bpf_get_current_pid_tgid() >> 32; + struct dummy_storage *storage; + + if (pid != monitored_pid) + return 0; + + storage = bpf_sk_storage_get(&sk_storage_map, sock->sk, 0, + BPF_LOCAL_STORAGE_GET_F_CREATE); + if (!storage) + return 0; + + storage->value = DUMMY_STORAGE_VALUE; + + return 0; +} + +SEC("lsm/file_open") +int BPF_PROG(file_open, struct file *file) +{ + __u32 pid = bpf_get_current_pid_tgid() >> 32; + struct dummy_storage *storage; + + if (pid != monitored_pid) + return 0; + + if (!file->f_inode) + return 0; + + storage = bpf_inode_storage_get(&inode_storage_map, file->f_inode, 0, + BPF_LOCAL_STORAGE_GET_F_CREATE); + if (!storage) + return 0; + + storage->value = DUMMY_STORAGE_VALUE; + return 0; +} |