diff options
Diffstat (limited to 'kernel/bpf/bpf_lsm.c')
| -rw-r--r-- | kernel/bpf/bpf_lsm.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c index 3b3bbb28603e..19636703b24e 100644 --- a/kernel/bpf/bpf_lsm.c +++ b/kernel/bpf/bpf_lsm.c @@ -9,6 +9,8 @@ #include <linux/btf.h> #include <linux/lsm_hooks.h> #include <linux/bpf_lsm.h> +#include <linux/kallsyms.h> +#include <linux/bpf_verifier.h> /* For every LSM hook that allows attachment of BPF programs, declare a nop * function where a BPF program can be attached. @@ -22,6 +24,27 @@ noinline RET bpf_lsm_##NAME(__VA_ARGS__) \ #include <linux/lsm_hook_defs.h> #undef LSM_HOOK +#define BPF_LSM_SYM_PREFX "bpf_lsm_" + +int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog, + const struct bpf_prog *prog) +{ + if (!prog->gpl_compatible) { + bpf_log(vlog, + "LSM programs must have a GPL compatible license\n"); + return -EINVAL; + } + + if (strncmp(BPF_LSM_SYM_PREFX, prog->aux->attach_func_name, + sizeof(BPF_LSM_SYM_PREFX) - 1)) { + bpf_log(vlog, "attach_btf_id %u points to wrong type name %s\n", + prog->aux->attach_btf_id, prog->aux->attach_func_name); + return -EINVAL; + } + + return 0; +} + const struct bpf_prog_ops lsm_prog_ops = { }; |