diff options
Diffstat (limited to 'kernel/bpf/syscall.c')
| -rw-r--r-- | kernel/bpf/syscall.c | 89 |
1 files changed, 68 insertions, 21 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index de2a75500233..79bcd8d056d2 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1534,7 +1534,7 @@ static int map_freeze(const union bpf_attr *attr) err = -EBUSY; goto err_put; } - if (!capable(CAP_SYS_ADMIN)) { + if (!bpf_capable()) { err = -EPERM; goto err_put; } @@ -2009,6 +2009,55 @@ bpf_prog_load_check_attach(enum bpf_prog_type prog_type, } } +static bool is_net_admin_prog_type(enum bpf_prog_type prog_type) +{ + switch (prog_type) { + case BPF_PROG_TYPE_SCHED_CLS: + case BPF_PROG_TYPE_SCHED_ACT: + case BPF_PROG_TYPE_XDP: + case BPF_PROG_TYPE_LWT_IN: + case BPF_PROG_TYPE_LWT_OUT: + case BPF_PROG_TYPE_LWT_XMIT: + case BPF_PROG_TYPE_LWT_SEG6LOCAL: + case BPF_PROG_TYPE_SK_SKB: + case BPF_PROG_TYPE_SK_MSG: + case BPF_PROG_TYPE_LIRC_MODE2: + case BPF_PROG_TYPE_FLOW_DISSECTOR: + case BPF_PROG_TYPE_CGROUP_DEVICE: + case BPF_PROG_TYPE_CGROUP_SOCK: + case BPF_PROG_TYPE_CGROUP_SOCK_ADDR: + case BPF_PROG_TYPE_CGROUP_SOCKOPT: + case BPF_PROG_TYPE_CGROUP_SYSCTL: + case BPF_PROG_TYPE_SOCK_OPS: + case BPF_PROG_TYPE_EXT: /* extends any prog */ + return true; + case BPF_PROG_TYPE_CGROUP_SKB: + /* always unpriv */ + case BPF_PROG_TYPE_SK_REUSEPORT: + /* equivalent to SOCKET_FILTER. need CAP_BPF only */ + default: + return false; + } +} + +static bool is_perfmon_prog_type(enum bpf_prog_type prog_type) +{ + switch (prog_type) { + case BPF_PROG_TYPE_KPROBE: + case BPF_PROG_TYPE_TRACEPOINT: + case BPF_PROG_TYPE_PERF_EVENT: + case BPF_PROG_TYPE_RAW_TRACEPOINT: + case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE: + case BPF_PROG_TYPE_TRACING: + case BPF_PROG_TYPE_LSM: + case BPF_PROG_TYPE_STRUCT_OPS: /* has access to struct sock */ + case BPF_PROG_TYPE_EXT: /* extends any prog */ + return true; + default: + return false; + } +} + /* last field in 'union bpf_attr' used by this command */ #define BPF_PROG_LOAD_LAST_FIELD attach_prog_fd @@ -2031,7 +2080,7 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr) if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && (attr->prog_flags & BPF_F_ANY_ALIGNMENT) && - !capable(CAP_SYS_ADMIN)) + !bpf_capable()) return -EPERM; /* copy eBPF program license from user space */ @@ -2044,11 +2093,16 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr) is_gpl = license_is_gpl_compatible(license); if (attr->insn_cnt == 0 || - attr->insn_cnt > (capable(CAP_SYS_ADMIN) ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS)) + attr->insn_cnt > (bpf_capable() ? BPF_COMPLEXITY_LIMIT_INSNS : BPF_MAXINSNS)) return -E2BIG; if (type != BPF_PROG_TYPE_SOCKET_FILTER && type != BPF_PROG_TYPE_CGROUP_SKB && - !capable(CAP_SYS_ADMIN)) + !bpf_capable()) + return -EPERM; + + if (is_net_admin_prog_type(type) && !capable(CAP_NET_ADMIN)) + return -EPERM; + if (is_perfmon_prog_type(type) && !perfmon_capable()) return -EPERM; bpf_prog_load_fixup_attach_type(attr); @@ -2682,6 +2736,11 @@ static int bpf_prog_attach_check_attach_type(const struct bpf_prog *prog, case BPF_PROG_TYPE_CGROUP_SOCKOPT: return attach_type == prog->expected_attach_type ? 0 : -EINVAL; case BPF_PROG_TYPE_CGROUP_SKB: + if (!capable(CAP_NET_ADMIN)) + /* cg-skb progs can be loaded by unpriv user. + * check permissions at attach time. + */ + return -EPERM; return prog->enforce_expected_attach_type && prog->expected_attach_type != attach_type ? -EINVAL : 0; @@ -2747,9 +2806,6 @@ static int bpf_prog_attach(const union bpf_attr *attr) struct bpf_prog *prog; int ret; - if (!capable(CAP_NET_ADMIN)) - return -EPERM; - if (CHECK_ATTR(BPF_PROG_ATTACH)) return -EINVAL; @@ -2804,9 +2860,6 @@ static int bpf_prog_detach(const union bpf_attr *attr) { enum bpf_prog_type ptype; - if (!capable(CAP_NET_ADMIN)) - return -EPERM; - if (CHECK_ATTR(BPF_PROG_DETACH)) return -EINVAL; @@ -2819,6 +2872,8 @@ static int bpf_prog_detach(const union bpf_attr *attr) case BPF_PROG_TYPE_LIRC_MODE2: return lirc_prog_detach(attr); case BPF_PROG_TYPE_FLOW_DISSECTOR: + if (!capable(CAP_NET_ADMIN)) + return -EPERM; return skb_flow_dissector_bpf_prog_detach(attr); case BPF_PROG_TYPE_CGROUP_DEVICE: case BPF_PROG_TYPE_CGROUP_SKB: @@ -2882,8 +2937,6 @@ static int bpf_prog_test_run(const union bpf_attr *attr, struct bpf_prog *prog; int ret = -ENOTSUPP; - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; if (CHECK_ATTR(BPF_PROG_TEST_RUN)) return -EINVAL; @@ -3184,7 +3237,7 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog, info.run_time_ns = stats.nsecs; info.run_cnt = stats.cnt; - if (!capable(CAP_SYS_ADMIN)) { + if (!bpf_capable()) { info.jited_prog_len = 0; info.xlated_prog_len = 0; info.nr_jited_ksyms = 0; @@ -3543,7 +3596,7 @@ static int bpf_btf_load(const union bpf_attr *attr) if (CHECK_ATTR(BPF_BTF_LOAD)) return -EINVAL; - if (!capable(CAP_SYS_ADMIN)) + if (!bpf_capable()) return -EPERM; return btf_new_fd(attr); @@ -3766,9 +3819,6 @@ static int link_create(union bpf_attr *attr) struct bpf_prog *prog; int ret; - if (!capable(CAP_NET_ADMIN)) - return -EPERM; - if (CHECK_ATTR(BPF_LINK_CREATE)) return -EINVAL; @@ -3817,9 +3867,6 @@ static int link_update(union bpf_attr *attr) u32 flags; int ret; - if (!capable(CAP_NET_ADMIN)) - return -EPERM; - if (CHECK_ATTR(BPF_LINK_UPDATE)) return -EINVAL; @@ -3988,7 +4035,7 @@ SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, siz union bpf_attr attr; int err; - if (sysctl_unprivileged_bpf_disabled && !capable(CAP_SYS_ADMIN)) + if (sysctl_unprivileged_bpf_disabled && !bpf_capable()) return -EPERM; err = bpf_check_uarg_tail_zero(uattr, sizeof(attr), size); |