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bpf: Fix tcx/netkit detach permissions when prog fd isn't given #10850

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bpf: Fix tcx/netkit detach permissions when prog fd isn't given #10850

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5 changes: 5 additions & 0 deletions include/linux/bpf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2623,6 +2623,11 @@ static inline bool bpf_bypass_spec_v4(const struct bpf_token *token)
bpf_token_capable(token, CAP_PERFMON);
}

static inline bool bpf_net_capable(void)
{
return capable(CAP_NET_ADMIN) || capable(CAP_SYS_ADMIN);
}

int bpf_map_new_fd(struct bpf_map *map, int flags);
int bpf_prog_new_fd(struct bpf_prog *prog);

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12 changes: 12 additions & 0 deletions include/linux/bpf_mprog.h
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Original file line number Diff line number Diff line change
Expand Up @@ -340,4 +340,16 @@ static inline bool bpf_mprog_supported(enum bpf_prog_type type)
return false;
}
}

#ifdef CONFIG_BPF_SYSCALL
static inline bool bpf_mprog_detach_empty(enum bpf_prog_type type)
{
switch (type) {
case BPF_PROG_TYPE_SCHED_CLS:
return bpf_net_capable();
default:
return false;
}
}
#endif /* CONFIG_BPF_SYSCALL */
#endif /* __BPF_MPROG_H */
7 changes: 2 additions & 5 deletions kernel/bpf/syscall.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1366,11 +1366,6 @@ static int map_check_btf(struct bpf_map *map, struct bpf_token *token,
return ret;
}

static bool bpf_net_capable(void)
{
return capable(CAP_NET_ADMIN) || capable(CAP_SYS_ADMIN);
}

#define BPF_MAP_CREATE_LAST_FIELD excl_prog_hash_size
/* called via syscall */
static int map_create(union bpf_attr *attr, bpfptr_t uattr)
Expand Down Expand Up @@ -4565,6 +4560,8 @@ static int bpf_prog_detach(const union bpf_attr *attr)
prog = bpf_prog_get_type(attr->attach_bpf_fd, ptype);
if (IS_ERR(prog))
return PTR_ERR(prog);
} else if (!bpf_mprog_detach_empty(ptype)) {
return -EPERM;
}
} else if (is_cgroup_prog_type(ptype, 0, false)) {
if (attr->attach_flags || attr->relative_fd)
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