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bpf,lsm: add BPF token LSM hooks

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Wire up bpf_token_create and bpf_token_free LSM hooks, which allow to
allocate LSM security blob (we add `void *security` field to struct
bpf_token for that), but also control who can instantiate BPF token.
This follows existing pattern for BPF map and BPF prog.

Also add security_bpf_token_allow_cmd() and security_bpf_token_capable()
LSM hooks that allow LSM implementation to control and negate (if
necessary) BPF token's delegation of a specific bpf_cmd and capability,
respectively.

Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20231130185229.2688956-12-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko
2023-11-30 10:52:23 -08:00
committed by Alexei Starovoitov
parent 66d636d70a
commit d734ca7b33
6 changed files with 109 additions and 6 deletions
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3
include/linux/bpf.h
View File

@@ -1604,6 +1604,9 @@ struct bpf_token {
u64 allowed_maps;
u64 allowed_progs;
u64 allowed_attachs;
#ifdef CONFIG_SECURITY
void *security;
#endif
};
struct bpf_struct_ops_value;

5
include/linux/lsm_hook_defs.h
View File

@@ -404,6 +404,11 @@ LSM_HOOK(void, LSM_RET_VOID, bpf_map_free, struct bpf_map *map)
LSM_HOOK(int, 0, bpf_prog_load, struct bpf_prog *prog, union bpf_attr *attr,
struct bpf_token *token)
LSM_HOOK(void, LSM_RET_VOID, bpf_prog_free, struct bpf_prog *prog)
LSM_HOOK(int, 0, bpf_token_create, struct bpf_token *token, union bpf_attr *attr,
struct path *path)
LSM_HOOK(void, LSM_RET_VOID, bpf_token_free, struct bpf_token *token)
LSM_HOOK(int, 0, bpf_token_cmd, const struct bpf_token *token, enum bpf_cmd cmd)
LSM_HOOK(int, 0, bpf_token_capable, const struct bpf_token *token, int cap)
#endif /* CONFIG_BPF_SYSCALL */
LSM_HOOK(int, 0, locked_down, enum lockdown_reason what)

25
include/linux/security.h
View File

@@ -32,6 +32,7 @@
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/sockptr.h>
#include <linux/bpf.h>
struct linux_binprm;
struct cred;
@@ -2031,6 +2032,11 @@ extern void security_bpf_map_free(struct bpf_map *map);
extern int security_bpf_prog_load(struct bpf_prog *prog, union bpf_attr *attr,
struct bpf_token *token);
extern void security_bpf_prog_free(struct bpf_prog *prog);
extern int security_bpf_token_create(struct bpf_token *token, union bpf_attr *attr,
struct path *path);
extern void security_bpf_token_free(struct bpf_token *token);
extern int security_bpf_token_cmd(const struct bpf_token *token, enum bpf_cmd cmd);
extern int security_bpf_token_capable(const struct bpf_token *token, int cap);
#else
static inline int security_bpf(int cmd, union bpf_attr *attr,
unsigned int size)
@@ -2065,6 +2071,25 @@ static inline int security_bpf_prog_load(struct bpf_prog *prog, union bpf_attr *
static inline void security_bpf_prog_free(struct bpf_prog *prog)
{ }
static inline int security_bpf_token_create(struct bpf_token *token, union bpf_attr *attr,
struct path *path)
{
return 0;
}
static inline void security_bpf_token_free(struct bpf_token *token)
{ }
static inline int security_bpf_token_cmd(const struct bpf_token *token, enum bpf_cmd cmd)
{
return 0;
}
static inline int security_bpf_token_capable(const struct bpf_token *token, int cap)
{
return 0;
}
#endif /* CONFIG_SECURITY */
#endif /* CONFIG_BPF_SYSCALL */