From: YiFei Zhu <yifeifz2@xxxxxxxxxxxx>
This hooks takes no argument, and returns 0 if the current task is
permitted to use extended seccomp-eBPF features, or -errno if it is
not permitted.
Signed-off-by: YiFei Zhu <yifeifz2@xxxxxxxxxxxx>
---
include/linux/lsm_hook_defs.h | 4 ++++
include/linux/security.h | 13 +++++++++++++
security/security.c | 8 ++++++++
3 files changed, 25 insertions(+)
diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index 61f04f7dc1a4..94e18d95e1cc 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -391,6 +391,10 @@ LSM_HOOK(int, 0, bpf_map_alloc_security, struct bpf_map *map)
LSM_HOOK(void, LSM_RET_VOID, bpf_map_free_security, struct bpf_map *map)
LSM_HOOK(int, 0, bpf_prog_alloc_security, struct bpf_prog_aux *aux)
LSM_HOOK(void, LSM_RET_VOID, bpf_prog_free_security, struct bpf_prog_aux *aux)
+
+#ifdef CONFIG_SECCOMP_FILTER_EXTENDED
+LSM_HOOK(int, 0, seccomp_extended, void)
+#endif /* CONFIG_SECCOMP_FILTER_EXTENDED */
#endif /* CONFIG_BPF_SYSCALL */
LSM_HOOK(int, 0, locked_down, enum lockdown_reason what)
diff --git a/include/linux/security.h b/include/linux/security.h
index 9aeda3f9e838..8e98dd98ac90 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1960,6 +1960,11 @@ extern int security_bpf_map_alloc(struct bpf_map *map);
extern void security_bpf_map_free(struct bpf_map *map);
extern int security_bpf_prog_alloc(struct bpf_prog_aux *aux);
extern void security_bpf_prog_free(struct bpf_prog_aux *aux);
+
+#ifdef CONFIG_SECCOMP_FILTER_EXTENDED
+extern int security_seccomp_extended(void);
+#endif /* CONFIG_SECCOMP_FILTER_EXTENDED */
+
#else
static inline int security_bpf(int cmd, union bpf_attr *attr,
unsigned int size)
@@ -1992,6 +1997,14 @@ static inline int security_bpf_prog_alloc(struct bpf_prog_aux *aux)
static inline void security_bpf_prog_free(struct bpf_prog_aux *aux)
{ }
+
+#ifdef CONFIG_SECCOMP_FILTER_EXTENDED
+static inline int security_seccomp_extended(void)
+{
+ return 0;
+}
+#endif /* CONFIG_SECCOMP_FILTER_EXTENDED */
+
#endif /* CONFIG_SECURITY */
#endif /* CONFIG_BPF_SYSCALL */
diff --git a/security/security.c b/security/security.c
index 94383f83ba42..301afe76ffb2 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2553,6 +2553,14 @@ void security_bpf_prog_free(struct bpf_prog_aux *aux)
{
call_void_hook(bpf_prog_free_security, aux);
}
+
+#ifdef CONFIG_SECCOMP_FILTER_EXTENDED
+int security_seccomp_extended(void)
+{
+ return call_int_hook(seccomp_extended, 0);
+}
+#endif
+
#endif /* CONFIG_BPF_SYSCALL */
int security_locked_down(enum lockdown_reason what)
--
2.31.1
