bpf: add destructive kfunc flag

Add KF_DESTRUCTIVE flag for destructive functions. Functions with this
flag set will require CAP_SYS_BOOT capabilities.

Signed-off-by: Artem Savkov <asavkov@redhat.com>
Link: https://lore.kernel.org/r/20220810065905.475418-2-asavkov@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/Documentation/bpf/kfuncs.rst b/Documentation/bpf/kfuncs.rst
index c8b21de..7817317 100644 (file)
--- a/Documentation/bpf/kfuncs.rst
+++ b/Documentation/bpf/kfuncs.rst
@@ -152,6 +152,15 @@ ensure the integrity of the operation being performed on the expected object.
 The KF_SLEEPABLE flag is used for kfuncs that may sleep. Such kfuncs can only
 be called by sleepable BPF programs (BPF_F_SLEEPABLE).
 
+2.4.7 KF_DESTRUCTIVE flag
+--------------------------
+
+The KF_DESTRUCTIVE flag is used to indicate functions calling which is
+destructive to the system. For example such a call can result in system
+rebooting or panicking. Due to this additional restrictions apply to these
+calls. At the moment they only require CAP_SYS_BOOT capability, but more can be
+added later.
+
 2.5 Registering the kfuncs
 --------------------------
 

diff --git a/include/linux/btf.h b/include/linux/btf.h
index 976cbdd..ad93c2d 100644 (file)
--- a/include/linux/btf.h
+++ b/include/linux/btf.h
@@ -49,7 +49,8 @@
  * for this case.
  */
 #define KF_TRUSTED_ARGS (1 << 4) /* kfunc only takes trusted pointer arguments */
-#define KF_SLEEPABLE   (1 << 5) /* kfunc may sleep */
+#define KF_SLEEPABLE    (1 << 5) /* kfunc may sleep */
+#define KF_DESTRUCTIVE  (1 << 6) /* kfunc performs destructive actions */
 
 struct btf;
 struct btf_member;

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 28b02dc..2c1f806 100644 (file)
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -7584,6 +7584,11 @@ static int check_kfunc_call(struct bpf_verifier_env *env, struct bpf_insn *insn,
                        func_name);
                return -EACCES;
        }
+       if (*kfunc_flags & KF_DESTRUCTIVE && !capable(CAP_SYS_BOOT)) {
+               verbose(env, "destructive kfunc calls require CAP_SYS_BOOT capabilities\n");
+               return -EACCES;
+       }
+
        acq = *kfunc_flags & KF_ACQUIRE;
 
        /* Check the arguments */