diff options
| author | Artem Savkov <asavkov@redhat.com> | 2022-08-10 08:59:03 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-08-10 09:22:18 -0700 |
| commit | 4dd48c6f1f83290d4bc61b43e61d86f8bc6c310e (patch) | |
| tree | 9c01d2a53dac7963116e41142333f73b27d1aa79 /kernel/bpf/verifier.c | |
| parent | 3143d10b094596f3e5d5964b2660375e586652a3 (diff) | |
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>
Diffstat (limited to 'kernel/bpf/verifier.c')
| -rw-r--r-- | kernel/bpf/verifier.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 28b02dc67a2a..2c1f8069f7b7 100644 --- 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 */ |