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authorAlexei Starovoitov <ast@kernel.org>2021-05-13 17:36:03 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2021-05-19 00:33:39 +0200
commit79a7f8bdb159d9914b58740f3d31d602a6e4aca8 (patch)
tree4713544ec684ad91106265a60d4275e96a9e9064 /net
parentfa7b83bf3b156c767f3e4a25bbf3817b08f3ff8e (diff)
bpf: Introduce bpf_sys_bpf() helper and program type.
Add placeholders for bpf_sys_bpf() helper and new program type. Make sure to check that expected_attach_type is zero for future extensibility. Allow tracing helper functions to be used in this program type, since they will only execute from user context via bpf_prog_test_run. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210514003623.28033-2-alexei.starovoitov@gmail.com
Diffstat (limited to 'net')
-rw-r--r--net/bpf/test_run.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index a5d72c48fb66..a6972d7ddf80 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -918,3 +918,46 @@ out:
kfree(user_ctx);
return ret;
}
+
+int bpf_prog_test_run_syscall(struct bpf_prog *prog,
+ const union bpf_attr *kattr,
+ union bpf_attr __user *uattr)
+{
+ void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
+ __u32 ctx_size_in = kattr->test.ctx_size_in;
+ void *ctx = NULL;
+ u32 retval;
+ int err = 0;
+
+ /* doesn't support data_in/out, ctx_out, duration, or repeat or flags */
+ if (kattr->test.data_in || kattr->test.data_out ||
+ kattr->test.ctx_out || kattr->test.duration ||
+ kattr->test.repeat || kattr->test.flags)
+ return -EINVAL;
+
+ if (ctx_size_in < prog->aux->max_ctx_offset ||
+ ctx_size_in > U16_MAX)
+ return -EINVAL;
+
+ if (ctx_size_in) {
+ ctx = kzalloc(ctx_size_in, GFP_USER);
+ if (!ctx)
+ return -ENOMEM;
+ if (copy_from_user(ctx, ctx_in, ctx_size_in)) {
+ err = -EFAULT;
+ goto out;
+ }
+ }
+ retval = bpf_prog_run_pin_on_cpu(prog, ctx);
+
+ if (copy_to_user(&uattr->test.retval, &retval, sizeof(u32))) {
+ err = -EFAULT;
+ goto out;
+ }
+ if (ctx_size_in)
+ if (copy_to_user(ctx_in, ctx, ctx_size_in))
+ err = -EFAULT;
+out:
+ kfree(ctx);
+ return err;
+}