summaryrefslogtreecommitdiffstats
path: root/kernel/bpf/core.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/bpf/core.c')
-rw-r--r--kernel/bpf/core.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 49b5538a5301..70f0821aca47 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -761,15 +761,22 @@ static int bpf_check_tail_call(const struct bpf_prog *fp)
/**
* bpf_prog_select_runtime - select exec runtime for BPF program
* @fp: bpf_prog populated with internal BPF program
+ * @err: pointer to error variable
*
* Try to JIT eBPF program, if JIT is not available, use interpreter.
* The BPF program will be executed via BPF_PROG_RUN() macro.
*/
-int bpf_prog_select_runtime(struct bpf_prog *fp)
+struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err)
{
fp->bpf_func = (void *) __bpf_prog_run;
- bpf_int_jit_compile(fp);
+ /* eBPF JITs can rewrite the program in case constant
+ * blinding is active. However, in case of error during
+ * blinding, bpf_int_jit_compile() must always return a
+ * valid program, which in this case would simply not
+ * be JITed, but falls back to the interpreter.
+ */
+ fp = bpf_int_jit_compile(fp);
bpf_prog_lock_ro(fp);
/* The tail call compatibility check can only be done at
@@ -777,7 +784,9 @@ int bpf_prog_select_runtime(struct bpf_prog *fp)
* with JITed or non JITed program concatenations and not
* all eBPF JITs might immediately support all features.
*/
- return bpf_check_tail_call(fp);
+ *err = bpf_check_tail_call(fp);
+
+ return fp;
}
EXPORT_SYMBOL_GPL(bpf_prog_select_runtime);
@@ -859,8 +868,9 @@ const struct bpf_func_proto bpf_tail_call_proto = {
};
/* For classic BPF JITs that don't implement bpf_int_jit_compile(). */
-void __weak bpf_int_jit_compile(struct bpf_prog *prog)
+struct bpf_prog * __weak bpf_int_jit_compile(struct bpf_prog *prog)
{
+ return prog;
}
bool __weak bpf_helper_changes_skb_data(void *func)