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[bpf-next,2/3] bpf: Allow calling bpf_jit_blinding_enabled() with a NULL program

Message ID 20241104200452.2651529-3-minipli@grsecurity.net (mailing list archive)
State New
Delegated to: BPF
Headers show
Series test_bpf.ko blinding fixes | expand

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Commit Message

Mathias Krause Nov. 4, 2024, 8:04 p.m. UTC 
To allow probing if constant blinding will be applied, support calling
bpf_jit_blinding_enabled() with a NULL program.

This allows to tailor the creation of a BPF program accordingly.

Signed-off-by: Mathias Krause <minipli@grsecurity.net>
---
 include/linux/filter.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/include/linux/filter.h b/include/linux/filter.h
index 7d7578a8eac1..a1b4a9739f81 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -1297,11 +1297,12 @@  static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
 	 */
 	if (!bpf_jit_is_ebpf())
 		return false;
-	if (!prog->jit_requested)
+	if (prog && !prog->jit_requested)
 		return false;
 	if (!bpf_jit_harden)
 		return false;
-	if (bpf_jit_harden == 1 && bpf_token_capable(prog->aux->token, CAP_BPF))
+	if (bpf_jit_harden == 1 &&
+	    bpf_token_capable(prog ? prog->aux->token : NULL, CAP_BPF))
 		return false;
 
 	return true;