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[RFC,bpf-next,v3,01/16] bpf/verifier: allow more maps in sleepable bpf programs

Message ID 20240221-hid-bpf-sleepable-v3-1-1fb378ca6301@kernel.org (mailing list archive)
State New
Headers show
Series sleepable bpf_timer (was: allow HID-BPF to do device IOs) | expand

Commit Message

Benjamin Tissoires Feb. 21, 2024, 4:25 p.m. UTC 
These 2 maps types are required for HID-BPF when a user wants to do
IO with a device from a sleepable tracing point.

Allowing BPF_MAP_TYPE_QUEUE (and therefore BPF_MAP_TYPE_STACK) allows
for a BPF program to prepare from an IRQ the list of HID commands to send
back to the device and then these commands can be retrieved from the
sleepable trace point.

Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>

---

no changes in v3

changes in v2:
- dropped BPF_MAP_TYPE_PROG_ARRAY from the list
---
 kernel/bpf/verifier.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 011d54a1dc53..88e9d2e4c29f 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -18022,6 +18022,8 @@  static int check_map_prog_compatibility(struct bpf_verifier_env *env,
 		case BPF_MAP_TYPE_SK_STORAGE:
 		case BPF_MAP_TYPE_TASK_STORAGE:
 		case BPF_MAP_TYPE_CGRP_STORAGE:
+		case BPF_MAP_TYPE_QUEUE:
+		case BPF_MAP_TYPE_STACK:
 			break;
 		default:
 			verbose(env,