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| author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2026-09-04 10:43:19 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-09-04 07:58:36 -0700 |
| commit | 6668ed271eaefaa63e686bdfbedaeb7b8e492722 (patch) | |
| tree | 58e8288fead484f6755ad0815fc74c3742663761 /drivers/hid/hid-lg4ff.h | |
| download | linux-stable-6668ed271eaefaa63e686bdfbedaeb7b8e492722.tar.gz linux-stable-6668ed271eaefaa63e686bdfbedaeb7b8e492722.zip | |
selftests/bpf: Reject graph kptr use after RCU unlockgrafted
Add a sleepable verifier test that loads a graph-node local kptr in an
explicit RCU read-side critical section, then passes its node to
bpf_rbtree_remove() after the section ends.
Before the verifier fix, the stale NON_OWN_REF flag makes the node look like
a live borrowed reference and the program is accepted. After the fix, the
pointer is demoted without NON_OWN_REF and the graph kfunc argument is
rejected.
Also exercise a graph kptr loaded while a spin lock provides implicit RCU
protection. The pointer must be invalidated when the lock is released, which
guards the required ordering between non-owning-reference invalidation and
RCU demotion.
Update the existing fault-protected load test state description. The
post-unlock pointer no longer carries NON_OWN_REF, but remains readable
because the load is rewritten to use BPF_PROBE_MEM.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'drivers/hid/hid-lg4ff.h')
| -rw-r--r-- | drivers/hid/hid-lg4ff.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/hid/hid-lg4ff.h b/drivers/hid/hid-lg4ff.h new file mode 100644 index 000000000..e5c55d515 --- /dev/null +++ b/drivers/hid/hid-lg4ff.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __HID_LG4FF_H +#define __HID_LG4FF_H + +#ifdef CONFIG_LOGIWHEELS_FF +extern int lg4ff_no_autoswitch; /* From hid-lg.c */ + +int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field, + struct hid_usage *usage, s32 value, struct lg_drv_data *drv_data); +int lg4ff_raw_event(struct hid_device *hdev, struct hid_report *report, + u8 *rd, int size, struct lg_drv_data *drv_data); +int lg4ff_init(struct hid_device *hdev); +int lg4ff_deinit(struct hid_device *hdev); +#else +static inline int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field, + struct hid_usage *usage, s32 value, struct lg_drv_data *drv_data) { return 0; } +static inline int lg4ff_raw_event(struct hid_device *hdev, struct hid_report *report, + u8 *rd, int size, struct lg_drv_data *drv_data) { return 0; } +static inline int lg4ff_init(struct hid_device *hdev) { return -1; } +static inline int lg4ff_deinit(struct hid_device *hdev) { return -1; } +#endif + +#endif |