diff options
| 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 /include/drm/clients | |
| 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 'include/drm/clients')
| -rw-r--r-- | include/drm/clients/drm_client_setup.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/drm/clients/drm_client_setup.h b/include/drm/clients/drm_client_setup.h new file mode 100644 index 000000000..46aab3fb4 --- /dev/null +++ b/include/drm/clients/drm_client_setup.h @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: MIT */ + +#ifndef DRM_CLIENT_SETUP_H +#define DRM_CLIENT_SETUP_H + +#include <linux/types.h> + +struct drm_device; +struct drm_format_info; + +#if defined(CONFIG_DRM_CLIENT_SETUP) +void drm_client_setup(struct drm_device *dev, const struct drm_format_info *format); +void drm_client_setup_with_fourcc(struct drm_device *dev, u32 fourcc); +void drm_client_setup_with_color_mode(struct drm_device *dev, unsigned int color_mode); +#else +static inline void drm_client_setup(struct drm_device *dev, + const struct drm_format_info *format) +{ } +static inline void drm_client_setup_with_fourcc(struct drm_device *dev, u32 fourcc) +{ } +static inline void drm_client_setup_with_color_mode(struct drm_device *dev, + unsigned int color_mode) +{ } +#endif + +#endif |