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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/gpu/host1x/Kconfig | |
| 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/gpu/host1x/Kconfig')
| -rw-r--r-- | drivers/gpu/host1x/Kconfig | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/gpu/host1x/Kconfig b/drivers/gpu/host1x/Kconfig new file mode 100644 index 000000000..e6c78ae20 --- /dev/null +++ b/drivers/gpu/host1x/Kconfig @@ -0,0 +1,30 @@ +# SPDX-License-Identifier: GPL-2.0-only + +config TEGRA_HOST1X_CONTEXT_BUS + bool + +config TEGRA_HOST1X + tristate "NVIDIA Tegra host1x driver" + depends on ARCH_TEGRA || COMPILE_TEST + select DMA_SHARED_BUFFER + select TEGRA_HOST1X_CONTEXT_BUS + select IOMMU_IOVA + help + Driver for the NVIDIA Tegra host1x hardware. + + The Tegra host1x module is the DMA engine for register access to + Tegra's graphics- and multimedia-related modules. The modules served + by host1x are referred to as clients. host1x includes some other + functionality, such as synchronization. + +if TEGRA_HOST1X + +config TEGRA_HOST1X_FIREWALL + bool "Enable HOST1X security firewall" + default y + help + Say yes if kernel should protect command streams from tampering. + + If unsure, choose Y. + +endif |