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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/nfc/pn544/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/nfc/pn544/Kconfig')
| -rw-r--r-- | drivers/nfc/pn544/Kconfig | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/nfc/pn544/Kconfig b/drivers/nfc/pn544/Kconfig new file mode 100644 index 000000000..0fdc3108c --- /dev/null +++ b/drivers/nfc/pn544/Kconfig @@ -0,0 +1,31 @@ +# SPDX-License-Identifier: GPL-2.0-only +config NFC_PN544 + tristate + select CRC_CCITT + help + NXP PN544 core driver. + This is a driver based on the HCI NFC kernel layers and + will thus not work with NXP libnfc library. + +config NFC_PN544_I2C + tristate "NXP PN544 device support (I2C)" + depends on NFC_HCI && I2C && NFC_SHDLC + select NFC_PN544 + help + This module adds support for the NXP pn544 i2c interface. + Select this if your platform is using the i2c bus. + + If you choose to build a module, it'll be called pn544_i2c. + Say N if unsure. + +config NFC_PN544_MEI + tristate "NXP PN544 device support (MEI)" + depends on NFC_HCI && NFC_MEI_PHY + select NFC_PN544 + help + This module adds support for the mei interface of adapters using + NXP pn544 chipsets. Select this if your pn544 chipset + is handled by Intel's Management Engine Interface on your platform. + + If you choose to build a module, it'll be called pn544_mei. + Say N if unsure. |