From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock 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 Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- fs/ecryptfs/Kconfig | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 fs/ecryptfs/Kconfig (limited to 'fs/ecryptfs/Kconfig') diff --git a/fs/ecryptfs/Kconfig b/fs/ecryptfs/Kconfig new file mode 100644 index 000000000..c2f4fb41b --- /dev/null +++ b/fs/ecryptfs/Kconfig @@ -0,0 +1,23 @@ +# SPDX-License-Identifier: GPL-2.0-only +config ECRYPT_FS + tristate "eCrypt filesystem layer support" + depends on KEYS && CRYPTO && (ENCRYPTED_KEYS || ENCRYPTED_KEYS=n) + select CRYPTO_ECB + select CRYPTO_CBC + select CRYPTO_LIB_MD5 + help + Encrypted filesystem that operates on the VFS layer. See + to learn more about + eCryptfs. Userspace components are required and can be + obtained from . + + To compile this file system support as a module, choose M here: the + module will be called ecryptfs. + +config ECRYPT_FS_MESSAGING + bool "Enable notifications for userspace key wrap/unwrap" + depends on ECRYPT_FS + help + Enables the /dev/ecryptfs entry for use by ecryptfsd. This allows + for userspace to wrap/unwrap file encryption keys by other + backends, like OpenSSL. -- cgit v1.3.1