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/smb/Kconfig | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 fs/smb/Kconfig (limited to 'fs/smb/Kconfig') diff --git a/fs/smb/Kconfig b/fs/smb/Kconfig new file mode 100644 index 000000000..e549e189e --- /dev/null +++ b/fs/smb/Kconfig @@ -0,0 +1,29 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# smbfs configuration + +source "fs/smb/client/Kconfig" +source "fs/smb/server/Kconfig" +source "fs/smb/smbdirect/Kconfig" + +config SMBFS + tristate + default y if CIFS=y || SMB_SERVER=y + default m if CIFS=m || SMB_SERVER=m + +config SMB_KUNIT_TESTS + tristate "KUnit tests for SMB" if !KUNIT_ALL_TESTS + depends on SMBFS && KUNIT + default KUNIT_ALL_TESTS + help + This builds the SMB KUnit tests. + + KUnit tests run during boot and output the results to the debug log + in TAP format (https://testanything.org/). Only useful for kernel devs + running KUnit test harness and are not for inclusion into a production + build. + + For more information on KUnit and unit tests in general please refer + to the KUnit documentation in Documentation/dev-tools/kunit/. + + If unsure, say N. -- cgit v1.3.1