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 --- include/uapi/asm-generic/Kbuild | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 include/uapi/asm-generic/Kbuild (limited to 'include/uapi/asm-generic/Kbuild') diff --git a/include/uapi/asm-generic/Kbuild b/include/uapi/asm-generic/Kbuild new file mode 100644 index 000000000..ebb180aac --- /dev/null +++ b/include/uapi/asm-generic/Kbuild @@ -0,0 +1,36 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Headers that are mandatory in usr/include/asm/ +# (This file is not included when SRCARCH=um since UML does not support UAPI.) + +mandatory-y += auxvec.h +mandatory-y += bitsperlong.h +mandatory-y += bpf_perf_event.h +mandatory-y += byteorder.h +mandatory-y += errno.h +mandatory-y += fcntl.h +mandatory-y += ioctl.h +mandatory-y += ioctls.h +mandatory-y += ipcbuf.h +mandatory-y += mman.h +mandatory-y += msgbuf.h +mandatory-y += param.h +mandatory-y += poll.h +mandatory-y += posix_types.h +mandatory-y += ptrace.h +mandatory-y += resource.h +mandatory-y += sembuf.h +mandatory-y += setup.h +mandatory-y += shmbuf.h +mandatory-y += sigcontext.h +mandatory-y += siginfo.h +mandatory-y += signal.h +mandatory-y += socket.h +mandatory-y += sockios.h +mandatory-y += stat.h +mandatory-y += statfs.h +mandatory-y += swab.h +mandatory-y += termbits.h +mandatory-y += termios.h +mandatory-y += types.h +mandatory-y += unistd.h -- cgit v1.3.1