From 506ada89629ec7059b96ecfb0dc7d33ece0103ca Mon Sep 17 00:00:00 2001 From: Eduard Zingerman Date: Fri, 4 Sep 2026 17:05:56 -0700 Subject: bpf: mark a NULL kfunc argument precise check_kfunc_arg() allows bpf_register_is_null() for nullable arguments w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. Fixes: 3bda08b63670 ("bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)") Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com Signed-off-by: Alexei Starovoitov --- fs/ceph/ceph_frag.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 fs/ceph/ceph_frag.c (limited to 'fs/ceph/ceph_frag.c') diff --git a/fs/ceph/ceph_frag.c b/fs/ceph/ceph_frag.c new file mode 100644 index 000000000..6f67d5b88 --- /dev/null +++ b/fs/ceph/ceph_frag.c @@ -0,0 +1,23 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Ceph 'frag' type + */ +#include +#include + +int ceph_frag_compare(__u32 a, __u32 b) +{ + unsigned va = ceph_frag_value(a); + unsigned vb = ceph_frag_value(b); + if (va < vb) + return -1; + if (va > vb) + return 1; + va = ceph_frag_bits(a); + vb = ceph_frag_bits(b); + if (va < vb) + return -1; + if (va > vb) + return 1; + return 0; +} -- cgit v1.3.1