mainline inclusion
from mainline-5.12-rc1
commit 792001f4
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5EUVD
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=792001f4f7aa036b1f1c1ed7bce44bb49126208a

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Add BPF_CORE_READ_USER(), BPF_CORE_READ_USER_STR() and their _INTO()
variations to allow reading CO-RE-relocatable kernel data structures from the
user-space. One of such cases is reading input arguments of syscalls, while
reaping the benefits of CO-RE relocations w.r.t. handling 32/64 bit
conversions and handling missing/new fields in UAPI data structs.
Suggested-by: NGilad Reti <gilad.reti@gmail.com>
Signed-off-by: NAndrii Nakryiko <andrii@kernel.org>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20201218235614.2284956-2-andrii@kernel.orgSigned-off-by: NAlexei Starovoitov <ast@kernel.org>
(cherry picked from commit 792001f4)
Signed-off-by: NWang Yufen <wangyufen@huawei.com>