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David Verbeiren c602ad2b52 bpf: Zero-fill re-used per-cpu map element 
[ Upstream commit d3bec0138b ]

Zero-fill element values for all other cpus than current, just as
when not using prealloc. This is the only way the bpf program can
ensure known initial values for all cpus ('onallcpus' cannot be
set when coming from the bpf program).

The scenario is: bpf program inserts some elements in a per-cpu
map, then deletes some (or userspace does). When later adding
new elements using bpf_map_update_elem(), the bpf program can
only set the value of the new elements for the current cpu.
When prealloc is enabled, previously deleted elements are re-used.
Without the fix, values for other cpus remain whatever they were
when the re-used entry was previously freed.

A selftest is added to validate correct operation in above
scenario as well as in case of LRU per-cpu map element re-use.

Fixes: 6c90598174 ("bpf: pre-allocate hash map elements")
Signed-off-by: David Verbeiren <david.verbeiren@tessares.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20201104112332.15191-1-david.verbeiren@tessares.net
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2020-11-18 19:20:26 +01:00
..
gnu selftests/bpf: get rid of -D__x86_64__ 2017-05-03 09:51:25 -04:00
include/uapi/linux License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
map_tests selftests/bpf: add test_sysctl and map_tests/tests.h to .gitignore 2019-05-16 11:41:31 -07:00
prog_tests bpf: Zero-fill re-used per-cpu map element 2020-11-18 19:20:26 +01:00
progs bpf: Zero-fill re-used per-cpu map element 2020-11-18 19:20:26 +01:00
verifier bpf: Forbid XADD on spilled pointers for unprivileged users 2020-05-02 08:48:46 +02:00
.gitignore selftests/bpf: test_progs: convert test_tcp_rtt 2019-09-06 09:59:06 -07:00
Makefile selftests/bpf: add bpf-gcc support 2019-09-16 09:32:00 +02:00
bpf_endian.h selftests/bpf: introduce bpf_cpu_to_be64 and bpf_be64_to_cpu 2019-09-03 21:01:52 +02:00
bpf_helpers.h libbpf: Fix BTF-defined map's __type macro handling of arrays 2020-02-01 09:34:47 +00:00
bpf_rand.h bpf: add ld64 imm test cases 2018-05-14 19:11:45 -07:00
bpf_rlimit.h bpf: unify rlimit handling in selftests 2018-02-26 20:11:23 -08:00
bpf_util.h bpf: use libbpf_num_possible_cpus internally 2019-06-11 10:36:02 +02:00
cgroup_helpers.c selftests/bpf: Correct path to include msg + path 2019-12-31 16:43:33 +01:00
cgroup_helpers.h selftests/bpf: Fix const'ness in cgroup_helpers 2018-07-15 00:08:41 +02:00
config selftests/bpf: CONFIG_IPV6_SEG6_BPF required for test_seg6_loop.o 2020-06-22 09:31:08 +02:00
flow_dissector_load.c selftests/bpf: run flow dissector tests in skb-less mode 2019-04-23 18:36:34 +02:00
flow_dissector_load.h selftests/bpf: properly return error from bpf_flow_load 2019-04-23 18:36:34 +02:00
get_cgroup_id_user.c tools/bpf: fix selftest get_cgroup_id_user 2018-06-08 00:10:07 +02:00
netcnt_common.h selftests/bpf: cgroup local storage-based network counters 2018-10-01 16:18:33 +02:00
tcp_client.py selftests/bpf: use localhost in tcp_{server,client}.py 2019-02-04 21:29:27 +01:00
tcp_server.py selftests/bpf: use localhost in tcp_{server,client}.py 2019-02-04 21:29:27 +01:00
test_align.c selftests/bpf: fix test_align liveliness expectations 2019-07-06 00:16:56 +02:00
test_bpftool_build.sh tools: bpftool: improve and check builds for different make invocations 2019-08-31 00:38:16 +02:00
test_btf.c selftests/bpf: add trickier size resolution tests 2019-07-15 23:02:17 +02:00
test_btf.h bpf: Refactor BTF encoding macro to test_btf.h 2019-04-27 09:07:05 -07:00
test_btf_dump.c selftests/bpf: fix test_btf_dump with O= 2019-08-21 17:00:59 +02:00
test_cgroup_attach.c selftests/bpf: add auto-detach test 2019-05-28 09:30:02 -07:00
test_cgroup_storage.c selftests/bpf: fix test_cgroup_storage on s390 2019-08-21 16:55:01 +02:00
test_dev_cgroup.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
test_flow_dissector.c selftests: bpf: remove duplicated include 2019-01-29 00:09:26 +01:00
test_flow_dissector.sh selftests/bpf: Set rp_filter in test_flow_dissector 2019-10-08 23:59:22 +02:00
test_hashmap.c selftests/bpf: add tests for libbpf's hashmap 2019-05-24 14:05:57 -07:00
test_iptunnel_common.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
test_kmod.sh selftests: bpf: notification about privilege required to run test_kmod.sh testing script 2018-06-22 00:30:02 +02:00
test_libbpf.sh selftests/bpf: enable (uncomment) all tests in test_libbpf.sh 2018-11-07 22:20:56 +01:00
test_libbpf_open.c selftests/bpf: set RLIMIT_MEMLOCK properly for test_libbpf_open.c 2019-05-04 23:23:51 -07:00
test_lirc_mode2.sh media: bpf: add bpf function to report mouse movement 2018-12-09 14:37:18 -08:00
test_lirc_mode2_user.c media: bpf: add bpf function to report mouse movement 2018-12-09 14:37:18 -08:00
test_lpm_map.c bpf: lpm_trie: check left child of last leftmost node for NULL 2019-06-11 13:52:37 +02:00
test_lru_map.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206 2019-05-30 11:29:53 -07:00
test_lwt_ip_encap.sh selftests/bpf: More compatible nc options in test_lwt_ip_encap 2019-10-08 23:59:22 +02:00
test_lwt_seg6local.sh selftests/bpf: update test_lwt_seg6local.sh according to iproute2 2018-08-03 10:19:33 +02:00
test_maps.c selftests/bpf: Fix massive output from test_maps 2020-09-09 19:12:27 +02:00
test_maps.h bpf: Add BPF_MAP_TYPE_SK_STORAGE test to test_maps 2019-04-27 09:07:05 -07:00
test_netcnt.c selftests/bpf: fix incorrect users of create_and_get_cgroup 2019-01-07 13:15:55 -08:00
test_offload.py selftests: bpf: Skip write only files in debugfs 2019-11-01 15:16:01 -07:00
test_progs.c selftests/bpf: test_progs use another shell exit on non-actions 2020-08-21 13:05:31 +02:00
test_progs.h selftests/bpf: test_progs: convert test_sockopt_sk 2019-09-06 09:59:05 -07:00
test_queue_stack_map.h selftests/bpf: convert legacy BPF maps to BTF-defined ones 2019-07-05 22:52:25 +02:00
test_section_names.c selftests/bpf: test sockopt section name 2019-06-27 15:25:17 -07:00
test_select_reuseport.c selftest/bpf: fix backported test_select_reuseport selftest changes 2020-05-20 08:20:40 +02:00
test_select_reuseport_common.h bpf: Test BPF_PROG_TYPE_SK_REUSEPORT 2018-08-11 01:58:46 +02:00
test_skb_cgroup_id.sh kselftests/bpf: use ping6 as the default ipv6 ping binary if it exists 2018-10-31 23:05:30 +01:00
test_skb_cgroup_id_user.c selftests/bpf: fix incorrect users of create_and_get_cgroup 2019-01-07 13:15:55 -08:00
test_sock.c selftests/bpf: fix "bind{4, 6} deny specific IP & port" on s390 2019-08-14 22:51:35 +02:00
test_sock_addr.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-17 20:20:36 -07:00
test_sock_addr.sh kselftests/bpf: use ping6 as the default ipv6 ping binary if it exists 2018-10-31 23:05:30 +01:00
test_sock_fields.c selftests: bpf: enable hi32 randomization for all tests 2019-05-24 18:58:37 -07:00
test_socket_cookie.c selftests/bpf: convert socket_cookie test to sk storage 2019-06-15 01:21:59 +02:00
test_sockmap.c selftests: bpf: Use a temporary file in test_sockmap 2020-02-11 04:35:30 -08:00
test_sockmap_kern.h selftests/bpf: convert legacy BPF maps to BTF-defined ones 2019-07-05 22:52:25 +02:00
test_stub.c selftests: bpf: enable hi32 randomization for all tests 2019-05-24 18:58:37 -07:00
test_sysctl.c bpf: Allow narrow loads of bpf_sysctl fields with offset > 0 2019-10-30 12:49:13 -07:00
test_tag.c bpf: unify rlimit handling in selftests 2018-02-26 20:11:23 -08:00
test_tc_edt.sh selftests/bpf: More compatible nc options in test_tc_edt 2019-10-18 22:33:57 +02:00
test_tc_tunnel.sh selftests, bpf: Fix test_tc_tunnel hanging 2019-12-31 16:45:38 +01:00
test_tcp_check_syncookie.sh selftests/bpf: add test for bpf_tcp_gen_syncookie 2019-07-30 21:03:05 -07:00
test_tcp_check_syncookie_user.c selftests/bpf: add test for bpf_tcp_gen_syncookie 2019-07-30 21:03:05 -07:00
test_tcpbpf.h selftests/bpf: De-flake test_tcpbpf 2020-10-01 13:17:23 +02:00
test_tcpbpf_user.c selftests/bpf: De-flake test_tcpbpf 2020-10-01 13:17:23 +02:00
test_tcpnotify.h selftests/bpf: add a test case for sock_ops perf-event notification 2018-11-09 09:40:17 +01:00
test_tcpnotify_user.c selftests/bpf: switch test_tcpnotify to perf_buffer API 2019-07-23 16:05:42 -07:00
test_tunnel.sh selftests/bpf: fail test_tunnel.sh if subtests fail 2019-05-28 11:08:57 +02:00
test_verifier.c selftests/bpf: verifier precise tests 2019-08-28 00:30:11 +02:00
test_verifier_log.c bpf: unify rlimit handling in selftests 2018-02-26 20:11:23 -08:00
test_xdp_meta.sh tools/bpf: fix batch-mode test failure of test_xdp_redirect.sh 2018-02-06 11:34:42 +01:00
test_xdp_redirect.sh tools/bpf: fix batch-mode test failure of test_xdp_redirect.sh 2018-02-06 11:34:42 +01:00
test_xdp_veth.sh selftests, bpf: Add test for veth native XDP 2019-06-24 18:18:30 -07:00
test_xdp_vlan.sh selftests/bpf: reduce time to execute test_xdp_vlan.sh 2019-08-05 11:17:40 -07:00
test_xdp_vlan_mode_generic.sh selftests/bpf: add wrapper scripts for test_xdp_vlan.sh 2019-08-05 11:17:40 -07:00
test_xdp_vlan_mode_native.sh selftests/bpf: add wrapper scripts for test_xdp_vlan.sh 2019-08-05 11:17:40 -07:00
test_xdping.sh selftests/bpf: measure RTT from xdp using xdping 2019-05-31 19:53:45 -07:00
trace_helpers.c selftests/bpf: remove perf buffer helpers 2019-07-23 16:05:42 -07:00
trace_helpers.h selftests/bpf: remove perf buffer helpers 2019-07-23 16:05:42 -07:00
urandom_read.c selftests: bpf: modify urandom_read and link it non-statically 2019-03-21 19:37:30 -07:00
with_addr.sh selftests/bpf: test bpf flow dissection 2018-09-14 12:04:33 -07:00
with_tunnels.sh selftests/bpf: test bpf flow dissection 2018-09-14 12:04:33 -07:00
xdping.c selftests: bpf: correct perror strings 2019-12-04 22:31:03 +01:00
xdping.h selftests/bpf: measure RTT from xdp using xdping 2019-05-31 19:53:45 -07:00