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2021-08-17bpf: Refactor BPF_PROG_RUN into a functionAndrii Nakryiko
Turn BPF_PROG_RUN into a proper always inlined function. No functional and performance changes are intended, but it makes it much easier to understand what's going on with how BPF programs are actually get executed. It's more obvious what types and callbacks are expected. Also extra () around input parameters can be dropped, as well as `__` variable prefixes intended to avoid naming collisions, which makes the code simpler to read and write. This refactoring also highlighted one extra issue. BPF_PROG_RUN is both a macro and an enum value (BPF_PROG_RUN == BPF_PROG_TEST_RUN). Turning BPF_PROG_RUN into a function causes naming conflict compilation error. So rename BPF_PROG_RUN into lower-case bpf_prog_run(), similar to bpf_prog_run_xdp(), bpf_prog_run_pin_on_cpu(), etc. All existing callers of BPF_PROG_RUN, the macro, are switched to bpf_prog_run() explicitly. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210815070609.987780-2-andrii@kernel.org
2021-08-16bpf, tests: Fix spelling mistake "shoft" -> "shift"Colin Ian King
There is a spelling mistake in a literal string. Fix it. Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210815213950.47751-1-colin.king@canonical.com
2021-08-10bpf, tests: Add tail call test suiteJohan Almbladh
While BPF_CALL instructions were tested implicitly by the cBPF-to-eBPF translation, there has not been any tests for BPF_TAIL_CALL instructions. The new test suite includes tests for tail call chaining, tail call count tracking and error paths. It is mainly intended for JIT development and testing. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210809091829.810076-15-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Add tests for BPF_CMPXCHGJohan Almbladh
Tests for BPF_CMPXCHG with both word and double word operands. As with the tests for other atomic operations, these tests only check the result of the arithmetic operation. The atomicity of the operations is not tested. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210809091829.810076-14-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Add tests for atomic operationsJohan Almbladh
Tests for each atomic arithmetic operation and BPF_XCHG, derived from old BPF_XADD tests. The tests include BPF_W/DW and BPF_FETCH variants. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210809091829.810076-13-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Add test for 32-bit context pointer argument passingJohan Almbladh
On a 32-bit architecture, the context pointer will occupy the low half of R1, and the other half will be zero. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210809091829.810076-12-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Add branch conversion JIT testJohan Almbladh
Some JITs may need to convert a conditional jump instruction to to short PC-relative branch and a long unconditional jump, if the PC-relative offset exceeds offset field width in the CPU instruction. This test triggers such branch conversion on the 32-bit MIPS JIT. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210809091829.810076-11-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Add word-order tests for load/store of double wordsJohan Almbladh
A double word (64-bit) load/store may be implemented as two successive 32-bit operations, one for each word. Check that the order of those operations is consistent with the machine endianness. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210809091829.810076-10-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Add tests for ALU operations implemented with function callsJohan Almbladh
32-bit JITs may implement complex ALU64 instructions using function calls. The new tests check aspects related to this, such as register clobbering and register argument re-ordering. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210809091829.810076-9-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Add more ALU64 BPF_MUL testsJohan Almbladh
This patch adds BPF_MUL tests for 64x32 and 64x64 multiply. Mainly testing 32-bit JITs that implement ALU64 operations with two 32-bit CPU registers per operand. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210809091829.810076-8-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Add more BPF_LSH/RSH/ARSH tests for ALU64Johan Almbladh
This patch adds a number of tests for BPF_LSH, BPF_RSH amd BPF_ARSH ALU64 operations with values that may trigger different JIT code paths. Mainly testing 32-bit JITs that implement ALU64 operations with two 32-bit CPU registers per operand. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210809091829.810076-7-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Add more ALU32 tests for BPF_LSH/RSH/ARSHJohan Almbladh
This patch adds more tests of ALU32 shift operations BPF_LSH and BPF_RSH, including the special case of a zero immediate. Also add corresponding BPF_ARSH tests which were missing for ALU32. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210809091829.810076-6-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Add more tests of ALU32 and ALU64 bitwise operationsJohan Almbladh
This patch adds tests of BPF_AND, BPF_OR and BPF_XOR with different magnitude of the immediate value. Mainly checking 32-bit JIT sub-word handling and zero/sign extension. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210809091829.810076-5-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Fix typos in test case descriptionsJohan Almbladh
This patch corrects the test description in a number of cases where the description differed from what was actually tested and expected. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210809091829.810076-4-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Add BPF_MOV tests for zero and sign extensionJohan Almbladh
Tests for ALU32 and ALU64 MOV with different sizes of the immediate value. Depending on the immediate field width of the native CPU instructions, a JIT may generate code differently depending on the immediate value. Test that zero or sign extension is performed as expected. Mainly for JIT testing. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210809091829.810076-3-johan.almbladh@anyfinetworks.com
2021-08-10bpf, tests: Add BPF_JMP32 test casesJohan Almbladh
An eBPF JIT may implement JMP32 operations in a different way than JMP, especially on 32-bit architectures. This patch adds a series of tests for JMP32 operations, mainly for testing JITs. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210809091829.810076-2-johan.almbladh@anyfinetworks.com
2021-07-23bpf/tests: Do not PASS tests without actually testing the resultJohan Almbladh
Each test case can have a set of sub-tests, where each sub-test can run the cBPF/eBPF test snippet with its own data_size and expected result. Before, the end of the sub-test array was indicated by both data_size and result being zero. However, most or all of the internal eBPF tests has a data_size of zero already. When such a test also had an expected value of zero, the test was never run but reported as PASS anyway. Now the test runner always runs the first sub-test, regardless of the data_size and result values. The sub-test array zero-termination only applies for any additional sub-tests. There are other ways fix it of course, but this solution at least removes the surprise of eBPF tests with a zero result always succeeding. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210721103822.3755111-1-johan.almbladh@anyfinetworks.com
2021-07-23bpf/tests: Fix copy-and-paste error in double word testJohan Almbladh
This test now operates on DW as stated instead of W, which was already covered by another test. Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210721104058.3755254-1-johan.almbladh@anyfinetworks.com
2021-07-08lib/test: fix spelling mistakesZhen Lei
Fix some spelling mistakes in comments found by "codespell": thats ==> that's unitialized ==> uninitialized panicing ==> panicking sucess ==> success possitive ==> positive intepreted ==> interpreted Link: https://lkml.kernel.org/r/20210607133036.12525-2-thunder.leizhen@huawei.com Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Acked-by: Yonghong Song <yhs@fb.com> [test_bfp.c] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-01-20test_bpf: Remove EXPECTED_FAIL flag from bpf_fill_maxinsns11Gary Lin
With NOPs padding, x64 jit now can handle the jump cases like bpf_fill_maxinsns11(). Signed-off-by: Gary Lin <glin@suse.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210119102501.511-3-glin@suse.com
2021-01-14bpf: Rename BPF_XADD and prepare to encode other atomics in .immBrendan Jackman
A subsequent patch will add additional atomic operations. These new operations will use the same opcode field as the existing XADD, with the immediate discriminating different operations. In preparation, rename the instruction mode BPF_ATOMIC and start calling the zero immediate BPF_ADD. This is possible (doesn't break existing valid BPF progs) because the immediate field is currently reserved MBZ and BPF_ADD is zero. All uses are removed from the tree but the BPF_XADD definition is kept around to avoid breaking builds for people including kernel headers. Signed-off-by: Brendan Jackman <jackmanb@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Björn Töpel <bjorn.topel@gmail.com> Link: https://lore.kernel.org/bpf/20210114181751.768687-5-jackmanb@google.com
2020-07-16bpf: revert "test_bpf: Flag tests that cannot be jited on s390"Seth Forshee
This reverts commit 3203c9010060 ("test_bpf: flag tests that cannot be jited on s390"). The s390 bpf JIT previously had a restriction on the maximum program size, which required some tests in test_bpf to be flagged as expected failures. The program size limitation has been removed, and the tests now pass, so these tests should no longer be flagged. Fixes: d1242b10ff03 ("s390/bpf: Remove JITed image size limitations") Signed-off-by: Seth Forshee <seth.forshee@canonical.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com> Link: https://lore.kernel.org/bpf/20200716143931.330122-1-seth.forshee@canonical.com
2020-02-24bpf/tests: Use migrate disable instead of preempt disableDavid Miller
Replace the preemption disable/enable with migrate_disable/enable() to reflect the actual requirement and to allow PREEMPT_RT to substitute it with an actual migration disable mechanism which does not disable preemption. [ tglx: Switched it over to migrate disable ] Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200224145643.785306549@linutronix.de
2019-10-30bpf, testing: Introduce 'gso_linear_no_head_frag' skb_segment testShmulik Ladkani
Following reports of skb_segment() hitting a BUG_ON when working on GROed skbs which have their gso_size mangled (e.g. after a bpf_skb_change_proto call), add a reproducer test that mimics the input skbs that lead to the mentioned BUG_ON as in [1] and validates the fix submitted in [2]. [1] https://lists.openwall.net/netdev/2019/08/26/110 [2] commit 3dcbdb134f32 ("net: gso: Fix skb_segment splat when splitting gso_size mangled skb having linear-headed frag_list") Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20191025134223.2761-3-shmulik.ladkani@gmail.com
2019-10-30bpf, testing: Refactor test_skb_segment() for testing skb_segment() on ↵Shmulik Ladkani
different skbs Currently, test_skb_segment() builds a single test skb and runs skb_segment() on it. Extend test_skb_segment() so it processes an array of numerous skb/feature pairs to test. Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20191025134223.2761-2-shmulik.ladkani@gmail.com
2019-08-20test_bpf: Fix a new clang warning about xor-ing two numbersNathan Chancellor
r369217 in clang added a new warning about potential misuse of the xor operator as an exponentiation operator: ../lib/test_bpf.c:870:13: warning: result of '10 ^ 300' is 294; did you mean '1e300'? [-Wxor-used-as-pow] { { 4, 10 ^ 300 }, { 20, 10 ^ 300 } }, ~~~^~~~~ 1e300 ../lib/test_bpf.c:870:13: note: replace expression with '0xA ^ 300' to silence this warning ../lib/test_bpf.c:870:31: warning: result of '10 ^ 300' is 294; did you mean '1e300'? [-Wxor-used-as-pow] { { 4, 10 ^ 300 }, { 20, 10 ^ 300 } }, ~~~^~~~~ 1e300 ../lib/test_bpf.c:870:31: note: replace expression with '0xA ^ 300' to silence this warning The commit link for this new warning has some good logic behind wanting to add it but this instance appears to be a false positive. Adopt its suggestion to silence the warning but not change the code. According to the differential review link in the clang commit, GCC may eventually adopt this warning as well. Link: https://github.com/ClangBuiltLinux/linux/issues/643 Link: https://github.com/llvm/llvm-project/commit/920890e26812f808a74c60ebc14cc636dac661c1 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-06-05treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295Thomas Gleixner
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of version 2 of the gnu general public license as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 64 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.894819585@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-02-25bpf: test_bpf: turn off preemption in function __run_onceAnders Roxell
When running BPF test suite the following splat occurs: [ 415.930950] test_bpf: #0 TAX jited:0 [ 415.931067] BUG: assuming atomic context at lib/test_bpf.c:6674 [ 415.946169] in_atomic(): 0, irqs_disabled(): 0, pid: 11556, name: modprobe [ 415.953176] INFO: lockdep is turned off. [ 415.957207] CPU: 1 PID: 11556 Comm: modprobe Tainted: G W 5.0.0-rc7-next-20190220 #1 [ 415.966328] Hardware name: HiKey Development Board (DT) [ 415.971592] Call trace: [ 415.974069] dump_backtrace+0x0/0x160 [ 415.977761] show_stack+0x24/0x30 [ 415.981104] dump_stack+0xc8/0x114 [ 415.984534] __cant_sleep+0xf0/0x108 [ 415.988145] test_bpf_init+0x5e0/0x1000 [test_bpf] [ 415.992971] do_one_initcall+0x90/0x428 [ 415.996837] do_init_module+0x60/0x1e4 [ 416.000614] load_module+0x1de0/0x1f50 [ 416.004391] __se_sys_finit_module+0xc8/0xe0 [ 416.008691] __arm64_sys_finit_module+0x24/0x30 [ 416.013255] el0_svc_common+0x78/0x130 [ 416.017031] el0_svc_handler+0x38/0x78 [ 416.020806] el0_svc+0x8/0xc Rework so that preemption is disabled when we loop over function 'BPF_PROG_RUN(...)'. Fixes: 568f196756ad ("bpf: check that BPF programs run with preemption disabled") Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Anders Roxell <anders.roxell@linaro.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-11-16net: remove VLAN_TAG_PRESENTMichał Mirosław
Replace VLAN_TAG_PRESENT with single bit flag and free up VLAN.CFI overload. Now VLAN.CFI is visible in networking stack and can be passed around intact. Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-09-27bpf: test_bpf: add init_net to dev for flow_dissectorSong Liu
Latest changes in __skb_flow_dissect() assume skb->dev has valid nd_net. However, this is not true for test_bpf. As a result, test_bpf.ko crashes the system with the following stack trace: [ 1133.716622] BUG: unable to handle kernel paging request at 0000000000001030 [ 1133.716623] PGD 8000001fbf7ee067 [ 1133.716624] P4D 8000001fbf7ee067 [ 1133.716624] PUD 1f6c1cf067 [ 1133.716625] PMD 0 [ 1133.716628] Oops: 0000 [#1] SMP PTI [ 1133.716630] CPU: 7 PID: 40473 Comm: modprobe Kdump: loaded Not tainted 4.19.0-rc5-00805-gca11cc92ccd2 #1167 [ 1133.716631] Hardware name: Wiwynn Leopard-Orv2/Leopard-DDR BW, BIOS LBM12.5 12/06/2017 [ 1133.716638] RIP: 0010:__skb_flow_dissect+0x83/0x1680 [ 1133.716639] Code: 04 00 00 41 0f b7 44 24 04 48 85 db 4d 8d 14 07 0f 84 01 02 00 00 48 8b 43 10 48 85 c0 0f 84 e5 01 00 00 48 8b 80 a8 04 00 00 <48> 8b 90 30 10 00 00 48 85 d2 0f 84 dd 01 00 00 31 c0 b9 05 00 00 [ 1133.716640] RSP: 0018:ffffc900303c7a80 EFLAGS: 00010282 [ 1133.716642] RAX: 0000000000000000 RBX: ffff881fea0b7400 RCX: 0000000000000000 [ 1133.716643] RDX: ffffc900303c7bb4 RSI: ffffffff8235c3e0 RDI: ffff881fea0b7400 [ 1133.716643] RBP: ffffc900303c7b80 R08: 0000000000000000 R09: 000000000000000e [ 1133.716644] R10: ffffc900303c7bb4 R11: ffff881fb6840400 R12: ffffffff8235c3e0 [ 1133.716645] R13: 0000000000000008 R14: 000000000000001e R15: ffffc900303c7bb4 [ 1133.716646] FS: 00007f54e75d3740(0000) GS:ffff881fff5c0000(0000) knlGS:0000000000000000 [ 1133.716648] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1133.716649] CR2: 0000000000001030 CR3: 0000001f6c226005 CR4: 00000000003606e0 [ 1133.716649] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1133.716650] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1133.716651] Call Trace: [ 1133.716660] ? sched_clock_cpu+0xc/0xa0 [ 1133.716662] ? sched_clock_cpu+0xc/0xa0 [ 1133.716665] ? log_store+0x1b5/0x260 [ 1133.716667] ? up+0x12/0x60 [ 1133.716669] ? skb_get_poff+0x4b/0xa0 [ 1133.716674] ? __kmalloc_reserve.isra.47+0x2e/0x80 [ 1133.716675] skb_get_poff+0x4b/0xa0 [ 1133.716680] bpf_skb_get_pay_offset+0xa/0x10 [ 1133.716686] ? test_bpf_init+0x578/0x1000 [test_bpf] [ 1133.716690] ? netlink_broadcast_filtered+0x153/0x3d0 [ 1133.716695] ? free_pcppages_bulk+0x324/0x600 [ 1133.716696] ? 0xffffffffa0279000 [ 1133.716699] ? do_one_initcall+0x46/0x1bd [ 1133.716704] ? kmem_cache_alloc_trace+0x144/0x1a0 [ 1133.716709] ? do_init_module+0x5b/0x209 [ 1133.716712] ? load_module+0x2136/0x25d0 [ 1133.716715] ? __do_sys_finit_module+0xba/0xe0 [ 1133.716717] ? __do_sys_finit_module+0xba/0xe0 [ 1133.716719] ? do_syscall_64+0x48/0x100 [ 1133.716724] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 This patch fixes tes_bpf by using init_net in the dummy dev. Fixes: d58e468b1112 ("flow_dissector: implements flow dissector BPF hook") Reported-by: Eric Dumazet <edumazet@google.com> Cc: Willem de Bruijn <willemb@google.com> Cc: Petar Penkov <ppenkov@google.com> Signed-off-by: Song Liu <songliubraving@fb.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-06-28test_bpf: flag tests that cannot be jited on s390Kleber Sacilotto de Souza
Flag with FLAG_EXPECTED_FAIL the BPF_MAXINSNS tests that cannot be jited on s390 because they exceed BPF_SIZE_MAX and fail when CONFIG_BPF_JIT_ALWAYS_ON is set. Also set .expected_errcode to -ENOTSUPP so the tests pass in that case. Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-06-03bpf: add also cbpf long jump test cases with heavy expansionDaniel Borkmann
We have one triggering on eBPF but lets also add a cBPF example to make sure we keep tracking them. Also add anther cBPF test running max number of MSH ops. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-05-03bpf: migrate ebpf ld_abs/ld_ind tests to test_verifierDaniel Borkmann
Remove all eBPF tests involving LD_ABS/LD_IND from test_bpf.ko. Reason is that the eBPF tests from test_bpf module do not go via BPF verifier and therefore any instruction rewrites from verifier cannot take place. Therefore, move them into test_verifier which runs out of user space, so that verfier can rewrite LD_ABS/LD_IND internally in upcoming patches. It will have the same effect since runtime tests are also performed from there. This also allows to finally unexport bpf_skb_vlan_{push,pop}_proto and keep it internal to core kernel. Additionally, also add further cBPF LD_ABS/LD_IND test coverage into test_bpf.ko suite. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-03-29test_bpf: Fix NULL vs IS_ERR() check in test_skb_segment()Dan Carpenter
The skb_segment() function returns error pointers on error. It never returns NULL. Fixes: 76db8087c4c9 ("net: bpf: add a test for skb_segment in test_bpf module") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Yonghong Song <yhs@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-25net: bpf: add a test for skb_segment in test_bpf moduleYonghong Song
Without the previous commit, "modprobe test_bpf" will have the following errors: ... [ 98.149165] ------------[ cut here ]------------ [ 98.159362] kernel BUG at net/core/skbuff.c:3667! [ 98.169756] invalid opcode: 0000 [#1] SMP PTI [ 98.179370] Modules linked in: [ 98.179371] test_bpf(+) ... which triggers the bug the previous commit intends to fix. The skbs are constructed to mimic what mlx5 may generate. The packet size/header may not mimic real cases in production. But the processing flow is similar. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-20test_bpf: Fix testing with CONFIG_BPF_JIT_ALWAYS_ON=y on other archesThadeu Lima de Souza Cascardo
Function bpf_fill_maxinsns11 is designed to not be able to be JITed on x86_64. So, it fails when CONFIG_BPF_JIT_ALWAYS_ON=y, and commit 09584b406742 ("bpf: fix selftests/bpf test_kmod.sh failure when CONFIG_BPF_JIT_ALWAYS_ON=y") makes sure that failure is detected on that case. However, it does not fail on other architectures, which have a different JIT compiler design. So, test_bpf has started to fail to load on those. After this fix, test_bpf loads fine on both x86_64 and ppc64el. Fixes: 09584b406742 ("bpf: fix selftests/bpf test_kmod.sh failure when CONFIG_BPF_JIT_ALWAYS_ON=y") Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Reviewed-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-02-28test_bpf: reduce MAX_TESTRUNSEric Dumazet
For tests that are using the maximal number of BPF instruction, each run takes 20 usec. Looping 10,000 times on them totals 200 ms, which is bad when the loop is not preemptible. test_bpf: #264 BPF_MAXINSNS: Call heavy transformations jited:1 19248 18548 PASS test_bpf: #269 BPF_MAXINSNS: ld_abs+get_processor_id jited:1 20896 PASS Lets divide by ten the number of iterations, so that max latency is 20ms. We could use need_resched() to break the loop earlier if we believe 20 ms is too much. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-02-26test_bpf: add a schedule pointEric Dumazet
test_bpf() is taking 1.6 seconds nowadays, it is time to add a schedule point in it. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-02-05bpf: fix selftests/bpf test_kmod.sh failure when CONFIG_BPF_JIT_ALWAYS_ON=yYonghong Song
With CONFIG_BPF_JIT_ALWAYS_ON is defined in the config file, tools/testing/selftests/bpf/test_kmod.sh failed like below: [root@localhost bpf]# ./test_kmod.sh sysctl: setting key "net.core.bpf_jit_enable": Invalid argument [ JIT enabled:0 hardened:0 ] [ 132.175681] test_bpf: #297 BPF_MAXINSNS: Jump, gap, jump, ... FAIL to prog_create err=-524 len=4096 [ 132.458834] test_bpf: Summary: 348 PASSED, 1 FAILED, [340/340 JIT'ed] [ JIT enabled:1 hardened:0 ] [ 133.456025] test_bpf: #297 BPF_MAXINSNS: Jump, gap, jump, ... FAIL to prog_create err=-524 len=4096 [ 133.730935] test_bpf: Summary: 348 PASSED, 1 FAILED, [340/340 JIT'ed] [ JIT enabled:1 hardened:1 ] [ 134.769730] test_bpf: #297 BPF_MAXINSNS: Jump, gap, jump, ... FAIL to prog_create err=-524 len=4096 [ 135.050864] test_bpf: Summary: 348 PASSED, 1 FAILED, [340/340 JIT'ed] [ JIT enabled:1 hardened:2 ] [ 136.442882] test_bpf: #297 BPF_MAXINSNS: Jump, gap, jump, ... FAIL to prog_create err=-524 len=4096 [ 136.821810] test_bpf: Summary: 348 PASSED, 1 FAILED, [340/340 JIT'ed] [root@localhost bpf]# The test_kmod.sh load/remove test_bpf.ko multiple times with different settings for sysctl net.core.bpf_jit_{enable,harden}. The failed test #297 of test_bpf.ko is designed such that JIT always fails. Commit 290af86629b2 (bpf: introduce BPF_JIT_ALWAYS_ON config) introduced the following tightening logic: ... if (!bpf_prog_is_dev_bound(fp->aux)) { fp = bpf_int_jit_compile(fp); #ifdef CONFIG_BPF_JIT_ALWAYS_ON if (!fp->jited) { *err = -ENOTSUPP; return fp; } #endif ... With this logic, Test #297 always gets return value -ENOTSUPP when CONFIG_BPF_JIT_ALWAYS_ON is defined, causing the test failure. This patch fixed the failure by marking Test #297 as expected failure when CONFIG_BPF_JIT_ALWAYS_ON is defined. Fixes: 290af86629b2 (bpf: introduce BPF_JIT_ALWAYS_ON config) Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-01-26bpf: add further test cases around div/mod and othersDaniel Borkmann
Update selftests to relfect recent changes and add various new test cases. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-01-19bpf: add couple of test cases for signed extended immsDaniel Borkmann
Add a couple of test cases for interpreter and JIT that are related to an issue we faced some time ago in Cilium [1], which is fixed in LLVM with commit e53750e1e086 ("bpf: fix bug on silently truncating 64-bit immediate"). Test cases were run-time checking kernel to behave as intended which should also provide some guidance for current or new JITs in case they should trip over this. Added for cBPF and eBPF. [1] https://github.com/cilium/cilium/pull/2162 Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-01-09bpf: introduce BPF_JIT_ALWAYS_ON configAlexei Starovoitov
The BPF interpreter has been used as part of the spectre 2 attack CVE-2017-5715. A quote from goolge project zero blog: "At this point, it would normally be necessary to locate gadgets in the host kernel code that can be used to actually leak data by reading from an attacker-controlled location, shifting and masking the result appropriately and then using the result of that as offset to an attacker-controlled address for a load. But piecing gadgets together and figuring out which ones work in a speculation context seems annoying. So instead, we decided to use the eBPF interpreter, which is built into the host kernel - while there is no legitimate way to invoke it from inside a VM, the presence of the code in the host kernel's text section is sufficient to make it usable for the attack, just like with ordinary ROP gadgets." To make attacker job harder introduce BPF_JIT_ALWAYS_ON config option that removes interpreter from the kernel in favor of JIT-only mode. So far eBPF JIT is supported by: x64, arm64, arm32, sparc64, s390, powerpc64, mips64 The start of JITed program is randomized and code page is marked as read-only. In addition "constant blinding" can be turned on with net.core.bpf_jit_harden v2->v3: - move __bpf_prog_ret0 under ifdef (Daniel) v1->v2: - fix init order, test_bpf and cBPF (Daniel's feedback) - fix offloaded bpf (Jakub's feedback) - add 'return 0' dummy in case something can invoke prog->bpf_func - retarget bpf tree. For bpf-next the patch would need one extra hunk. It will be sent when the trees are merged back to net-next Considered doing: int bpf_jit_enable __read_mostly = BPF_EBPF_JIT_DEFAULT; but it seems better to land the patch as-is and in bpf-next remove bpf_jit_enable global variable from all JITs, consolidate in one place and remove this jit_init() function. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2017-12-15bpf: add test case for ld_abs and helper changing pkt dataDaniel Borkmann
Add a test that i) uses LD_ABS, ii) zeroing R6 before call, iii) calls a helper that triggers reload of cached skb data, iv) uses LD_ABS again. It's added for test_bpf in order to do runtime testing after JITing as well as test_verifier to test that the sequence is allowed. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2017-08-09bpf: add BPF_J{LT,LE,SLT,SLE} instructionsDaniel Borkmann
Currently, eBPF only understands BPF_JGT (>), BPF_JGE (>=), BPF_JSGT (s>), BPF_JSGE (s>=) instructions, this means that particularly *JLT/*JLE counterparts involving immediates need to be rewritten from e.g. X < [IMM] by swapping arguments into [IMM] > X, meaning the immediate first is required to be loaded into a register Y := [IMM], such that then we can compare with Y > X. Note that the destination operand is always required to be a register. This has the downside of having unnecessarily increased register pressure, meaning complex program would need to spill other registers temporarily to stack in order to obtain an unused register for the [IMM]. Loading to registers will thus also affect state pruning since we need to account for that register use and potentially those registers that had to be spilled/filled again. As a consequence slightly more stack space might have been used due to spilling, and BPF programs are a bit longer due to extra code involving the register load and potentially required spill/fills. Thus, add BPF_JLT (<), BPF_JLE (<=), BPF_JSLT (s<), BPF_JSLE (s<=) counterparts to the eBPF instruction set. Modifying LLVM to remove the NegateCC() workaround in a PoC patch at [1] and allowing it to also emit the new instructions resulted in cilium's BPF programs that are injected into the fast-path to have a reduced program length in the range of 2-3% (e.g. accumulated main and tail call sections from one of the object file reduced from 4864 to 4729 insns), reduced complexity in the range of 10-30% (e.g. accumulated sections reduced in one of the cases from 116432 to 88428 insns), and reduced stack usage in the range of 1-5% (e.g. accumulated sections from one of the object files reduced from 824 to 784b). The modification for LLVM will be incorporated in a backwards compatible way. Plan is for LLVM to have i) a target specific option to offer a possibility to explicitly enable the extension by the user (as we have with -m target specific extensions today for various CPU insns), and ii) have the kernel checked for presence of the extensions and enable them transparently when the user is selecting more aggressive options such as -march=native in a bpf target context. (Other frontends generating BPF byte code, e.g. ply can probe the kernel directly for its code generation.) [1] https://github.com/borkmann/llvm/tree/bpf-insns Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-20net: introduce __skb_put_[zero, data, u8]yuan linyu
follow Johannes Berg, semantic patch file as below, @@ identifier p, p2; expression len; expression skb; type t, t2; @@ ( -p = __skb_put(skb, len); +p = __skb_put_zero(skb, len); | -p = (t)__skb_put(skb, len); +p = __skb_put_zero(skb, len); ) ... when != p ( p2 = (t2)p; -memset(p2, 0, len); | -memset(p, 0, len); ) @@ identifier p; expression len; expression skb; type t; @@ ( -t p = __skb_put(skb, len); +t p = __skb_put_zero(skb, len); ) ... when != p ( -memset(p, 0, len); ) @@ type t, t2; identifier p, p2; expression skb; @@ t *p; ... ( -p = __skb_put(skb, sizeof(t)); +p = __skb_put_zero(skb, sizeof(t)); | -p = (t *)__skb_put(skb, sizeof(t)); +p = __skb_put_zero(skb, sizeof(t)); ) ... when != p ( p2 = (t2)p; -memset(p2, 0, sizeof(*p)); | -memset(p, 0, sizeof(*p)); ) @@ expression skb, len; @@ -memset(__skb_put(skb, len), 0, len); +__skb_put_zero(skb, len); @@ expression skb, len, data; @@ -memcpy(__skb_put(skb, len), data, len); +__skb_put_data(skb, data, len); @@ expression SKB, C, S; typedef u8; identifier fn = {__skb_put}; fresh identifier fn2 = fn ## "_u8"; @@ - *(u8 *)fn(SKB, S) = C; + fn2(SKB, C); Signed-off-by: yuan linyu <Linyu.Yuan@alcatel-sbell.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-14test_bpf: Add test to make conditional jump cross a large number of insns.David Daney
On MIPS, conditional branches can only span 32k instructions. To exceed this limit in the JIT with the BPF maximum of 4k insns, we need to choose eBPF insns that expand to more than 8 machine instructions. Use BPF_LD_ABS as it is quite complex. This forces the JIT to invert the sense of the branch to branch around a long jump to the end. This (somewhat) verifies that the branch inversion logic and target address calculation of the long jumps are done correctly. Signed-off-by: David Daney <david.daney@cavium.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-31bpf: fix stack_depth usage by test_bpf.koAlexei Starovoitov
test_bpf.ko doesn't call verifier before selecting interpreter or JITing, hence the tests need to manually specify the amount of stack they consume. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-25test_bpf: Add a couple of tests for BPF_JSGE.David Daney
Some JITs can optimize comparisons with zero. Add a couple of BPF_JSGE tests against immediate zero. Signed-off-by: David Daney <david.daney@cavium.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-03test_bpf: Use ULL suffix for 64-bit constantsGeert Uytterhoeven
On 32-bit: lib/test_bpf.c:4772: warning: integer constant is too large for ‘unsigned long’ type lib/test_bpf.c:4772: warning: integer constant is too large for ‘unsigned long’ type lib/test_bpf.c:4773: warning: integer constant is too large for ‘unsigned long’ type lib/test_bpf.c:4773: warning: integer constant is too large for ‘unsigned long’ type lib/test_bpf.c:4787: warning: integer constant is too large for ‘unsigned long’ type lib/test_bpf.c:4787: warning: integer constant is too large for ‘unsigned long’ type lib/test_bpf.c:4801: warning: integer constant is too large for ‘unsigned long’ type lib/test_bpf.c:4801: warning: integer constant is too large for ‘unsigned long’ type lib/test_bpf.c:4802: warning: integer constant is too large for ‘unsigned long’ type lib/test_bpf.c:4802: warning: integer constant is too large for ‘unsigned long’ type On 32-bit systems, "long" is only 32-bit. Replace the "UL" suffix by "ULL" to fix this. Fixes: 85f68fe898320575 ("bpf, arm64: implement jiting of BPF_XADD") Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-05-02bpf, arm64: fix jit branch offset related to ldimm64Daniel Borkmann
When the instruction right before the branch destination is a 64 bit load immediate, we currently calculate the wrong jump offset in the ctx->offset[] array as we only account one instruction slot for the 64 bit load immediate although it uses two BPF instructions. Fix it up by setting the offset into the right slot after we incremented the index. Before (ldimm64 test 1): [...] 00000020: 52800007 mov w7, #0x0 // #0 00000024: d2800060 mov x0, #0x3 // #3 00000028: d2800041 mov x1, #0x2 // #2 0000002c: eb01001f cmp x0, x1 00000030: 54ffff82 b.cs 0x00000020 00000034: d29fffe7 mov x7, #0xffff // #65535 00000038: f2bfffe7 movk x7, #0xffff, lsl #16 0000003c: f2dfffe7 movk x7, #0xffff, lsl #32 00000040: f2ffffe7 movk x7, #0xffff, lsl #48 00000044: d29dddc7 mov x7, #0xeeee // #61166 00000048: f2bdddc7 movk x7, #0xeeee, lsl #16 0000004c: f2ddddc7 movk x7, #0xeeee, lsl #32 00000050: f2fdddc7 movk x7, #0xeeee, lsl #48 [...] After (ldimm64 test 1): [...] 00000020: 52800007 mov w7, #0x0 // #0 00000024: d2800060 mov x0, #0x3 // #3 00000028: d2800041 mov x1, #0x2 // #2 0000002c: eb01001f cmp x0, x1 00000030: 540000a2 b.cs 0x00000044 00000034: d29fffe7 mov x7, #0xffff // #65535 00000038: f2bfffe7 movk x7, #0xffff, lsl #16 0000003c: f2dfffe7 movk x7, #0xffff, lsl #32 00000040: f2ffffe7 movk x7, #0xffff, lsl #48 00000044: d29dddc7 mov x7, #0xeeee // #61166 00000048: f2bdddc7 movk x7, #0xeeee, lsl #16 0000004c: f2ddddc7 movk x7, #0xeeee, lsl #32 00000050: f2fdddc7 movk x7, #0xeeee, lsl #48 [...] Also, add a couple of test cases to make sure JITs pass this test. Tested on Cavium ThunderX ARMv8. The added test cases all pass after the fix. Fixes: 8eee539ddea0 ("arm64: bpf: fix out-of-bounds read in bpf2a64_offset()") Reported-by: David S. Miller <davem@davemloft.net> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Cc: Xi Wang <xi.wang@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-30 16:06:21 +0000