From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Jiri Olsa <jolsa@kernel.org>
Cc: "Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andriin@fb.com>,
"Network Development" <netdev@vger.kernel.org>,
bpf <bpf@vger.kernel.org>, "Martin KaFai Lau" <kafai@fb.com>,
"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@chromium.org>,
"Toke Høiland-Jørgensen" <toke@redhat.com>,
"Julia Lawall" <julia.lawall@inria.fr>
Subject: Re: [PATCHv5 bpf-next 0/7] bpf: Tracing and lsm programs re-attach
Date: Thu, 15 Apr 2021 16:45:24 -0700 [thread overview]
Message-ID: <CAADnVQK9+Rj8CCC0JZaQaovWqeJKWoAQihOU3eMjf94mk9e+xA@mail.gmail.com> (raw)
In-Reply-To: <20210414195147.1624932-1-jolsa@kernel.org>
On Wed, Apr 14, 2021 at 12:52 PM Jiri Olsa <jolsa@kernel.org> wrote:
>
> hi,
> while adding test for pinning the module while there's
> trampoline attach to it, I noticed that we don't allow
> link detach and following re-attach for trampolines.
> Adding that for tracing and lsm programs.
>
> You need to have patch [1] from bpf tree for test module
> attach test to pass.
>
> v5 changes:
> - fixed missing hlist_del_init change
> - fixed several ASSERT calls
> - added extra patch for missing ';'
> - added ASSERT macros to lsm test
> - added acks
It doesn't work:
[ 52.763254] ------------[ cut here ]------------
[ 52.763767] WARNING: CPU: 2 PID: 1967 at kernel/bpf/syscall.c:2518
bpf_tracing_link_release+0x34/0x40
[ 52.764666] Modules linked in: bpf_preload [last unloaded: bpf_testmod]
[ 52.765310] CPU: 2 PID: 1967 Comm: test_progs Tainted: G
O 5.12.0-rc4-01652-gf03a9b92b5f3 #3293
[ 52.766279] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.11.0-2.el7 04/01/2014
[ 52.767128] RIP: 0010:bpf_tracing_link_release+0x34/0x40
[ 52.767653] Code: 8b 77 48 48 8b 7f 18 e8 ea 67 02 00 85 c0 75 1a
48 8b 7b 48 e8 ad 60 02 00 48 8b 7b 50 48 85 ff 74 06 5b e9 6e ff ff
ff 5b c3 <0f> 0b eb e2 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89
fd 8b
[ 52.769444] RSP: 0018:ffffc900001bfe98 EFLAGS: 00010286
[ 52.769957] RAX: 00000000ffffffed RBX: ffff88810218e420 RCX: 0000000000000000
[ 52.770642] RDX: ffff888105e89f80 RSI: ffffffff8118e539 RDI: ffff88811cafec10
[ 52.771338] RBP: ffff88810218e420 R08: 0000000000000270 R09: 00000000000003cb
[ 52.772041] R10: ffff8881002a1090 R11: ffff888237d2aaf0 R12: ffff888101951030
[ 52.772729] R13: ffff888100226f20 R14: ffff88810629f180 R15: ffff888105e89f80
[ 52.773419] FS: 00007f82c7b93700(0000) GS:ffff888237d00000(0000)
knlGS:0000000000000000
[ 52.774213] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 52.774784] CR2: 00007f82c7ba1000 CR3: 0000000105cfc006 CR4: 00000000003706e0
[ 52.775494] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 52.776199] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 52.776887] Call Trace:
[ 52.777143] bpf_link_free+0x25/0x40
[ 52.777525] bpf_link_release+0x11/0x20
[ 52.777924] __fput+0x9f/0x240
[ 52.778234] task_work_run+0x63/0xb0
[ 52.778588] exit_to_user_mode_prepare+0x132/0x140
[ 52.779064] syscall_exit_to_user_mode+0x1d/0x40
[ 52.779519] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 52.780026] RIP: 0033:0x7f82c6f3815d
[ 52.780384] Code: c2 20 00 00 75 10 b8 03 00 00 00 0f 05 48 3d 01
f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24 b8 03 00 00
00 0f 05 <48> 8b 3c 24 48 89 c2 e8 37 fc ff ff 48 89 d0 48 83 c4 08 48
3d 01
test_module_attach:FAIL:delete_module unexpected success: 0
libbpf: prog 'handle_fexit': failed to attach: No such file or directory
test_module_attach:FAIL:attach_fexit unexpected error: -2
#68 module_attach:FAIL
and another in:
./test_progs -t module
[ 156.660834] ------------[ cut here ]------------
[ 156.661414] WARNING: CPU: 3 PID: 2511 at kernel/trace/ftrace.c:6321
ftrace_module_enable+0x33a/0x370
[ 156.662445] Modules linked in: bpf_testmod(O+) bpf_preload [last
unloaded: bpf_testmod]
[ 156.663325] CPU: 3 PID: 2511 Comm: test_progs Tainted: G W
O 5.12.0-rc4-01652-gf03a9b92b5f3 #3293
[ 156.664369] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.11.0-2.el7 04/01/2014
[ 156.665265] RIP: 0010:ftrace_module_enable+0x33a/0x370
[ 156.665890] Code: 00 00 74 9d 48 0d 00 00 00 10 48 89 45 08 e9 db
fe ff ff 8b 8b 98 01 00 00 48 01 ca 48 39 d0 0f 83 2c fd ff ff e9 66
fd ff ff <0f> 0b e9 bd fe ff ff 0f 0b e9 b6 fe ff ff 48 83 78 10 00 0f
85 dd
[ 156.667822] RSP: 0018:ffffc900001c7d50 EFLAGS: 00010206
[ 156.668354] RAX: 0000000000000000 RBX: ffffffffa001c380 RCX: 0000000000005000
[ 156.669079] RDX: 0000000000031045 RSI: ffffffffa0019080 RDI: 0000000000000000
[ 156.669793] RBP: ffff888104bd9020 R08: ffffffff83174f00 R09: 0000000000000000
[ 156.670529] R10: 0000000000000001 R11: ffffffffa0019080 R12: ffff88810092e480
[ 156.671368] R13: 61c8864680b583eb R14: 0000000000000002 R15: 0000000000000000
[ 156.672135] FS: 00007f198becc700(0000) GS:ffff888237d80000(0000)
knlGS:0000000000000000
[ 156.672973] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 156.673625] CR2: 00000000006a14f0 CR3: 00000001169be003 CR4: 00000000003706e0
[ 156.674411] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 156.675209] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 156.675959] Call Trace:
[ 156.676209] load_module+0x1f71/0x27d0
[ 156.676623] ? __do_sys_finit_module+0x8f/0xc0
[ 156.677084] __do_sys_finit_module+0x8f/0xc0
[ 156.677525] do_syscall_64+0x2d/0x40
[ 156.677932] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 156.678465] RIP: 0033:0x7f198afa37f9
[ 156.678837] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40
00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24
08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 57 76 2b 00 f7 d8 64 89
01 48
[ 156.680812] RSP: 002b:00007ffc428756d8 EFLAGS: 00000202 ORIG_RAX:
0000000000000139
[ 156.681614] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f198afa37f9
[ 156.682344] RDX: 0000000000000000 RSI: 00000000006a14f7 RDI: 0000000000000004
[ 156.683111] RBP: 00007ffc428758b8 R08: 00007f198becc700 R09: 00007ffc428758b8
[ 156.683842] R10: 00007f198becc700 R11: 0000000000000202 R12: 000000000040bce0
[ 156.684590] R13: 00007ffc428758b0 R14: 0000000000000000 R15: 0000000000000000
[ 156.685335] ---[ end trace 7086b04742183c35 ]---
#58 ksyms_module:OK
next prev parent reply other threads:[~2021-04-15 23:45 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-14 19:51 [PATCHv5 bpf-next 0/7] bpf: Tracing and lsm programs re-attach Jiri Olsa
2021-04-14 19:51 ` [PATCHv5 bpf-next 1/7] bpf: Allow trampoline re-attach for tracing and lsm programs Jiri Olsa
2021-04-15 23:22 ` Andrii Nakryiko
2021-04-19 22:47 ` KP Singh
2021-04-14 19:51 ` [PATCHv5 bpf-next 2/7] selftests/bpf: Add missing semicolon Jiri Olsa
2021-04-15 23:23 ` Andrii Nakryiko
2021-04-14 19:51 ` [PATCHv5 bpf-next 3/7] selftests/bpf: Add re-attach test to fentry_test Jiri Olsa
2021-04-14 19:51 ` [PATCHv5 bpf-next 4/7] selftests/bpf: Add re-attach test to fexit_test Jiri Olsa
2021-04-14 19:51 ` [PATCHv5 bpf-next 5/7] selftests/bpf: Add re-attach test to lsm test Jiri Olsa
2021-04-14 19:51 ` [PATCHv5 bpf-next 6/7] selftests/bpf: Test that module can't be unloaded with attached trampoline Jiri Olsa
2021-04-14 19:51 ` [PATCHv5 bpf-next 7/7] selftests/bpf: Use ASSERT macros in lsm test Jiri Olsa
2021-04-15 23:24 ` Andrii Nakryiko
2021-04-15 23:45 ` Alexei Starovoitov [this message]
2021-04-16 6:55 ` [PATCHv5 bpf-next 0/7] bpf: Tracing and lsm programs re-attach Jiri Olsa
2021-04-26 4:14 ` Alexei Starovoitov
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