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bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE #274

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bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE #274

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Pull request for series with
subject: bpf: don't rely on GCC attribute((optimize)) to disable GCSE
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=371807

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Master branch: 343a3e8
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=371807
version: 1

kernel-patches-bot and others added 2 commits October 27, 2020 14:50
@kernel-patches-bot
adding ci files
a63dbed
@ardbiesheuvel @kernel-patches-bot
bpf: don't rely on GCC __attribute__((optimize)) to disable GCSE
963f138 
Commit 3193c08 ("bpf: Disable GCC -fgcse optimization for
___bpf_prog_run()") introduced a __no_fgcse macro that expands to a
function scope __attribute__((optimize("-fno-gcse"))), to disable a
GCC specific optimization that was causing trouble on x86 builds, and
was not expected to have any positive effect in the first place.

However, as the GCC manual documents, __attribute__((optimize))
is not for production use, and results in all other optimization
options to be forgotten for the function in question. This can
cause all kinds of trouble, but in one particular reported case,
it causes -fno-asynchronous-unwind-tables to be disregarded,
resulting in .eh_frame info to be emitted for the function
inadvertently.

This reverts commit 3193c08, and instead, it disables the -fgcse
optimization for the entire source file, but only when building for
X86.

Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Arvind Sankar <nivedita@alum.mit.edu>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Kees Cook <keescook@chromium.org>
Fixes: 3193c08 ("bpf: Disable GCC -fgcse optimization for ___bpf_prog_run()")
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
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Master branch: c66dca9
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=371807
version: 1

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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=371807 irrelevant now. Closing PR.

@kernel-patches-bot kernel-patches-bot deleted the series/371807=>bpf branch November 2, 2020 18:13
kernel-patches-bot pushed a commit that referenced this pull request Aug 11, 2021
@fomichev
selftests/bpf: verify bpf_get_netns_cookie in BPF_PROG_TYPE_CGROUP_SO…
317eb56 
…CKOPT

Add verifier ctx test to call bpf_get_netns_cookie from
cgroup/setsockopt.

  #269/p pass ctx or null check, 1: ctx Did not run the program (not supported) OK
  #270/p pass ctx or null check, 2: null Did not run the program (not supported) OK
  #271/p pass ctx or null check, 3: 1 OK
  #272/p pass ctx or null check, 4: ctx - const OK
  #273/p pass ctx or null check, 5: null (connect) Did not run the program (not supported) OK
  #274/p pass ctx or null check, 6: null (bind) Did not run the program (not supported) OK
  #275/p pass ctx or null check, 7: ctx (bind) Did not run the program (not supported) OK
  #276/p pass ctx or null check, 8: null (bind) OK
  #277/p pass ctx or null check, 9: ctx (cgroup/setsockopt) Did not run the program (not supported) OK
  #278/p pass ctx or null check, 10: null (cgroup/setsockopt) Did not run the program (not supported) OK

Signed-off-by: Stanislav Fomichev <sdf@google.com>
kernel-patches-bot pushed a commit that referenced this pull request Aug 12, 2021
@fomichev
selftests/bpf: verify bpf_get_netns_cookie in BPF_PROG_TYPE_CGROUP_SO…
35e81d8 
…CKOPT

Add verifier ctx test to call bpf_get_netns_cookie from
cgroup/setsockopt.

  #269/p pass ctx or null check, 1: ctx Did not run the program (not supported) OK
  #270/p pass ctx or null check, 2: null Did not run the program (not supported) OK
  #271/p pass ctx or null check, 3: 1 OK
  #272/p pass ctx or null check, 4: ctx - const OK
  #273/p pass ctx or null check, 5: null (connect) Did not run the program (not supported) OK
  #274/p pass ctx or null check, 6: null (bind) Did not run the program (not supported) OK
  #275/p pass ctx or null check, 7: ctx (bind) Did not run the program (not supported) OK
  #276/p pass ctx or null check, 8: null (bind) OK
  #277/p pass ctx or null check, 9: ctx (cgroup/setsockopt) Did not run the program (not supported) OK
  #278/p pass ctx or null check, 10: null (cgroup/setsockopt) Did not run the program (not supported) OK

Signed-off-by: Stanislav Fomichev <sdf@google.com>
kernel-patches-bot pushed a commit that referenced this pull request Aug 12, 2021
@fomichev
selftests/bpf: verify bpf_get_netns_cookie in BPF_PROG_TYPE_CGROUP_SO…
e819449 
…CKOPT

Add verifier ctx test to call bpf_get_netns_cookie from
cgroup/setsockopt.

  #269/p pass ctx or null check, 1: ctx Did not run the program (not supported) OK
  #270/p pass ctx or null check, 2: null Did not run the program (not supported) OK
  #271/p pass ctx or null check, 3: 1 OK
  #272/p pass ctx or null check, 4: ctx - const OK
  #273/p pass ctx or null check, 5: null (connect) Did not run the program (not supported) OK
  #274/p pass ctx or null check, 6: null (bind) Did not run the program (not supported) OK
  #275/p pass ctx or null check, 7: ctx (bind) Did not run the program (not supported) OK
  #276/p pass ctx or null check, 8: null (bind) OK
  #277/p pass ctx or null check, 9: ctx (cgroup/setsockopt) Did not run the program (not supported) OK
  #278/p pass ctx or null check, 10: null (cgroup/setsockopt) Did not run the program (not supported) OK

Signed-off-by: Stanislav Fomichev <sdf@google.com>
kernel-patches-bot pushed a commit that referenced this pull request Aug 13, 2021
@fomichev
selftests/bpf: verify bpf_get_netns_cookie in BPF_PROG_TYPE_CGROUP_SO…
e64d437 
…CKOPT

Add verifier ctx test to call bpf_get_netns_cookie from
cgroup/setsockopt.

  #269/p pass ctx or null check, 1: ctx Did not run the program (not supported) OK
  #270/p pass ctx or null check, 2: null Did not run the program (not supported) OK
  #271/p pass ctx or null check, 3: 1 OK
  #272/p pass ctx or null check, 4: ctx - const OK
  #273/p pass ctx or null check, 5: null (connect) Did not run the program (not supported) OK
  #274/p pass ctx or null check, 6: null (bind) Did not run the program (not supported) OK
  #275/p pass ctx or null check, 7: ctx (bind) Did not run the program (not supported) OK
  #276/p pass ctx or null check, 8: null (bind) OK
  #277/p pass ctx or null check, 9: ctx (cgroup/setsockopt) Did not run the program (not supported) OK
  #278/p pass ctx or null check, 10: null (cgroup/setsockopt) Did not run the program (not supported) OK

Signed-off-by: Stanislav Fomichev <sdf@google.com>
kernel-patches-bot pushed a commit that referenced this pull request Aug 13, 2021
@fomichev
selftests/bpf: verify bpf_get_netns_cookie in BPF_PROG_TYPE_CGROUP_SO…
bc56fcc 
…CKOPT

Add verifier ctx test to call bpf_get_netns_cookie from
cgroup/setsockopt.

  #269/p pass ctx or null check, 1: ctx Did not run the program (not supported) OK
  #270/p pass ctx or null check, 2: null Did not run the program (not supported) OK
  #271/p pass ctx or null check, 3: 1 OK
  #272/p pass ctx or null check, 4: ctx - const OK
  #273/p pass ctx or null check, 5: null (connect) Did not run the program (not supported) OK
  #274/p pass ctx or null check, 6: null (bind) Did not run the program (not supported) OK
  #275/p pass ctx or null check, 7: ctx (bind) Did not run the program (not supported) OK
  #276/p pass ctx or null check, 8: null (bind) OK
  #277/p pass ctx or null check, 9: ctx (cgroup/setsockopt) Did not run the program (not supported) OK
  #278/p pass ctx or null check, 10: null (cgroup/setsockopt) Did not run the program (not supported) OK

Signed-off-by: Stanislav Fomichev <sdf@google.com>
kernel-patches-daemon-bpf bot pushed a commit that referenced this pull request Jun 20, 2024
@borkmann
selftests/bpf: Add more ring buffer test coverage
354c868 
Add test coverage for reservations beyond the ring buffer size in order
to validate that bpf_ringbuf_reserve() rejects the request with NULL, all
other ring buffer tests keep passing as well:

  # ./vmtest.sh -- ./test_progs -t ringbuf
  [...]
  ./test_progs -t ringbuf
  [    1.165434] bpf_testmod: loading out-of-tree module taints kernel.
  [    1.165825] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
  [    1.284001] tsc: Refined TSC clocksource calibration: 3407.982 MHz
  [    1.286871] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fc34e357, max_idle_ns: 440795379773 ns
  [    1.289555] clocksource: Switched to clocksource tsc
  #274/1   ringbuf/ringbuf:OK
  #274/2   ringbuf/ringbuf_n:OK
  #274/3   ringbuf/ringbuf_map_key:OK
  #274/4   ringbuf/ringbuf_write:OK
  #274     ringbuf:OK
  #275     ringbuf_multi:OK
  [...]

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
kernel-patches-daemon-bpf bot pushed a commit that referenced this pull request Jun 21, 2024
@borkmann
selftests/bpf: Add more ring buffer test coverage
b02d191 
Add test coverage for reservations beyond the ring buffer size in order
to validate that bpf_ringbuf_reserve() rejects the request with NULL, all
other ring buffer tests keep passing as well:

  # ./vmtest.sh -- ./test_progs -t ringbuf
  [...]
  ./test_progs -t ringbuf
  [    1.165434] bpf_testmod: loading out-of-tree module taints kernel.
  [    1.165825] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
  [    1.284001] tsc: Refined TSC clocksource calibration: 3407.982 MHz
  [    1.286871] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fc34e357, max_idle_ns: 440795379773 ns
  [    1.289555] clocksource: Switched to clocksource tsc
  #274/1   ringbuf/ringbuf:OK
  #274/2   ringbuf/ringbuf_n:OK
  #274/3   ringbuf/ringbuf_map_key:OK
  #274/4   ringbuf/ringbuf_write:OK
  #274     ringbuf:OK
  #275     ringbuf_multi:OK
  [...]

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
kernel-patches-daemon-bpf bot pushed a commit that referenced this pull request Jun 21, 2024
@borkmann
selftests/bpf: Add more ring buffer test coverage
d6feca8 
Add test coverage for reservations beyond the ring buffer size in order
to validate that bpf_ringbuf_reserve() rejects the request with NULL, all
other ring buffer tests keep passing as well:

  # ./vmtest.sh -- ./test_progs -t ringbuf
  [...]
  ./test_progs -t ringbuf
  [    1.165434] bpf_testmod: loading out-of-tree module taints kernel.
  [    1.165825] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
  [    1.284001] tsc: Refined TSC clocksource calibration: 3407.982 MHz
  [    1.286871] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fc34e357, max_idle_ns: 440795379773 ns
  [    1.289555] clocksource: Switched to clocksource tsc
  #274/1   ringbuf/ringbuf:OK
  #274/2   ringbuf/ringbuf_n:OK
  #274/3   ringbuf/ringbuf_map_key:OK
  #274/4   ringbuf/ringbuf_write:OK
  #274     ringbuf:OK
  #275     ringbuf_multi:OK
  [...]

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
kernel-patches-daemon-bpf bot pushed a commit that referenced this pull request Jun 21, 2024
@borkmann
selftests/bpf: Add more ring buffer test coverage
b515a6d 
Add test coverage for reservations beyond the ring buffer size in order
to validate that bpf_ringbuf_reserve() rejects the request with NULL, all
other ring buffer tests keep passing as well:

  # ./vmtest.sh -- ./test_progs -t ringbuf
  [...]
  ./test_progs -t ringbuf
  [    1.165434] bpf_testmod: loading out-of-tree module taints kernel.
  [    1.165825] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
  [    1.284001] tsc: Refined TSC clocksource calibration: 3407.982 MHz
  [    1.286871] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fc34e357, max_idle_ns: 440795379773 ns
  [    1.289555] clocksource: Switched to clocksource tsc
  #274/1   ringbuf/ringbuf:OK
  #274/2   ringbuf/ringbuf_n:OK
  #274/3   ringbuf/ringbuf_map_key:OK
  #274/4   ringbuf/ringbuf_write:OK
  #274     ringbuf:OK
  #275     ringbuf_multi:OK
  [...]

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
kernel-patches-daemon-bpf bot pushed a commit that referenced this pull request Jun 21, 2024
@borkmann @anakryiko
selftests/bpf: Add more ring buffer test coverage
1d68f68 
Add test coverage for reservations beyond the ring buffer size in order
to validate that bpf_ringbuf_reserve() rejects the request with NULL, all
other ring buffer tests keep passing as well:

  # ./vmtest.sh -- ./test_progs -t ringbuf
  [...]
  ./test_progs -t ringbuf
  [    1.165434] bpf_testmod: loading out-of-tree module taints kernel.
  [    1.165825] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
  [    1.284001] tsc: Refined TSC clocksource calibration: 3407.982 MHz
  [    1.286871] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fc34e357, max_idle_ns: 440795379773 ns
  [    1.289555] clocksource: Switched to clocksource tsc
  #274/1   ringbuf/ringbuf:OK
  #274/2   ringbuf/ringbuf_n:OK
  #274/3   ringbuf/ringbuf_map_key:OK
  #274/4   ringbuf/ringbuf_write:OK
  #274     ringbuf:OK
  #275     ringbuf_multi:OK
  [...]

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240621140828.18238-2-daniel@iogearbox.net
kernel-patches-daemon-bpf bot pushed a commit that referenced this pull request Jun 21, 2024
@borkmann @anakryiko
selftests/bpf: Add more ring buffer test coverage
fece2c4 
Add test coverage for reservations beyond the ring buffer size in order
to validate that bpf_ringbuf_reserve() rejects the request with NULL, all
other ring buffer tests keep passing as well:

  # ./vmtest.sh -- ./test_progs -t ringbuf
  [...]
  ./test_progs -t ringbuf
  [    1.165434] bpf_testmod: loading out-of-tree module taints kernel.
  [    1.165825] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
  [    1.284001] tsc: Refined TSC clocksource calibration: 3407.982 MHz
  [    1.286871] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fc34e357, max_idle_ns: 440795379773 ns
  [    1.289555] clocksource: Switched to clocksource tsc
  #274/1   ringbuf/ringbuf:OK
  #274/2   ringbuf/ringbuf_n:OK
  #274/3   ringbuf/ringbuf_map_key:OK
  #274/4   ringbuf/ringbuf_write:OK
  #274     ringbuf:OK
  #275     ringbuf_multi:OK
  [...]

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240621140828.18238-2-daniel@iogearbox.net
borkmann added a commit to cilium/kernel-bpf-ci that referenced this pull request Jun 24, 2024
@borkmann
selftests/bpf: Add more ring buffer test coverage
b39c934 
Add test coverage for reservations beyond the ring buffer size in order
to validate that bpf_ringbuf_reserve() rejects the request with NULL, all
other ring buffer tests keep passing as well:

  # ./vmtest.sh -- ./test_progs -t ringbuf
  [...]
  ./test_progs -t ringbuf
  [    1.165434] bpf_testmod: loading out-of-tree module taints kernel.
  [    1.165825] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
  [    1.284001] tsc: Refined TSC clocksource calibration: 3407.982 MHz
  [    1.286871] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fc34e357, max_idle_ns: 440795379773 ns
  [    1.289555] clocksource: Switched to clocksource tsc
  kernel-patches#274/1   ringbuf/ringbuf:OK
  kernel-patches#274/2   ringbuf/ringbuf_n:OK
  kernel-patches#274/3   ringbuf/ringbuf_map_key:OK
  kernel-patches#274/4   ringbuf/ringbuf_write:OK
  kernel-patches#274     ringbuf:OK
  kernel-patches#275     ringbuf_multi:OK
  [...]

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
[ Test fixups for getting BPF CI back to work ]
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240621140828.18238-2-daniel@iogearbox.net
kernel-patches-daemon-bpf bot pushed a commit that referenced this pull request Jun 24, 2024
@borkmann
selftests/bpf: Add more ring buffer test coverage
316930d 
Add test coverage for reservations beyond the ring buffer size in order
to validate that bpf_ringbuf_reserve() rejects the request with NULL, all
other ring buffer tests keep passing as well:

  # ./vmtest.sh -- ./test_progs -t ringbuf
  [...]
  ./test_progs -t ringbuf
  [    1.165434] bpf_testmod: loading out-of-tree module taints kernel.
  [    1.165825] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel
  [    1.284001] tsc: Refined TSC clocksource calibration: 3407.982 MHz
  [    1.286871] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fc34e357, max_idle_ns: 440795379773 ns
  [    1.289555] clocksource: Switched to clocksource tsc
  #274/1   ringbuf/ringbuf:OK
  #274/2   ringbuf/ringbuf_n:OK
  #274/3   ringbuf/ringbuf_map_key:OK
  #274/4   ringbuf/ringbuf_write:OK
  #274     ringbuf:OK
  #275     ringbuf_multi:OK
  [...]

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
[ Test fixups for getting BPF CI back to work ]
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240621140828.18238-2-daniel@iogearbox.net
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@kernel-patches-bot @ardbiesheuvel