This CL instructs the Go x86 compiler to load the frame pointer address
using a MOV instead of a LEA instruction, being MOV 1 byte shorter:
Before
55 PUSHQ BP
48 8d 2c 24 LEAQ 0(SP), BP
After
55 PUSHQ BP
48 89 e5 MOVQ SP, BP
This reduces the size of the Go toolchain ~0.06%.
Updates #6853
Change-Id: I5557cf34c47e871d264ba0deda9b78338681a12c
Reviewed-on: https://go-review.googlesource.com/c/go/+/463845
Auto-Submit: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Change-Id: I7aa2bb4560198a7d9d9e4321f60dec38f6834bdc
Reviewed-on: https://go-review.googlesource.com/c/go/+/463745
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
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This synchronizes the supported build modes between cmd/dist and
internal/platform, and adds a test to keep them in synch.
In order to do that, this has several changes to cmd/dist, and one
change to internal/platform.
If the build dashboard is green after this is submitted, we can
probably make the functions identical.
Change-Id: Ia78ce76b193399058fde79e38dd9f23818e566a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/463992
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
While we're here rename setupplt to setupPLT.
This is a pure naming change with no semantic change.
Change-Id: Ib0312fb6568475b620dab7632438b4d25e4d9cc0
Reviewed-on: https://go-review.googlesource.com/c/go/+/463744
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
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Run-TryBot: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Make all the tests for whether -buildmode=c-archive is supported consistent.
Base this on the historical code, on whether cmd/compile supports -shared,
and whether cmd/link permits the mode.
Change-Id: Ib996546906f698ade4c32b8e6c705838e4ad4b90
Reviewed-on: https://go-review.googlesource.com/c/go/+/463984
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
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Change-Id: If0e034d9ebf2baeb89cb52b22aedbe923cc703ff
Reviewed-on: https://go-review.googlesource.com/c/go/+/463983
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
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For #36435
Change-Id: Ie733b641f20ca5bcee3784c088eb27699890a151
Reviewed-on: https://go-review.googlesource.com/c/go/+/463982
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
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This error dates back to when the method was introduced in CL 6531.
It only matters for the rare case of building tests on one GOOS and
running them on another, and only makes a difference for the rare case
where one GOOS supports external linking and another does not.
Change-Id: I1a7abfb0a5bbec49ddbcd9c1a4f5c0ec43a8095c
Reviewed-on: https://go-review.googlesource.com/c/go/+/463991
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
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Auto-Submit: Ian Lance Taylor <iant@golang.org>
The strconv docs are not very helpful for people who just want to pick
a reasonable default, for example the one used by the fmt package to
show floats.
Add an example illustrating what the fmt package uses.
Change-Id: Iefefa70dfd4d4bfa9962a20654ee23662818ef38
Reviewed-on: https://go-review.googlesource.com/c/go/+/463980
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Also set it on the Go builders, so that the builders more closely
match releases.
It looks like this change was intended to be included in CL 454836,
but was commented out at some point — perhaps during debugging? —
before that change was merged.
For #24904.
Change-Id: Ib501274520c5de366d4e9d87a1bd3c6ba2d2413f
Reviewed-on: https://go-review.googlesource.com/c/go/+/463740
Run-TryBot: Bryan Mills <bcmills@google.com>
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For internal linking, at the point where we finish reading libgcc.a,
if the symbol "__stack_chk_local" is still undefined, then read
in the host archive libc_nonshared.a as well.
Updates #57261.
Change-Id: I0b1e485aa50aa7940db8cabcb3b9a7959bf99ce7
Reviewed-on: https://go-review.googlesource.com/c/go/+/456856
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
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Certain ios and android configurations do not yet support internal
linking.
On ios, attempting to build without cgo causes tests to fail on
essentially every run (#57961).
On android, it produces a lot of warning spam from the linker,
obscuring real problems.
Since external linking makes the result of `go install` depend on the
installed C toolchain either way, the reproducibility benefit of
disabling cgo seems minimal on these platforms anyway.
Fixes#57961.
For #24904.
Updates #57007.
Change-Id: Ied2454804e958dd670467db3d5e9ab50a40bb899
Reviewed-on: https://go-review.googlesource.com/c/go/+/463739
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
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TryBot-Bypass: Bryan Mills <bcmills@google.com>
This CL changes how the x86 compiler stores and loads the frame pointer
on each function prologue and epilogue, with the goal to reduce the
final binary size without affecting performance.
The compiler is currently using MOV instructions to load and store BP,
which can take from 5 to 8 bytes each.
This CL changes this approach so it emits PUSH/POP instructions instead,
which always take only 1 byte each (when operating with BP). It can also
avoid using the SUBQ/ADDQ to grow the stack for functions that have
frame pointer but does not have local variables.
On Windows, this CL reduces the go toolchain size from 15,697,920 bytes
to 15,584,768 bytes, a reduction of 0.7%.
Example of epilog and prologue for a function with 0x10 bytes of
local variables:
Before
===
SUBQ $0x18, SP
MOVQ BP, 0x10(SP)
LEAQ 0x10(SP), BP
... function body ...
MOVQ 0x10(SP), BP
ADDQ $0x18, SP
RET
===
After
===
PUSHQ BP
LEAQ 0(SP), BP
SUBQ $0x10, SP
... function body ...
MOVQ ADDQ $0x10, SP
POPQ BP
RET
===
Updates #6853
Change-Id: Ice9e14bbf8dff083c5f69feb97e9a764c3ca7785
Reviewed-on: https://go-review.googlesource.com/c/go/+/462300
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
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Now that the development of the Go 1.20 release is almost done, its
release notes are moved to their eventual long-term home in x/website
in CL 464075. Delete the initial development copy here.
For golang/go#54202.
Change-Id: Ia402d1abd4539fbce415e2a7dffd6709186f08a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/464055
Auto-Submit: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
This is a pure cleanup to bring the ELF hooks together.
Change-Id: I01d5227c70f30e4a659dcd7904e7c247266e95b1
Reviewed-on: https://go-review.googlesource.com/c/go/+/463981
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
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Reviewed-by: Joel Sing <joel@sing.id.au>
This will be part of the standard library soon and then
cmd/go can use it directly, but I am writing a few more instances
of this pattern today and wanted to clean these up first.
Change-Id: I3a7336039949ffe95a403aed08d79206c91eafb7
Reviewed-on: https://go-review.googlesource.com/c/go/+/464115
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
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For #56986, add the new directive analyzer that catches
misplaced //go:debug lines.
Ran 'go mod vendor' after adding the import in vet
to bring in the vendored files.
A followup CL will enable it by default in 'go test'.
Change-Id: I12c46e292b31bdbf5ceb86ba4474545e78a83a47
Reviewed-on: https://go-review.googlesource.com/c/go/+/462201
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Updates #57237
Change-Id: Ib626610130cae9c1d1aff5dd2a5035ffde0e127f
Reviewed-on: https://go-review.googlesource.com/c/go/+/463985
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: xie cui <523516579@qq.com>
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NodeJS 18 introduced support for the fetch API for
making HTTP requests. This broke all wasm tests
that were relying on NodeJS falling back to the fake
network implementation in net_fake.go. Disable
the fetch API on NodeJS to get tests passing.
Fixes#57613
Change-Id: Icb2cce6d5289d812da798e07366f8ac26b5f82cb
Reviewed-on: https://go-review.googlesource.com/c/go/+/463976
Reviewed-by: Evan Phoenix <evan@phx.io>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
The move to NodeJS 18 allows us to replace the custom
crypto functions with the expanded crypto primitives of
the NodeJS crypto library.
Fixes#56860
Change-Id: I8726b4003150f31521f246f613b6976641b9fa69
Reviewed-on: https://go-review.googlesource.com/c/go/+/463975
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Evan Phoenix <evan@phx.io>
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The path /bin/bash is not available on all operating systems.
Use /usr/bin/env bash to find the system bash interpreter.
Change-Id: I493e462a8e261b7fbbd3f3c0b1d10e55c5ed783b
Reviewed-on: https://go-review.googlesource.com/c/go/+/463977
Reviewed-by: Bryan Mills <bcmills@google.com>
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Run-TryBot: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Evan Phoenix <evan@phx.io>
The upgrade to NodeJS 18 introduces various library
updates that mean we can no longer override the global
performance package. Instead, rely on the performance
library provided by the NodeJS runtime.
Fixes#57516
Change-Id: Ic8ed902c696ad154f676e0b74b42efb84f02f8db
Reviewed-on: https://go-review.googlesource.com/c/go/+/463234
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
The purpose of building the host toolchain is so that we can use it to
build and test the target configuration.
The host configuration should already be tested separately (with its
own builder), so we do not need to build the parts of that
configuration that are not relevant to the task of building and
testing the target configuration.
Updates #47257.
Change-Id: I814778d2d65b1f2887c9419232b5bfd4068f58af
Reviewed-on: https://go-review.googlesource.com/c/go/+/461676
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Since packages in "std" no longer have install targets, checking them
for staleness is somewhat meaningless: if they are not cached they
will be rebuilt anyway, and without installed archives against which
we can compare them the staleness check will not detect builder skew.
It would still be meaningful to check "cmd" for staleness, but
(especially on sharded VM-based builders) that is a fairly expensive
operation relative to its benefit. If we are really interested in
detecting builder skew and/or build reproducibility, we could instead
add a "misc" test (similar to "misc/reboot", or perhaps even a part of
that test) that verifies that bootstrapped binaries are reproducible.
For #57734.
Updates #47257.
Updates #56896.
Change-Id: I8683ee81aefe8fb59cce9484453df9729bdc587c
Reviewed-on: https://go-review.googlesource.com/c/go/+/452775
Run-TryBot: Bryan Mills <bcmills@google.com>
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go get golang.org/x/tools@ff9bea528a4d (CL 462817, 2023-01-19)
go mod tidy
go mod vendor
This sets up for using passes/directive in cmd/vet
(that CL will add those actual files, with a new go mod vendor).
Note that it also brings in golang.org/x/sys@17fce3a (CL 463675, 2023-01-26),
to get v0.4.0 with the bug fixed in that CL to keep the build working.
The update of x/sys is in both std and cmd to keep them in sync.
Change-Id: If8528f4667d14e674b986830abd41a7c733a3969
Reviewed-on: https://go-review.googlesource.com/c/go/+/462200
Auto-Submit: Russ Cox <rsc@golang.org>
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PutAbstractFunc doesn't use FnState.Filesym, so it isn't needed, but
more importantly it is misleading. DwarfAbstractFunc is frequently used
on inlined functions from outside the current compilation unit. For
those function, ctxt.fileSymbol returns nil, meaning it probably isn't
safe to use if the original compilation unit could also generate an
abstract func with the correct file symbol.
Change-Id: I0e6c76e41d75ac9ca07e0f775e49d791249e1c5d
Reviewed-on: https://go-review.googlesource.com/c/go/+/458198
Reviewed-by: Than McIntosh <thanm@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
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Run-TryBot: Michael Pratt <mpratt@google.com>
This test set is a bit hard to follow due to trying to test both
variable and function declaration location information.
Now that we have additional helpers to avoid duplication, it isn't too
much work to split them up into individually more understandable tests.
Change-Id: I619ac82ac3b5d00683e22a4a2064e2a5b15e8ce9
Reviewed-on: https://go-review.googlesource.com/c/go/+/458197
Auto-Submit: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
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Reviewed-by: Than McIntosh <thanm@google.com>
Many tests build a program just to analyze it with dwtest.Examiner. Add
gobuildAndExamine, a helper that returns Examiner directly to reduce
duplication in these tests.
Many tests also lookup the DIE for a specific subprogram, which includes
several verification steps. Package those up in findSubprogramDIE.
Change-Id: I72202ba289ae8389b682be525ff7e6cfbfc00ff3
Reviewed-on: https://go-review.googlesource.com/c/go/+/458196
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
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The two crypto modules are both named "asm". If both are included in a
single go.work (e.g., from `go work use -r .` in the repo), builds break
from "module asm appears multiple times in workspace".
Give these modules fully-qualified names to avoid conflicts. While we
are here, also expand the name of two other testdata modules. Those
modules don't currently conflict, but they have vague names at risk of
future conflicts.
Fixes#57769.
Change-Id: I2bd8a505051e92348d49560ec698ed921f2c81be
Reviewed-on: https://go-review.googlesource.com/c/go/+/461896
Reviewed-by: Bryan Mills <bcmills@google.com>
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Reviewed-by: Filippo Valsorda <filippo@golang.org>
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Auto-Submit: Michael Pratt <mpratt@google.com>
DW_AT_decl_line provides the line number of function declarations (the
line containing the func keyword). This is the equivalent to CL 429638,
but provided via DWARF.
Note that the file of declarations (DW_AT_decl_file) is already provided
for non-inlined functions. It is omitted for inlined functions because
those DWARF subprograms may be generated outside of their source
compilation unit, where referencing the file table is difficult.
Fixes#57308.
Change-Id: I3ad12e1f366c4465c2a588297988a5825ef7efec
Reviewed-on: https://go-review.googlesource.com/c/go/+/458195
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Zeroing requires a non-K0 mask register be specified.
(gcc enforces this when assembling.)
The non-K0 restriction is already handled by the Yknot0 restriction.
But if the mask register is missing altogether, we misassemble the
instruction.
Fixes#57952
Not sure if this is really worth mentioning in the release notes,
but just in case I'll mark it.
RELNOTE=yes
Change-Id: I8f05d3155503f1f16d1b5ab9d67686fe5b64dfea
Reviewed-on: https://go-review.googlesource.com/c/go/+/463229
Auto-Submit: Keith Randall <khr@golang.org>
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Reviewed-by: Илья Токарь <tocarip@gmail.com>
Reviewed-by: Iskander Sharipov <quasilyte@gmail.com>
CL 463219 broke TestAllDependencies because zsyscall_windows.go
was not correctly formatted, probably edited by hand.
The failure was not catch by the CL builders because it is
only failing on linux longtests builders, which was not executed.
Windows builders skip that test because it lacks of the `diff` command.
Change-Id: Id02992d71be2db7e9d3d169545679ab957f3be7f
Reviewed-on: https://go-review.googlesource.com/c/go/+/463841
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
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Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
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This CL sets the FILE_SKIP_COMPLETION_PORT_ON_SUCCESS notification mode
for all udp and tcp networks.
When SetFileCompletionNotificationModes was implemented, back in
go 1.2 [1], it was not possible to enable this mode on udp connections
because it is buggy on Windows 7 and earlier. The bug was fixed on
Windows 8. We can safely enable this mode now, since go 1.21
will require Windows 10 or higher.
While here, I noticed that this mode is only enabled for tcp, but not
for tcp4 nor tcp6. I don't think this restriction makes sense, so I'm
lifting it.
The performance gains are relevant:
name old time/op new time/op delta
ReadWriteMsgUDPAddrPort-12 13.3µs ± 4% 11.2µs ± 8% -15.90% (p=0.000 n=10+9)
WriteToReadFromUDP-12 14.5µs ±18% 11.4µs ± 4% -21.35% (p=0.000 n=10+9)
WriteToReadFromUDPAddrPort-12 13.4µs ± 3% 11.0µs ± 2% -18.00% (p=0.000 n=10+9)
[1] https://codereview.appspot.com/12409044
Change-Id: Idf41c35898beceac39d21decb47910f7d8ac247b
Reviewed-on: https://go-review.googlesource.com/c/go/+/463839
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Reviewed-by: Bryan Mills <bcmills@google.com>
zoneinfo_abbrs hasn't been updated since go 1.14, it's time to
regenerate it.
Updates #58113
Change-Id: Ic156ae607c46f1f5a9408b1fc0b56de6c14a4ed4
Reviewed-on: https://go-review.googlesource.com/c/go/+/463838
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
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Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
This generates GetTempPath2. Go now tries to determine if the windows it runs on has GetTempPath2 by finding it only once at the loading time. If GetTempPath2 exists, it sets the flag so that any calls to tempDir will use it. If it doesn't exist, Go then uses GetTempPath.
GetTempPath2 was generated into internal/syscall/windows since syscall is locked down.
Fixes#56899
Change-Id: Iff08502aebc787fde802ee9496c070c982fbdc08
GitHub-Last-Rev: b779389534
GitHub-Pull-Request: golang/go#57980
Reviewed-on: https://go-review.googlesource.com/c/go/+/463219
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
On Windows the registry data type REG_EXPAND_SZ indicates that the string requires expansion
of environment variables. The existing implementation doesn't take that into consideration
and just returns the unexpanded string, ignoring the registry type. This implementation ensures
that environment variables are properly expanded when needed.
Fixes#57576
Change-Id: Ia02c1b05a4cf6eaaffb3be88ce1c9ee100db250f
Reviewed-on: https://go-review.googlesource.com/c/go/+/460535
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
ir.VisitFuncsBottomUp returns recursive==true for functions which
call themselves. It also returns any closures inside that function.
We don't want to report the closures as recursive, as they really
aren't. Only the containing function is recursive.
Fixes#54159
Change-Id: I3b4d6710a389ec1d6b250ba8a7065f2e985bdbe1
Reviewed-on: https://go-review.googlesource.com/c/go/+/463233
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
This environment variable appears to never be used; according to
https://cs.opensource.google/search?q=META_BUILDLET_HOST_TYPE&ss=go&ssfr=1
this is the only reference to it in the whole Go project.
Change-Id: I6426a1d9e16441358c0e88daf4358112e659b2a9
Reviewed-on: https://go-review.googlesource.com/c/go/+/463741
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Manually consolidate the remaining ppc64/ppc64le test which
are not so trivial to automatically merge.
The remaining ppc64le tests are limited to cases where load/stores are
merged (this only happens on ppc64le) and the race detector (only
supported on ppc64le).
Change-Id: I1f9c0f3d3ddbb7fbbd8c81fbbd6537394fba63ce
Reviewed-on: https://go-review.googlesource.com/c/go/+/463217
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Use a small python script to consolidate duplicate
ppc64/ppc64le tests into a single ppc64x codegen test.
This makes small assumption that anytime two tests with
for different arch/variant combos exists, those tests
can be combined into a single ppc64x test.
E.x:
// ppc64le: foo
// ppc64le/power9: foo
into
// ppc64x: foo
or
// ppc64: foo
// ppc64le: foo
into
// ppc64x: foo
import glob
import re
files = glob.glob("codegen/*.go")
for file in files:
with open(file) as f:
text = [l for l in f]
i = 0
while i < len(text):
first = re.match("\s*// ?ppc64(le)?(/power[89])?:(.*)", text[i])
if first:
j = i+1
while j < len(text):
second = re.match("\s*// ?ppc64(le)?(/power[89])?:(.*)", text[j])
if not second:
break
if (not first.group(2) or first.group(2) == second.group(2)) and first.group(3) == second.group(3):
text[i] = re.sub(" ?ppc64(le|x)?"," ppc64x",text[i])
text=text[:j] + (text[j+1:])
else:
j += 1
i+=1
with open(file, 'w') as f:
f.write("".join(text))
Change-Id: Ic6b009b54eacaadc5a23db9c5a3bf7331b595821
Reviewed-on: https://go-review.googlesource.com/c/go/+/463220
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Updates #57237
Change-Id: I149c8b7eeac91b87b5810250f96d48ca87135807
Reviewed-on: https://go-review.googlesource.com/c/go/+/463218
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Run-TryBot: xie cui <523516579@qq.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
We currently check for at least three different permission bits before
running tests that require root permissions: we look for UID 0, lack
of an LXC container, and lack of a Docker container, and probe a
number of distro-specific files in /proc and /sys.
The sheer number of these checks suggests that we have probably missed
at least one. Per Alan J. Perlis, “If you have a procedure with ten
parameters, you probably missed some.” (And, indeed, we definitely
have: a Debian patch¹ adds one more environment check!)
CL 58170 added some of these container checks, but “decided to go this
way instead of just skipping os.IsPermission errors because many of
those tests were specifically written to check false positive
permission errors.” However, we can't in general distinguish between a
false-positive error and a real one caused by a container: if one is
making a change to the syscall package, they should run the tests with
-v and check for unexpected skips.
Notably:
- TestUnshare already skips itself if the command fails with an error
ending in the string "operation not permitted", which could be caused
by a variety of possible bugs.
- The Unshare tests added in CL 38471 will fail with a permission
error if CLONE_NEWNS is not supported, but it seems to me that if
CLONE_NEWNS is supported — sufficient to start the process! — then
Unmount must also be supported, and the test can at least check that
the two are consistent.
- The AmbientCaps tests should fail to start the subprocess with
EINVAL or similar (not produce bogus output) if the kernel does not
support ambient caps for any reason, which we can then detect.
(If the subprocess fails in the way the test is concerned about, it
will exit with status 2, not fail to start in the first place.)
By executing the system calls and checking for permission errors,
this change exposed an existing bug for AmbientCaps (filed as #57208),
which was detected by the linux-arm-aws builder.
For #57208.
Updates #21379.
Updates #14693.
¹https://sources.debian.org/patches/golang-1.19/1.19.3-1/0006-skip-userns-test-in-schroot-as-well.patch/
Change-Id: I9b167661fa1bb823168c8b50d8bbbf9643e49f76
Reviewed-on: https://go-review.googlesource.com/c/go/+/456375
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Alexander Morozov <lk4d4math@gmail.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
