CL 585358 adds restrictions to disallow pull-only linknames
(currently off by default). Currently, there are quite some pull-
only linknames in user code in the wild. In order not to break
those, we add push linknames to allow them to be pulled. This CL
includes linknames found in a large code corpus (thanks Matthew
Dempsky and Michael Pratt for the analysis!), that are not
currently linknamed.
Updates #67401.
Change-Id: I32f5fc0c7a6abbd7a11359a025cfa2bf458fe767
Reviewed-on: https://go-review.googlesource.com/c/go/+/586137
Reviewed-by: Russ Cox <rsc@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
As mentioned in CL 584598, linkname is a mechanism that, when
abused, can break API integrity and even safety of Go programs.
CL 584598 is a first step to restrict the use of linknames, by
implementing a blocklist. This CL takes a step further, tightening
up the restriction by allowing linkname references ("pull") only
when the definition side explicitly opts into it, by having a
linkname on the definition (possibly to itself). This way, it is at
least clear on the definition side that the symbol, despite being
unexported, is accessed outside of the package. Unexported symbols
without linkname can now be actually private. This is similar to
the symbol visibility rule used by gccgo for years (which defines
unexported non-linknamed symbols as C static symbols).
As there can be pull-only linknames in the wild that may be broken
by this change, we currently only enforce this rule for symbols
defined in the standard library. Push linknames are added in the
standard library to allow things build.
Linkname references to external (non-Go) symbols are still allowed,
as their visibility is controlled by the C symbol visibility rules
and enforced by the C (static or dynamic) linker.
Assembly symbols are treated similar to linknamed symbols.
This is controlled by -checklinkname linker flag, currently not
enabled by default. A follow-up CL will enable it by default.
Change-Id: I07344f5c7a02124dbbef0fbc8fec3b666a4b2b0e
Reviewed-on: https://go-review.googlesource.com/c/go/+/585358
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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Reviewed-by: Russ Cox <rsc@golang.org>
fixesgolang/go#67088
Change-Id: I42e7a8d02b161187772f147e3e136ab6e0f71d7f
Reviewed-on: https://go-review.googlesource.com/c/go/+/585059
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Fixes: #67184
Change-Id: Ibdf3810cbba30ae29f466f7f95f357e8512f228b
GitHub-Last-Rev: 5eabc760be
GitHub-Pull-Request: golang/go#67185
Reviewed-on: https://go-review.googlesource.com/c/go/+/583299
Reviewed-by: Ian Lance Taylor <iant@google.com>
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Auto-Submit: Ian Lance Taylor <iant@google.com>
OpenBSD 7.5 no longer has a syscall symbol in libc. This will
typically result in external linking failures since the syscall
package still has a reference to an undefined `syscall' symbol.
Remove these references and return ENOSYS if syscall.Syscall* or
syscall.RawSyscall* are used for a system call number that does not
currently have an internal remapping.
Fixes#63900
Change-Id: Ic757bf8872ad98a92dd5b34cf58312c32fbc9a96
Reviewed-on: https://go-review.googlesource.com/c/go/+/582257
Reviewed-by: Ian Lance Taylor <iant@google.com>
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OpenBSD 7.5 no longer supports indirect syscalls. A number of Go
packages make use of syscall.Syscall with SYS_IOCTL or SYS_SYSCTL,
since neither is well supported by golang.org/x/sys/unix. Reroute
calls with either of these system call numbers to the respective
libc stub so that they continue to work.
Updates #63900
Change-Id: I3323a3fa311ee9227e6220417834253763866881
Reviewed-on: https://go-review.googlesource.com/c/go/+/582256
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: David Chase <drchase@google.com>
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The existing implementation causes unnecessary heap allocations for
javascript syscalls: Call, Invoke, and New. The new change seeks to
hint the Go compiler to allocate arg slices with length <=16 to the
stack.
Original Work: CL 367045
- Calling a JavaScript function with 16 arguments or fewer will not
induce two additional heap allocations, at least with the current Go
compiler.
- Using syscall/js features with slices and strings of
statically-known length will not cause them to be escaped to the heap,
at least with the current Go compiler.
- The reduction in allocations has the additional benefit that the
garbage collector runs less often, blocking WebAssembly's one and only
thread less often.
Fixes#39740
Change-Id: I815047e1d4f8ada796318e2064d38d3e63f73098
GitHub-Last-Rev: 36df1b33a4
GitHub-Pull-Request: golang/go#66684
Reviewed-on: https://go-review.googlesource.com/c/go/+/576575
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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Provide appropriate implementations of Tc{get,set}pgrp and export
these for use in the TestForeground* tests in exec_unix_test.go.
This avoids calling ioctl via syscall.Syscall on BSDs.
Fixes#59667
Updates #63900
Change-Id: Ice4dcedae1f0931c026bddf33043d3864a52d44e
Reviewed-on: https://go-review.googlesource.com/c/go/+/572155
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Run-TryBot: Joel Sing <joel@sing.id.au>
The RtlGetNtVersionNumbers function is not documented by Microsoft.
Use RtlGetVersion instead, which is documented and available on all
supported versions of Windows.
Cq-Include-Trybots: luci.golang.try:gotip-windows-amd64-longtest,gotip-windows-arm64
Change-Id: Ibaf0e2c28e673951476c5d863a829fd166705aea
Reviewed-on: https://go-review.googlesource.com/c/go/+/571015
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The len parameter runtime.asan{read,write} is of type uintptr. Match its
type in Read and Write.
For #64611
Change-Id: I0be278c38a357e600521ced87c0e23038a11e8a2
Reviewed-on: https://go-review.googlesource.com/c/go/+/572755
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Now with internal/asan and internal/msan available we can cleanup
syscall's duplicated definitions.
For #64611
Change-Id: If714d04ed2d32a4ed27305b3e3dc64ba8cdd1b61
GitHub-Last-Rev: e52fff1513
GitHub-Pull-Request: golang/go#65935
Reviewed-on: https://go-review.googlesource.com/c/go/+/566755
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Change-Id: I99e5f6fab900b0bf301f78460c618c01b231f62b
Reviewed-on: https://go-review.googlesource.com/c/go/+/568956
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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For #65355
Change-Id: I9168d9a767e3b2ece65ac6dcab6827ab6f6b11bb
Reviewed-on: https://go-review.googlesource.com/c/go/+/560136
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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Auto-Submit: Ian Lance Taylor <iant@golang.org>
Change-Id: I0fcb79f471cdb8b464924d9b04c675f120861f67
Reviewed-on: https://go-review.googlesource.com/c/go/+/539835
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: shuang cui <imcusg@gmail.com>
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For #65355
Change-Id: I5fefe30dcb520159de565e61dafc74a740fc8730
Reviewed-on: https://go-review.googlesource.com/c/go/+/559715
Reviewed-by: Michael Pratt <mpratt@google.com>
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Fixes#62254Fixes#48622
Change-Id: Ida598e7fa914c8737fdbc1c813bcd68adb5119c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/542275
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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Auto-Submit: Ian Lance Taylor <iant@golang.org>
The comment being removed is no longer true as of CL 494916.
Change-Id: I4975866c58efb5c9c41db3640564ac7233f5840f
Reviewed-on: https://go-review.googlesource.com/c/go/+/542415
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Kirill Kolyshkin <kolyshkin@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
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Found by codespell.
Change-Id: I2ebefbbbc8eacf9bc83051407519fa8fd5e4495f
GitHub-Last-Rev: 9cc550f3db
GitHub-Pull-Request: golang/go#65346
Reviewed-on: https://go-review.googlesource.com/c/go/+/559095
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
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Reviewed-by: Michael Knyszek <mknyszek@google.com>
On Darwin, the ptrace syscall is called in ptrace1, which then be
called in ptrace. This allows ptrace1 be disabled on iOS (by
implementing ptrace differently). But we can also achieve this by
adding a conditional directly in ptrace. This reduces stack usage
with -N -l, while keeping ptrace disabled on iOS.
For #64113.
Change-Id: I89d8e317e77352fffdbb5a25ba21ee9cdf2e1e20
Reviewed-on: https://go-review.googlesource.com/c/go/+/545276
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
CL 520266 added pidfd_send_signal linux syscall numbers to the
syscall package for the sake of a unit test.
As pidfd_send_signal will be used from the os package, let's revert the
changes to syscall package, add the pidfd_send_signal syscall numbers
and the implementation to internal/syscall/unix, and change the above
test to use it.
Updates #51246.
For #62654.
Change-Id: I862174c3c1a64baf1080792bdb3a1c1d1b417bb4
Reviewed-on: https://go-review.googlesource.com/c/go/+/528436
Run-TryBot: Kirill Kolyshkin <kolyshkin@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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Reviewed-by: Michael Pratt <mpratt@google.com>
While working on CL 528798, I found out that sys.PidFD field (added
in CL 520266) is not filled in when CLONE_NEWUSER is used.
This happens because the code assumed that the parent and the child
run in the same memory space. This assumption is right only when
CLONE_VM is used for clone syscall, and the code only sets CLONE_VM
when CLONE_NEWUSER is not used.
Fix this, and add a test case (which fails before the fix).
Updates #51246.
Change-Id: I805203c1369cadd63d769568b132a9ffd92cc184
Reviewed-on: https://go-review.googlesource.com/c/go/+/542698
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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Auto-Submit: Michael Pratt <mpratt@google.com>
os.OpenFile on windows did not use the O_SYNC flag. This meant
that even if the user set O_SYNC, os.OpenFile would ignore it.
This change adds a new flag FILE_FLAG_WRITE_THROUGH, which is
the equivalent of O_SYNC flag on Linux and is documented in
https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfileaFixes#35358
Change-Id: Ib338caed5bb2f215723bfe30a2551a83998d92c9
GitHub-Last-Rev: 82c6275cb4
GitHub-Pull-Request: golang/go#64027
Reviewed-on: https://go-review.googlesource.com/c/go/+/541015
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Jes Cok <xigua67damn@gmail.com>
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Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
The fchmodat2 syscall was added in Linux kernel 6.6. Mirror the
implementation in golang.org/x/sys/unix.Fchmodat (CL 539635) and use
fchmodat2 in Fchmodat if flags are given. It will return ENOSYS on older
kernels (or EINVAL or any other bogus error in some container
implementations).
Also update ztypes_linux_$GOARCH.go for all linux platforms to add
_AT_EMPTY_PATH. It was added to linux/types in CL 407694 but was only
updated for linux/loong64 at that time.
Updates #61636
Change-Id: I863d06e35cd366f1cf99052e9f77c22ab8168b3f
Reviewed-on: https://go-review.googlesource.com/c/go/+/540435
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
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Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Provide ioctlPtr for all BSD platforms, then use this for BPF.
This reduces darwin specific code, as well as avoiding the use of
an indirect system call on OpenBSD.
Updates #63900
Change-Id: I81f3e74a3149150abe972f106903310e3cf26929
Reviewed-on: https://go-review.googlesource.com/c/go/+/540019
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
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Provide fcntlPtr for all BSD platforms, then use this for FcntlFlock.
This reduces darwin and openbsd specific code, as well as avoiding
the use of an indirect system call on OpenBSD.
Updates #63900
Change-Id: I5c701f0d8413fab5477b9e21381395621d1fb6d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/540018
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
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Reviewed-by: Josh Rickmar <jrick@zettaport.com>
Fix the following error introduced by CL 518627:
./mkall.sh: line 370: syntax error near unexpected token `)'
./mkall.sh: line 370: `openbsd_riscv64)'
Change-Id: I044563759bf07c94840f2024734d32a0ad663aab
Reviewed-on: https://go-review.googlesource.com/c/go/+/538935
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Heschi Kreinick <heschi@google.com>
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Reviewed-by: Bryan Mills <bcmills@google.com>
Tests in rlimit_test.go exist to test the behavior of automatically
bumping RLIMIT_NOFILE on Unix implemented in rlimit.go (issue #46279),
with darwin-specific behavior split out into rlimit_darwin.go and
the rest left empty in rlimit_stub.go.
Since the behavior happens only on Unix, it doesn't make sense to test
it on other platforms. Copy rlimit.go's 'unix' build constraint to
rlimit_test.go to accomplish that.
Also simplify the build constraint in rlimit_stub.go while here,
so that its maintenance is easier and it starts to match all
non-darwin Unix GOOS values (previously, 'hurd' happened to be missed).
In particular, this fixes a problem where TestOpenFileLimit was
failing in some environments when testing the wasip1/wasm port.
The RLIMIT_NOFILE bumping behavior isn't implemented there, so
the test was testing the environment and not the Go project.
Updates #46279.
For #61116.
Change-Id: Ic993f9cfc021d4cda4fe3d7fed8e2e180f78a2ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/539435
Reviewed-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
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Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
On openbsd, call getfsstat directly via libc, instead of calling it
via syscall.Syscall.
Updates #63900
Change-Id: Ib4c581160b170e6cc6017c42e959e647d97ac993
Reviewed-on: https://go-review.googlesource.com/c/go/+/538736
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Run-TryBot: Joel Sing <joel@sing.id.au>
This removes the unused writelen function, which was cleaned up for other
platforms in CL#529035.
Change-Id: I1999dc81276763bdc73d8590c16729447c4e8538
Reviewed-on: https://go-review.googlesource.com/c/go/+/538119
Reviewed-by: Bryan Mills <bcmills@google.com>
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Run-TryBot: Joel Sing <joel@sing.id.au>
The sysctl declaration was moved in CL 141639, however the files were
presumably not regenerated. There is no functional change, however
regenerating avoids unrelated noise in future diffs.
Change-Id: Ifb840b5853f3f1c3c88a3f94df21b6f6d3c635d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/538118
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Reviewed-by: Cherry Mui <cherryyz@google.com>
Changes trailing-NUL-counting behavior for abstract addresses
starting with the NUL character to be the same as abstract
addresses starting with the @ character.
For #63579.
Change-Id: I206e4d0d808396998cb7d92a9e26dda854cb1248
GitHub-Last-Rev: 0ff0a9c938
GitHub-Pull-Request: golang/go#63580
Reviewed-on: https://go-review.googlesource.com/c/go/+/535776
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Reviewed-by: Ian Lance Taylor <iant@google.com>
Change-Id: I8740a2a7ebb3045d8daa97bcb0da7f31f6f7b881
Reviewed-on: https://go-review.googlesource.com/c/go/+/531996
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Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
CL 531516 converted origRlimitNofile from an atomic.Value to
atomic.Pointer[Rlimit]. i.e., it changed from storing a value to storing
a pointer.
After storing a pointer to lim, the remainder of this function
immediately modifies it, thus mutating the value pointer to by
origRlimitNofile (and thus defeating the point of origRlimitNofile).
This broke the android-amd64-emu builder because it is (apparently) the
only builder where the original RLIMIT_NOFILE Cur != Max.
TestRlimitRestored is skipped on every other builder.
Change-Id: I12076350eeddfd221823ad651e7e7eca59d2bdcd
Reviewed-on: https://go-review.googlesource.com/c/go/+/532100
Run-TryBot: Michael Pratt <mpratt@google.com>
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Currently we are bootstrapping with Go 1.20, origRlimitNofile can
be changed to atomic.Pointer[Rlimit].
Change-Id: I00ce9d1a9030bd5dbd34e3dc6c4e38683a87be86
GitHub-Last-Rev: f2ccdb3841
GitHub-Pull-Request: golang/go#63274
Reviewed-on: https://go-review.googlesource.com/c/go/+/531516
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Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
createEnvBlock currently allocates multiple times: at least one to
convert the slice of strings into a NULL separated slice of bytes, and
then again to encode it as UTF-16. The logic to do so is also quite
complex.
This CL simplifies the logic by allocating only once by encoding the
slice of strings into UTF-16 directly using utf16.AppendRune.
goos: windows
goarch: amd64
pkg: syscall
cpu: Intel(R) Core(TM) i7-10850H CPU @ 2.70GHz
│ old.txt │ new.txt │
│ sec/op │ sec/op vs base │
CreateEnvBlock-12 37.92µ ± 24% 21.36µ ± 8% -43.66% (p=0.000 n=10)
│ old.txt │ new.txt │
│ B/op │ B/op vs base │
CreateEnvBlock-12 109.12Ki ± 0% 26.62Ki ± 0% -75.60% (p=0.000 n=10)
│ old.txt │ new.txt │
│ allocs/op │ allocs/op vs base │
CreateEnvBlock-12 4.000 ± 0% 1.000 ± 0% -75.00% (p=0.000 n=10)
Change-Id: If35f62c3926b486d5253a9ae23a33b979b2f02c2
Reviewed-on: https://go-review.googlesource.com/c/go/+/531355
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Windows 7 is no longer supported, there is no need to complicate the
code to support inheriting console handles.
Change-Id: Ie9f5cde77a63ea4fa6032bbb7ba5bd48a0989c5b
Reviewed-on: https://go-review.googlesource.com/c/go/+/531235
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Quim Muntal <quimmuntal@gmail.com>
Fixes the misuse of "a" vs "an", according to English grammatical
expectations and using https://www.a-or-an.com/
Change-Id: Ic9600dcbb3d843880349729478266c4b9bcf7316
Reviewed-on: https://go-review.googlesource.com/c/go/+/531335
Run-TryBot: shuang cui <imcusg@gmail.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This is a follow up of CL 528696.
Change-Id: I5b71eabedb12567c4b1b36f7182a3d2b0ed662a5
GitHub-Last-Rev: acaf3ac11c
GitHub-Pull-Request: golang/go#62713
Reviewed-on: https://go-review.googlesource.com/c/go/+/529197
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Also explicitly look up user "nobody" (or "gopher" on the Go builders)
if running as root, instead of hard-coding UID/GID 99.
Fixes#62719.
Change-Id: I9fa8955f2c239804fa775f2478a5274af9330822
Reviewed-on: https://go-review.googlesource.com/c/go/+/529795
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
CL 457995 introduced syscall_linux_accept.go which is used on linux/arm
to generate accept and use it in Accept. However, that CL forgot to
include the file in the list of files used with mksyscall.pl to generate
the syscall wrappers. This lead to accept no longer being generated when
re-running mkall.sh on linux/arm.
Change-Id: I7747399afae47a883a7fb079c82e835b90f366cf
Reviewed-on: https://go-review.googlesource.com/c/go/+/529055
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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Russ Cox
Tobias Klauser
Cherry Mui
Michael Stapelberg
lifubang
Joel Sing
Jacob
qmuntal
Mauri de Souza Meneguzzo
Andy Pan
guoguangwu
cui fliter
Kir Kolyshkin
Jes Cok
Michael Pratt
Dmitri Shuralyov
F Y
Ian Lance Taylor
Bryan C. Mills