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Upstream: Yes
Url: https://github.com/golang/go/issues/38604
From a6895a6a52aa5e865b8ee055a8bf85982c91b555 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Mon, 27 Apr 2020 17:43:35 -0700
Subject: [PATCH] syscall: on linux-arm64, prefer prlimit to {g,s}etrlimit
Reportedly some Docker images accept the prlimit64 system call,
used by syscall.prlimit, but prohibit the getrlimit and setrlimit
system calls.
Fixes #38604
Change-Id: I91ff9370450b4869098cc8e335bbb7b863060508
---
diff --git a/src/syscall/syscall_linux_arm64.go b/src/syscall/syscall_linux_arm64.go
index 6d3b3df..1ad9dd8 100644
--- a/src/syscall/syscall_linux_arm64.go
+++ b/src/syscall/syscall_linux_arm64.go
@@ -28,7 +28,7 @@
//sysnb Getegid() (egid int)
//sysnb Geteuid() (euid int)
//sysnb Getgid() (gid int)
-//sysnb Getrlimit(resource int, rlim *Rlimit) (err error)
+//sysnb getrlimit(resource int, rlim *Rlimit) (err error)
//sysnb Getuid() (uid int)
//sys Listen(s int, n int) (err error)
//sys Pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
@@ -41,7 +41,7 @@
//sysnb Setregid(rgid int, egid int) (err error)
//sysnb Setresgid(rgid int, egid int, sgid int) (err error)
//sysnb Setresuid(ruid int, euid int, suid int) (err error)
-//sysnb Setrlimit(resource int, rlim *Rlimit) (err error)
+//sysnb setrlimit(resource int, rlim *Rlimit) (err error)
//sysnb Setreuid(ruid int, euid int) (err error)
//sys Shutdown(fd int, how int) (err error)
//sys Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
@@ -171,6 +171,24 @@
return
}
+// Getrlimit prefers the prlimit64 system call. See issue 38604.
+func Getrlimit(resource int, rlim *Rlimit) error {
+ err := prlimit(0, resource, nil, rlim)
+ if err != ENOSYS {
+ return err
+ }
+ return getrlimit(resource, rlim)
+}
+
+// Setrlimit prefers the prlimit64 system call. See issue 38604.
+func Setrlimit(resource int, rlim *Rlimit) error {
+ err := prlimit(0, resource, rlim, nil)
+ if err != ENOSYS {
+ return err
+ }
+ return setrlimit(resource, rlim)
+}
+
func (r *PtraceRegs) PC() uint64 { return r.Pc }
func (r *PtraceRegs) SetPC(pc uint64) { r.Pc = pc }
diff --git a/src/syscall/zsyscall_linux_arm64.go b/src/syscall/zsyscall_linux_arm64.go
index b62383e..f20f05e 100644
--- a/src/syscall/zsyscall_linux_arm64.go
+++ b/src/syscall/zsyscall_linux_arm64.go
@@ -1158,7 +1158,7 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-func Getrlimit(resource int, rlim *Rlimit) (err error) {
+func getrlimit(resource int, rlim *Rlimit) (err error) {
_, _, e1 := RawSyscall(SYS_GETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
if e1 != 0 {
err = errnoErr(e1)
@@ -1312,7 +1312,7 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
-func Setrlimit(resource int, rlim *Rlimit) (err error) {
+func setrlimit(resource int, rlim *Rlimit) (err error) {
_, _, e1 := RawSyscall(SYS_SETRLIMIT, uintptr(resource), uintptr(unsafe.Pointer(rlim)), 0)
if e1 != 0 {
err = errnoErr(e1)
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