runtime: don't mlock on Ubuntu 5.4 systems
For #35777
For #37436
Fixes #40184
Change-Id: I68561497d9258e994d1c6c48d4fb41ac6130ee3a
Reviewed-on: https://go-review.googlesource.com/c/go/+/244059
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
diff --git a/src/runtime/os_linux_x86.go b/src/runtime/os_linux_x86.go
index d001e6e..97f8707 100644
--- a/src/runtime/os_linux_x86.go
+++ b/src/runtime/os_linux_x86.go
@@ -7,7 +7,10 @@
package runtime
-import "runtime/internal/atomic"
+import (
+ "runtime/internal/atomic"
+ "unsafe"
+)
//go:noescape
func uname(utsname *new_utsname) int
@@ -55,6 +58,36 @@
return
}
+ if major == 5 && minor == 4 && patch < 2 {
+ // All 5.4 versions of Ubuntu are patched.
+ procVersion := []byte("/proc/version\000")
+ f := open(&procVersion[0], _O_RDONLY, 0)
+ if f >= 0 {
+ var buf [512]byte
+ p := noescape(unsafe.Pointer(&buf[0]))
+ n := read(f, p, int32(len(buf)))
+ closefd(f)
+
+ needle := []byte("Ubuntu")
+ contains:
+ for i, c := range buf[:n] {
+ if c != needle[0] {
+ continue
+ }
+ if int(n)-i < len(needle) {
+ break
+ }
+ for j, c2 := range needle {
+ if c2 != buf[i+j] {
+ continue contains
+ }
+ }
+ // This is an Ubuntu system.
+ return
+ }
+ }
+ }
+
if major == 5 && (minor == 2 || minor == 3 && patch < 15 || minor == 4 && patch < 2) {
gsignalInitQuirk = mlockGsignal
if m0.gsignal != nil {
