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fix(caddyfile): infinite loop on unclosed braces (#7571)

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Update coredns/caddy to a version where Dispenser.NextBlock()
checks Next() and stops at EOF. This ensures forward progress
and prevents an infinite loop when a block is missing a closing '}'
under certain conditions.

Added a regression test.

Signed-off-by: Ville Vesilehto <ville@vesilehto.fi>
This commit is contained in:
Ville Vesilehto
2025-09-30 19:36:13 +03:00
committed by GitHub
parent 83ce0baeac
commit 9a57d9693c
3 changed files with 42 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
go.mod
View File

@@ -16,7 +16,7 @@ require (
github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.9
github.com/aws/aws-sdk-go-v2/service/route53 v1.58.4
github.com/aws/aws-sdk-go-v2/service/secretsmanager v1.39.6
github.com/coredns/caddy v1.1.3
github.com/coredns/caddy v1.1.4-0.20250930002214-15135a999495
github.com/dnstap/golang-dnstap v0.4.0
github.com/expr-lang/expr v1.17.6
github.com/farsightsec/golang-framestream v0.3.0

4
go.sum
View File

@@ -109,8 +109,8 @@ github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UF
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
github.com/cihub/seelog v0.0.0-20170130134532-f561c5e57575 h1:kHaBemcxl8o/pQ5VM1c8PVE1PubbNx3mjUr09OqWGCs=
github.com/cihub/seelog v0.0.0-20170130134532-f561c5e57575/go.mod h1:9d6lWj8KzO/fd/NrVaLscBKmPigpZpn5YawRPw+e3Yo=
github.com/coredns/caddy v1.1.3 h1:zy+rYOAhG1Qjxnaf4QGIglYpR3io9YTJ67abYbEgfwY=
github.com/coredns/caddy v1.1.3/go.mod h1:A6ntJQlAWuQfFlsd9hvigKbo2WS0VUs2l1e2F+BawD4=
github.com/coredns/caddy v1.1.4-0.20250930002214-15135a999495 h1:JFeOmbjLnVRhvmLHyuO3M1pfXWlPWpwkdM8UqXZRtBg=
github.com/coredns/caddy v1.1.4-0.20250930002214-15135a999495/go.mod h1:A6ntJQlAWuQfFlsd9hvigKbo2WS0VUs2l1e2F+BawD4=
github.com/coreos/go-semver v0.3.1 h1:yi21YpKnrx1gt5R+la8n5WgS0kCrsPp33dmEyHReZr4=
github.com/coreos/go-semver v0.3.1/go.mod h1:irMmmIw/7yzSRPWryHsK7EYSg09caPQL03VsM8rvUec=
github.com/coreos/go-systemd/v22 v22.5.0 h1:RrqgGjYQKalulkV8NGVIfkXQf6YYmOyiJKk8iXXhfZs=

55
test/corefile_test.go
View File

@@ -4,21 +4,44 @@ import (
"testing"
)
func TestCorefile1(t *testing.T) {
defer func() {
if r := recover(); r != nil {
t.Fatalf("Expected no panic, but got %v", r)
}
}()
// this used to crash
corefile := `\\\\ȶ.
// TestCorefileParsing tests the Corefile parsing functionality.
// Expected to not panic or timeout.
func TestCorefileParsing(t *testing.T) {
cases := []struct {
name string
corefile string
}{
{
// See: https://github.com/coredns/coredns/pull/4637
name: "PR4637_" + "NoPanicOnEscapedBackslashesAndUnicode",
corefile: `\\\\ȶ.
acl
`
i, _, _, _ := CoreDNSServerAndPorts(corefile)
defer func() {
if i != nil {
i.Stop()
}
}()
`,
},
{
// See: https://github.com/coredns/coredns/pull/7571
name: "PR7571_" + "InvalidBlockFailsToStart",
corefile: "\xD9//\n" +
"hosts#\x90\xD0{lc\x0C{\n" +
"'{mport\xEF1\x0C}\x0B''",
},
}
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
defer func() {
if r := recover(); r != nil {
t.Fatalf("Expected no panic, but got %v", r)
}
}()
i, _, _, _ := CoreDNSServerAndPorts(tc.corefile)
defer func() {
if i != nil {
i.Stop()
}
}()
})
}
}