diff --git a/src/main/codex-accounts/legacy-wsl-runtime-auth-drain-apply-script.test.ts b/src/main/codex-accounts/legacy-wsl-runtime-auth-drain-apply-script.test.ts
index 8a176a5960a..79164cef58b 100644
--- a/src/main/codex-accounts/legacy-wsl-runtime-auth-drain-apply-script.test.ts
+++ b/src/main/codex-accounts/legacy-wsl-runtime-auth-drain-apply-script.test.ts
@@ -7,6 +7,7 @@ import {
   mkdtempSync,
   readFileSync,
   rmSync,
+  symlinkSync,
   writeFileSync
 } from 'node:fs'
 import { tmpdir } from 'node:os'
@@ -37,6 +38,8 @@ function runApply(
     rewriteAfterHashCall?: number
     rewriteBeforeDelete?: boolean
     rewriteSourceBeforeDelete?: boolean
+    symlinkSource?: boolean
+    symlinkTarget?: boolean
   } = {}
 ): ApplyOutcome {
   const root = mkdtempSync(join(tmpdir(), 'orca-drain-race-'))
@@ -51,6 +54,18 @@ function runApply(
   const marker = join(root, 'marker')
   writeFileSync(sourcePath, SOURCE)
   writeFileSync(targetPath, TARGET)
+  if (options.symlinkSource) {
+    const sourceBytes = join(root, 'source-bytes')
+    writeFileSync(sourceBytes, SOURCE)
+    rmSync(sourcePath)
+    symlinkSync(sourceBytes, sourcePath)
+  }
+  if (options.symlinkTarget) {
+    const targetBytes = join(root, 'target-bytes')
+    writeFileSync(targetBytes, TARGET)
+    rmSync(targetPath)
+    symlinkSync(targetBytes, targetPath)
+  }
   const counter = join(root, 'counter')
   writeFileSync(counter, '0')
   const shim = join(bin, 'sha256sum')
@@ -184,6 +199,18 @@ describe.skipIf(isWindows)('legacy WSL auth drain race guard', () => {
     expect(outcome.target).toBe(NEWER)
     expect(outcome.marker).toBe(false)
   })
+  it('rejects a symlinked source auth file', () => {
+    const outcome = runApply({ symlinkSource: true })
+    expect(outcome.status).toBe(35)
+    expect(outcome.source).toBe(SOURCE)
+    expect(outcome.marker).toBe(false)
+  })
+  it('rejects a symlinked destination auth file', () => {
+    const outcome = runApply({ symlinkTarget: true })
+    expect(outcome.status).toBe(36)
+    expect(outcome.source).toBe(SOURCE)
+    expect(outcome.marker).toBe(false)
+  })
   it('restores verified source bytes when the source path is atomically replaced', () => {
     const outcome = runApply({ rewriteSourceBeforeDelete: true })
     expect(outcome.status).toBe(40)
diff --git a/src/main/codex-accounts/legacy-wsl-runtime-auth-drain-scripts.ts b/src/main/codex-accounts/legacy-wsl-runtime-auth-drain-scripts.ts
index 884bc85bbcb..f71e6bb471e 100644
--- a/src/main/codex-accounts/legacy-wsl-runtime-auth-drain-scripts.ts
+++ b/src/main/codex-accounts/legacy-wsl-runtime-auth-drain-scripts.ts
@@ -22,7 +22,9 @@ fi
 [ ! -e "$destination_recovery_auth" ] && [ ! -L "$destination_recovery_auth" ] || { [ -f "$destination_recovery_auth" ] && [ ! -L "$destination_recovery_auth" ] || exit 46; chmod 600 "$destination_recovery_auth"; }
 ${RESOLVE_LEGACY_HOME_SCRIPT}
 source_auth="$legacy_home/auth.json"
-if [ ! -e "$source_auth" ] && [ ! -L "$source_auth" ]; then
+if [ -e "$source_auth" ] || [ -L "$source_auth" ]; then
+  [ -f "$source_auth" ] && [ ! -L "$source_auth" ] || exit 46
+else
   if [ -f "$source_recovery_auth" ] && [ ! -L "$source_recovery_auth" ]; then
     mv -- "$source_recovery_auth" "$source_auth"; chmod 600 "$source_auth"
   elif [ -f "$source_quarantine_auth" ] && [ ! -L "$source_quarantine_auth" ]; then
@@ -31,11 +33,11 @@ if [ ! -e "$source_auth" ] && [ ! -L "$source_auth" ]; then
     exit 46
   fi
 fi
-[ -f "$source_auth" ] || exit ${SOURCE_AUTH_ABSENT_EXIT}
+[ -f "$source_auth" ] && [ ! -L "$source_auth" ] || exit ${SOURCE_AUTH_ABSENT_EXIT}
 encode_file() { base64 < "$1" | tr -d '\\n'; }
 encode_file "$source_auth"; printf '\\n'
 source_credentials="$legacy_home/.credentials.json"
-if [ -f "$source_credentials" ]; then printf 'present\\n'; encode_file "$source_credentials"; printf '\\n'; elif [ ! -e "$source_credentials" ] && [ ! -L "$source_credentials" ]; then printf 'missing\\n\\n'; else exit 44; fi
+if [ -f "$source_credentials" ] && [ ! -L "$source_credentials" ]; then printf 'present\\n'; encode_file "$source_credentials"; printf '\\n'; elif [ ! -e "$source_credentials" ] && [ ! -L "$source_credentials" ]; then printf 'missing\\n\\n'; else exit 44; fi
 `
 
 // Freeze a verified destination snapshot before source quarantine so the
@@ -55,7 +57,7 @@ ${RESOLVE_LEGACY_HOME_SCRIPT}
 target_home=$(readlink -f -- "$4") || exit 33
 [ "$legacy_home" != "$target_home" ] || exit 34
 source_auth="$legacy_home/auth.json"; target_auth="$target_home/auth.json"
-[ -f "$source_auth" ] || exit 35; [ -f "$target_auth" ] || exit 36
+[ -f "$source_auth" ] && [ ! -L "$source_auth" ] || exit 35; [ -f "$target_auth" ] && [ ! -L "$target_auth" ] || exit 36
 hash_file() { sha256sum -- "$1" | cut -d ' ' -f 1; }
 if [ -e "$source_quarantine_auth" ] || [ -L "$source_quarantine_auth" ]; then
   [ -f "$source_quarantine_auth" ] && [ ! -L "$source_quarantine_auth" ] || exit 46
@@ -89,7 +91,8 @@ cleanup() {
   [ ! -f "$drain_marker" ] || rm -f -- "$source_recovery_auth" "$source_quarantine_auth"
   rm -f -- "$temporary_auth" "$temporary_credentials" "$destination_pin" "$temporary_destination_snapshot" "$temporary_source_snapshot" "$temporary_marker"
 }
-trap cleanup EXIT HUP INT TERM
+trap cleanup EXIT
+trap 'cleanup; exit 129' HUP INT TERM
 ln -- "$target_auth" "$destination_pin"
 [ "$(hash_file "$destination_pin")" = "$6" ] || exit 38
 [ "$target_auth" -ef "$destination_pin" ] || exit 38
@@ -136,5 +139,5 @@ set -eu
 [ ! -f "$3" ] || exit 0
 ${RESOLVE_LEGACY_HOME_SCRIPT}
 [ ! -e "$legacy_home/auth.json" ] && [ ! -L "$legacy_home/auth.json" ] || exit 41
-umask 077; marker_parent=\${3%/*}; mkdir -p -- "$marker_parent"; temporary_marker="$3.orca-drain-$$"; trap 'rm -f -- "$temporary_marker"' EXIT HUP INT TERM; printf '%s\\n' '{"completed":true}' > "$temporary_marker"; chmod 600 "$temporary_marker"; mv -f -- "$temporary_marker" "$3"
+umask 077; marker_parent=\${3%/*}; mkdir -p -- "$marker_parent"; temporary_marker="$3.orca-drain-$$"; trap 'rm -f -- "$temporary_marker"' EXIT; trap 'rm -f -- "$temporary_marker"; exit 129' HUP INT TERM; printf '%s\\n' '{"completed":true}' > "$temporary_marker"; chmod 600 "$temporary_marker"; mv -f -- "$temporary_marker" "$3"
 `