[tor-commits] [tor/maint-0.3.0] Allow setsockopt(IPV6_V6ONLY) in sandbox.

[nickm@xxxxxxxxxxxxxx]

commit 16d2bce89310d68804bacabf5e87a90e8f7322af
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date:   Wed Jul 5 13:09:21 2017 -0400

    Allow setsockopt(IPV6_V6ONLY) in sandbox.
    
    Fixes bug 20247.  We started setting V6ONLY in 0.2.3.13-alpha and
    added the sandbox on 0.2.5.1-alpha.
---
 changes/bug20247     | 4 ++++
 src/common/sandbox.c | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/changes/bug20247 b/changes/bug20247
new file mode 100644
index 000000000..731cf0046
--- /dev/null
+++ b/changes/bug20247
@@ -0,0 +1,4 @@
+  o Minor bugfixes (linux seccomp2 sandbox):
+    - Avoid a sandbox failure when trying to re-bind to a socket and mark
+      it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
+
diff --git a/src/common/sandbox.c b/src/common/sandbox.c
index da96ad824..7f4511db2 100644
--- a/src/common/sandbox.c
+++ b/src/common/sandbox.c
@@ -728,6 +728,14 @@ sb_setsockopt(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
     return rc;
 #endif
 
+#ifdef IPV6_V6ONLY
+  rc = seccomp_rule_add_2(ctx, SCMP_ACT_ALLOW, SCMP_SYS(setsockopt),
+      SCMP_CMP(1, SCMP_CMP_EQ, IPPROTO_IPV6),
+      SCMP_CMP(2, SCMP_CMP_EQ, IPV6_V6ONLY));
+  if (rc)
+    return rc;
+#endif
+
   return 0;
 }
 



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