[tor/master] Allow getsockopt(…, SOL_SOCKET, SO_ACCEPTCONN, …) in sandbox

[dgoulet at torproject.org]

commit db3ee1d862272a36fb23adb208bfe84013e4b8f7
Author: Peter Gerber <peter at arbitrary.ch>
Date:   Tue Jan 22 21:47:43 2019 +0000

    Allow getsockopt(…, SOL_SOCKET, SO_ACCEPTCONN, …) in sandbox
    
    SO_ACCEPTCONN checks whether socket listening is enabled and is
    used ever since 9369152aae9527cc3764 has been merged.
    
    Closes ticket #29150
---
 src/lib/sandbox/sandbox.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/lib/sandbox/sandbox.c b/src/lib/sandbox/sandbox.c
index 1f0f5d858..b652397f5 100644
--- a/src/lib/sandbox/sandbox.c
+++ b/src/lib/sandbox/sandbox.c
@@ -832,6 +832,12 @@ sb_getsockopt(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
   if (rc)
     return rc;
 
+  rc = seccomp_rule_add_2(ctx, SCMP_ACT_ALLOW, SCMP_SYS(getsockopt),
+      SCMP_CMP(1, SCMP_CMP_EQ, SOL_SOCKET),
+      SCMP_CMP(2, SCMP_CMP_EQ, SO_ACCEPTCONN));
+  if (rc)
+    return rc;
+
 #ifdef HAVE_SYSTEMD
   rc = seccomp_rule_add_2(ctx, SCMP_ACT_ALLOW, SCMP_SYS(getsockopt),
       SCMP_CMP(1, SCMP_CMP_EQ, SOL_SOCKET),