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From 35956d8211ef0a606a117ca3f0ba3ae163c31a39 Mon Sep 17 00:00:00 2001
From: Lonnie Abelbeck <lonnie@abelbeck.com>
Date: Tue, 1 Oct 2019 09:05:09 -0500
Subject: Deny (non-fatal) shmget/shmat/shmdt in preauth privsep child.
New wait_random_seeded() function on OpenSSL 1.1.1d uses shmget, shmat, and shmdt
in the preauth codepath, deny (non-fatal) in seccomp_filter sandbox.
Bug: https://github.com/openssh/openssh-portable/pull/149
Bug-Debian: https://bugs.debian.org/941663
Origin: upstream, https://anongit.mindrot.org/openssh.git/commit/?id=3ef92a657444f172b61f92d5da66d94fa8265602
Last-Update: 2019-10-05
Patch-Name: seccomp-handle-shm.patch
---
sandbox-seccomp-filter.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/sandbox-seccomp-filter.c b/sandbox-seccomp-filter.c
index ef4de8c65..e8f31555e 100644
--- a/sandbox-seccomp-filter.c
+++ b/sandbox-seccomp-filter.c
@@ -149,6 +149,15 @@ static const struct sock_filter preauth_insns[] = {
#ifdef __NR_stat64
SC_DENY(__NR_stat64, EACCES),
#endif
+#ifdef __NR_shmget
+ SC_DENY(__NR_shmget, EACCES),
+#endif
+#ifdef __NR_shmat
+ SC_DENY(__NR_shmat, EACCES),
+#endif
+#ifdef __NR_shmdt
+ SC_DENY(__NR_shmdt, EACCES),
+#endif
/* Syscalls to permit */
#ifdef __NR_brk
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