Deny (non-fatal) ipc in preauth privsep child.

As noted in openssh/openssh-portable#149, i386 does not have have
_NR_shmget etc.  Instead, it has a single ipc syscall (see man 2 ipc,
https://linux.die.net/man/2/ipc).  Add this syscall, if present, to the
list of syscalls that seccomp will deny non-fatally.

Bug-Debian: https://bugs.debian.org/946242
Origin: upstream, https://anongit.mindrot.org/openssh.git/commit/?id=30f704ebc0e9e32b3d12f5d9e8c1b705fdde2c89
Last-Update: 2020-01-11

Patch-Name: sandbox-seccomp-ipc.patch

1 files changed, 3 insertions, 0 deletions

diff --git a/sandbox-seccomp-filter.c b/sandbox-seccomp-filter.c
index 999c46c9f..0914e48ba 100644
--- a/sandbox-seccomp-filter.c
+++ b/sandbox-seccomp-filter.c
@@ -177,6 +177,9 @@ static const struct sock_filter preauth_insns[] = {
 #ifdef __NR_shmdt
         SC_DENY(__NR_shmdt, EACCES),
 #endif
+#ifdef __NR_ipc
+        SC_DENY(__NR_ipc, EACCES),
+#endif
 
         /* Syscalls to permit */
 #ifdef __NR_brk