dhcpcd: fix SECCOMP for i386

The dhcpcd doesn't work on Intel 32bit platform. Backport a patch to fix
the issue.

(From OE-Core rev: e8b03a8e3a6748374340d45ce39e922eee6817e3)

Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 57 insertions, 0 deletions

diff --git a/meta/recipes-connectivity/dhcpcd/files/0001-privsep-Fix-Linux-i386-for-SECCOMP-as-it-just-uses-s.patch b/meta/recipes-connectivity/dhcpcd/files/0001-privsep-Fix-Linux-i386-for-SECCOMP-as-it-just-uses-s.patch
new file mode 100644
index 0000000000..b79d5f04ce
--- /dev/null
+++ b/meta/recipes-connectivity/dhcpcd/files/0001-privsep-Fix-Linux-i386-for-SECCOMP-as-it-just-uses-s.patch
@@ -0,0 +1,57 @@
+From 12cdb2be46e25e1ab99df18324b787ad8749dff7 Mon Sep 17 00:00:00 2001
+From: Roy Marples <roy@marples.name>
+Date: Sat, 12 Dec 2020 22:12:54 +0000
+Subject: [PATCH] privsep: Fix Linux i386 for SECCOMP as it just uses
+ socketcall
+
+Rather than accept(2), recv(2), etc..... which is horrible!
+
+Thanks to Steve Hirsch <stevehirsch49@msn.com> for testing.
+
+Upstream-Status: Backport
+[https://roy.marples.name/cgit/dhcpcd.git/commit/?id=12cdb2be46e25e1ab99df18324b787ad8749dff7]
+
+Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
+---
+ src/privsep-linux.c | 18 ++++++++++++++++++
+ 1 file changed, 18 insertions(+)
+
+diff --git a/src/privsep-linux.c b/src/privsep-linux.c
+index 050a30cf..d31d720d 100644
+--- a/src/privsep-linux.c
++++ b/src/privsep-linux.c
+@@ -34,6 +34,7 @@
+ 
+ #include <linux/audit.h>
+ #include <linux/filter.h>
++#include <linux/net.h>
+ #include <linux/seccomp.h>
+ #include <linux/sockios.h>
+ 
+@@ -311,6 +312,23 @@ static struct sock_filter ps_seccomp_filter[] = {
+ #ifdef __NR_sendto
+        SECCOMP_ALLOW(__NR_sendto),
+ #endif
++#ifdef __NR_socketcall
++       /* i386 needs this and demonstrates why SECCOMP
++        * is poor compared to OpenBSD pledge(2) and FreeBSD capsicum(4)
++        * as this is soooo tied to the kernel API which changes per arch
++        * and likely libc as well. */
++       SECCOMP_ALLOW_ARG(__NR_socketcall, 0, SYS_ACCEPT),
++       SECCOMP_ALLOW_ARG(__NR_socketcall, 0, SYS_ACCEPT4),
++       SECCOMP_ALLOW_ARG(__NR_socketcall, 0, SYS_LISTEN),
++       SECCOMP_ALLOW_ARG(__NR_socketcall, 0, SYS_GETSOCKOPT),  /* overflow */
++       SECCOMP_ALLOW_ARG(__NR_socketcall, 0, SYS_RECV),
++       SECCOMP_ALLOW_ARG(__NR_socketcall, 0, SYS_RECVFROM),
++       SECCOMP_ALLOW_ARG(__NR_socketcall, 0, SYS_RECVMSG),
++       SECCOMP_ALLOW_ARG(__NR_socketcall, 0, SYS_SEND),
++       SECCOMP_ALLOW_ARG(__NR_socketcall, 0, SYS_SENDMSG),
++       SECCOMP_ALLOW_ARG(__NR_socketcall, 0, SYS_SENDTO),
++       SECCOMP_ALLOW_ARG(__NR_socketcall, 0, SYS_SHUTDOWN),
++#endif
+ #ifdef __NR_shutdown
+        SECCOMP_ALLOW(__NR_shutdown),
+ #endif
+-- 
+2.25.1
+