fix undefined behavior in scmp_bpf_sim.c causing issues when building with clang

Signed-off-by: jchzhou <zhoujiacheng@iscas.ac.cn>
(cherry picked from commit e258642b09c628e0fe81795bf579905504edf8cf)

fix_undefined_behavior_in_scmp_bpf_sim.patch

@@ -0,0 +1,25 @@
+From 3292da1d4dafab2d18c7b750fa278bcc8a362d04 Mon Sep 17 00:00:00 2001
+From: q66 <q66@chimera-linux.org>
+Date: Wed, 20 Dec 2023 04:01:42 +0100
+Subject: [PATCH] fix UB-ass UB in scmp_bpf_sim
+
+---
+ tools/scmp_bpf_sim.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/tools/scmp_bpf_sim.c b/tools/scmp_bpf_sim.c
+index a381314..eeaa5bc 100644
+--- a/tools/scmp_bpf_sim.c
++++ b/tools/scmp_bpf_sim.c
+@@ -182,7 +182,8 @@ static void bpf_execute(const struct bpf_program *prg,
+ 		switch (code) {
+ 		case BPF_LD+BPF_W+BPF_ABS:
+ 			if (k < BPF_SYSCALL_MAX) {
+-				uint32_t val = *((uint32_t *)&sys_data_b[k]);
++				uint32_t val;
++				memcpy(&val, &sys_data_b[k], sizeof(val));
+ 				state.acc = ttoh32(arch, val);
+ 			} else
+ 				exit_error(ERANGE, ip_c);
+-- 
+2.43.0

libseccomp.spec

@@ -1,6 +1,6 @@
 Name:		libseccomp
 Version:	2.5.4
-Release:        2
+Release:        3
 Summary:	Interface to the syscall filtering mechanism
 License:	LGPLv2
 URL:		https://github.com/seccomp/libseccomp
@@ -9,6 +9,8 @@ Source0:	https://github.com/seccomp/libseccomp/releases/download/v%{version}/%{n
 Patch2:         backport-arch-disambiguate-in-arch-syscall-validate.patch
 Patch3:         Add-64-bit-LoongArch-support.patch
 Patch4:         fix-build-error-for-libseccomp.patch
+# https://github.com/chimera-linux/cports/pull/1099
+Patch5:         fix_undefined_behavior_in_scmp_bpf_sim.patch
 
 BuildRequires:	gcc gperf autoconf automake
 
@@ -79,6 +81,9 @@ make check
 %{_mandir}/man*/*
 
 %changelog
+* Fri May 10 2024 jchzhou <zhoujiacheng@iscas.ac.cn> - 2.5.4-3
+- fix undefined behavior in scmp_bpf_sim.c causing issues when building with clang
+
 * Mon Jul 31 2023 Jingyun Hua<huajingyun@loongson.cn> - 2.5.4-2
 - add loongarch64 support for libseccomp