Set SA_RESTART on non-lethal signals (REQ_INFO, FLUSH_PCAP) to avoid corrupting binary pcap output

backport-0090-Set-SA_RESTART-non-lethal-signals-avoid-corrupting-binary-pcap-output.patch

@@ -0,0 +1,33 @@
+From 8a28e07f3bfd2a031491db55173370e10dc074e3 Mon Sep 17 00:00:00 2001
+From: Alexandre Ferrieux <alexandre.ferrieux@orange.com>
+Date: Sat, 16 Jul 2022 21:34:39 +0200
+Subject: [PATCH] Set SA_RESTART on non-lethal signals (REQ_INFO, FLUSH_PCAP)
+ to avoid corrupting binary pcap output
+
+---
+ tcpdump.c | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/tcpdump.c b/tcpdump.c
+index e028d2e7..515edf5d 100644
+--- a/tcpdump.c
++++ b/tcpdump.c
+@@ -2743,7 +2743,14 @@ static void
+ 
+ 	memset(&new, 0, sizeof(new));
+ 	new.sa_handler = func;
+-	if (sig == SIGCHLD)
++	if ((sig == SIGCHLD)
++# ifdef SIGNAL_REQ_INFO
++		|| (sig == SIGNAL_REQ_INFO)
++# endif
++# ifdef SIGNAL_FLUSH_PCAP
++		|| (sig == SIGNAL_FLUSH_PCAP)
++# endif
++		)
+ 		new.sa_flags = SA_RESTART;
+ 	if (sigaction(sig, &new, &old) < 0)
+ 		return (SIG_ERR);
+-- 
+2.25.1
+

tcpdump.spec

@@ -1,7 +1,7 @@
 Name:           tcpdump
 Epoch:          14
 Version:        4.99.1
-Release:        2
+Release:        3
 Summary:        A network traffic monitoring tool
 License:        BSD with advertising
 URL:            http://www.tcpdump.org
@@ -14,6 +14,7 @@ Patch0:         backport-0002-Use-getnameinfo-instead-of-gethostbyaddr.patch
 Patch1:         backport-0003-Drop-root-priviledges-before-opening-first-savefile-.patch
 Patch2:         backport-0007-Introduce-nn-option.patch
 Patch3:         backport-0009-Change-n-flag-to-nn-in-TESTonce.patch
+Patch4:         backport-0090-Set-SA_RESTART-non-lethal-signals-avoid-corrupting-binary-pcap-output.patch
 
 Requires(pre):  shadow-utils
 BuildRequires:  automake openssl-devel libpcap-devel git-core gcc
@@ -87,6 +88,12 @@ make check
 %{_mandir}/man8/tcpdump.8*
 
 %changelog
+* Wed Aug 17 2022 zhangqiang <zhangqiang@kylinos.cn> - 14:4.99.1-3
+- Type:bugfix
+- CVE:NA
+- SUG:NA
+- DESC:Set SA_RESTART on non-lethal signals (REQ_INFO, FLUSH_PCAP) to avoid corrupting binary pcap output
+
 * Sat Jun 11 2022 gaihuiying <eaglegai@163.com> - 4.99.1-2
 - Type:bugfix
 - CVE:NA