NetBSD Problem Report #50248

From www@NetBSD.org  Tue Sep 15 08:28:39 2015
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Message-Id: <20150915082837.125F1A65B8@mollari.NetBSD.org>
Date: Tue, 15 Sep 2015 08:28:37 +0000 (UTC)
From: nonakap@gmail.com
Reply-To: nonakap@gmail.com
To: gnats-bugs@NetBSD.org
Subject: tcpdump -w don't work.
X-Send-Pr-Version: www-1.0

>Number:         50248
>Category:       bin
>Synopsis:       tcpdump -w don't work.
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    bin-bug-people
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Sep 15 08:30:00 +0000 2015
>Closed-Date:    Thu Sep 17 14:13:07 +0000 2015
>Last-Modified:  Thu Sep 17 14:13:07 +0000 2015
>Originator:     NONAKA Kimihiro
>Release:        HEAD 20150915
>Organization:
>Environment:
NetBSD netbsd 7.99.21 NetBSD 7.99.21 (KOHARU) #41: Tue Sep 15 12:08:42 JST 2015  nonaka@netbsd:/home/snapshot/NetBSD/HEAD.20150827/obj.NetBSD-amd64/amd64/sys/arch/amd64/compile/KOHARU amd64
>Description:
# tcpdump -w xxx.pcap
tcpdump: xxx.pcap: Permission denied
# tcpdump -w ~/xxx.pcap
tcpdump: /home/nonaka/xxx.pcap: No such file or directory

Failed to open the xxx.pcap file because try it after chroot(2).

>How-To-Repeat:
tcpdump -w xxx.pcap
>Fix:
Re-apply src/external/bsd/tcpdump/dist/tcpdump.c rev.1.8.

diff --git a/external/bsd/tcpdump/dist/tcpdump.c b/external/bsd/tcpdump/dist/tcpdump.c
index 2555495..009f294 100644
--- a/external/bsd/tcpdump/dist/tcpdump.c
+++ b/external/bsd/tcpdump/dist/tcpdump.c
@@ -1857,6 +1857,9 @@ main(int argc, char **argv)
 		capng_apply(CAPNG_SELECT_BOTH);
 #endif /* HAVE_LIBCAP_NG */
 		if (username || chroot_dir)
+#ifndef HAVE_LIBCAP_NG
+			if (!WFileName)
+#endif
 			droproot(username, chroot_dir);
 	}
 #endif /* WIN32 */

>Release-Note:

>Audit-Trail:
From: "NONAKA Kimihiro" <nonaka@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/50248 CVS commit: src/external/bsd/tcpdump/dist
Date: Thu, 17 Sep 2015 14:03:10 +0000

 Module Name:	src
 Committed By:	nonaka
 Date:		Thu Sep 17 14:03:10 UTC 2015

 Modified Files:
 	src/external/bsd/tcpdump/dist: tcpdump.c

 Log Message:
 PR/50248: re-apply src/external/bsd/tcpdump/dist/tcpdump.c rev.1.8.

 > When running as root and wanting to write a file and not having CAPNG, don't
 > drop privs, because we cannot open the file if we drop privs.


 To generate a diff of this commit:
 cvs rdiff -u -r1.11 -r1.12 src/external/bsd/tcpdump/dist/tcpdump.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

State-Changed-From-To: open->closed
State-Changed-By: nonaka@NetBSD.org
State-Changed-When: Thu, 17 Sep 2015 14:13:07 +0000
State-Changed-Why:
Applied src/external/bsd/tcpdump/dist/tcpdump.c rev.1.8.


>Unformatted:

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