Date: Thu, 14 Sep 2023 23:54:33 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 273807] tcpdump is not able to set honor the timezone of the PC as set in /etc/localtime Message-ID: <bug-273807-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D273807 Bug ID: 273807 Summary: tcpdump is not able to set honor the timezone of the PC as set in /etc/localtime Product: Base System Version: 14.0-STABLE Hardware: amd64 OS: Any Status: New Severity: Affects Many People Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: mike@sentex.net Summary discussion here=20 https://lists.freebsd.org/archives/freebsd-stable/2023-September/001448.html AMD64 VM of FreeBSD 14 from Sept 1st. TCPDUMP (in the base and in the port= s) will not work properly when the timezone is set to something other than UTC= .=20 e.g. tcpdump -nei pflog0 will display log entries always in UTC, despite wh= at /etc/localtime is set to.=20 des@freebsd.org wrote in the email thread In stable/13, tcpdump reads /etc/localtime very early, and long before entering capability mode: 72111 tcpdump 0.007527 NAMI "/etc/localtime" 72111 tcpdump 0.007541 RET open 3 72111 tcpdump 0.007549 CALL read(0x3,0x1a9058bb78c0,0xd6b8) 72111 tcpdump 0.007627 RET read 2298/0x8fa 72111 tcpdump 0.007634 CALL close(0x3) 72111 tcpdump 0.007642 RET close 0 [...] 72111 tcpdump 0.024369 CALL cap_enter 72111 tcpdump 0.024381 RET cap_enter 0 In main and stable/14, it enters capability mode immediately before the first attempt to read /etc/localtime, which fails: 745 tcpdump 0.069967829 CALL cap_enter 745 tcpdump 0.070015646 RET cap_enter 0 745 tcpdump 0.070139522 CALL=20 fstatat(AT_FDCWD,0x1c377723d38e,0x1c3773430d00 ,0) 745 tcpdump 0.070196299 NAMI "/etc/localtime" 745 tcpdump 0.070240578 RET fstatat -1 errno 94 Not permitted in capability mode 745 tcpdump 0.070487574 CALL=20 fstatat(AT_FDCWD,0x1c377723d38e,0x1c3773430cd0,0) 745 tcpdump 0.070550458 NAMI "/etc/localtime" 745 tcpdump 0.070593003 RET fstatat -1 errno 94 Not permitted in capability mode The simplest workaround is to call tzset(3) before entering capability mode. --=20 You are receiving this mail because: You are the assignee for the bug.=
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