https://bugzilla.mindrot.org/show_bug.cgi?id=2419
Bug ID: 2419
Summary: SECCOMP filter does not accept getpgid syscall
Product: Portable OpenSSH
Version: 6.8p1
Hardware: Other
OS: Linux
Status: NEW
Severity: enhancement
Priority: P5
Component: sshd
Assignee: [email protected]
Reporter: [email protected]
Based on question on serverfault [1] I found out that there is syscall
getpgid issued after LoginGraceTime. This doesn't show up when using
our packaged version of openssh, since the condition [2] is probably
optimized out by compiler (can't judge if the optimization is correct).
The solution is again white-list this syscall or optimize out this
condition as the compiler does it. I'm not sure if the condition has
some use here.
Backtrace from GDB (line numbers differ a bit from upstream sources):
#0 grace_alarm_handler (sig=14) at ../openssh-6.8p1/sshd.c:380
#1 <signal handler called>
#2 0xb7fd9be8 in ?? ()
#3 0x080baaef in ssh_dispatch_run (ssh=0x8153780, mode=0,
done=0x8151660, ctxt=0x8151660)
at ../openssh-6.8p1/dispatch.c:101
#4 0x080bac86 in ssh_dispatch_run_fatal (ssh=0x8153780, mode=0,
done=0x8151660, ctxt=0x8151660)
at ../openssh-6.8p1/dispatch.c:140
#5 0x08065103 in do_authentication2 (authctxt=0x8151660) at
../openssh-6.8p1/auth2.c:175
#6 0x08053cea in main (ac=4, av=0x814e3f8) at
../openssh-6.8p1/sshd.c:2314
[1]
http://serverfault.com/questions/697497/strange-seccomp-entries-for-sshd-in-audit-log/701889#701889
[2]
https://github.com/openssh/openssh-portable/blob/51a1c2115265c6e80ede8a5c9dccada9aeed7143/sshd.c#L368
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