similar to: SIGCHLD race condition?

Yes, this is a patch against an older version of OpenSSH with other stuff anyways, BUT, it's so TRIVIAL(*), that you can see how it would apply to newer versions (which I've not tried). Here's the gist: server_loop2() has a race condition with respect to reception of SIGCHLD and checking/setting child_terminated. This patch does two things: wait_until_can_do_something() adds a 1

comments? alternatives: sigsetjmp(ugly) and pselect(not portable, available) drawback: additional filedescriptors. Index: serverloop.c =================================================================== RCS file: /home/markus/cvs/ssh/serverloop.c,v retrieving revision 1.82 diff -u -r1.82 serverloop.c --- serverloop.c 10 Oct 2001 22:18:47 -0000 1.82 +++ serverloop.c 11 Oct 2001 18:06:33 -0000 @@

Can anyone offer any advice on this issue? We've tried patching sshd to have a maximum 10 second timeout when calling select() in serverloop.c, and this doesn't appear to have had any ill effects. Thanks, Paul ------- Forwarded Message Date: Tue, 18 Sep 2001 16:49:40 -0700 From: Paul Menage <pmenage at ensim.com> To: mouring at etoh.eviladmin.org cc: Paul Menage

HP-UX 11 is looping on SIGCHLD/sigchld_handler2() when exiting a protocol 2 session apparently because we don't call wait before reinstalling the handler. Any thoughts on this issue or how to address it? serverloop.c from latest snapshots: void sigchld_handler2(int sig) { int save_errno = errno; debug("Received SIGCHLD."); child_terminated = 1; signal(SIGCHLD,

Greetings, I have a problem with OpenSSH -current and SCO 3.2v4.2, when I execute a remote command or exit from a session, the connection hangs, ( line 326 of serverloop.c). This problem only exists when using ssh2. server side debug (-d -d -d ): debug1: Received SIGCHLD. debug2: channel 0: read failed debug2: channel 0: close_read debug2: channel 0: input open -> drain debug2: channel 0:

http://bugzilla.mindrot.org/show_bug.cgi?id=79 Summary: A race with select() in SIGCHLD handling causes hangs occasionally Product: Portable OpenSSH Version: 3.0.2p1 Platform: All URL: http://marc.theaimsgroup.com/?l=openssh-unix- dev&m=100454673601558&w=2 OS/Version: All

Here are some patches to re-enable support for AIX's authenticate routines. With them, ssh will honor locked & unlocked accounts, record successful and unsuccessful logins, and deny accounts that are prohibited to log in via the network. Tested with AIX 4.3. It also includes a fix for handling SIGCHLD that may be needed for other platforms (HP-UX 10.20, for example). If I get the time

using openssh-3.8.1p1 from sunfreeware.com on a SunOS XXX 5.8 Generic_117000-03 sun4u sparc SUNW,Sun-Fire-V240. sshd seems to ignore or miss SIGCLD. this is a rare behaviour we observe about once per week in a ssh intensive environment. the process hangs here: truss: 24453: poll(0xFFBEEF28, 2, -1) (sleeping...) gcore, mdb: libc.so.1`_poll+4(b, 0, 0, ffbeef38, 6fc40,

On 2.3.0p1, we have been experiencing the SSH2 stdout truncation problem that was reported by a few users. I built the 20010115 snapshot. It seems to correct the problem but before I was able to test it, I had to change sigchld_handler2 so it would not reset the signal handler before waitpid is called. On Irix, it seems a SIGCHLD is delivered for ever... I haven't tried the last snapshots so

http://bugzilla.mindrot.org/show_bug.cgi?id=651 Summary: SCO 3.2v4.2 and OpenSSH 3.7.1p1 --> connection hangs and does not close (ssh2 only) Product: Portable OpenSSH Version: 3.7p1 Platform: All OS/Version: other Status: NEW Severity: major Priority: P2 Component: sshd

This patch is against Cray patch against openssh-SNAP-20010710. Here a few notes about them: 1) rijndael does not work on cray due to the fact it is rooted in 32 bits. I looking for a fix, it may come form Wendy Palam. For now the cray default to the following cihpers for ssh version 2 ssh are: 3des-cbc,blowfish-cbc,cast128-cbc,arcfour 2) Crays don't have setitimer so I

I recently started building a simulator using honeyd as an IP emulator and experienced an issue with hangs on exit from ssh and sftp sessions. A quick look at the OpenSSH source code revealed the following: In serverloop.c there is a signal handler defined for SIGCHLD as follows: static void sigchld_handler(int sig) { int save_errno = errno; debug("Received SIGCHLD.");

http://bugzilla.mindrot.org/show_bug.cgi?id=52 dtucker at zip.com.au changed: What |Removed |Added ---------------------------------------------------------------------------- OtherBugsDependingO| |1274 nThis| | ------- You are receiving this mail because: ------- You are the assignee for

Rsync maintainers please review rsync bug https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=98740 The code in question is in socket.c in start_accept_loop. The user is getting these warning messages:

http://bugzilla.mindrot.org/show_bug.cgi?id=52 dtucker at zip.com.au changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment #1075 is|0 |1 obsolete| | Attachment #1098 is|0 |1 obsolete|

Hi OpenSSH developers, I am using openSSH (now 2.9.9p2, but prob occurs in 2.9p2 also) to execute commands on a remote machine which outputs data to stdout then pipes it to another invocation of ssh which connects back to the first machine in the same way, where it starts a program to read and store the output from the command on the second machine. I am using the "command" option in

Hi What if you have sysv signals (i.e. signal is restored when handler is called) and child process exits here? Zombie will be left, because SIGCHLD is ignored at that point. Shouldn't signal be before waitpid? Mikulas static void main_sigchld_handler(int sig) { int save_errno = errno; pid_t pid; int status; while ((pid = waitpid(-1, &status, WNOHANG))

Hello, I've been trying to get openssh working at our site recently, but have been running into these problems. In using the "release" version (openssh-2.3.0p1) we kept getting these broken pipe errors: zcat: stdout: Broken pipe Damien suggested we try out the snapshot versions, so I've been trying out the daily versions since last week. With the snapshots, the pipe problem

Hello, In response to the timing analysis attacks presented by Dawn Song et. al. in her paper http://paris.cs.berkeley.edu/~dawnsong/ssh-timing.html we at Silicon Defense developed a patch for openssh to avoid such measures. Timing Analysis Evasion changes were developed by C. Jason Coit and Roel Jonkman of Silicon Defense. These changes cause SSH to send packets unless request not to,

Peter Dimitrov and myself were debugging a very peculiar bug when libguestfs is run as a plugin from collectd: https://www.redhat.com/archives/libguestfs/2018-November/thread.html#00023 The long story short is that collectd leaks SIGCHLD == SIG_IGN setting into plugins: https://www.redhat.com/archives/libguestfs/2018-November/msg00095.html This means that any plugin that does the usual