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The unsupervised status is to be used when a supervisor of a supervised
service dies but leaves the service daemon itself running.
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This allows us to detect when the supervisor dies unexpectedly because
in that case child_pid will still exist.
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This allows the equivalent of "unsetting" a value for a service.
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X-Gentoo-Bug: 635334
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=635334
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X-Gentoo-Bug: 634634
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=634634
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- Harden against dying by handling all signals that would terminate the
program and adding --reexec support
- factor the supervisor into its own function
- fix test for whether we are already running
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Prior to this change, we were logging unexpected terminations of daemons
we were supervising at the info level. This change moves the logs to
warnings.
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The service binary was just a synonym for rc-service, so use rc-service
instead of service. If you want a "service" binary, it should be
something that can determine which service manager you are running and
run the appropriate service manager commands.
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We need to do this to skip the zombie state for the child process since
we are not easily able to wait() for it.
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Clean up the process for killing an active supervisor when stopping.
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This is for #163.
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rc-selinux.c: In function ‘selinux_setup’:
rc-selinux.c:361:9: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
curr_t = context_type_get(curr_con);
^
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The minimum requirement for libselinux is now >=2.6
The refpolicy and the gentoo policy contain the
contexts since version 2.20170204-r4
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This allows supervise-daemon to run this code without attempting to
print some status messages used by start-stop-daemon.
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The --retry option for supervise-daemon defines how the supervisor will
attempt to stop the child process it is monitoring. It is defined when
the supervisor is started since stopping the supervisor just sends a
signal to the active supervisor.
This fixes #160.
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This was part of start-stop-daemon; however, it needs to be shared in
order to be used by supervise-daemon.
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X-Gentoo-Bug: 624796
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=624796
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How to reproduce 1-byte overflow:
```
$ FEATURES=-test CFLAGS="-fsanitize=address -O0 -ggdb3" emerge -1 openrc
=================================================================
==1==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff0efd8710
at pc 0x000000402076 bp 0x7fff0efd7d50 sp 0x7fff0efd7d40
WRITE of size 1 at 0x7fff0efd8710 thread T0
#0 0x402075 (/sbin/openrc-init+0x402075)
#1 0x3cf6e2070f in __libc_start_main (/lib64/libc.so.6+0x3cf6e2070f)
#2 0x4013b8 (/sbin/openrc-init+0x4013b8)
Address 0x7fff0efd8710 is located in stack of thread T0 at offset 2432 in frame
#0 0x401cfb (/sbin/openrc-init+0x401cfb)
This frame has 3 object(s):
[32, 160) 'signals'
[192, 344) 'sa'
[384, 2432) 'buf' <== Memory access at offset 2432 overflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
(longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow ??:0 ??
```
The problem here is in the code handling reads from 'init.ctl':
```
int main(int argc, char **argv) {
...
char buf[2048];
for (;;) {
/* This will block until a command is sent down the pipe... */
fifo = fopen(RC_INIT_FIFO, "r");
count = fread(buf, 1, 2048, fifo);
buf[count] = 0;
...
}
```
`buf[count] = 0;` writes outside the buffer when `fread()` returns non-truncated read.
This fixes #138.
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Only close the log if we successfully opened it.
Reported-by: Brian Evans <grknight@gentoo.org>
Tested-by: Brian Evans <grknight@gentoo.org>
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
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To be more compatible with sysvinit, move to single user mode if no
options are specified on the command line.
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This is similar to the sysvinit killall5 utility. It should only be used
in service scripts, so it will not be installed in the path.
This closes #129.
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This will allow rc-status to display an uptime and restart count for
supervised processes.
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This creates --respawn-delay, --respawn-max and --respawn-period. It was
suggested that it would be easier to follow if the options were
separated.
This is for #126.
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Allow limiting the number of times supervise-daemon will attempt to respawn a
daemon once it has died to prevent infinite respawning. Also, set a
reasonable default limit (10 times in a 5 second period).
This is for issue #126.
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Both the child and supervisor need access to these file descriptors.
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