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The do_check() function recently gained some defenses against symlink
replacement attacks that involve the use of *at functions in place of
their vanilla counterparts; openat() instead of open(), for example.
One opportunity to replace mkdir() with mkdirat() was missed, however,
and this commit replaces it.
This fixes #386.
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--user that start with a number
start-stop-daemon and supervise-daemon parse usernames and group names
passed via the --user argument as numeric UID/GID if they start with a
number (e.g. user "4foo" will be treated as UID 4). This results in the
process that is being started to run under a totally unexpected user if
that UID exists.
Even though the result of the sscanf calls are tested for a result of
exactly 1, which means exactly one value was extracted, because sscanf's
format string only contains only one placeholder, it will never return
a value greater than 1, even if there are still characters left to be
parsed. This causes start-stop-daemon and supervise-daemon to assume
that usernames starting with a number are just that number. Adding a
second placeholder "%1s" to the format string, which matches a string of
length 1, makes sure that sscanf can distinguish between pure numbers
(in which case it will return 1) and strings either starting with a
number (in which case it will return 2) and any other string (in which
case it will return 0).
This fixes #379.
This fixes #380.
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Starting program: /sbin/start-stop-daemon --start --exec i-dont-exist
Program received signal SIGSEGV, Segmentation fault.
0x0000555555559053 in main (argc=1, argv=0x7fffffffdc20)
at start-stop-daemon.c:631
631 *exec_file ? exec_file : exec);
This fixes #385.
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This walks the directory path to the file we are going to manipulate to make
sure that when we create the file and change the ownership and permissions
we are working on the same file.
Also, all non-terminal symbolic links must be owned by root. This will
keep a non-root user from making a symbolic link as described in the
bug. If root creates the symbolic link, it is assumed to be trusted.
On non-linux platforms, we no longer follow non-terminal symbolic links
by default. If you need to do that, add the -s option on the checkpath
command line, but keep in mind that this is not secure.
This fixes #201.
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On gcc-10 (and gcc-9 -fno-common) build fails as:
```
cc -L../librc -L../libeinfo -O2 -g -std=c99 -Wall -Wextra -Wimplicit -Wshadow \
-Wformat=2 -Wmissing-prototypes -Wmissing-declarations -Wmissing-noreturn \
-Wmissing-format-attribute -Wnested-externs -Winline -Wwrite-strings \
-Wcast-align -Wcast-qual -Wpointer-arith -Wdeclaration-after-statement \
-Wsequence-point -Werror=implicit-function-declaration \
-Wl,-rpath=/lib -o openrc rc.o rc-logger.o rc-misc.o rc-plugin.o _usage.o -lutil -lrc -leinfo -Wl,-Bdynamic -ldl
ld: rc-logger.o:/home/slyfox/dev/git/openrc/src/rc/rc-logger.h:16:
multiple definition of `rc_logger_pid'; rc.o:openrc/src/rc/rc-logger.h:16: first defined here
ld: rc-logger.o:/home/slyfox/dev/git/openrc/src/rc/rc-logger.h:17:
multiple definition of `rc_logger_tty'; rc.o:openrc/src/rc/rc-logger.h:17: first defined here
```
gcc-10 will change the default from -fcommon to fno-common:
https://gcc.gnu.org/PR85678.
The error also happens if CFLAGS=-fno-common passed explicitly.
This fixes #348.
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When executable is provided just by name (and therefore searched in a
path), exec_file is reset to NULL every time. exists() handles it being
NULL just fine, but dereferencing it in eerror does not work.
Fixes #326
Fixes #327
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This allows openrc to direct sysvinit to shut down the system by setting
the INIT_HALT environment variable appropriately. Also, we do not try to
communicate with sysvinit if its fifo does not exist.
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This fixes #315.
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This fixes #313.
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The do_openrc() function was not waiting properly for the child process
which started the runlevel to return. We need to repeatedly call
waitpid() until its return value matches the pid of the child process or
the child process does not exist.
This fixes #216.
This fixes #300.
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The -f option can be used when showing the status of services in
runlevels to allow making the output more easily parsable.
Currently, the .ini format is the only one supported.
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This fixes #290.
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Clean up code indented with mixed tabs and spaces.
No actual code changes.
This fixes #280.
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readlink(3) does not nul-terminate the result it sticks
into the supplied buffer. Consequently, the code
rc = readlink(path, buf, sizeof(buf));
does not necessarily produce a C string.
The code in rc_find_pid() produces some C strings this way
and passes them to strlen() and strcmp(), which can lead
to an out-of-bounds read.
In this case, since the code already takes care to
zero-initialize the buffers before passing them
to readlink(3), only allow sizeof(buf)-1 bytes to
be returned.
(While fixing this issue, I fixed two other locations that
used the same problematic pattern.)
This fixes #270.
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These are not standard.
For more information see issue #279.
This fixes #279.
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Fix misleading indentation and other erroneous whitespace.
This fixes #273.
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The following will cause a segfault due to NULL being
passed to strcmp(3)
$ RC_SVCNAME=foo supervise-daemon
Fix the bounds check on argc in main. If argc<=1, then
it is not safe to dereference argv[1].
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The statement
ll = strlen(applet);
appears twice in the same block without any
intervening assignment to the variables
'll' or 'applet'
Remove the second (duplicate) statement.
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In order to run healthcheck() and the unhealthy() function, add an
exec_command call to the supervisor.
Another difference is This function also logs errors instead of
attempting to display them.
This is for #271.
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This will make it easier to track down why the supervisor intermittently
hangs after it runs for a long time.
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This fixes #264.
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This fixes #239.
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This is for #263.
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Since the pid file is internal to us, start moving toward deprecating it
by not requiring the user to specify it.
In the next release, I plan on working on code to start phasing out the
use of a pid file if this is possible.
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This will allow us to signal the daemon we are supervising as well as
send other commands to the supervisor in the future.
This fixes #227.
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This is needed in preparation for adding support for a fifo to allow us
to communicate with the supervisor to ask it to signal the child it is
supervising.
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This reverts commit 2af0cedd5952d7da71681b7a636dff3540e4295d.
After speaking with Luis Ressel on the Gentoo selinux team, I am reverting
this commit for the following reasons:
- Luis told me that he feels this is not the solution we need to address
the concern with checkpath; I will be working with him on another
solution.
- There are concerns about the way the path variable was handled
and the assert() call.
The path variable should be dynamically allocated using xasprintf
instead of defining a length at compile time. This would eliminate the
need for the assert() call.
- It introduces the definition of _GNU_SOURCE which makes it
easier to introduce portability concerns in the future (see #262).
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This avoids opening directories/files with read permission, which is
sometimes rejected by selinux policy.
Bug: https://bugs.gentoo.org/667122
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The pidfile of the supervisor doesn't need to be adjustable by the
service script. It is only used so the supervisor can stop itself when
the --stop option is used.
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In start-stop-daemon and rc-schedules, we were printing out a warning if
the nanosleep call was interrupted by a signal, but we did not treat
this as an error situation other than displaying the message, so there
is no need for the message.
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We need to make sure to reap zombies so that we can shut down
successfully.
Fixes #252.
Possibly related to #250.
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