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From scan-build w/ clang-16.0.0_pre20230107:
```
../src/librc/librc.c:759:14: warning: Potential leak of memory pointed to by 'init' [unix.Malloc]
return false;
^~~~~
```
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It's already initialised to false at the start and it's clear when reading
what the flow is.
While at it, fix some indentation and adjust whitespace to make more readable.
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This one is a bit odd, it didn't get fixed in e273b4e08ee0ebc1a001d60e2a5b65a9553a8a8a,
and goes all the way back to cb9da6a262b60255cd037f20b4cde3ab2c8a1e6a.
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These become fine with C23 because () starts to mean (void) then, but for
previous language versions, it's deprecated, and it causes an annoying
warning when building with Clang by default.
Plus, GCC lacks specific flags to trigger what C23 *does* ban, so a lot
of people are going around building with -Wstrict-prototypes, so let's
just fix this to be consistent with the rest of the codebase anyway
to fend off false positive reports.
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On systems with a very large RLIMIT_NOFILE, calling close() in a loop
from 3 to getdtablesize() effects an enormous number of system calls.
There are better alternatives. Both BSD and Linux have the closefrom()
system call that closes all file descriptors with indices not less than
a specified minimum. Have start-stop-daemon call closefrom() on systems
where it's implemented, falling back to the old loop elsewhere.
Likewise, calling fcntl(i, F_SETFD, FD_CLOEXEC) in a loop from 3 to
getdtablesize() raises a similar performance concern. Linux 5.11 and
onward has a close_range() system call with a CLOSE_RANGE_CLOEXEC flag
that sets the FD_CLOEXEC flag on all file descriptors in a specified
range. Have supervise-daemon utilize this feature on systems where it's
implemented, falling back to the old loop elsewhere.
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1364e6631c7f266484981d88be43f9b039f76b6a exempted the write end of the
synchronization pipe from the close() loop in the child process, but
this is unnecessary, as the pipe is opened with O_CLOEXEC, and the child
process calls execvp() soon after the close() loop, with the intervening
code not needing the pipe. Indeed, the pipe only needs to remain open in
the child process until after the call to setsid(), which occurs well
before the close() loop. So, eliminate the needless carve-out from the
close() loop, in preparation for introducing closefrom().
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We incorrectly masked out the upper 3 bits when checking to see if the
permissions need updating leading us to run chmod when not needed.
Fixes #482.
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Fixes #491.
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dirfd is uninitialized at this point, and even if it were, it doesn't
make sense to use since the path is "/" -- the dirfd is ignored when
the path is absolute. Switch to AT_FDCWD to avoid all that.
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This fixes #557.
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Despite this being a 'deptree', it's actually
xmalloc'd in the same function (rc_deptree_update),
and so should be free'd, not rc_deptree_free'd,
as rc_deptree_load* wasn't used to allocate it.
```
[71/213] Compiling C object src/librc/librc.so.1.p/librc-depend.c.o
../src/librc/librc-depend.c: In function ‘rc_deptree_update’:
../src/librc/librc-depend.c:1077:9: warning: ‘rc_deptree_free’ called on pointer returned from a mismatched allocation function [-Wmismatched-dealloc]
1077 | rc_deptree_free(deptree);
| ^~~~~~~~~~~~~~~~~~~~~~~~
In file included from ../src/shared/misc.h:29,
from ../src/librc/librc.h:57,
from ../src/librc/librc-depend.c:21:
In function ‘xmalloc’,
inlined from ‘rc_deptree_update’ at ../src/librc/librc-depend.c:775:12:
../src/shared/helpers.h:64:23: note: returned from ‘malloc’
64 | void *value = malloc(size);
| ^~~~~~~~~~~~
```
This fixes #563.
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As described in "Why nice levels are a placebo and have been for a very
long time, and no one seems to have noticed"[1], the Linux kernel in its
default configuration on many Linux distributions autogroups tasks by
session ID and "fairly" allocates CPU time among such autogroups. The
nice levels of tasks within each autogroup are only relative to
other tasks within the same autogroup. Effectively, this means that the
traditional nice level is rendered moot for tools like start-stop-daemon
and supervise-daemon, which start each daemon in its own session and
thus in its own autogroup. Linux does provide a means to change the
niceness of autogroups relative to each other, so let's have start-stop-
daemon and supervise-daemon make use of this feature where available so
that -N,--nicelevel/SSD_NICELEVEL will actually do what the user
intends. On systems where autogroups are not supported or are disabled,
this commit introduces no change in behavior.
Note that the setsid() call in the child process of start-stop-daemon is
moved to much earlier. This is necessary so that the new process will be
assigned to a new autogroup before the autogroup nicelevel is set. To
avoid inadvertently acquiring /dev/tty as the controlling terminal of
the new session after setsid() has given up the controlling terminal
inherited from the parent process, tty_fd is opened before the call to
setsid().
[1] https://www.reddit.com/r/linux/comments/d7hx2c/why_nice_levels_are_a_placebo_and_have_been_for_a/
This fixes #542.
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This is broken, so revert it and reopen #532.
This reverts commit 9e5ce59a21ed19a3829bae0b27d957c5fd0de74f.
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While running `rc-service start docker` on Gentoo,
I found that the command does not start the service 90% of the time,
with an enigmatic 'service crashed' message.
The root cause of this is apparently rc-service spawning a pty,
running start-stop-daemon inside that pty, and exitting,
before start-stop-daemon child process calls setsid(),
which results in the child process being killed with SIGHUP (SI_KERNEL).
Theoretically this bug was present ever since the file was created in
5af58b45146a ("Rewrite the core parts in C. We now provide...")
(or even before that), but it should have been only a minor issue before
45bd125dccdc ("Use a pty for prefixed output instead of pipes for...").
Not sure why nobody has had the issue so far (it has been present for
almost 15 years).
As here setsid() is the last call before execve(), the most natural
locking mechanism is vfork(), as it gives back control to parent
process only after execve() or process termination.
So this way the bug can be fixed by adding a single letter. :-)
Another way to ensure this would be using an O_CLOEXEC file descriptor
or some custom lock, which would need to be released not before setsid().
Fixes: 5af58b45146a ("Rewrite the core parts in C. We now provide...")
Fixes #532.
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The two lines seem to both belong to --override, but made into seperate
array elements accidentally, making options after --override and their
help mismatch. This fixes it.
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Signed-off-by: Sam James <sam@gentoo.org>
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```
=================================================================
==22862==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 4096 byte(s) in 1 object(s) allocated from:
#0 0x7f1fd5b12cb7 in __interceptor_malloc /usr/src/debug/sys-devel/gcc-11.2.1_p20220312/gcc-11-20220312/libsanitizer/asan/asan_malloc_linux.cpp:145
#1 0x55556abecea7 in xmalloc ../src/includes/helpers.h:64
#2 0x55556abecea7 in xasprintf ../src/includes/helpers.h:149
#3 0x55556abeb6fb in do_check ../src/rc/checkpath.c:206
#4 0x55556abeb6fb in main ../src/rc/checkpath.c:443
#5 0x7f1fd58576cf in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
SUMMARY: AddressSanitizer: 4096 byte(s) leaked in 1 allocation(s).
```
Signed-off-by: Sam James <sam@gentoo.org>
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```
Direct leak of 4 byte(s) in 1 object(s) allocated from:
#0 0x7f49539534a7 in __interceptor_strdup /usr/src/debug/sys-devel/gcc-11.2.1_p20220312/gcc-11-20220312/libsanitizer/asan/asan_interceptors.cpp:454
#1 0x55d76fa66867 in xstrdup ../src/includes/helpers.h:91
#2 0x55d76fa66867 in get_dirfd ../src/rc/checkpath.c:111
#3 0x55d76fa66867 in do_check ../src/rc/checkpath.c:206
#4 0x55d76fa66867 in main ../src/rc/checkpath.c:442
#5 0x7f49536f06cf in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
```
Signed-off-by: Sam James <sam@gentoo.org>
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Signed-off-by: Sam James <sam@gentoo.org>
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Found by GCC 11's -fanalyzer.
Signed-off-by: Sam James <sam@gentoo.org>
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Signed-off-by: Sam James <sam@gentoo.org>
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Signed-off-by: Sam James <sam@gentoo.org>
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(This is analogous to the rc_stringlist change.)
This gives a hint to the compiler that allocations (return values)
from this function should be paired with a corresponding dealloc/free
function.
Signed-off-by: Sam James <sam@gentoo.org>
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Signed-off-by: Sam James <sam@gentoo.org>
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This gives a hint to the compiler that allocations (return values)
from this function should be paired with a corresponding dealloc/free
function
In this case, it means that every rc_stringlist that rc_stringlist_new()
returns should eventually be freed by calling rc_stringlist_free(ptr)
where ptr is the relevant rc_stringlist.
We have to add a test for this into the build system
because only GCC supports this for now. In future, we might
be able to use meson's has_function_attribute (it does support
'malloc', just not AFAICT 'malloc with arguments').
Signed-off-by: Sam James <sam@gentoo.org>
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Both 'pkg' and 'local' are referenced within list,
so we can't free them yet.
Signed-off-by: Sam James <sam@gentoo.org>
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'services' is still referenced by the list
which gets returned. We can't free it.
Thanks to GCC 11's -fanalyzer.
Signed-off-by: Sam James <sam@gentoo.org>
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Signed-off-by: Sam James <sam@gentoo.org>
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Seen on running rc-status.
```
=================================================================
==14636==ERROR: LeakSanitizer: detected memory leaks
Indirect leak of 72 byte(s) in 3 object(s) allocated from:
#0 0x7f443412dcb7 in __interceptor_malloc /usr/src/debug/sys-devel/gcc-11.2.1_p20220312/gcc-11-20220312/libsanitizer/asan/asan_malloc_linux.cpp:145
#1 0x7f443400c727 in xmalloc ../src/includes/helpers.h:64
#2 0x7f443400d1f4 in rc_stringlist_add ../src/librc/librc-stringlist.c:32
#3 0x7f4433fecc34 in get_runlevel_chain ../src/librc/librc.c:390
#4 0x7f4433fedc00 in rc_runlevel_stacks ../src/librc/librc.c:519
#5 0x7f4433ff1d8e in rc_services_in_runlevel_stacked ../src/librc/librc.c:976
#6 0x55be0e8f9517 in main ../src/rc/rc-status.c:407
#7 0x7f44334736cf in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
```
Signed-off-by: Sam James <sam@gentoo.org>
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This fixes #516.
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- drop initialization of some variables.
- use eerrorx where possible
- drop final cleanup instructions
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There have been a number of subtle improvements and cleanups to seedrng,
including using openat and locking the directory fd instead of a
separate lock file. Also various stylistic cleanups.
This fixes #519.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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- drop old build system
- move shared include and source files to common directory
- drop "rc-" prefix from shared include and source files
- move executable-specific code to individual directories under src
- adjust top-level .gitignore file for new build system
This closes #489.
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Now that we have the command line arguments, there's no need for the
environment variables.
This fixes #511.
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This fixes #508.
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This cleans up the exit path a little bit.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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The RNG can't actually be seeded from a shell script, due to the
reliance on ioctls. For this reason, the seedrng project provides a
basic script meant to be copy and pasted into projects like OpenRC and
tweaked as needed: https://git.zx2c4.com/seedrng/about/
This commit imports it into OpenRC and wires up /etc/init.d/urandom to
call it. It shouldn't be called by other things on the system, so it
lives in rc_sbindir.
Closes #506.
Closes #507.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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This should make the code easier to maintain without having to remember
what the exact 0x100 constant means.
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We use 0x100+ to avoid collisions in the 8 bit getopt interface, so
switch 0x80 to align with the other existing 0x100 options we have.
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This add No New Privs flag for start-stop-daemon and supervise-daemon
by adding --no-new-privs flag. As a result, the user set the No New
Privs flag for the program should run with.
see PR_SET_NO_NEW_PRIVS prctl(2)
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This adds securebits flags for start-stop-daemon and supervise-daemon
by adding --secbits option. As a result, the user can specify
securebits the program should run with. see capabilities(7)
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