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eabdullin 2024-03-28 10:15:00 +00:00
parent c6452a9758
commit 4e806dc6d2
4 changed files with 1688 additions and 1 deletions
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391
SOURCES/2408.patch Normal file
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@ -0,0 +1,391 @@
From 0bbd63bf1945c6f3e1c88232521e1618c21d44f2 Mon Sep 17 00:00:00 2001
From: Philip Withnall <pwithnall@endlessos.org>
Date: Thu, 23 Dec 2021 17:45:51 +0000
Subject: [PATCH 1/4] gmain: Use waitid() on pidfds rather than a global
SIGCHLD handler
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
When the system supports it (as all Linux kernels ≥ 5.3 should), it’s
preferable to use `pidfd_open()` and `waitid()` to be notified of
child processes exiting or being signalled, rather than installing a
default `SIGCHLD` handler.
A default `SIGCHLD` handler is global, and can never interact well with
other code (from the application or other libraries) which also wants to
install a `SIGCHLD` handler.
This use of `pidfd_open()` is racy (the PID may be reused between
`g_child_watch_source_new()` being called and `pidfd_open()` being
called), so it doesn’t improve behaviour there. For that, we’d need
continuous use of pidfds throughout GLib, from fork/spawn time until
here. See #1866 for that.
The use of `waitid()` to get the process exit status could be expanded
in future to also work for stopped or continued processes (as per #175)
by adding `WSTOPPED | WCONTINUED` into the flags. That’s a behaviour
change which is outside the strict scope of adding pidfd support,
though.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Helps: #1866
Fixes: #2216
---
glib/gmain.c | 117 ++++++++++++++++++++++++++++++++++++++++++++++++---
meson.build | 14 ++++++
2 files changed, 125 insertions(+), 6 deletions(-)
diff --git a/glib/gmain.c b/glib/gmain.c
index 15581ee7a..e9965f7f6 100644
--- a/glib/gmain.c
+++ b/glib/gmain.c
@@ -67,6 +67,12 @@
#include <errno.h>
#include <string.h>
+#ifdef HAVE_PIDFD
+#include <sys/syscall.h>
+#include <sys/wait.h>
+#include <linux/wait.h> /* P_PIDFD */
+#endif /* HAVE_PIDFD */
+
#ifdef G_OS_WIN32
#define STRICT
#include <windows.h>
@@ -329,10 +335,11 @@ struct _GChildWatchSource
GSource source;
GPid pid;
gint child_status;
-#ifdef G_OS_WIN32
+ /* @poll is always used on Windows, and used on Unix iff @using_pidfd is set: */
GPollFD poll;
-#else /* G_OS_WIN32 */
- gboolean child_exited; /* (atomic) */
+#ifndef G_OS_WIN32
+ gboolean child_exited; /* (atomic); not used iff @using_pidfd is set */
+ gboolean using_pidfd;
#endif /* G_OS_WIN32 */
};
@@ -5325,7 +5332,8 @@ dispatch_unix_signals_unlocked (void)
{
GChildWatchSource *source = node->data;
- if (!g_atomic_int_get (&source->child_exited))
+ if (!source->using_pidfd &&
+ !g_atomic_int_get (&source->child_exited))
{
pid_t pid;
do
@@ -5384,6 +5392,38 @@ g_child_watch_prepare (GSource *source,
return g_atomic_int_get (&child_watch_source->child_exited);
}
+#ifdef HAVE_PIDFD
+static int
+siginfo_t_to_wait_status (const siginfo_t *info)
+{
+ /* Each of these returns is essentially the inverse of WIFEXITED(),
+ * WIFSIGNALED(), etc. */
+ switch (info->si_code)
+ {
+ case CLD_EXITED:
+ return W_EXITCODE (info->si_status, 0);
+ case CLD_KILLED:
+ return W_EXITCODE (0, info->si_status);
+ case CLD_DUMPED:
+#ifdef WCOREFLAG
+ return W_EXITCODE (0, info->si_status | WCOREFLAG);
+#else
+ g_assert_not_reached ();
+#endif
+ case CLD_CONTINUED:
+#ifdef __W_CONTINUED
+ return __W_CONTINUED;
+#else
+ g_assert_not_reached ();
+#endif
+ case CLD_STOPPED:
+ case CLD_TRAPPED:
+ default:
+ return W_STOPCODE (info->si_status);
+ }
+}
+#endif /* HAVE_PIDFD */
+
static gboolean
g_child_watch_check (GSource *source)
{
@@ -5391,6 +5431,34 @@ g_child_watch_check (GSource *source)
child_watch_source = (GChildWatchSource *) source;
+#ifdef HAVE_PIDFD
+ if (child_watch_source->using_pidfd)
+ {
+ gboolean child_exited = child_watch_source->poll.revents & G_IO_IN;
+
+ if (child_exited)
+ {
+ siginfo_t child_info = { 0, };
+
+ /* Get the exit status */
+ if (waitid (P_PIDFD, child_watch_source->poll.fd, &child_info, WEXITED | WNOHANG) >= 0 &&
+ child_info.si_pid != 0)
+ {
+ /* waitid() helpfully provides the wait status in a decomposed
+ * form which is quite useful. Unfortunately we have to report it
+ * to the #GChildWatchFunc as a waitpid()-style platform-specific
+ * wait status, so that the user code in #GChildWatchFunc can then
+ * call WIFEXITED() (etc.) on it. That means re-composing the
+ * status information. */
+ child_watch_source->child_status = siginfo_t_to_wait_status (&child_info);
+ child_watch_source->child_exited = TRUE;
+ }
+ }
+
+ return child_exited;
+ }
+#endif /* HAVE_PIDFD */
+
return g_atomic_int_get (&child_watch_source->child_exited);
}
@@ -5575,6 +5643,11 @@ g_unix_signal_watch_finalize (GSource *source)
static void
g_child_watch_finalize (GSource *source)
{
+ GChildWatchSource *child_watch_source = (GChildWatchSource *) source;
+
+ if (child_watch_source->using_pidfd)
+ return;
+
G_LOCK (unix_signal_lock);
unix_child_watches = g_slist_remove (unix_child_watches, source);
unref_unix_signal_handler_unlocked (SIGCHLD);
@@ -5676,6 +5749,9 @@ g_child_watch_source_new (GPid pid)
{
GSource *source;
GChildWatchSource *child_watch_source;
+#ifdef HAVE_PIDFD
+ int errsv;
+#endif
#ifndef G_OS_WIN32
g_return_val_if_fail (pid > 0, NULL);
@@ -5694,14 +5770,43 @@ g_child_watch_source_new (GPid pid)
child_watch_source->poll.events = G_IO_IN;
g_source_add_poll (source, &child_watch_source->poll);
-#else /* G_OS_WIN32 */
+#else /* !G_OS_WIN32 */
+
+#ifdef HAVE_PIDFD
+ /* Use a pidfd, if possible, to avoid having to install a global SIGCHLD
+ * handler and potentially competing with any other library/code which wants
+ * to install one.
+ *
+ * Unfortunately this use of pidfd isn’t race-free (the PID could be recycled
+ * between the caller calling g_child_watch_source_new() and here), but it’s
+ * better than SIGCHLD.
+ */
+ child_watch_source->poll.fd = (int) syscall (SYS_pidfd_open, pid, 0);
+ errsv = errno;
+
+ if (child_watch_source->poll.fd >= 0)
+ {
+ child_watch_source->using_pidfd = TRUE;
+ child_watch_source->poll.events = G_IO_IN;
+ g_source_add_poll (source, &child_watch_source->poll);
+
+ return source;
+ }
+ else
+ {
+ g_debug ("pidfd_open(%" G_PID_FORMAT ") failed with error: %s",
+ pid, g_strerror (errsv));
+ /* Fall through; likely the kernel isn’t new enough to support pidfd_open() */
+ }
+#endif /* HAVE_PIDFD */
+
G_LOCK (unix_signal_lock);
ref_unix_signal_handler_unlocked (SIGCHLD);
unix_child_watches = g_slist_prepend (unix_child_watches, child_watch_source);
if (waitpid (pid, &child_watch_source->child_status, WNOHANG) > 0)
child_watch_source->child_exited = TRUE;
G_UNLOCK (unix_signal_lock);
-#endif /* G_OS_WIN32 */
+#endif /* !G_OS_WIN32 */
return source;
}
diff --git a/meson.build b/meson.build
index a0223ce5b..1e1bd602c 100644
--- a/meson.build
+++ b/meson.build
@@ -810,6 +810,20 @@ if cc.links('''#include <sys/eventfd.h>
glib_conf.set('HAVE_EVENTFD', 1)
endif
+# Check for pidfd_open(2)
+if cc.links('''#include <sys/syscall.h>
+ #include <sys/wait.h>
+ #include <linux/wait.h>
+ #include <unistd.h>
+ int main (int argc, char ** argv) {
+ siginfo_t child_info = { 0, };
+ syscall (SYS_pidfd_open, 0, 0);
+ waitid (P_PIDFD, 0, &child_info, WEXITED | WNOHANG);
+ return 0;
+ }''', name : 'pidfd_open(2) system call')
+ glib_conf.set('HAVE_PIDFD', 1)
+endif
+
# Check for __uint128_t (gcc) by checking for 128-bit division
uint128_t_src = '''int main() {
static __uint128_t v1 = 100;
--
2.41.0
From 13c62bc181c6da9f287b737f7a3238e0269b40b3 Mon Sep 17 00:00:00 2001
From: Christian Hergert <chergert@redhat.com>
Date: Tue, 2 Aug 2022 12:35:40 -0700
Subject: [PATCH 2/4] gmain: close pidfd when finalizing GChildWatchSource
A file-descriptor was created with the introduction of pidfd_getfd() but
nothing is closing it when the source finalizes. The GChildWatchSource is
the creator and consumer of this FD and therefore responsible for closing
it on finalization.
The pidfd leak was introduced in !2408.
This fixes issues with Builder where anon_inode:[pidfd] exhaust the
available FD limit for the process.
Fixes #2708
---
glib/gmain.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/glib/gmain.c b/glib/gmain.c
index e9965f7f6..3ceec61ee 100644
--- a/glib/gmain.c
+++ b/glib/gmain.c
@@ -5646,7 +5646,11 @@ g_child_watch_finalize (GSource *source)
GChildWatchSource *child_watch_source = (GChildWatchSource *) source;
if (child_watch_source->using_pidfd)
- return;
+ {
+ if (child_watch_source->poll.fd >= 0)
+ close (child_watch_source->poll.fd);
+ return;
+ }
G_LOCK (unix_signal_lock);
unix_child_watches = g_slist_remove (unix_child_watches, source);
--
2.41.0
From 378c72cbe12767b8f6aedc19c7ca46c07aa1ca73 Mon Sep 17 00:00:00 2001
From: Owen Rafferty <owen@owenrafferty.com>
Date: Tue, 12 Jul 2022 20:03:56 -0500
Subject: [PATCH 3/4] gmain: define non-posix symbols
---
glib/gmain.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/glib/gmain.c b/glib/gmain.c
index 3ceec61ee..a2d7bb3ba 100644
--- a/glib/gmain.c
+++ b/glib/gmain.c
@@ -71,6 +71,12 @@
#include <sys/syscall.h>
#include <sys/wait.h>
#include <linux/wait.h> /* P_PIDFD */
+#ifndef W_EXITCODE
+#define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
+#endif
+#ifndef W_STOPCODE
+#define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
+#endif
#endif /* HAVE_PIDFD */
#ifdef G_OS_WIN32
--
2.41.0
From aac37188ce26366bd86626700d49cee0cb121472 Mon Sep 17 00:00:00 2001
From: Philip Withnall <pwithnall@endlessos.org>
Date: Wed, 21 Dec 2022 12:11:46 +0000
Subject: [PATCH 4/4] gmain: Define fallback values for siginfo_t constants for
musl
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
musl doesn’t define them itself, presumably because they’re not defined
in POSIX. glibc does define them. Thankfully, the values used in glibc
match the values used internally in other musl macros.
Define the values as a fallback. As a result of this, we can get rid of
the `g_assert_if_reached()` checks in `siginfo_t_to_wait_status()`.
This should fix catching signals from a subprocess when built against
musl.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Fixes: #2852
---
glib/gmain.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/glib/gmain.c b/glib/gmain.c
index a2d7bb3ba..f0cf700c0 100644
--- a/glib/gmain.c
+++ b/glib/gmain.c
@@ -77,6 +77,16 @@
#ifndef W_STOPCODE
#define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
#endif
+#ifndef WCOREFLAG
+/* musl doesn’t define WCOREFLAG while glibc does. Unfortunately, there’s no way
+ * to detect we’re building against musl, so just define it and hope.
+ * See https://git.musl-libc.org/cgit/musl/tree/include/sys/wait.h#n51 */
+#define WCOREFLAG 0x80
+#endif
+#ifndef __W_CONTINUED
+/* Same as above, for musl */
+#define __W_CONTINUED 0xffff
+#endif
#endif /* HAVE_PIDFD */
#ifdef G_OS_WIN32
@@ -5411,17 +5421,9 @@ siginfo_t_to_wait_status (const siginfo_t *info)
case CLD_KILLED:
return W_EXITCODE (0, info->si_status);
case CLD_DUMPED:
-#ifdef WCOREFLAG
return W_EXITCODE (0, info->si_status | WCOREFLAG);
-#else
- g_assert_not_reached ();
-#endif
case CLD_CONTINUED:
-#ifdef __W_CONTINUED
return __W_CONTINUED;
-#else
- g_assert_not_reached ();
-#endif
case CLD_STOPPED:
case CLD_TRAPPED:
default:
--
2.41.0

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@ -0,0 +1,195 @@
From 37e323f1d16720d662611866cde567b1d2a01d48 Mon Sep 17 00:00:00 2001
From: Ondrej Holy <oholy@redhat.com>
Date: Mon, 22 Jan 2024 15:29:37 +0100
Subject: [PATCH 1/2] gunixmounts: Use libmnt_monitor API for monitoring
The `GUnixMountMonitor` object implements monitoring on its own currently.
Only the `/proc/mounts` file changes are monitored. It is not aware of the
`/run/mount/utab` file changes. This file contains the userspace mount
options (e.g. `x-gvfs-notrash`, `x-gvfs-hide`) among others. There is a
problem when `/sbin/mount.<type>` (e.g. `mount.nfs`) helper programs are
used. In that case, the `/run/mount/utab` file is updated later than the
`/proc/mounts` file and thus the `GUnixMountMonitor` clients (e.g.
`gvfs-udisks2-volume-monitor`, `gvfsd-trash`) don't see the userspace
options until the next `mount-changed` signal. Let's use the `libmnt_monitor`
API for monitoring instead and emit the `mount-changed` signal also when the
`/run/mount/utab` file is changed.
Related: https://issues.redhat.com/browse/RHEL-14607
Related: https://github.com/util-linux/util-linux/pull/2607
---
gio/gunixmounts.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 71 insertions(+), 1 deletion(-)
diff --git a/gio/gunixmounts.c b/gio/gunixmounts.c
index 32b936259..e11b34a7d 100644
--- a/gio/gunixmounts.c
+++ b/gio/gunixmounts.c
@@ -202,6 +202,11 @@ static GSource *proc_mounts_watch_source;
#define endmntent(f) fclose(f)
#endif
+#ifdef HAVE_LIBMOUNT
+/* Protected by proc_mounts_source lock */
+static struct libmnt_monitor *proc_mounts_monitor = NULL;
+#endif
+
static gboolean
is_in (const char *value, const char *set[])
{
@@ -1859,7 +1864,36 @@ proc_mounts_changed (GIOChannel *channel,
GIOCondition cond,
gpointer user_data)
{
+ gboolean has_changed = FALSE;
+
+#ifdef HAVE_LIBMOUNT
+ if (cond & G_IO_IN)
+ {
+ G_LOCK (proc_mounts_source);
+ if (proc_mounts_monitor != NULL)
+ {
+ int ret;
+
+ /* The mnt_monitor_next_change function needs to be used to avoid false-positives. */
+ ret = mnt_monitor_next_change (proc_mounts_monitor, NULL, NULL);
+ if (ret == 0)
+ {
+ has_changed = TRUE;
+ ret = mnt_monitor_event_cleanup (proc_mounts_monitor);
+ }
+
+ if (ret < 0)
+ g_debug ("mnt_monitor_next_change failed: %s", g_strerror (-ret));
+ }
+ G_UNLOCK (proc_mounts_source);
+ }
+
+#else
if (cond & G_IO_ERR)
+ has_changed = TRUE;
+#endif
+
+ if (has_changed)
{
G_LOCK (proc_mounts_source);
mount_poller_time = (guint64) g_get_monotonic_time ();
@@ -1924,6 +1958,10 @@ mount_monitor_stop (void)
g_source_destroy (proc_mounts_watch_source);
proc_mounts_watch_source = NULL;
}
+
+#ifdef HAVE_LIBMOUNT
+ g_clear_pointer (&proc_mounts_monitor, mnt_unref_monitor);
+#endif
G_UNLOCK (proc_mounts_source);
if (mtab_monitor)
@@ -1965,9 +2003,37 @@ mount_monitor_start (void)
*/
if (g_str_has_prefix (mtab_path, "/proc/"))
{
- GIOChannel *proc_mounts_channel;
+ GIOChannel *proc_mounts_channel = NULL;
GError *error = NULL;
+#ifdef HAVE_LIBMOUNT
+ int ret;
+
+ G_LOCK (proc_mounts_source);
+
+ proc_mounts_monitor = mnt_new_monitor ();
+ ret = mnt_monitor_enable_kernel (proc_mounts_monitor, TRUE);
+ if (ret < 0)
+ g_warning ("mnt_monitor_enable_kernel failed: %s", g_strerror (-ret));
+
+ ret = mnt_monitor_enable_userspace (proc_mounts_monitor, TRUE, NULL);
+ if (ret < 0)
+ g_warning ("mnt_monitor_enable_userspace failed: %s", g_strerror (-ret));
+
+ ret = mnt_monitor_get_fd (proc_mounts_monitor);
+ if (ret >= 0)
+ {
+ proc_mounts_channel = g_io_channel_unix_new (ret);
+ }
+ else
+ {
+ g_set_error_literal (&error, G_IO_ERROR, g_io_error_from_errno (-ret),
+ g_strerror (-ret));
+ }
+
+ G_UNLOCK (proc_mounts_source);
+#else
proc_mounts_channel = g_io_channel_new_file (mtab_path, "r", &error);
+#endif
if (proc_mounts_channel == NULL)
{
g_warning ("Error creating IO channel for %s: %s (%s, %d)", mtab_path,
@@ -1978,7 +2044,11 @@ mount_monitor_start (void)
{
G_LOCK (proc_mounts_source);
+#ifdef HAVE_LIBMOUNT
+ proc_mounts_watch_source = g_io_create_watch (proc_mounts_channel, G_IO_IN);
+#else
proc_mounts_watch_source = g_io_create_watch (proc_mounts_channel, G_IO_ERR);
+#endif
mount_poller_time = (guint64) g_get_monotonic_time ();
g_source_set_callback (proc_mounts_watch_source,
(GSourceFunc) proc_mounts_changed,
--
2.43.0
From bb7d6b8fcef36af5452071c8758f89955888469a Mon Sep 17 00:00:00 2001
From: Ondrej Holy <oholy@redhat.com>
Date: Wed, 31 Jan 2024 13:35:39 +0100
Subject: [PATCH 2/2] gunixmounts: Use mnt_monitor_veil_kernel option
The previous commit enabled the `/run/mount/utab` monitoring. The problem
is that the `mount-changed` signal can be emitted twice for one mount. One
for the `/proc/mounts` file change and another one for the `/run/media/utab`
file change. This is still not ideal because e.g. the `GMount` objects for
mounts with the `x-gvfs-hide` option are added and immediately removed.
Let's enable the `mnt_monitor_veil_kernel` option to avoid this.
Related: https://github.com/util-linux/util-linux/pull/2725
---
gio/gunixmounts.c | 6 ++++++
meson.build | 4 ++++
2 files changed, 10 insertions(+)
diff --git a/gio/gunixmounts.c b/gio/gunixmounts.c
index e11b34a7d..6abe87414 100644
--- a/gio/gunixmounts.c
+++ b/gio/gunixmounts.c
@@ -2019,6 +2019,12 @@ mount_monitor_start (void)
if (ret < 0)
g_warning ("mnt_monitor_enable_userspace failed: %s", g_strerror (-ret));
+#ifdef HAVE_MNT_MONITOR_VEIL_KERNEL
+ ret = mnt_monitor_veil_kernel (proc_mounts_monitor, TRUE);
+ if (ret < 0)
+ g_warning ("mnt_monitor_veil_kernel failed: %s", g_strerror (-ret));
+#endif
+
ret = mnt_monitor_get_fd (proc_mounts_monitor);
if (ret >= 0)
{
diff --git a/meson.build b/meson.build
index a0502fe69..159703557 100644
--- a/meson.build
+++ b/meson.build
@@ -2102,6 +2102,10 @@ libmount_dep = []
if host_system == 'linux'
libmount_dep = dependency('mount', version : '>=2.23', required : get_option('libmount'))
glib_conf.set('HAVE_LIBMOUNT', libmount_dep.found())
+
+ if libmount_dep.found() and cc.has_function('mnt_monitor_veil_kernel', dependencies: libmount_dep)
+ glib_conf.set('HAVE_MNT_MONITOR_VEIL_KERNEL', 1)
+ endif
endif
# gnutls is used optionally by GHmac
--
2.43.0

25
SPECS/glib2.spec
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@ -1,6 +1,6 @@
Name: glib2
Version: 2.68.4
Release: 11%{?dist}
Release: 14%{?dist}
Summary: A library of handy utility functions
License: LGPLv2+
@ -43,6 +43,17 @@ Patch: 3163.patch
Patch: 2826.patch
Patch: 3272.patch
# https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2408
# https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2816
# https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2847
# https://gitlab.gnome.org/GNOME/glib/-/merge_requests/3158
Patch: 2408.patch
# https://gitlab.gnome.org/GNOME/glib/-/merge_requests/3353
Patch: 3353.patch
# https://gitlab.gnome.org/GNOME/glib/-/merge_requests/3845
Patch: 3845.patch
BuildRequires: chrpath
BuildRequires: gcc
BuildRequires: gcc-c++
@ -258,6 +269,18 @@ glib-compile-schemas %{_datadir}/glib-2.0/schemas &> /dev/null || :
%{_datadir}/installed-tests
%changelog
* Wed Feb 21 2024 Michael Catanzaro <mcatanzaro@redhat.com> - 2.68.4-14
- Rebuild against newer util-linux for libmnt changes
- Resolves: RHEL-23637
* Thu Feb 01 2024 Michael Catanzaro <mcatanzaro@redhat.com> - 2.68.4-13
- Backport GUnixMountMonitor port to libmnt_monitor
- Resolves: RHEL-23637
* Fri Nov 03 2023 Michael Catanzaro <mcatanzaro@redhat.com> - 2.68.4-12
- Fix race with waitpid() and child watcher sources
- Resolves: RHEL-14761
* Wed Jul 19 2023 Michael Catanzaro <mcatanzaro@redhat.com> - 2.68.4-11
- Really fix authentication failures when sd-bus clients connect to GDBus servers
- Resolves: #2217771