From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 21 Mar 2025 16:51:18 +0000 (+0100)
Subject: core: not sure why but TTYRows/TTYColumns property is 16bit towards outside, 32bit... 
X-Git-Tag: v256.13~20
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e40142c1abdff8475e689f219447d4093f3f2bae;p=thirdparty%2Fsystemd.git

core: not sure why but TTYRows/TTYColumns property is 16bit towards outside, 32bit inside, handle that properly

(cherry picked from commit ed13622bc83deeade066aac31cd96d5c52efe028)
(cherry picked from commit e3b16c73ae0263ded58297e0ed7a080c76217e71)
---

diff --git a/src/core/dbus-execute.c b/src/core/dbus-execute.c
index b0d9402e53c..c746372137f 100644
--- a/src/core/dbus-execute.c
+++ b/src/core/dbus-execute.c
@@ -943,6 +943,23 @@ static int property_get_image_policy(
         return sd_bus_message_append(reply, "s", s);
 }
 
+static int property_get_unsigned_as_uint16(
+                sd_bus *bus,
+                const char *path,
+                const char *interface,
+                const char *property,
+                sd_bus_message *reply,
+                void *userdata,
+                sd_bus_error *error) {
+
+        unsigned *value = ASSERT_PTR(userdata);
+
+        /* Returns an unsigned as a D-Bus "q" type, i.e. as 16-bit value, even if unsigned is 32-bit. We'll saturate if it doesn't fit. */
+
+        uint16_t q = *value >= UINT16_MAX ? UINT16_MAX : (uint16_t) *value;
+        return sd_bus_message_append_basic(reply, 'q', &q);
+}
+
 const sd_bus_vtable bus_exec_vtable[] = {
         SD_BUS_VTABLE_START(0),
         SD_BUS_PROPERTY("Environment", "as", NULL, offsetof(ExecContext, environment), SD_BUS_VTABLE_PROPERTY_CONST),
@@ -1020,8 +1037,8 @@ const sd_bus_vtable bus_exec_vtable[] = {
         SD_BUS_PROPERTY("TTYReset", "b", bus_property_get_bool, offsetof(ExecContext, tty_reset), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("TTYVHangup", "b", bus_property_get_bool, offsetof(ExecContext, tty_vhangup), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("TTYVTDisallocate", "b", bus_property_get_bool, offsetof(ExecContext, tty_vt_disallocate), SD_BUS_VTABLE_PROPERTY_CONST),
-        SD_BUS_PROPERTY("TTYRows", "q", bus_property_get_unsigned, offsetof(ExecContext, tty_rows), SD_BUS_VTABLE_PROPERTY_CONST),
-        SD_BUS_PROPERTY("TTYColumns", "q", bus_property_get_unsigned, offsetof(ExecContext, tty_cols), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("TTYRows", "q", property_get_unsigned_as_uint16, offsetof(ExecContext, tty_rows), SD_BUS_VTABLE_PROPERTY_CONST),
+        SD_BUS_PROPERTY("TTYColumns", "q", property_get_unsigned_as_uint16, offsetof(ExecContext, tty_cols), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("SyslogPriority", "i", bus_property_get_int, offsetof(ExecContext, syslog_priority), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("SyslogIdentifier", "s", NULL, offsetof(ExecContext, syslog_identifier), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("SyslogLevelPrefix", "b", bus_property_get_bool, offsetof(ExecContext, syslog_level_prefix), SD_BUS_VTABLE_PROPERTY_CONST),