diff options
Diffstat (limited to 'core/systemd/0001-polkit-Avoid-race-condition-in-scraping-proc.patch')
| -rw-r--r-- | core/systemd/0001-polkit-Avoid-race-condition-in-scraping-proc.patch | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/core/systemd/0001-polkit-Avoid-race-condition-in-scraping-proc.patch b/core/systemd/0001-polkit-Avoid-race-condition-in-scraping-proc.patch new file mode 100644 index 000000000..d3c09781c --- /dev/null +++ b/core/systemd/0001-polkit-Avoid-race-condition-in-scraping-proc.patch @@ -0,0 +1,75 @@ +From 72fd713962ca2c2450e23b01d9e22017a7e28fd4 Mon Sep 17 00:00:00 2001 +From: Colin Walters <walters@verbum.org> +Date: Thu, 22 Aug 2013 13:55:21 -0400 +Subject: [PATCH] polkit: Avoid race condition in scraping /proc + +If a calling process execve()s a setuid program, it can appear to be +uid 0. Since we're receiving requests over DBus, avoid this by simply +passing system-bus-name as a subject. +--- + src/shared/polkit.c | 31 +++++-------------------------- + 1 file changed, 5 insertions(+), 26 deletions(-) + +diff --git a/src/shared/polkit.c b/src/shared/polkit.c +index cea7074..1c5e9e3 100644 +--- a/src/shared/polkit.c ++++ b/src/shared/polkit.c +@@ -38,12 +38,8 @@ int verify_polkit( + + #ifdef ENABLE_POLKIT + DBusMessage *m = NULL, *reply = NULL; +- const char *unix_process = "unix-process", *pid = "pid", *starttime = "start-time", *cancel_id = ""; ++ const char *system_bus_name = "system-bus-name", *name = "name", *cancel_id = ""; + uint32_t flags = interactive ? 1 : 0; +- pid_t pid_raw; +- uint32_t pid_u32; +- unsigned long long starttime_raw; +- uint64_t starttime_u64; + DBusMessageIter iter_msg, iter_struct, iter_array, iter_dict, iter_variant; + int r; + dbus_bool_t authorized = FALSE, challenge = FALSE; +@@ -68,14 +64,6 @@ int verify_polkit( + + #ifdef ENABLE_POLKIT + +- pid_raw = bus_get_unix_process_id(c, sender, error); +- if (pid_raw == 0) +- return -EINVAL; +- +- r = get_starttime_of_pid(pid_raw, &starttime_raw); +- if (r < 0) +- return r; +- + m = dbus_message_new_method_call( + "org.freedesktop.PolicyKit1", + "/org/freedesktop/PolicyKit1/Authority", +@@ -86,22 +74,13 @@ int verify_polkit( + + dbus_message_iter_init_append(m, &iter_msg); + +- pid_u32 = (uint32_t) pid_raw; +- starttime_u64 = (uint64_t) starttime_raw; +- + if (!dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_STRUCT, NULL, &iter_struct) || +- !dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &unix_process) || ++ !dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &system_bus_name) || + !dbus_message_iter_open_container(&iter_struct, DBUS_TYPE_ARRAY, "{sv}", &iter_array) || + !dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) || +- !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &pid) || +- !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "u", &iter_variant) || +- !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT32, &pid_u32) || +- !dbus_message_iter_close_container(&iter_dict, &iter_variant) || +- !dbus_message_iter_close_container(&iter_array, &iter_dict) || +- !dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) || +- !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &starttime) || +- !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "t", &iter_variant) || +- !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT64, &starttime_u64) || ++ !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &name) || ++ !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "s", &iter_variant) || ++ !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_STRING, &sender) || + !dbus_message_iter_close_container(&iter_dict, &iter_variant) || + !dbus_message_iter_close_container(&iter_array, &iter_dict) || + !dbus_message_iter_close_container(&iter_struct, &iter_array) || +-- +1.8.4 + |