Backport from systemd.git. CVE: CVE-2020-13776
Signed-off-by: Joe Slater <joe.sla...@windriver.com> --- .../systemd/systemd/CVE-2020-13776.patch | 94 ++++++++++++++++++++++ meta/recipes-core/systemd/systemd_245.6.bb | 1 + 2 files changed, 95 insertions(+) create mode 100644 meta/recipes-core/systemd/systemd/CVE-2020-13776.patch diff --git a/meta/recipes-core/systemd/systemd/CVE-2020-13776.patch b/meta/recipes-core/systemd/systemd/CVE-2020-13776.patch new file mode 100644 index 0000000..f4fde26 --- /dev/null +++ b/meta/recipes-core/systemd/systemd/CVE-2020-13776.patch @@ -0,0 +1,94 @@ +From 156a5fd297b61bce31630d7a52c15614bf784843 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbys...@in.waw.pl> +Date: Sun, 31 May 2020 18:21:09 +0200 +Subject: [PATCH 1/1] basic/user-util: always use base 10 for user/group + numbers + +We would parse numbers with base prefixes as user identifiers. For example, +"0x2b3bfa0" would be interpreted as UID==45334432 and "01750" would be +interpreted as UID==1000. This parsing was used also in cases where either a +user/group name or number may be specified. This means that names like +0x2b3bfa0 would be ambiguous: they are a valid user name according to our +documented relaxed rules, but they would also be parsed as numeric uids. + +This behaviour is definitely not expected by users, since tools generally only +accept decimal numbers (e.g. id, getent passwd), while other tools only accept +user names and thus will interpret such strings as user names without even +attempting to convert them to numbers (su, ssh). So let's follow suit and only +accept numbers in decimal notation. Effectively this means that we will reject +such strings as a username/uid/groupname/gid where strict mode is used, and try +to look up a user/group with such a name in relaxed mode. + +Since the function changed is fairly low-level and fairly widely used, this +affects multiple tools: loginctl show-user/enable-linger/disable-linger foo', +the third argument in sysusers.d, fourth and fifth arguments in tmpfiles.d, +etc. + +Fixes #15985. +--- + src/basic/user-util.c | 2 +- + src/test/test-user-util.c | 10 ++++++++++ + 2 files changed, 11 insertions(+), 1 deletion(-) + +--- end of commit 156a5fd297b61bce31630d7a52c15614bf784843 --- + + +Add definition of safe_atou32_full() from commit b934ac3d6e7dcad114776ef30ee9098693e7ab7e + +Upstream-Status: Backport [https://github.com/systemd/systemd.git] + +Signed-off-by: Joe Slater <joe.sla...@windriver.com> + + + +--- git.orig/src/basic/user-util.c ++++ git/src/basic/user-util.c +@@ -49,7 +49,7 @@ int parse_uid(const char *s, uid_t *ret) + assert(s); + + assert_cc(sizeof(uid_t) == sizeof(uint32_t)); +- r = safe_atou32(s, &uid); ++ r = safe_atou32_full(s, 10, &uid); + if (r < 0) + return r; + +--- git.orig/src/test/test-user-util.c ++++ git/src/test/test-user-util.c +@@ -48,9 +48,19 @@ static void test_parse_uid(void) { + + r = parse_uid("65535", &uid); + assert_se(r == -ENXIO); ++ assert_se(uid == 100); ++ ++ r = parse_uid("0x1234", &uid); ++ assert_se(r == -EINVAL); ++ assert_se(uid == 100); ++ ++ r = parse_uid("01234", &uid); ++ assert_se(r == 0); ++ assert_se(uid == 1234); + + r = parse_uid("asdsdas", &uid); + assert_se(r == -EINVAL); ++ assert_se(uid == 1234); + } + + static void test_uid_ptr(void) { +--- git.orig/src/basic/parse-util.h ++++ git/src/basic/parse-util.h +@@ -45,9 +45,13 @@ static inline int safe_atoux16(const cha + + int safe_atoi16(const char *s, int16_t *ret); + +-static inline int safe_atou32(const char *s, uint32_t *ret_u) { ++static inline int safe_atou32_full(const char *s, unsigned base, uint32_t *ret_u) { + assert_cc(sizeof(uint32_t) == sizeof(unsigned)); +- return safe_atou(s, (unsigned*) ret_u); ++ return safe_atou_full(s, base, (unsigned*) ret_u); ++} ++ ++static inline int safe_atou32(const char *s, uint32_t *ret_u) { ++ return safe_atou32_full(s, 0, (unsigned*) ret_u); + } + + static inline int safe_atoi32(const char *s, int32_t *ret_i) { diff --git a/meta/recipes-core/systemd/systemd_245.6.bb b/meta/recipes-core/systemd/systemd_245.6.bb index ece4220..b6681b2 100644 --- a/meta/recipes-core/systemd/systemd_245.6.bb +++ b/meta/recipes-core/systemd/systemd_245.6.bb @@ -20,6 +20,7 @@ SRC_URI += "file://touchscreen.rules \ file://99-default.preset \ file://0001-binfmt-Don-t-install-dependency-links-at-install-tim.patch \ file://0003-implment-systemd-sysv-install-for-OE.patch \ + file://CVE-2020-13776.patch \ " # patches needed by musl -- 2.7.4
-=-=-=-=-=-=-=-=-=-=-=- Links: You receive all messages sent to this group. View/Reply Online (#139424): https://lists.openembedded.org/g/openembedded-core/message/139424 Mute This Topic: https://lists.openembedded.org/mt/74824755/21656 Group Owner: openembedded-core+ow...@lists.openembedded.org Unsubscribe: https://lists.openembedded.org/g/openembedded-core/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
