File Fix-a-potential-vulnerability-which-allows-chown-on-user-created-links.patch of Package pmix.30629
From: Egbert Eich <eich@suse.com>
Date: Tue Sep 12 15:51:49 2023 +0200
Subject: Fix a potential vulnerability which allows chown on user-created links
Patch-mainline: ae62cdf67b19e80fd821420816f09bf0a56a8166
Git-commit: 6364ce66b4ac487b684d512089eeb0c3d577ba98
References: bsc#1215190
This fixes CVE-2023-41915, bsc#1215190.
This is a backport of:
Do not follow links when doing "chown"
There is a potential issue with allowing a "chown" operation
to follow user-created links, so let's limit any use of that
function to "lchown" - which directs the "chown" operation to
NOT follow a link.
Signed-off-by: Ralph Castain <rhc@pmix.org>
Signed-off-by: Egbert Eich <eich@suse.com>
Signed-off-by: Egbert Eich <eich@suse.de>
---
src/mca/common/dstore/dstore_base.c | 4 ++--
src/mca/common/dstore/dstore_segment.c | 4 ++--
src/mca/gds/ds12/gds_ds12_lock_fcntl.c | 2 +-
src/mca/gds/ds12/gds_ds12_lock_pthread.c | 2 +-
src/mca/ptl/usock/ptl_usock_component.c | 4 ++--
src/util/pmix_pty.c | 3 ++-
6 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/src/mca/common/dstore/dstore_base.c b/src/mca/common/dstore/dstore_base.c
index f22461c..7ff2e4d 100644
--- a/src/mca/common/dstore/dstore_base.c
+++ b/src/mca/common/dstore/dstore_base.c
@@ -528,7 +528,7 @@ static int _esh_session_init(pmix_common_dstore_ctx_t *ds_ctx, size_t idx, ns_ma
}
}
if (s->setjobuid > 0){
- if (0 > chown(s->nspace_path, (uid_t) s->jobuid, (gid_t) -1)){
+ if (0 > lchown(s->nspace_path, (uid_t) s->jobuid, (gid_t) -1)){
rc = PMIX_ERROR;
PMIX_ERROR_LOG(rc);
return rc;
@@ -1682,7 +1682,7 @@ pmix_common_dstore_ctx_t *pmix_common_dstor_init(const char *ds_name, pmix_info_
}
}
if (ds_ctx->setjobuid > 0) {
- if (chown(ds_ctx->base_path, (uid_t) ds_ctx->jobuid, (gid_t) -1) < 0){
+ if (lchown(ds_ctx->base_path, (uid_t) ds_ctx->jobuid, (gid_t) -1) < 0){
rc = PMIX_ERR_NO_PERMISSIONS;
PMIX_ERROR_LOG(rc);
goto err_exit;
diff --git a/src/mca/common/dstore/dstore_segment.c b/src/mca/common/dstore/dstore_segment.c
index f0c4f9b..0e68dbf 100644
--- a/src/mca/common/dstore/dstore_segment.c
+++ b/src/mca/common/dstore/dstore_segment.c
@@ -120,7 +120,7 @@ PMIX_EXPORT pmix_dstore_seg_desc_t *pmix_common_dstor_create_new_lock_seg(const
if (setuid > 0){
rc = PMIX_ERR_PERM;
- if (0 > chown(file_name, (uid_t) uid, (gid_t) -1)){
+ if (0 > lchown(file_name, (uid_t) uid, (gid_t) -1)){
PMIX_ERROR_LOG(rc);
goto err_exit;
}
@@ -211,7 +211,7 @@ PMIX_EXPORT pmix_dstore_seg_desc_t *pmix_common_dstor_create_new_segment(pmix_ds
if (setuid > 0){
rc = PMIX_ERR_PERM;
- if (0 > chown(file_name, (uid_t) uid, (gid_t) -1)){
+ if (0 > lchown(file_name, (uid_t) uid, (gid_t) -1)){
PMIX_ERROR_LOG(rc);
goto err_exit;
}
diff --git a/src/mca/gds/ds12/gds_ds12_lock_fcntl.c b/src/mca/gds/ds12/gds_ds12_lock_fcntl.c
index 4452316..82b6d35 100644
--- a/src/mca/gds/ds12/gds_ds12_lock_fcntl.c
+++ b/src/mca/gds/ds12/gds_ds12_lock_fcntl.c
@@ -127,7 +127,7 @@ pmix_status_t pmix_gds_ds12_lock_init(pmix_common_dstor_lock_ctx_t *ctx, const c
}
}
if (0 != setuid) {
- if (0 > chown(lock_ctx->lockfile, uid, (gid_t) -1)) {
+ if (0 > lchown(lock_ctx->lockfile, uid, (gid_t) -1)) {
rc = PMIX_ERROR;
PMIX_ERROR_LOG(rc);
goto error;
diff --git a/src/mca/gds/ds12/gds_ds12_lock_pthread.c b/src/mca/gds/ds12/gds_ds12_lock_pthread.c
index 8192f05..57d855f 100644
--- a/src/mca/gds/ds12/gds_ds12_lock_pthread.c
+++ b/src/mca/gds/ds12/gds_ds12_lock_pthread.c
@@ -113,7 +113,7 @@ pmix_status_t pmix_gds_ds12_lock_init(pmix_common_dstor_lock_ctx_t *ctx, const c
}
memset(lock_ctx->segment->seg_base_addr, 0, size);
if (0 != setuid) {
- if (0 > chown(lock_ctx->lockfile, (uid_t) uid, (gid_t) -1)){
+ if (0 > lchown(lock_ctx->lockfile, (uid_t) uid, (gid_t) -1)){
rc = PMIX_ERROR;
PMIX_ERROR_LOG(rc);
goto error;
diff --git a/src/mca/ptl/usock/ptl_usock_component.c b/src/mca/ptl/usock/ptl_usock_component.c
index 3120302..ff2542d 100644
--- a/src/mca/ptl/usock/ptl_usock_component.c
+++ b/src/mca/ptl/usock/ptl_usock_component.c
@@ -267,14 +267,14 @@ static pmix_status_t setup_listener(pmix_info_t info[], size_t ninfo,
}
/* chown as required */
if (lt->owner_given) {
- if (0 != chown(address->sun_path, lt->owner, -1)) {
+ if (0 != lchown(address->sun_path, lt->owner, -1)) {
pmix_output(0, "CANNOT CHOWN socket %s: %s", address->sun_path, strerror (errno));
CLOSE_THE_SOCKET(lt->socket);
goto sockerror;
}
}
if (lt->group_given) {
- if (0 != chown(address->sun_path, -1, lt->group)) {
+ if (0 != lchown(address->sun_path, -1, lt->group)) {
pmix_output(0, "CANNOT CHOWN socket %s: %s", address->sun_path, strerror (errno));
CLOSE_THE_SOCKET(lt->socket);
goto sockerror;
diff --git a/src/util/pmix_pty.c b/src/util/pmix_pty.c
index 58e8d51..a5e3c0c 100644
--- a/src/util/pmix_pty.c
+++ b/src/util/pmix_pty.c
@@ -11,6 +11,7 @@
* All rights reserved.
* Copyright (c) 2018 Cisco Systems, Inc. All rights reserved
* Copyright (c) 2019-2020 Intel, Inc. All rights reserved.
+ * Copyright (c) 2021-2023 Nanook Consulting. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
@@ -248,7 +249,7 @@ static int ptys_open(int fdm, char *pts_name)
gid = -1; /* group tty is not in the group file */
}
/* following two functions don't work unless we're root */
- chown(pts_name, getuid(), gid);
+ lchown(pts_name, getuid(), gid); // DO NOT FOLLOW LINKS
chmod(pts_name, S_IRUSR | S_IWUSR | S_IWGRP);
fds = open(pts_name, O_RDWR);
if (fds < 0) {
