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Posted to common-commits@hadoop.apache.org by ey...@apache.org on 2018/07/27 00:12:47 UTC
[24/50] hadoop git commit: Disable mounting cgroups by default
(miklos.szegedi@cloudera.com via rkanter)
Disable mounting cgroups by default (miklos.szegedi@cloudera.com via rkanter)
(cherry picked from commit 351cf87c92872d90f62c476f85ae4d02e485769c)
Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/27e2b4b3
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/27e2b4b3
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/27e2b4b3
Branch: refs/remotes/origin/branch-3.1
Commit: 27e2b4b36456ea5f42d38329dcc6bee0cb7b7ac0
Parents: d82edec
Author: Robert Kanter <rk...@apache.org>
Authored: Thu Jun 7 17:09:34 2018 -0700
Committer: Robert Kanter <rk...@apache.org>
Committed: Wed Jul 18 16:07:48 2018 -0700
----------------------------------------------------------------------
.../impl/container-executor.c | 54 ++++++++++++++------
.../impl/container-executor.h | 4 ++
.../main/native/container-executor/impl/main.c | 19 ++++---
.../src/site/markdown/NodeManagerCgroups.md | 2 +-
4 files changed, 55 insertions(+), 24 deletions(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/27e2b4b3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.c
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diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.c b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.c
index 1b8842a..baf0e8b 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.c
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.c
@@ -73,6 +73,7 @@ static const char* DEFAULT_BANNED_USERS[] = {"yarn", "mapred", "hdfs", "bin", 0}
static const int DEFAULT_DOCKER_SUPPORT_ENABLED = 0;
static const int DEFAULT_TC_SUPPORT_ENABLED = 0;
+static const int DEFAULT_MOUNT_CGROUP_SUPPORT_ENABLED = 0;
static const char* PROC_PATH = "/proc";
@@ -482,6 +483,12 @@ int is_tc_support_enabled() {
DEFAULT_TC_SUPPORT_ENABLED, &executor_cfg);
}
+int is_mount_cgroups_support_enabled() {
+ return is_feature_enabled(MOUNT_CGROUP_SUPPORT_ENABLED_KEY,
+ DEFAULT_MOUNT_CGROUP_SUPPORT_ENABLED,
+ &executor_cfg);
+}
+
/**
* Utility function to concatenate argB to argA using the concat_pattern.
*/
@@ -2346,20 +2353,25 @@ void chown_dir_contents(const char *dir_path, uid_t uid, gid_t gid) {
DIR *dp;
struct dirent *ep;
- char *path_tmp = malloc(strlen(dir_path) + NAME_MAX + 2);
+ size_t len = strlen(dir_path) + NAME_MAX + 2;
+ char *path_tmp = malloc(len);
if (path_tmp == NULL) {
return;
}
- char *buf = stpncpy(path_tmp, dir_path, strlen(dir_path));
- *buf++ = '/';
-
dp = opendir(dir_path);
if (dp != NULL) {
while ((ep = readdir(dp)) != NULL) {
- stpncpy(buf, ep->d_name, strlen(ep->d_name));
- buf[strlen(ep->d_name)] = '\0';
- change_owner(path_tmp, uid, gid);
+ if (strcmp(ep->d_name, ".") != 0 &&
+ strcmp(ep->d_name, "..") != 0 &&
+ strstr(ep->d_name, "..") == NULL) {
+ int result = snprintf(path_tmp, len, "%s/%s", dir_path, ep->d_name);
+ if (result > 0 && result < len) {
+ change_owner(path_tmp, uid, gid);
+ } else {
+ fprintf(LOGFILE, "Ignored %s/%s due to length", dir_path, ep->d_name);
+ }
+ }
}
closedir(dp);
}
@@ -2383,11 +2395,16 @@ int mount_cgroup(const char *pair, const char *hierarchy) {
char *mount_path = malloc(len);
char hier_path[EXECUTOR_PATH_MAX];
int result = 0;
- struct stat sb;
if (controller == NULL || mount_path == NULL) {
fprintf(LOGFILE, "Failed to mount cgroup controller; not enough memory\n");
result = OUT_OF_MEMORY;
+ goto cleanup;
+ }
+ if (hierarchy == NULL || strstr(hierarchy, "..") != NULL) {
+ fprintf(LOGFILE, "Unsupported cgroup hierarhy path detected.\n");
+ result = INVALID_COMMAND_PROVIDED;
+ goto cleanup;
}
if (get_kv_key(pair, controller, len) < 0 ||
get_kv_value(pair, mount_path, len) < 0) {
@@ -2395,13 +2412,10 @@ int mount_cgroup(const char *pair, const char *hierarchy) {
pair);
result = -1;
} else {
- if (stat(mount_path, &sb) != 0) {
- // Create mount point, if it does not exist
- const mode_t mount_perms = S_IRWXU | S_IRGRP | S_IXGRP;
- if (mkdirs(mount_path, mount_perms) == 0) {
- fprintf(LOGFILE, "Failed to create cgroup mount point %s at %s\n",
- controller, mount_path);
- }
+ if (strstr(mount_path, "..") != NULL) {
+ fprintf(LOGFILE, "Unsupported cgroup mount path detected.\n");
+ result = INVALID_COMMAND_PROVIDED;
+ goto cleanup;
}
if (mount("none", mount_path, "cgroup", 0, controller) == 0) {
char *buf = stpncpy(hier_path, mount_path, strlen(mount_path));
@@ -2410,13 +2424,20 @@ int mount_cgroup(const char *pair, const char *hierarchy) {
// create hierarchy as 0750 and chown to Hadoop NM user
const mode_t perms = S_IRWXU | S_IRGRP | S_IXGRP;
+ struct stat sb;
+ if (stat(hier_path, &sb) == 0 &&
+ (sb.st_uid != nm_uid || sb.st_gid != nm_gid)) {
+ fprintf(LOGFILE, "cgroup hierarchy %s already owned by another user %d\n", hier_path, sb.st_uid);
+ result = INVALID_COMMAND_PROVIDED;
+ goto cleanup;
+ }
if (mkdirs(hier_path, perms) == 0) {
change_owner(hier_path, nm_uid, nm_gid);
chown_dir_contents(hier_path, nm_uid, nm_gid);
}
} else {
fprintf(LOGFILE, "Failed to mount cgroup controller %s at %s - %s\n",
- controller, mount_path, strerror(errno));
+ controller, mount_path, strerror(errno));
// if controller is already mounted, don't stop trying to mount others
if (errno != EBUSY) {
result = -1;
@@ -2424,6 +2445,7 @@ int mount_cgroup(const char *pair, const char *hierarchy) {
}
}
+cleanup:
free(controller);
free(mount_path);
http://git-wip-us.apache.org/repos/asf/hadoop/blob/27e2b4b3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.h
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.h b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.h
index 9136606..32e953d 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.h
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/container-executor.h
@@ -64,6 +64,7 @@ enum operations {
#define ALLOWED_SYSTEM_USERS_KEY "allowed.system.users"
#define DOCKER_SUPPORT_ENABLED_KEY "feature.docker.enabled"
#define TC_SUPPORT_ENABLED_KEY "feature.tc.enabled"
+#define MOUNT_CGROUP_SUPPORT_ENABLED_KEY "feature.mount-cgroup.enabled"
#define TMP_DIR "tmp"
extern struct passwd *user_detail;
@@ -238,6 +239,9 @@ int is_feature_enabled(const char* feature_key, int default_value,
/** Check if tc (traffic control) support is enabled in configuration. */
int is_tc_support_enabled();
+/** Check if cgroup mount support is enabled in configuration. */
+int is_mount_cgroups_support_enabled();
+
/**
* Run a batch of tc commands that modify interface configuration
*/
http://git-wip-us.apache.org/repos/asf/hadoop/blob/27e2b4b3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/main.c
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diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/main.c b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/main.c
index 1ed3ce8..76fa39f 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/main.c
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/native/container-executor/impl/main.c
@@ -270,14 +270,19 @@ static int validate_arguments(int argc, char **argv , int *operation) {
}
if (strcmp("--mount-cgroups", argv[1]) == 0) {
- if (argc < 4) {
- display_usage(stdout);
- return INVALID_ARGUMENT_NUMBER;
+ if (is_mount_cgroups_support_enabled()) {
+ if (argc < 4) {
+ display_usage(stdout);
+ return INVALID_ARGUMENT_NUMBER;
+ }
+ optind++;
+ cmd_input.cgroups_hierarchy = argv[optind++];
+ *operation = MOUNT_CGROUPS;
+ return 0;
+ } else {
+ display_feature_disabled_message("mount cgroup");
+ return FEATURE_DISABLED;
}
- optind++;
- cmd_input.cgroups_hierarchy = argv[optind++];
- *operation = MOUNT_CGROUPS;
- return 0;
}
if (strcmp("--tc-modify-state", argv[1]) == 0) {
http://git-wip-us.apache.org/repos/asf/hadoop/blob/27e2b4b3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/NodeManagerCgroups.md
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diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/NodeManagerCgroups.md b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/NodeManagerCgroups.md
index d362801..4a83dce 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/NodeManagerCgroups.md
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/NodeManagerCgroups.md
@@ -50,7 +50,7 @@ YARN uses CGroups through a directory structure mounted into the file system by
| Option | Description |
|:---- |:---- |
| Discover CGroups mounted already | This should be used on newer systems like RHEL7 or Ubuntu16 or if the administrator mounts CGroups before YARN starts. Set `yarn.nodemanager.linux-container-executor.cgroups.mount` to false and leave other settings set to their defaults. YARN will locate the mount points in `/proc/mounts`. Common locations include `/sys/fs/cgroup` and `/cgroup`. The default location can vary depending on the Linux distribution in use.|
-| CGroups mounted by YARN | If the system does not have CGroups mounted or it is mounted to an inaccessible location then point `yarn.nodemanager.linux-container-executor.cgroups.mount-path` to an empty directory. Set `yarn.nodemanager.linux-container-executor.cgroups.mount` to true. A point to note here is that the container-executor binary will try to create and mount each subsystem as a subdirectory under this path. If `cpu` is already mounted somewhere with `cpuacct`, then the directory `cpu,cpuacct` will be created for the hierarchy.|
+| CGroups mounted by YARN | IMPORTANT: This option is deprecated due to security reasons with the `container-executor.cfg` option `feature.mount-cgroup.enabled=0` by default. Please mount cgroups before launching YARN.|
| CGroups mounted already or linked but not in `/proc/mounts` | If cgroups is accessible through lxcfs or simulated by another filesystem, then point `yarn.nodemanager.linux-container-executor.cgroups.mount-path` to your CGroups root directory. Set `yarn.nodemanager.linux-container-executor.cgroups.mount` to false. YARN tries to use this path first, before any CGroup mount point discovery. The path should have a subdirectory for each CGroup hierarchy named by the comma separated CGroup subsystems supported like `<path>/cpu,cpuacct`. Valid subsystem names are `cpu, cpuacct, cpuset, memory, net_cls, blkio, freezer, devices`.|
CGroups and security
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