diff options
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2022-0492.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2022-0492.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2022-0492.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2022-0492.patch new file mode 100644 index 000000000..409689e4b --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/CVE-2022-0492.patch @@ -0,0 +1,54 @@ +From 24f6008564183aa120d07c03d9289519c2fe02af Mon Sep 17 00:00:00 2001 +From: "Eric W. Biederman" <ebiederm@xmission.com> +Date: Thu, 20 Jan 2022 11:04:01 -0600 +Subject: cgroup-v1: Require capabilities to set release_agent + +The cgroup release_agent is called with call_usermodehelper. The function +call_usermodehelper starts the release_agent with a full set fo capabilities. +Therefore require capabilities when setting the release_agaent. + +Reported-by: Tabitha Sable <tabitha.c.sable@gmail.com> +Tested-by: Tabitha Sable <tabitha.c.sable@gmail.com> +Fixes: 81a6a5cdd2c5 ("Task Control Groups: automatic userspace notification of idle cgroups") +Cc: stable@vger.kernel.org # v2.6.24+ +Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> +Signed-off-by: Tejun Heo <tj@kernel.org> +--- + kernel/cgroup/cgroup-v1.c | 14 ++++++++++++++ + 1 file changed, 14 insertions(+) + +diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c +index 41e0837a5a0bd..0e877dbcfeea9 100644 +--- a/kernel/cgroup/cgroup-v1.c ++++ b/kernel/cgroup/cgroup-v1.c +@@ -549,6 +549,14 @@ static ssize_t cgroup_release_agent_write(struct kernfs_open_file *of, + + BUILD_BUG_ON(sizeof(cgrp->root->release_agent_path) < PATH_MAX); + ++ /* ++ * Release agent gets called with all capabilities, ++ * require capabilities to set release agent. ++ */ ++ if ((of->file->f_cred->user_ns != &init_user_ns) || ++ !capable(CAP_SYS_ADMIN)) ++ return -EPERM; ++ + cgrp = cgroup_kn_lock_live(of->kn, false); + if (!cgrp) + return -ENODEV; +@@ -954,6 +962,12 @@ int cgroup1_parse_param(struct fs_context *fc, struct fs_parameter *param) + /* Specifying two release agents is forbidden */ + if (ctx->release_agent) + return invalfc(fc, "release_agent respecified"); ++ /* ++ * Release agent gets called with all capabilities, ++ * require capabilities to set release agent. ++ */ ++ if ((fc->user_ns != &init_user_ns) || !capable(CAP_SYS_ADMIN)) ++ return invalfc(fc, "Setting release_agent not allowed"); + ctx->release_agent = param->string; + param->string = NULL; + break; +-- +cgit 1.2.3-1.el7 + |