From: Tejun Heo <tj@kernel.org> To: Linus Torvalds <torvalds@linux-foundation.org> Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org Subject: [GIT PULL] cgroup fixes for v5.13-rc5 Date: Thu, 10 Jun 2021 10:26:06 -0400 [thread overview] Message-ID: <YMIg/rC1TQwEbabA@slm.duckdns.org> (raw) Hello, Linus. This is a high priority but low risk fix for a cgroup1 bug where rename(2) can change a cgroup's name to something which can break parsing of /proc/PID/cgroup. Thanks. The following changes since commit 08b2b6fdf6b26032f025084ce2893924a0cdb4a2: cgroup: fix spelling mistakes (2021-05-24 12:45:26 -0400) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-5.13-fixes for you to fetch changes up to b7e24eb1caa5f8da20d405d262dba67943aedc42: cgroup1: don't allow '\n' in renaming (2021-06-10 09:58:50 -0400) ---------------------------------------------------------------- Alexander Kuznetsov (1): cgroup1: don't allow '\n' in renaming kernel/cgroup/cgroup-v1.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c index 8190b6bfc978..1f274d7fc934 100644 --- a/kernel/cgroup/cgroup-v1.c +++ b/kernel/cgroup/cgroup-v1.c @@ -820,6 +820,10 @@ static int cgroup1_rename(struct kernfs_node *kn, struct kernfs_node *new_parent struct cgroup *cgrp = kn->priv; int ret; + /* do not accept '\n' to prevent making /proc/<pid>/cgroup unparsable */ + if (strchr(new_name_str, '\n')) + return -EINVAL; + if (kernfs_type(kn) != KERNFS_DIR) return -ENOTDIR; if (kn->parent != new_parent)
WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> To: Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org> Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Subject: [GIT PULL] cgroup fixes for v5.13-rc5 Date: Thu, 10 Jun 2021 10:26:06 -0400 [thread overview] Message-ID: <YMIg/rC1TQwEbabA@slm.duckdns.org> (raw) Hello, Linus. This is a high priority but low risk fix for a cgroup1 bug where rename(2) can change a cgroup's name to something which can break parsing of /proc/PID/cgroup. Thanks. The following changes since commit 08b2b6fdf6b26032f025084ce2893924a0cdb4a2: cgroup: fix spelling mistakes (2021-05-24 12:45:26 -0400) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-5.13-fixes for you to fetch changes up to b7e24eb1caa5f8da20d405d262dba67943aedc42: cgroup1: don't allow '\n' in renaming (2021-06-10 09:58:50 -0400) ---------------------------------------------------------------- Alexander Kuznetsov (1): cgroup1: don't allow '\n' in renaming kernel/cgroup/cgroup-v1.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c index 8190b6bfc978..1f274d7fc934 100644 --- a/kernel/cgroup/cgroup-v1.c +++ b/kernel/cgroup/cgroup-v1.c @@ -820,6 +820,10 @@ static int cgroup1_rename(struct kernfs_node *kn, struct kernfs_node *new_parent struct cgroup *cgrp = kn->priv; int ret; + /* do not accept '\n' to prevent making /proc/<pid>/cgroup unparsable */ + if (strchr(new_name_str, '\n')) + return -EINVAL; + if (kernfs_type(kn) != KERNFS_DIR) return -ENOTDIR; if (kn->parent != new_parent)
next reply other threads:[~2021-06-10 14:27 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-06-10 14:26 Tejun Heo [this message] 2021-06-10 14:26 ` [GIT PULL] cgroup fixes for v5.13-rc5 Tejun Heo 2021-06-10 19:18 ` pr-tracker-bot 2021-06-10 19:18 ` pr-tracker-bot-DgEjT+Ai2ygdnm+yROfE0A
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