diff mbox series

[4.14,20/50] proc: dont allow async path resolution of /proc/self components

Message ID 20201201084647.650735416@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH Dec. 1, 2020, 8:53 a.m. UTC 
From: Jens Axboe <axboe@kernel.dk>

[ Upstream commit 8d4c3e76e3be11a64df95ddee52e99092d42fc19 ]

If this is attempted by a kthread, then return -EOPNOTSUPP as we don't
currently support that. Once we can get task_pid_ptr() doing the right
thing, then this can go away again.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/proc/self.c | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/fs/proc/self.c b/fs/proc/self.c
index 398cdf9a9f0c6..eba167e1700ef 100644
--- a/fs/proc/self.c
+++ b/fs/proc/self.c
@@ -15,6 +15,13 @@  static const char *proc_self_get_link(struct dentry *dentry,
 	pid_t tgid = task_tgid_nr_ns(current, ns);
 	char *name;
 
+	/*
+	 * Not currently supported. Once we can inherit all of struct pid,
+	 * we can allow this.
+	 */
+	if (current->flags & PF_KTHREAD)
+		return ERR_PTR(-EOPNOTSUPP);
+
 	if (!tgid)
 		return ERR_PTR(-ENOENT);
 	/* 11 for max length of signed int in decimal + NULL term */