* [PATCH AUTOSEL 4.14 07/12] proc: don't allow async path resolution of /proc/self components
[not found] <20201125153734.810826-1-sashal@kernel.org>
@ 2020-11-25 15:37 ` Sasha Levin
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From: Sasha Levin @ 2020-11-25 15:37 UTC (permalink / raw)
To: linux-kernel, stable; +Cc: Jens Axboe, Sasha Levin, linux-fsdevel
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(+)
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 */
--
2.27.0
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2020-11-25 15:37 ` [PATCH AUTOSEL 4.14 07/12] proc: don't allow async path resolution of /proc/self components Sasha Levin
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