diff options
| author | Jens Axboe <axboe@kernel.dk> | 2020-11-13 16:47:52 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-02 08:29:27 +0100 |
| commit | ebb83fd9dbd29d844c553d28565b5f86e47790e0 (patch) | |
| tree | 80366136a7b9732d4c04b734ff28eee570900bc1 /fs | |
| parent | 22aaeaeeccaf8c4344bfc7910d797ac1b169e7e6 (diff) | |
proc: don't allow async path resolution of /proc/self components
[ 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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/proc/self.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/proc/self.c b/fs/proc/self.c index 2dcc2558b3aa..dffbe533d53f 100644 --- a/fs/proc/self.c +++ b/fs/proc/self.c @@ -24,6 +24,13 @@ static const char *proc_self_follow_link(struct dentry *dentry, void **cookie) 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 */ |