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authorJens Axboe <axboe@kernel.dk>2020-11-14 02:47:52 +0300
committerJens Axboe <axboe@kernel.dk>2020-11-14 02:47:52 +0300
commit8d4c3e76e3be11a64df95ddee52e99092d42fc19 (patch)
tree869d04ae6fffbe045a0f48ec5afc2775953e9222 /fs/proc
parent88ec3211e46344a7d10cf6cb5045f839f7785f8e (diff)
downloadlinux-8d4c3e76e3be11a64df95ddee52e99092d42fc19.tar.xz
proc: don't allow async path resolution of /proc/self components
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>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/self.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/proc/self.c b/fs/proc/self.c
index 72cd69bcaf4a..cc71ce3466dc 100644
--- a/fs/proc/self.c
+++ b/fs/proc/self.c
@@ -16,6 +16,13 @@ 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);
/* max length of unsigned int in decimal + NULL term */