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authorJens Axboe <axboe@kernel.dk>2020-09-19 05:13:06 +0300
committerJens Axboe <axboe@kernel.dk>2020-10-01 05:32:32 +0300
commit9b8284921513fc1ea57d87777283a59b05862f03 (patch)
treee9189b99746af8e30db89f81b025fd1d7e282431 /fs/io-wq.c
parent0f2122045b946241a9e549c2a76cea54fa58a7ff (diff)
downloadlinux-9b8284921513fc1ea57d87777283a59b05862f03.tar.xz
io_uring: reference ->nsproxy for file table commands
If we don't get and assign the namespace for the async work, then certain paths just don't work properly (like /dev/stdin, /proc/mounts, etc). Anything that references the current namespace of the given task should be assigned for async work on behalf of that task. Cc: stable@vger.kernel.org # v5.5+ Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io-wq.c')
-rw-r--r--fs/io-wq.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/io-wq.c b/fs/io-wq.c
index 414beb543883..09e20bbf0d37 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -60,6 +60,7 @@ struct io_worker {
const struct cred *cur_creds;
const struct cred *saved_creds;
struct files_struct *restore_files;
+ struct nsproxy *restore_nsproxy;
struct fs_struct *restore_fs;
};
@@ -153,6 +154,7 @@ static bool __io_worker_unuse(struct io_wqe *wqe, struct io_worker *worker)
task_lock(current);
current->files = worker->restore_files;
+ current->nsproxy = worker->restore_nsproxy;
task_unlock(current);
}
@@ -318,6 +320,7 @@ static void io_worker_start(struct io_wqe *wqe, struct io_worker *worker)
worker->flags |= (IO_WORKER_F_UP | IO_WORKER_F_RUNNING);
worker->restore_files = current->files;
+ worker->restore_nsproxy = current->nsproxy;
worker->restore_fs = current->fs;
io_wqe_inc_running(wqe, worker);
}
@@ -454,6 +457,7 @@ static void io_impersonate_work(struct io_worker *worker,
if (work->files && current->files != work->files) {
task_lock(current);
current->files = work->files;
+ current->nsproxy = work->nsproxy;
task_unlock(current);
}
if (work->fs && current->fs != work->fs)