Files
container/Sources/CShim/openat2.c
T
Danny Canter 2bf2cedede Mount: Ensure symlinks stay scoped to rootfs (#559)
Today we don't resolve symlinks relative to the rootfs of the container
as ContainerizationOS.Mount did not handle this. This means trying to
mount something at /var/run (which typically is a symlink to /run in
most cases) would resolve to /run in the root of the VM. This change
adds some logic to handle this.

```
➜  ./bin/cctl run --kernel bin/kernel.arm64 --mount /Users/dcantah/foo:/var/run/foo bash
root@sandbox-vm:/# ls var/run/foo/
howdy
```
2026-02-25 14:29:34 -08:00

34 lines
955 B
C

/*
* Copyright © 2026 Apple Inc. and the Containerization project authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if defined(__linux__)
#include <sys/syscall.h>
#include <unistd.h>
#include "openat2.h"
#ifndef SYS_openat2
#define SYS_openat2 437
#endif
int CZ_openat2(int dirfd, const char *pathname, struct cz_open_how *how,
size_t size) {
return syscall(SYS_openat2, dirfd, pathname, how, size);
}
#endif