Can't exec into a container with private time namespace

[lifubang]

Description

When we exec into a container with a private time namespace, it will get an error.

Steps to reproduce the issue

1. Create a container with a private time namespace;
2. Exec into this container;
3. We will always get an error.

Describe the results you received and expected

@lifubang ➜ ~/ubuntu $ sudo ./runc.amd64 run -d test
@lifubang ➜ ~/ubuntu $ sudo ./runc.amd64 exec test true
FATA[0000] nsexec-0[10598]: failed to update /proc/10599/timens_offsets: Permission denied
FATA[0000] nsexec-1[10599]: failed to sync with parent: read(SYNC_TIMEOFFSETS_ACK): Success
ERRO[0000] exec failed: unable to start container process: error executing setns process: exit status 1

What version of runc are you using?

runc version 1.2.5
commit: v1.2.5-0-g59923ef1
spec: 1.2.0
go: go1.22.12
libseccomp: 2.5.5

Host OS information

No response

Host kernel information

No response