* Proposal: Allow mounting and bind mounting over symlinks – flag to not expand symlinks
@ 2021-09-03 21:39 Karolin Varner
0 siblings, 0 replies; only message in thread
From: Karolin Varner @ 2021-09-03 21:39 UTC (permalink / raw)
To: linux-fsdevel
Morning all!
I would like to propose adding a flag to the syscall underlying mount(2) that disables symlink expansion.
The motivating use case for this is as follows: I am trying to set up a netns namespace that requires a specific DNS setup,
to this end, I am creating a mount namespace and replacing /etc/resolve.conf. Unfortunately, resolv.conf is a symlink provided
by systemd-resolved. Bind mounting over said file with my replacement is impossible: With `-c` option, the `mount` command
actually targets `/etc/resolv.conf` instead of the file it's pointing to, but the kernel expands it internally and seems to
mount over the file being pointed to.
I highly similar use cases exist.
I have tried the nosymfollow option, which did not work. I think it affects only how symlinks are handled once the fs
is mounted.
Best,
Karolin Varner
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2021-09-03 21:39 Proposal: Allow mounting and bind mounting over symlinks – flag to not expand symlinks Karolin Varner
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