[pbs-devel] [PATCH proxmox-backup] add missing O_CLOEXEC flags to `openat` calls

[Fabian Grünbichler]

Reviewed-by: Fabian Grünbichler <f.gruenbichler at proxmox.com>

I wonder whether we want to have a helper/wrapper for this that ensures
we always set O_CLOEXEC? else it's quite easy for a new call to slip
through that is missing it.. OTOH, it would probably still be possible
to miss not using such a wrapper as well..

On November 29, 2024 4:39 pm, Dominik Csapak wrote:
> since we don't want to have lingering file descriptors on reload, which
> does a fork/exec.
> 
> Signed-off-by: Dominik Csapak <d.csapak at proxmox.com>
> ---
>  pbs-client/src/pxar/dir_stack.rs     | 2 +-
>  pbs-datastore/src/backup_info.rs     | 2 +-
>  pbs-datastore/src/snapshot_reader.rs | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/pbs-client/src/pxar/dir_stack.rs b/pbs-client/src/pxar/dir_stack.rs
> index 616d7545b..6fe55f170 100644
> --- a/pbs-client/src/pxar/dir_stack.rs
> +++ b/pbs-client/src/pxar/dir_stack.rs
> @@ -57,7 +57,7 @@ impl PxarDir {
>          let dir = Dir::openat(
>              parent,
>              self.file_name.as_os_str(),
> -            OFlag::O_DIRECTORY,
> +            OFlag::O_DIRECTORY | OFlag::O_CLOEXEC,
>              Mode::empty(),
>          )?;
>  
> diff --git a/pbs-datastore/src/backup_info.rs b/pbs-datastore/src/backup_info.rs
> index be262773b..1ca279aca 100644
> --- a/pbs-datastore/src/backup_info.rs
> +++ b/pbs-datastore/src/backup_info.rs
> @@ -143,7 +143,7 @@ impl BackupGroup {
>                  match openat(
>                      l2_fd,
>                      &manifest_path,
> -                    OFlag::O_RDONLY,
> +                    OFlag::O_RDONLY | OFlag::O_CLOEXEC,
>                      nix::sys::stat::Mode::empty(),
>                  ) {
>                      Ok(rawfd) => {
> diff --git a/pbs-datastore/src/snapshot_reader.rs b/pbs-datastore/src/snapshot_reader.rs
> index 95e59a421..dea51cbef 100644
> --- a/pbs-datastore/src/snapshot_reader.rs
> +++ b/pbs-datastore/src/snapshot_reader.rs
> @@ -102,7 +102,7 @@ impl SnapshotReader {
>          let raw_fd = nix::fcntl::openat(
>              self.locked_dir.as_raw_fd(),
>              Path::new(filename),
> -            nix::fcntl::OFlag::O_RDONLY,
> +            nix::fcntl::OFlag::O_RDONLY | nix::fcntl::OFlag::O_CLOEXEC,
>              nix::sys::stat::Mode::empty(),
>          )?;
>          let file = unsafe { File::from_raw_fd(raw_fd) };
> -- 
> 2.39.5
> 
> 
> 
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