Allow bind-mounting pidfds. Similar to nsfs let's allow bind-mounts for
pidfds. This allows pidfds to be safely recovered and checked for
process recycling.
Instead of checking d_ops for both nsfs and pidfs we could in a
follow-up patch add a flag argument to struct dentry_operations that
functions similar to file_operations->fop_flags.
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
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Christian Brauner (2):
pidfs: allow bind-mounts
selftests: add pidfd bind-mount tests
fs/namespace.c | 10 +-
fs/pidfs.c | 2 +-
include/linux/pidfs.h | 1 +
tools/testing/selftests/pidfd/.gitignore | 1 +
tools/testing/selftests/pidfd/Makefile | 2 +-
tools/testing/selftests/pidfd/pidfd_bind_mount.c | 188 +++++++++++++++++++++++
6 files changed, 200 insertions(+), 4 deletions(-)
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base-commit: 16ecd47cb0cd895c7c2f5dd5db50f6c005c51639
change-id: 20241219-work-pidfs-mount-930f9899a1cd
