kernel/tools/testing/selftests/bpf/progs/local_storage.c, branch linux-6.2.y

selftests/bpf: Test for associating multiple elements with the local storage

2022-03-21T01:55:05Z

This patch adds a few calls to the existing local storage selftest to test that we can associate multiple elements with the local storage. The sleepable program's call to bpf_sk_storage_get with sk_storage_map2 will lead to an allocation of a new selem under the GFP_KERNEL flag. Signed-off-by: Joanne Koong Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20220318045553.3091807-3-joannekoong@fb.com

bpf/selftests: Update local storage selftest for sleepable programs

2021-12-30T01:54:40Z

Remove the spin lock logic and update the selftests to use sleepable programs to use a mix of sleepable and non-sleepable programs. It's more useful to test the sleepable programs since the tests don't really need spinlocks. Signed-off-by: KP Singh Signed-off-by: Alexei Starovoitov Acked-by: Martin KaFai Lau Link: https://lore.kernel.org/bpf/20211224152916.1550677-3-kpsingh@kernel.org

bpf: Update local storage test to check handling of null ptrs

2021-01-12T15:07:57Z

It was found in [1] that bpf_inode_storage_get helper did not check the nullness of the passed owner ptr which caused an oops when dereferenced. This change incorporates the example suggested in [1] into the local storage selftest. The test is updated to create a temporary directory instead of just using a tempfile. In order to replicate the issue this copied rm binary is renamed tiggering the inode_rename with a null pointer for the new_inode. The logic to verify the setting and deletion of the inode local storage of the old inode is also moved to this LSM hook. The change also removes the copy_rm function and simply shells out to copy files and recursively delete directories and consolidates the logic of setting the initial inode storage to the bprm_committed_creds hook and removes the file_open hook. [1]: https://lore.kernel.org/bpf/CANaYP3HWkH91SN=wTNO9FL_2ztHfqcXKX38SSE-JJ2voh+vssw@mail.gmail.com Suggested-by: Gilad Reti Signed-off-by: KP Singh Signed-off-by: Daniel Borkmann Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20210112075525.256820-2-kpsingh@kernel.org

bpf: Add tests for task_local_storage

2020-11-06T16:08:38Z

The test exercises the syscall based map operations by creating a pidfd for the current process. For verifying kernel / LSM functionality, the test implements a simple MAC policy which denies an executable from unlinking itself. The LSM program bprm_committed_creds sets a task_local_storage with a pointer to the inode. This is then used to detect if the task is trying to unlink itself in the inode_unlink LSM hook. The test copies /bin/rm to /tmp and executes it in a child thread with the intention of deleting itself. A successful test should prevent the the running executable from deleting itself. The bpf programs are also updated to call bpf_spin_{lock, unlock} to trigger the verfier checks for spin locks. The temporary file is cleaned up later in the test. Signed-off-by: KP Singh Signed-off-by: Alexei Starovoitov Acked-by: Martin KaFai Lau Link: https://lore.kernel.org/bpf/20201106103747.2780972-9-kpsingh@chromium.org

bpf: Update selftests for local_storage to use vmlinux.h

2020-11-06T16:08:37Z

With the fixing of BTF pruning of embedded types being fixed, the test can be simplified to use vmlinux.h Signed-off-by: KP Singh Signed-off-by: Alexei Starovoitov Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20201106103747.2780972-8-kpsingh@chromium.org

bpf: Fix tests for local_storage

2020-11-06T16:08:37Z

The {inode,sk}_storage_result checking if the correct value was retrieved was being clobbered unconditionally by the return value of the bpf_{inode,sk}_storage_delete call. Also, consistently use the newly added BPF_LOCAL_STORAGE_GET_F_CREATE flag. Fixes: cd324d7abb3d ("bpf: Add selftests for local_storage") Signed-off-by: KP Singh Signed-off-by: Alexei Starovoitov Acked-by: Song Liu Link: https://lore.kernel.org/bpf/20201106103747.2780972-7-kpsingh@chromium.org

bpf: Add selftests for local_storage

2020-08-25T22:00:04Z

inode_local_storage: * Hook to the file_open and inode_unlink LSM hooks. * Create and unlink a temporary file. * Store some information in the inode's bpf_local_storage during file_open. * Verify that this information exists when the file is unlinked. sk_local_storage: * Hook to the socket_post_create and socket_bind LSM hooks. * Open and bind a socket and set the sk_storage in the socket_post_create hook using the start_server helper. * Verify if the information is set in the socket_bind hook. Signed-off-by: KP Singh Signed-off-by: Alexei Starovoitov Acked-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20200825182919.1118197-8-kpsingh@chromium.org