bpf: Add open-coded style process file iterator and bpf_fget_task() kfunc #8101
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
![kernel-patches-daemon-bpf[bot]](https://avatars.githubusercontent.com/u/70728002?s=60&v=4){kind=small}
|
Upstream branch: 2c8b09a |
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
6c2b6b1 to
17914af
Compare
|
Upstream branch: 2c8b09a |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/911034=>bpf-next
branch
from
c08aebb to
63cb5f9
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
17914af to
09004f4
Compare
|
Upstream branch: 2c8b09a |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/911034=>bpf-next
branch
from
63cb5f9 to
d312183
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
09004f4 to
d499e8b
Compare
|
Upstream branch: fc39fb5 |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/911034=>bpf-next
branch
from
d312183 to
b77bfa1
Compare
kernel-patches-daemon-bpf
bot
force-pushed
the
bpf-next_base
branch
from
d499e8b to
251b2b6
Compare
This patch adds the open-coded iterator style process file iterator
kfuncs bpf_iter_task_file_{new,next,destroy} that iterates over all
files opened by the specified process.
bpf_iter_task_file_next returns a pointer to bpf_iter_task_file_item,
which currently contains *task, *file, fd. This is an extensible
structure that enables compatibility with different versions
through CO-RE.
The reference to struct file acquired by the previous
bpf_iter_task_file_next() is released in the next
bpf_iter_task_file_next(), and the last reference is released in the
last bpf_iter_task_file_next() that returns NULL.
In the bpf_iter_task_file_destroy(), if the iterator does not iterate to
the end, then the last struct file reference is released at this time.
Signed-off-by: Juntong Deng <[email protected]>
This patch adds test cases for open-coded style process file iterator. Test cases related to process files are run in the newly created child process. Close all opened files inherited from the parent process in the child process to avoid the files opened by the parent process affecting the test results. In addition, this patch adds failure test cases where bpf programs cannot pass the verifier due to uninitialized or untrusted arguments, or not in RCU CS, etc. Signed-off-by: Juntong Deng <[email protected]>
This patch adds bpf_fget_task() kfunc. bpf_fget_task() is used to get a pointer to the struct file corresponding to the task file descriptor. Note that this function acquires a reference to struct file. Signed-off-by: Juntong Deng <[email protected]>
Currently fs kfuncs are only available for LSM program type, but fs kfuncs are generic and useful for scenarios other than LSM. This patch makes fs kfuncs available for SYSCALL and TRACING program types. Signed-off-by: Juntong Deng <[email protected]>
This patch adds test cases for bpf_fget_task() kfunc. test_bpf_fget_task is used to test obtaining struct file based on the file descriptor in the current process. bpf_fget_task_null_task and bpf_fget_task_untrusted_task are used to test the failure cases of passing NULL or untrusted pointer as argument. Signed-off-by: Juntong Deng <[email protected]>
|
Upstream branch: fc39fb5 |
kernel-patches-daemon-bpf
bot
force-pushed
the
series/911034=>bpf-next
branch
from
b77bfa1 to
4e69be8
Compare
|
At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=911034 expired. Closing PR. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Pull request for series with
subject: bpf: Add open-coded style process file iterator and bpf_fget_task() kfunc
version: 4
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=911034