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[bpf-next] bpf/selftests: Use parent instead of last_wakee in task kfunc test

Message ID 20221212235344.1563280-1-void@manifault.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series [bpf-next] bpf/selftests: Use parent instead of last_wakee in task kfunc test | expand

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Context Check Description
netdev/tree_selection success Clearly marked for bpf-next
netdev/fixes_present success Fixes tag not required for -next series
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netdev/cover_letter success Single patches do not need cover letters
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 4 maintainers not CCed: linux-kselftest@vger.kernel.org shuah@kernel.org yhs@fb.com mykolal@fb.com
netdev/build_clang success Errors and warnings before: 0 this patch: 0
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netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
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Commit Message

David Vernet Dec. 12, 2022, 11:53 p.m. UTC 
Commit fe147956fca4 ("bpf/selftests: Add selftests for new task kfuncs")
added a negative selftest called task_kfunc_acquire_trusted_walked which
ensures that a BPF program that gets a struct task_struct * pointer from
walking a struct is properly rejected by the verifier if it tries to
pass that pointer to a task kfunc. In order to do this, it uses
task->last_wakee, but unfortunately that's not defined on UP builds.
Just use task->parent instead.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: fe147956fca4 ("bpf/selftests: Add selftests for new task kfuncs")
Signed-off-by: David Vernet <void@manifault.com>
---
 tools/testing/selftests/bpf/progs/task_kfunc_failure.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/task_kfunc_failure.c b/tools/testing/selftests/bpf/progs/task_kfunc_failure.c
index 87fa1db9d9b5..60508c20041f 100644
--- a/tools/testing/selftests/bpf/progs/task_kfunc_failure.c
+++ b/tools/testing/selftests/bpf/progs/task_kfunc_failure.c
@@ -73,7 +73,7 @@  int BPF_PROG(task_kfunc_acquire_trusted_walked, struct task_struct *task, u64 cl
 	struct task_struct *acquired;
 
 	/* Can't invoke bpf_task_acquire() on a trusted pointer obtained from walking a struct. */
-	acquired = bpf_task_acquire(task->last_wakee);
+	acquired = bpf_task_acquire(task->parent);
 	bpf_task_release(acquired);
 
 	return 0;