v1->v2: - reworded 2nd patch. It's a real dead lock. Not a false positive - dropped the lockdep fix for up_read_non_owner in bpf_get_stackid
In addition to preempt_disable patch for socket filters https://patchwork.ozlabs.org/patch/1032437/ First patch fixes lockdep false positive in percpu_freelist Second patch fixes potential deadlock in bpf_prog_register Third patch fixes another potential deadlock in stackmap access from tracing bpf prog and from syscall. Alexei Starovoitov (2): bpf: fix lockdep false positive in percpu_freelist bpf: fix potential deadlock in bpf_prog_register Martin KaFai Lau (1): bpf: Fix syscall's stackmap lookup potential deadlock kernel/bpf/hashtab.c | 4 ++-- kernel/bpf/percpu_freelist.c | 41 +++++++++++++++++++++++++----------- kernel/bpf/percpu_freelist.h | 4 ++++ kernel/bpf/syscall.c | 12 +++++++++-- kernel/trace/bpf_trace.c | 14 ++---------- 5 files changed, 47 insertions(+), 28 deletions(-) -- 2.20.0
