On Thu, Oct 28, 2021 at 06:43:57PM +0200, Florent Revest wrote: > Allow the helper to be called from the perf_event_mmap hook. This is > convenient to lookup vma->vm_file and implement a similar logic as > perf_event_mmap_event in BPF. >From struct vm_area_struct: struct file * vm_file; /* File we map to (can be NULL). */ Under perf_event_mmap, vm_file won't be NULL or bpf_d_path can handle it? > > Signed-off-by: Florent Revest <revest@xxxxxxxxxxxx> > --- > kernel/trace/bpf_trace.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c > index cbcd0d6fca7c..f6e301c775a5 100644 > --- a/kernel/trace/bpf_trace.c > +++ b/kernel/trace/bpf_trace.c > @@ -922,6 +922,9 @@ BTF_ID(func, vfs_fallocate) > BTF_ID(func, dentry_open) > BTF_ID(func, vfs_getattr) > BTF_ID(func, filp_close) > +#ifdef CONFIG_PERF_EVENTS > +BTF_ID(func, perf_event_mmap) > +#endif > BTF_SET_END(btf_allowlist_d_path) > > static bool bpf_d_path_allowed(const struct bpf_prog *prog) > -- > 2.33.0.1079.g6e70778dc9-goog >
