Christian Brauner
060628d332
The bprm_check_security and file_mprotect hooks currently fetch the file
pointer with BPF_CORE_READ_INTO(), i.e. bpf_probe_read_kernel(). That
hands us back a plain scalar and since 1a5c01d2508a ("bpf: Make
KF_TRUSTED_ARGS the default for all kfuncs") in v7.0 such a pointer can't
be passed to a kfunc at all.
Dereference the fields directly instead. Both bprm->file and vma->vm_file
are in the verifier's BTF_TYPE_SAFE_TRUSTED(_OR_NULL) lists so the loads
give us PTR_TRUSTED registers, and vmlinux.h pushes preserve_access_index
for all records so we don't lose CO-RE.
No functional changes. This is just so we can hand the pointers to the
bpf_real_data_inode() kfunc in the next patch.
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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