Changes v1 => v2: 1. Update arch_prepare_bpf_dispatcher to use a RO image and a RW buffer. (Alexei) Note: I haven't found an existing test to cover this part, so this part was tested manually (comparing the generated dispatcher is the same). Jeff Layton reported CPA W^X warning linux-next [1]. It turns out to be W^X issue with bpf trampoline and bpf dispatcher. Fix these by: 1. Use bpf_prog_pack for bpf_dispatcher; 2. Set memory permission properly with bpf trampoline. [1] https://lore.kernel.org/lkml/c84cc27c1a5031a003039748c3c099732a718aec.camel@xxxxxxxxxx/ Song Liu (2): bpf: use bpf_prog_pack for bpf_dispatcher bpf: Enforce W^X for bpf trampoline arch/x86/net/bpf_jit_comp.c | 16 ++++++++-------- include/linux/bpf.h | 4 ++-- include/linux/filter.h | 5 +++++ kernel/bpf/core.c | 9 +++++++-- kernel/bpf/dispatcher.c | 27 +++++++++++++++++++++------ kernel/bpf/trampoline.c | 22 +++++----------------- 6 files changed, 48 insertions(+), 35 deletions(-) -- 2.30.2
