diff options
| author | Song Liu <song@kernel.org> | 2022-09-26 11:47:38 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-09-26 20:40:43 -0700 |
| commit | 19c02415da2345d0dda2b5c4495bc17cc14b18b5 (patch) | |
| tree | 64cebe945349bf772b0d4cdb212ee1fc55d38215 /include/linux/filter.h | |
| parent | 30b8fdbbe31b2422f46fcd6d3960e563affe76d7 (diff) | |
bpf: use bpf_prog_pack for bpf_dispatcher
Allocate bpf_dispatcher with bpf_prog_pack_alloc so that bpf_dispatcher
can share pages with bpf programs.
arch_prepare_bpf_dispatcher() is updated to provide a RW buffer as working
area for arch code to write to.
This also fixes CPA W^X warnning like:
CPA refuse W^X violation: 8000000000000163 -> 0000000000000163 range: ...
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20220926184739.3512547-2-song@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux/filter.h')
| -rw-r--r-- | include/linux/filter.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h index 98e28126c24b..efc42a6e3aed 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -1023,6 +1023,8 @@ extern long bpf_jit_limit_max; typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size); +void bpf_jit_fill_hole_with_zero(void *area, unsigned int size); + struct bpf_binary_header * bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, unsigned int alignment, @@ -1035,6 +1037,9 @@ void bpf_jit_free(struct bpf_prog *fp); struct bpf_binary_header * bpf_jit_binary_pack_hdr(const struct bpf_prog *fp); +void *bpf_prog_pack_alloc(u32 size, bpf_jit_fill_hole_t bpf_fill_ill_insns); +void bpf_prog_pack_free(struct bpf_binary_header *hdr); + static inline bool bpf_prog_kallsyms_verify_off(const struct bpf_prog *fp) { return list_empty(&fp->aux->ksym.lnode) || |