diff options
Diffstat (limited to 'sys/linux')
| -rw-r--r-- | sys/linux/bpf.txt | 32 | ||||
| -rw-r--r-- | sys/linux/test/bpf_helpers | 2 |
2 files changed, 28 insertions, 6 deletions
diff --git a/sys/linux/bpf.txt b/sys/linux/bpf.txt index ae84b0c5e..14a787782 100644 --- a/sys/linux/bpf.txt +++ b/sys/linux/bpf.txt @@ -397,11 +397,12 @@ bpf_framed_program { } [packed] bpf_program_ringbuf { - initr0 bpf_insn_init_r0 - reserve bpf_insn_ringbuf_reserve - body array[bpf_insn] - free bpf_insn_ringbuf_submit - exit bpf_insn_exit + initr0 bpf_insn_init_r0 + reserve bpf_insn_ringbuf_reserve + null_check bpf_insn_null_check[BPF_REG_9] + body array[bpf_insn] + free bpf_insn_ringbuf_submit + exit bpf_insn_exit } [packed] bpf_insn [ @@ -510,6 +511,17 @@ bpf_insn_jmp { imm flags[bpf_insn_immediates, int32] } +# Equivalent to: if reg != 0 goto +1; +type bpf_insn_not_null_jmp[REG] { + code_class const[BPF_JMP, int8:3] + code_s const[BPF_K0, int8:1] + code_op const[BPF_JNE0, int8:4] + dst const[REG, int8:4] + src const[0, int8:4] + off const[1, int16] + imm const[0, int32] +} + bpf_jmp_op = BPF_JA0, BPF_JEQ0, BPF_JGT0, BPF_JGE0, BPF_JSET0, BPF_JNE0, BPF_JSGT0, BPF_JSGE0, BPF_CALL0, BPF_EXIT0, BPF_JLT0, BPF_JLE0, BPF_JSLT0, BPF_JSLE0 define BPF_JA0 BPF_JA >> 4 @@ -675,6 +687,16 @@ bpf_insn_offsets = 0, 1, 2, 4, 6, 8, 12, 16, 24, 32, 48, 64, 80, 128, 256, -1, - bpf_insn_immediates = 0, 1, 4, 8, 16, -1, -4, -16 bpf_reg = BPF_REG_0, BPF_REG_1, BPF_REG_2, BPF_REG_3, BPF_REG_4, BPF_REG_5, BPF_REG_6, BPF_REG_7, BPF_REG_8, BPF_REG_9, BPF_REG_10, __MAX_BPF_REG +# Equivalent to: +# if reg != 0 goto +1; +# exit; +# This is useful to check null pointers. We exit if the pointer is null and +# continue the normal flow otherwise. +type bpf_insn_null_check[REG] { + cond_jump bpf_insn_not_null_jmp[REG] + exit bpf_insn_exit +} + type bpf_insn_mov_printk_str_hex[DST] [ # "%d " integer bpf_insn_mov_imm64[DST, 0x25702020, 0x20202000] diff --git a/sys/linux/test/bpf_helpers b/sys/linux/test/bpf_helpers index 598395ac2..9cd6682b9 100644 --- a/sys/linux/test/bpf_helpers +++ b/sys/linux/test/bpf_helpers @@ -25,4 +25,4 @@ r4 = bpf$PROG_LOAD(AUTO, &AUTO={0x3, AUTO, &AUTO=@framed={{AUTO, AUTO, AUTO, AUT r1 = bpf$MAP_CREATE_RINGBUF(AUTO, &AUTO={AUTO, AUTO, AUTO, 0x40000, AUTO, 0x0, 0x0, "00000000000000000000000000000000", 0x0, 0x0, 0x0, 0x0, 0x0, AUTO}, 0x48) -r2 = bpf$PROG_LOAD(AUTO, &AUTO={0x3, AUTO, &AUTO=@ringbuf={{AUTO, AUTO, AUTO, AUTO, 0x0, AUTO, AUTO, AUTO, 0x0}, {{AUTO, AUTO, AUTO, AUTO, r1, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}}, [], {{AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}}, {AUTO, AUTO, AUTO, AUTO}}, &AUTO='GPL\x00', 0x0, 0x0, 0x0, 0x0, 0x0, "00000000000000000000000000000000", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0xa0) +r2 = bpf$PROG_LOAD(AUTO, &AUTO={0x3, AUTO, &AUTO=@ringbuf={{AUTO, AUTO, AUTO, AUTO, 0x0, AUTO, AUTO, AUTO, 0x0}, {{AUTO, AUTO, AUTO, AUTO, r1, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}}, {{AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO}}, [], {{AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}}, {AUTO, AUTO, AUTO, AUTO}}, &AUTO='GPL\x00', 0x0, 0x0, 0x0, 0x0, 0x0, "00000000000000000000000000000000", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0xa0) |