diff options
author | David S. Miller <davem@davemloft.net> | 2017-05-11 19:30:02 -0700 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2017-05-11 19:48:58 -0700 |
commit | 6832a333ed4a7cc4fcb170c045d1d96d0976fdd4 (patch) | |
tree | 61befd17c5dbb8c91c1e5593a56f82b97da752c3 /tools | |
parent | 844cf763fba654436d3a4279b6a672c196cf1901 (diff) |
bpf: Handle multiple variable additions into packet pointers in verifier.
We must accumulate into reg->aux_off rather than use a plain assignment.
Add a test for this situation to test_align.
Reported-by: Alexei Starovoitov <ast@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools')
-rw-r--r-- | tools/testing/selftests/bpf/test_align.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/test_align.c b/tools/testing/selftests/bpf/test_align.c index ed242552e492..9644d4e069de 100644 --- a/tools/testing/selftests/bpf/test_align.c +++ b/tools/testing/selftests/bpf/test_align.c @@ -273,6 +273,20 @@ static struct bpf_align_test tests[] = { BPF_EXIT_INSN(), BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_5, 0), + /* Test multiple accumulations of unknown values + * into a packet pointer. + */ + BPF_MOV64_REG(BPF_REG_5, BPF_REG_2), + BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, 14), + BPF_ALU64_REG(BPF_ADD, BPF_REG_5, BPF_REG_6), + BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, 4), + BPF_ALU64_REG(BPF_ADD, BPF_REG_5, BPF_REG_6), + BPF_MOV64_REG(BPF_REG_4, BPF_REG_5), + BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 4), + BPF_JMP_REG(BPF_JGE, BPF_REG_3, BPF_REG_4, 1), + BPF_EXIT_INSN(), + BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_5, 0), + BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, @@ -314,6 +328,29 @@ static struct bpf_align_test tests[] = { * requirements. */ "23: R0=pkt(id=0,off=8,r=8) R1=ctx R2=pkt(id=0,off=0,r=8) R3=pkt_end R4=pkt(id=2,off=18,r=18),aux_off_align=4 R5=pkt(id=2,off=14,r=18),aux_off_align=4 R6=inv54,min_align=4 R10=fp", + + /* Constant offset is added to R5 packet pointer, + * resulting in reg->off value of 14. + */ + "26: R0=pkt(id=0,off=8,r=8) R1=ctx R2=pkt(id=0,off=0,r=8) R3=pkt_end R4=inv,aux_off_align=4 R5=pkt(id=0,off=14,r=8) R6=inv54,min_align=4 R10=fp", + /* Variable offset is added to R5, resulting in an + * auxiliary offset of 14, and an auxiliary alignment of 4. + */ + "27: R0=pkt(id=0,off=8,r=8) R1=ctx R2=pkt(id=0,off=0,r=8) R3=pkt_end R4=inv,aux_off_align=4 R5=pkt(id=3,off=0,r=0),aux_off=14,aux_off_align=4 R6=inv54,min_align=4 R10=fp", + /* Constant is added to R5 again, setting reg->off to 4. */ + "28: R0=pkt(id=0,off=8,r=8) R1=ctx R2=pkt(id=0,off=0,r=8) R3=pkt_end R4=inv,aux_off_align=4 R5=pkt(id=3,off=4,r=0),aux_off=14,aux_off_align=4 R6=inv54,min_align=4 R10=fp", + /* And once more we add a variable, which causes an accumulation + * of reg->off into reg->aux_off_align, with resulting value of + * 18. The auxiliary alignment stays at 4. + */ + "29: R0=pkt(id=0,off=8,r=8) R1=ctx R2=pkt(id=0,off=0,r=8) R3=pkt_end R4=inv,aux_off_align=4 R5=pkt(id=4,off=0,r=0),aux_off=18,aux_off_align=4 R6=inv54,min_align=4 R10=fp", + /* At the time the word size load is performed from R5, + * it's total offset is NET_IP_ALIGN + reg->off (0) + + * reg->aux_off (18) which is 20. Then the variable offset + * is considered using reg->aux_off_align which is 4 and meets + * the load's requirements. + */ + "33: R0=pkt(id=0,off=8,r=8) R1=ctx R2=pkt(id=0,off=0,r=8) R3=pkt_end R4=pkt(id=4,off=4,r=4),aux_off=18,aux_off_align=4 R5=pkt(id=4,off=0,r=4),aux_off=18,aux_off_align=4 R6=inv54,min_align=4 R10=fp", }, }, }; |