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bpf: Test_verifier, #65 error message updates for trunc of boundary-cross 

After changes to add update_reg_bounds after ALU ops and 32-bit bounds
tracking truncation of boundary crossing range will fail earlier and with
a different error message. Now the test error trace is the following

11: (17) r1 -= 2147483584
12: R0_w=map_value(id=0,off=0,ks=8,vs=8,imm=0)
    R1_w=invP(id=0,smin_value=-2147483584,smax_value=63)
    R10=fp0 fp-8_w=mmmmmmmm
12: (17) r1 -= 2147483584
13: R0_w=map_value(id=0,off=0,ks=8,vs=8,imm=0)
    R1_w=invP(id=0,
              umin_value=18446744069414584448,umax_value=18446744071562068095,
              var_off=(0xffffffff00000000; 0xffffffff))
    R10=fp0 fp-8_w=mmmmmmmm
13: (77) r1 >>= 8
14: R0_w=map_value(id=0,off=0,ks=8,vs=8,imm=0)
    R1_w=invP(id=0,
              umin_value=72057594021150720,umax_value=72057594029539328,
              var_off=(0xffffffff000000; 0xffffff),
              s32_min_value=-16777216,s32_max_value=-1,
              u32_min_value=-16777216)
    R10=fp0 fp-8_w=mmmmmmmm
14: (0f) r0 += r1
value 72057594021150720 makes map_value pointer be out of bounds

Because we have 'umin_value == umax_value' instead of previously
where 'umin_value != umax_value' we can now fail earlier noting
that pointer addition is out of bounds.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/158560428103.10843.6316594510312781186.stgit@john-Precision-5820-Tower
This commit is contained in:
John Fastabend 2020-03-30 14:38:01 -07:00 committed by Alexei Starovoitov
parent 9ac26e9973
commit 32f13a5add
1 changed files with 4 additions and 8 deletions
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12
tools/testing/selftests/bpf/verifier/bounds.c
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@ -257,17 +257,15 @@
* [0x00ff'ffff'ff00'0000, 0x00ff'ffff'ffff'ffff]
*/
BPF_ALU64_IMM(BPF_RSH, BPF_REG_1, 8),
/* no-op or OOB pointer computation */
/* error on OOB pointer computation */
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
/* potentially OOB access */
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 0),
/* exit */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
/* not actually fully unbounded, but the bound is very high */
.errstr = "R0 unbounded memory access",
.errstr = "value 72057594021150720 makes map_value pointer be out of bounds",
.result = REJECT
},
{
@ -299,17 +297,15 @@
* [0x00ff'ffff'ff00'0000, 0x00ff'ffff'ffff'ffff]
*/
BPF_ALU64_IMM(BPF_RSH, BPF_REG_1, 8),
/* no-op or OOB pointer computation */
/* error on OOB pointer computation */
BPF_ALU64_REG(BPF_ADD, BPF_REG_0, BPF_REG_1),
/* potentially OOB access */
BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_0, 0),
/* exit */
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
.fixup_map_hash_8b = { 3 },
/* not actually fully unbounded, but the bound is very high */
.errstr = "R0 unbounded memory access",
.errstr = "value 72057594021150720 makes map_value pointer be out of bounds",
.result = REJECT
},
{