bpf/tests: Add exhaustive tests of BPF_ATOMIC register combinations

This patch adds tests of all register combinations for BPF_ATOMIC
operations on both BPF_W and BPF_DW sizes.

Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20211001130348.3670534-9-johan.almbladh@anyfinetworks.com
This commit is contained in:
Johan Almbladh 2021-10-01 15:03:46 +02:00 коммит произвёл Daniel Borkmann
Родитель daed6083f4
Коммит 6fae2e8a1d
1 изменённых файлов: 422 добавлений и 0 удалений

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@ -1805,6 +1805,246 @@ static int bpf_fill_cmpxchg32(struct bpf_test *self)
&__bpf_emit_cmpxchg32); &__bpf_emit_cmpxchg32);
} }
/*
* Test JITs that implement ATOMIC operations as function calls or
* other primitives, and must re-arrange operands for argument passing.
*/
static int __bpf_fill_atomic_reg_pairs(struct bpf_test *self, u8 width, u8 op)
{
struct bpf_insn *insn;
int len = 2 + 34 * 10 * 10;
u64 mem, upd, res;
int rd, rs, i = 0;
insn = kmalloc_array(len, sizeof(*insn), GFP_KERNEL);
if (!insn)
return -ENOMEM;
/* Operand and memory values */
if (width == BPF_DW) {
mem = 0x0123456789abcdefULL;
upd = 0xfedcba9876543210ULL;
} else { /* BPF_W */
mem = 0x01234567U;
upd = 0x76543210U;
}
/* Memory updated according to operation */
switch (op) {
case BPF_XCHG:
res = upd;
break;
case BPF_CMPXCHG:
res = mem;
break;
default:
__bpf_alu_result(&res, mem, upd, BPF_OP(op));
}
/* Test all operand registers */
for (rd = R0; rd <= R9; rd++) {
for (rs = R0; rs <= R9; rs++) {
u64 cmp, src;
/* Initialize value in memory */
i += __bpf_ld_imm64(&insn[i], R0, mem);
insn[i++] = BPF_STX_MEM(width, R10, R0, -8);
/* Initialize registers in order */
i += __bpf_ld_imm64(&insn[i], R0, ~mem);
i += __bpf_ld_imm64(&insn[i], rs, upd);
insn[i++] = BPF_MOV64_REG(rd, R10);
/* Perform atomic operation */
insn[i++] = BPF_ATOMIC_OP(width, op, rd, rs, -8);
if (op == BPF_CMPXCHG && width == BPF_W)
insn[i++] = BPF_ZEXT_REG(R0);
/* Check R0 register value */
if (op == BPF_CMPXCHG)
cmp = mem; /* Expect value from memory */
else if (R0 == rd || R0 == rs)
cmp = 0; /* Aliased, checked below */
else
cmp = ~mem; /* Expect value to be preserved */
if (cmp) {
insn[i++] = BPF_JMP32_IMM(BPF_JEQ, R0,
(u32)cmp, 2);
insn[i++] = BPF_MOV32_IMM(R0, __LINE__);
insn[i++] = BPF_EXIT_INSN();
insn[i++] = BPF_ALU64_IMM(BPF_RSH, R0, 32);
insn[i++] = BPF_JMP32_IMM(BPF_JEQ, R0,
cmp >> 32, 2);
insn[i++] = BPF_MOV32_IMM(R0, __LINE__);
insn[i++] = BPF_EXIT_INSN();
}
/* Check source register value */
if (rs == R0 && op == BPF_CMPXCHG)
src = 0; /* Aliased with R0, checked above */
else if (rs == rd && (op == BPF_CMPXCHG ||
!(op & BPF_FETCH)))
src = 0; /* Aliased with rd, checked below */
else if (op == BPF_CMPXCHG)
src = upd; /* Expect value to be preserved */
else if (op & BPF_FETCH)
src = mem; /* Expect fetched value from mem */
else /* no fetch */
src = upd; /* Expect value to be preserved */
if (src) {
insn[i++] = BPF_JMP32_IMM(BPF_JEQ, rs,
(u32)src, 2);
insn[i++] = BPF_MOV32_IMM(R0, __LINE__);
insn[i++] = BPF_EXIT_INSN();
insn[i++] = BPF_ALU64_IMM(BPF_RSH, rs, 32);
insn[i++] = BPF_JMP32_IMM(BPF_JEQ, rs,
src >> 32, 2);
insn[i++] = BPF_MOV32_IMM(R0, __LINE__);
insn[i++] = BPF_EXIT_INSN();
}
/* Check destination register value */
if (!(rd == R0 && op == BPF_CMPXCHG) &&
!(rd == rs && (op & BPF_FETCH))) {
insn[i++] = BPF_JMP_REG(BPF_JEQ, rd, R10, 2);
insn[i++] = BPF_MOV32_IMM(R0, __LINE__);
insn[i++] = BPF_EXIT_INSN();
}
/* Check value in memory */
if (rs != rd) { /* No aliasing */
i += __bpf_ld_imm64(&insn[i], R1, res);
} else if (op == BPF_XCHG) { /* Aliased, XCHG */
insn[i++] = BPF_MOV64_REG(R1, R10);
} else if (op == BPF_CMPXCHG) { /* Aliased, CMPXCHG */
i += __bpf_ld_imm64(&insn[i], R1, mem);
} else { /* Aliased, ALU oper */
i += __bpf_ld_imm64(&insn[i], R1, mem);
insn[i++] = BPF_ALU64_REG(BPF_OP(op), R1, R10);
}
insn[i++] = BPF_LDX_MEM(width, R0, R10, -8);
if (width == BPF_DW)
insn[i++] = BPF_JMP_REG(BPF_JEQ, R0, R1, 2);
else /* width == BPF_W */
insn[i++] = BPF_JMP32_REG(BPF_JEQ, R0, R1, 2);
insn[i++] = BPF_MOV32_IMM(R0, __LINE__);
insn[i++] = BPF_EXIT_INSN();
}
}
insn[i++] = BPF_MOV64_IMM(R0, 1);
insn[i++] = BPF_EXIT_INSN();
self->u.ptr.insns = insn;
self->u.ptr.len = i;
BUG_ON(i > len);
return 0;
}
/* 64-bit atomic register tests */
static int bpf_fill_atomic64_add_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_DW, BPF_ADD);
}
static int bpf_fill_atomic64_and_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_DW, BPF_AND);
}
static int bpf_fill_atomic64_or_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_DW, BPF_OR);
}
static int bpf_fill_atomic64_xor_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_DW, BPF_XOR);
}
static int bpf_fill_atomic64_add_fetch_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_DW, BPF_ADD | BPF_FETCH);
}
static int bpf_fill_atomic64_and_fetch_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_DW, BPF_AND | BPF_FETCH);
}
static int bpf_fill_atomic64_or_fetch_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_DW, BPF_OR | BPF_FETCH);
}
static int bpf_fill_atomic64_xor_fetch_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_DW, BPF_XOR | BPF_FETCH);
}
static int bpf_fill_atomic64_xchg_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_DW, BPF_XCHG);
}
static int bpf_fill_atomic64_cmpxchg_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_DW, BPF_CMPXCHG);
}
/* 32-bit atomic register tests */
static int bpf_fill_atomic32_add_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_W, BPF_ADD);
}
static int bpf_fill_atomic32_and_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_W, BPF_AND);
}
static int bpf_fill_atomic32_or_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_W, BPF_OR);
}
static int bpf_fill_atomic32_xor_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_W, BPF_XOR);
}
static int bpf_fill_atomic32_add_fetch_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_W, BPF_ADD | BPF_FETCH);
}
static int bpf_fill_atomic32_and_fetch_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_W, BPF_AND | BPF_FETCH);
}
static int bpf_fill_atomic32_or_fetch_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_W, BPF_OR | BPF_FETCH);
}
static int bpf_fill_atomic32_xor_fetch_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_W, BPF_XOR | BPF_FETCH);
}
static int bpf_fill_atomic32_xchg_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_W, BPF_XCHG);
}
static int bpf_fill_atomic32_cmpxchg_reg_pairs(struct bpf_test *self)
{
return __bpf_fill_atomic_reg_pairs(self, BPF_W, BPF_CMPXCHG);
}
/* /*
* Test the two-instruction 64-bit immediate load operation for all * Test the two-instruction 64-bit immediate load operation for all
* power-of-two magnitudes of the immediate operand. For each MSB, a block * power-of-two magnitudes of the immediate operand. For each MSB, a block
@ -11976,6 +12216,188 @@ static struct bpf_test tests[] = {
{ { 0, 1 } }, { { 0, 1 } },
.fill_helper = bpf_fill_ld_imm64, .fill_helper = bpf_fill_ld_imm64,
}, },
/* 64-bit ATOMIC register combinations */
{
"ATOMIC_DW_ADD: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic64_add_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_DW_AND: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic64_and_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_DW_OR: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic64_or_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_DW_XOR: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic64_xor_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_DW_ADD_FETCH: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic64_add_fetch_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_DW_AND_FETCH: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic64_and_fetch_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_DW_OR_FETCH: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic64_or_fetch_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_DW_XOR_FETCH: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic64_xor_fetch_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_DW_XCHG: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic64_xchg_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_DW_CMPXCHG: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic64_cmpxchg_reg_pairs,
.stack_depth = 8,
},
/* 32-bit ATOMIC register combinations */
{
"ATOMIC_W_ADD: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic32_add_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_W_AND: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic32_and_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_W_OR: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic32_or_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_W_XOR: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic32_xor_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_W_ADD_FETCH: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic32_add_fetch_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_W_AND_FETCH: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic32_and_fetch_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_W_OR_FETCH: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic32_or_fetch_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_W_XOR_FETCH: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic32_xor_fetch_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_W_XCHG: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic32_xchg_reg_pairs,
.stack_depth = 8,
},
{
"ATOMIC_W_CMPXCHG: register combinations",
{ },
INTERNAL,
{ },
{ { 0, 1 } },
.fill_helper = bpf_fill_atomic32_cmpxchg_reg_pairs,
.stack_depth = 8,
},
/* 64-bit ATOMIC magnitudes */ /* 64-bit ATOMIC magnitudes */
{ {
"ATOMIC_DW_ADD: all operand magnitudes", "ATOMIC_DW_ADD: all operand magnitudes",