mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-29 05:44:11 +00:00
45df305268
Atomic tests store a DW, but then load it back as a W from the same
address. This doesn't work on big-endian systems, and since the point
of those tests is not testing narrow loads, fix simply by loading a
DW.
Fixes: 98d666d05a ("bpf: Add tests for new BPF atomic operations")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210210020713.77911-1-iii@linux.ibm.com
77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
{
|
|
"BPF_ATOMIC XOR without fetch",
|
|
.insns = {
|
|
/* val = 0x110; */
|
|
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0x110),
|
|
/* atomic_xor(&val, 0x011); */
|
|
BPF_MOV64_IMM(BPF_REG_1, 0x011),
|
|
BPF_ATOMIC_OP(BPF_DW, BPF_XOR, BPF_REG_10, BPF_REG_1, -8),
|
|
/* if (val != 0x101) exit(2); */
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0x101, 2),
|
|
BPF_MOV64_IMM(BPF_REG_0, 2),
|
|
BPF_EXIT_INSN(),
|
|
/* r1 should not be clobbered, no BPF_FETCH flag */
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0x011, 1),
|
|
BPF_MOV64_IMM(BPF_REG_0, 1),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
|
"BPF_ATOMIC XOR with fetch",
|
|
.insns = {
|
|
BPF_MOV64_IMM(BPF_REG_0, 123),
|
|
/* val = 0x110; */
|
|
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0x110),
|
|
/* old = atomic_fetch_xor(&val, 0x011); */
|
|
BPF_MOV64_IMM(BPF_REG_1, 0x011),
|
|
BPF_ATOMIC_OP(BPF_DW, BPF_XOR | BPF_FETCH, BPF_REG_10, BPF_REG_1, -8),
|
|
/* if (old != 0x110) exit(3); */
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0x110, 2),
|
|
BPF_MOV64_IMM(BPF_REG_0, 3),
|
|
BPF_EXIT_INSN(),
|
|
/* if (val != 0x101) exit(2); */
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_10, -8),
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0x101, 2),
|
|
BPF_MOV64_IMM(BPF_REG_1, 2),
|
|
BPF_EXIT_INSN(),
|
|
/* Check R0 wasn't clobbered (fxor fear of x86 JIT bug) */
|
|
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 123, 2),
|
|
BPF_MOV64_IMM(BPF_REG_0, 1),
|
|
BPF_EXIT_INSN(),
|
|
/* exit(0); */
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.result = ACCEPT,
|
|
},
|
|
{
|
|
"BPF_ATOMIC XOR with fetch 32bit",
|
|
.insns = {
|
|
/* r0 = (s64) -1 */
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_ALU64_IMM(BPF_SUB, BPF_REG_0, 1),
|
|
/* val = 0x110; */
|
|
BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 0x110),
|
|
/* old = atomic_fetch_xor(&val, 0x011); */
|
|
BPF_MOV32_IMM(BPF_REG_1, 0x011),
|
|
BPF_ATOMIC_OP(BPF_W, BPF_XOR | BPF_FETCH, BPF_REG_10, BPF_REG_1, -4),
|
|
/* if (old != 0x110) exit(3); */
|
|
BPF_JMP32_IMM(BPF_JEQ, BPF_REG_1, 0x110, 2),
|
|
BPF_MOV32_IMM(BPF_REG_0, 3),
|
|
BPF_EXIT_INSN(),
|
|
/* if (val != 0x101) exit(2); */
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_10, -4),
|
|
BPF_JMP32_IMM(BPF_JEQ, BPF_REG_1, 0x101, 2),
|
|
BPF_MOV32_IMM(BPF_REG_1, 2),
|
|
BPF_EXIT_INSN(),
|
|
/* Check R0 wasn't clobbered (fxor fear of x86 JIT bug)
|
|
* It should be -1 so add 1 to get exit code.
|
|
*/
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 1),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.result = ACCEPT,
|
|
},
|