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20c09d92fa
The life time of certain kernel structures like 'struct cgroup' is protected by RCU.
Hence it's safe to dereference them directly from __kptr tagged pointers in bpf maps.
The resulting pointer is MEM_RCU and can be passed to kfuncs that expect KF_RCU.
Derefrence of other kptr-s returns PTR_UNTRUSTED.
For example:
struct map_value {
struct cgroup __kptr *cgrp;
};
SEC("tp_btf/cgroup_mkdir")
int BPF_PROG(test_cgrp_get_ancestors, struct cgroup *cgrp_arg, const char *path)
{
struct cgroup *cg, *cg2;
cg = bpf_cgroup_acquire(cgrp_arg); // cg is PTR_TRUSTED and ref_obj_id > 0
bpf_kptr_xchg(&v->cgrp, cg);
cg2 = v->cgrp; // This is new feature introduced by this patch.
// cg2 is PTR_MAYBE_NULL | MEM_RCU.
// When cg2 != NULL, it's a valid cgroup, but its percpu_ref could be zero
if (cg2)
bpf_cgroup_ancestor(cg2, level); // safe to do.
}
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/bpf/20230303041446.3630-4-alexei.starovoitov@gmail.com
470 lines
15 KiB
C
470 lines
15 KiB
C
/* Common tests */
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{
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"map_kptr: BPF_ST imm != 0",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = REJECT,
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.errstr = "BPF_ST imm must be 0 when storing to kptr at off=0",
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},
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{
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"map_kptr: size != bpf_size_to_bytes(BPF_DW)",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_ST_MEM(BPF_W, BPF_REG_0, 0, 0),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = REJECT,
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.errstr = "kptr access size must be BPF_DW",
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},
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{
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"map_kptr: map_value non-const var_off",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_MOV64_REG(BPF_REG_3, BPF_REG_0),
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BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 0, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_2, 0),
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BPF_JMP_IMM(BPF_JLE, BPF_REG_2, 4, 1),
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BPF_EXIT_INSN(),
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BPF_JMP_IMM(BPF_JGE, BPF_REG_2, 0, 1),
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BPF_EXIT_INSN(),
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BPF_ALU64_REG(BPF_ADD, BPF_REG_3, BPF_REG_2),
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_3, 0),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = REJECT,
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.errstr = "kptr access cannot have variable offset",
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},
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{
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"map_kptr: bpf_kptr_xchg non-const var_off",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_MOV64_REG(BPF_REG_3, BPF_REG_0),
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BPF_LDX_MEM(BPF_DW, BPF_REG_2, BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_2, 0, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_2, 0),
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BPF_JMP_IMM(BPF_JLE, BPF_REG_2, 4, 1),
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BPF_EXIT_INSN(),
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BPF_JMP_IMM(BPF_JGE, BPF_REG_2, 0, 1),
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BPF_EXIT_INSN(),
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BPF_ALU64_REG(BPF_ADD, BPF_REG_3, BPF_REG_2),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_3),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_kptr_xchg),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = REJECT,
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.errstr = "R1 doesn't have constant offset. kptr has to be at the constant offset",
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},
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{
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"map_kptr: unaligned boundary load/store",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 7),
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BPF_ST_MEM(BPF_DW, BPF_REG_0, 0, 0),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = REJECT,
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.errstr = "kptr access misaligned expected=0 off=7",
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},
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{
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"map_kptr: reject var_off != 0",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1, 0),
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BPF_JMP_IMM(BPF_JLE, BPF_REG_2, 4, 1),
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BPF_EXIT_INSN(),
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BPF_JMP_IMM(BPF_JGE, BPF_REG_2, 0, 1),
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BPF_EXIT_INSN(),
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BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_2),
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BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = REJECT,
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.errstr = "variable untrusted_ptr_ access var_off=(0x0; 0x7) disallowed",
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},
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/* Tests for unreferened PTR_TO_BTF_ID */
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{
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"map_kptr: unref: reject btf_struct_ids_match == false",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 1),
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BPF_EXIT_INSN(),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 4),
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BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = REJECT,
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.errstr = "invalid kptr access, R1 type=untrusted_ptr_prog_test_ref_kfunc expected=ptr_prog_test",
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},
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{
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"map_kptr: unref: loaded pointer marked as untrusted",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = REJECT,
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.errstr = "R0 invalid mem access 'untrusted_ptr_or_null_'",
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},
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{
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"map_kptr: unref: correct in kernel type size",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 32),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = REJECT,
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.errstr = "access beyond struct prog_test_ref_kfunc at off 32 size 8",
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},
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{
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"map_kptr: unref: inherit PTR_UNTRUSTED on struct walk",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 16),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_this_cpu_ptr),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = REJECT,
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.errstr = "R1 type=untrusted_ptr_ expected=percpu_ptr_",
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},
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{
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"map_kptr: unref: no reference state created",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = ACCEPT,
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},
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{
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"map_kptr: unref: bpf_kptr_xchg rejected",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_kptr_xchg),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = REJECT,
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.errstr = "off=0 kptr isn't referenced kptr",
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},
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{
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"map_kptr: unref: bpf_kfunc_call_test_kptr_get rejected",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
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BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
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BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
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BPF_EXIT_INSN(),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
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BPF_MOV64_IMM(BPF_REG_2, 0),
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BPF_MOV64_IMM(BPF_REG_3, 0),
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BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.prog_type = BPF_PROG_TYPE_SCHED_CLS,
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.fixup_map_kptr = { 1 },
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.result = REJECT,
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.errstr = "arg#0 no referenced kptr at map value offset=0",
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.fixup_kfunc_btf_id = {
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{ "bpf_kfunc_call_test_kptr_get", 13 },
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}
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},
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/* Tests for referenced PTR_TO_BTF_ID */
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{
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"map_kptr: ref: loaded pointer marked as untrusted",
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.insns = {
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BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
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BPF_LD_MAP_FD(BPF_REG_6, 0),
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BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_IMM(BPF_REG_1, 0),
|
|
BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_0, 8),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_this_cpu_ptr),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.fixup_map_kptr = { 1 },
|
|
.result = REJECT,
|
|
.errstr = "R1 type=rcu_ptr_or_null_ expected=percpu_ptr_",
|
|
},
|
|
{
|
|
"map_kptr: ref: reject off != 0",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
|
|
BPF_LD_MAP_FD(BPF_REG_6, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
|
|
BPF_MOV64_IMM(BPF_REG_2, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_kptr_xchg),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_kptr_xchg),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.fixup_map_kptr = { 1 },
|
|
.result = REJECT,
|
|
.errstr = "invalid kptr access, R2 type=ptr_prog_test_ref_kfunc expected=ptr_prog_test_member",
|
|
},
|
|
{
|
|
"map_kptr: ref: reference state created and released on xchg",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
|
|
BPF_LD_MAP_FD(BPF_REG_6, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
|
|
BPF_ST_MEM(BPF_DW, BPF_REG_1, 0, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, BPF_PSEUDO_KFUNC_CALL, 0, 0),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_kptr_xchg),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.fixup_map_kptr = { 1 },
|
|
.result = REJECT,
|
|
.errstr = "Unreleased reference id=5 alloc_insn=20",
|
|
.fixup_kfunc_btf_id = {
|
|
{ "bpf_kfunc_call_test_acquire", 15 },
|
|
}
|
|
},
|
|
{
|
|
"map_kptr: ref: reject STX",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
|
|
BPF_LD_MAP_FD(BPF_REG_6, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_1, 0),
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 8),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.fixup_map_kptr = { 1 },
|
|
.result = REJECT,
|
|
.errstr = "store to referenced kptr disallowed",
|
|
},
|
|
{
|
|
"map_kptr: ref: reject ST",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
|
|
BPF_LD_MAP_FD(BPF_REG_6, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_ST_MEM(BPF_DW, BPF_REG_0, 8, 0),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.fixup_map_kptr = { 1 },
|
|
.result = REJECT,
|
|
.errstr = "store to referenced kptr disallowed",
|
|
},
|
|
{
|
|
"map_kptr: reject helper access to kptr",
|
|
.insns = {
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
|
|
BPF_LD_MAP_FD(BPF_REG_6, 0),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4),
|
|
BPF_MOV64_IMM(BPF_REG_0, 0),
|
|
BPF_ST_MEM(BPF_W, BPF_REG_2, 0, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
|
|
BPF_EXIT_INSN(),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 2),
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_delete_elem),
|
|
BPF_EXIT_INSN(),
|
|
},
|
|
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
|
|
.fixup_map_kptr = { 1 },
|
|
.result = REJECT,
|
|
.errstr = "kptr cannot be accessed indirectly by helper",
|
|
},
|