| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Andrey Ignatov | 6447 | 94.61% | 7 | 31.82% |
| Ilya Leoshkevich | 314 | 4.61% | 7 | 31.82% |
| Andrii Nakryiko | 45 | 0.66% | 3 | 13.64% |
| Daniel Müller | 3 | 0.04% | 1 | 4.55% |
| Artem Savkov | 2 | 0.03% | 1 | 4.55% |
| Yafang Shao | 1 | 0.01% | 1 | 4.55% |
| Toke Höiland-Jörgensen | 1 | 0.01% | 1 | 4.55% |
| John Fastabend | 1 | 0.01% | 1 | 4.55% |
| Total | 6814 | 22 |
// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2019 Facebook #include <fcntl.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <linux/filter.h> #include <bpf/bpf.h> #include <bpf/libbpf.h> #include <bpf/bpf_endian.h> #include "bpf_util.h" #include "cgroup_helpers.h" #include "testing_helpers.h" #define CG_PATH "/foo" #define MAX_INSNS 512 #define FIXUP_SYSCTL_VALUE 0 char bpf_log_buf[BPF_LOG_BUF_SIZE]; struct sysctl_test { const char *descr; size_t fixup_value_insn; struct bpf_insn insns[MAX_INSNS]; const char *prog_file; enum bpf_attach_type attach_type; const char *sysctl; int open_flags; int seek; const char *newval; const char *oldval; enum { LOAD_REJECT, ATTACH_REJECT, OP_EPERM, SUCCESS, } result; }; static struct sysctl_test tests[] = { { .descr = "sysctl wrong attach_type", .insns = { BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .attach_type = 0, .sysctl = "kernel/ostype", .open_flags = O_RDONLY, .result = ATTACH_REJECT, }, { .descr = "sysctl:read allow all", .insns = { BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "kernel/ostype", .open_flags = O_RDONLY, .result = SUCCESS, }, { .descr = "sysctl:read deny all", .insns = { BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "kernel/ostype", .open_flags = O_RDONLY, .result = OP_EPERM, }, { .descr = "ctx:write sysctl:read read ok", .insns = { /* If (write) */ BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1, offsetof(struct bpf_sysctl, write)), BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 1, 2), /* return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_JMP_A(1), /* else return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "kernel/ostype", .open_flags = O_RDONLY, .result = SUCCESS, }, { .descr = "ctx:write sysctl:write read ok", .insns = { /* If (write) */ BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1, offsetof(struct bpf_sysctl, write)), BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 1, 2), /* return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_JMP_A(1), /* else return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "kernel/domainname", .open_flags = O_WRONLY, .newval = "(none)", /* same as default, should fail anyway */ .result = OP_EPERM, }, { .descr = "ctx:write sysctl:write read ok narrow", .insns = { /* u64 w = (u16)write & 1; */ #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_1, offsetof(struct bpf_sysctl, write)), #else BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_1, offsetof(struct bpf_sysctl, write) + 2), #endif BPF_ALU64_IMM(BPF_AND, BPF_REG_7, 1), /* return 1 - w; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_7), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "kernel/domainname", .open_flags = O_WRONLY, .newval = "(none)", /* same as default, should fail anyway */ .result = OP_EPERM, }, { .descr = "ctx:write sysctl:read write reject", .insns = { /* write = X */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, offsetof(struct bpf_sysctl, write)), BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "kernel/ostype", .open_flags = O_RDONLY, .result = LOAD_REJECT, }, { .descr = "ctx:file_pos sysctl:read read ok", .insns = { /* If (file_pos == X) */ BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1, offsetof(struct bpf_sysctl, file_pos)), BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 3, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "kernel/ostype", .open_flags = O_RDONLY, .seek = 3, .result = SUCCESS, }, { .descr = "ctx:file_pos sysctl:read read ok narrow", .insns = { /* If (file_pos == X) */ #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_1, offsetof(struct bpf_sysctl, file_pos)), #else BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_1, offsetof(struct bpf_sysctl, file_pos) + 3), #endif BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 4, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "kernel/ostype", .open_flags = O_RDONLY, .seek = 4, .result = SUCCESS, }, { .descr = "ctx:file_pos sysctl:read write ok", .insns = { /* file_pos = X */ BPF_MOV64_IMM(BPF_REG_0, 2), BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, offsetof(struct bpf_sysctl, file_pos)), BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "kernel/ostype", .open_flags = O_RDONLY, .oldval = "nux\n", .result = SUCCESS, }, { .descr = "sysctl_get_name sysctl_value:base ok", .insns = { /* sysctl_get_name arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, 0), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_name arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 8), /* sysctl_get_name arg4 (flags) */ BPF_MOV64_IMM(BPF_REG_4, BPF_F_SYSCTL_BASE_NAME), /* sysctl_get_name(ctx, buf, buf_len, flags) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_name), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, sizeof("tcp_mem") - 1, 6), /* buf == "tcp_mem\0") */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x7463705f6d656d00ULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/tcp_mem", .open_flags = O_RDONLY, .result = SUCCESS, }, { .descr = "sysctl_get_name sysctl_value:base E2BIG truncated", .insns = { /* sysctl_get_name arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, 0), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_name arg3 (buf_len) too small */ BPF_MOV64_IMM(BPF_REG_3, 7), /* sysctl_get_name arg4 (flags) */ BPF_MOV64_IMM(BPF_REG_4, BPF_F_SYSCTL_BASE_NAME), /* sysctl_get_name(ctx, buf, buf_len, flags) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_name), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -E2BIG, 6), /* buf[0:7] == "tcp_me\0") */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x7463705f6d650000ULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/tcp_mem", .open_flags = O_RDONLY, .result = SUCCESS, }, { .descr = "sysctl_get_name sysctl:full ok", .insns = { /* sysctl_get_name arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -24), BPF_MOV64_IMM(BPF_REG_0, 0), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 8), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 16), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_name arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 17), /* sysctl_get_name arg4 (flags) */ BPF_MOV64_IMM(BPF_REG_4, 0), /* sysctl_get_name(ctx, buf, buf_len, flags) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_name), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 16, 14), /* buf[0:8] == "net/ipv4" && */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x6e65742f69707634ULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 10), /* buf[8:16] == "/tcp_mem" && */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x2f7463705f6d656dULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 8), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 6), /* buf[16:24] == "\0") */ BPF_LD_IMM64(BPF_REG_8, 0x0ULL), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 16), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/tcp_mem", .open_flags = O_RDONLY, .result = SUCCESS, }, { .descr = "sysctl_get_name sysctl:full E2BIG truncated", .insns = { /* sysctl_get_name arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -16), BPF_MOV64_IMM(BPF_REG_0, 0), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 8), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_name arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 16), /* sysctl_get_name arg4 (flags) */ BPF_MOV64_IMM(BPF_REG_4, 0), /* sysctl_get_name(ctx, buf, buf_len, flags) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_name), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -E2BIG, 10), /* buf[0:8] == "net/ipv4" && */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x6e65742f69707634ULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 6), /* buf[8:16] == "/tcp_me\0") */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x2f7463705f6d6500ULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 8), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/tcp_mem", .open_flags = O_RDONLY, .result = SUCCESS, }, { .descr = "sysctl_get_name sysctl:full E2BIG truncated small", .insns = { /* sysctl_get_name arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, 0), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_name arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 7), /* sysctl_get_name arg4 (flags) */ BPF_MOV64_IMM(BPF_REG_4, 0), /* sysctl_get_name(ctx, buf, buf_len, flags) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_name), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -E2BIG, 6), /* buf[0:8] == "net/ip\0") */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x6e65742f69700000ULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/tcp_mem", .open_flags = O_RDONLY, .result = SUCCESS, }, { .descr = "sysctl_get_current_value sysctl:read ok, gt", .insns = { /* sysctl_get_current_value arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_current_value arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 8), /* sysctl_get_current_value(ctx, buf, buf_len) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_current_value), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 6, 6), /* buf[0:6] == "Linux\n\0") */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x4c696e75780a0000ULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "kernel/ostype", .open_flags = O_RDONLY, .result = SUCCESS, }, { .descr = "sysctl_get_current_value sysctl:read ok, eq", .insns = { /* sysctl_get_current_value arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, 0), BPF_STX_MEM(BPF_B, BPF_REG_7, BPF_REG_0, 7), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_current_value arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 7), /* sysctl_get_current_value(ctx, buf, buf_len) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_current_value), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 6, 6), /* buf[0:6] == "Linux\n\0") */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x4c696e75780a0000ULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "kernel/ostype", .open_flags = O_RDONLY, .result = SUCCESS, }, { .descr = "sysctl_get_current_value sysctl:read E2BIG truncated", .insns = { /* sysctl_get_current_value arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, 0), BPF_STX_MEM(BPF_H, BPF_REG_7, BPF_REG_0, 6), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_current_value arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 6), /* sysctl_get_current_value(ctx, buf, buf_len) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_current_value), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -E2BIG, 6), /* buf[0:6] == "Linux\0") */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x4c696e7578000000ULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "kernel/ostype", .open_flags = O_RDONLY, .result = SUCCESS, }, { .descr = "sysctl_get_current_value sysctl:read EINVAL", .insns = { /* sysctl_get_current_value arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_current_value arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 8), /* sysctl_get_current_value(ctx, buf, buf_len) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_current_value), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -EINVAL, 4), /* buf[0:8] is NUL-filled) */ BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_IMM(BPF_JNE, BPF_REG_9, 0, 2), /* return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_JMP_A(1), /* else return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv6/conf/lo/stable_secret", /* -EIO */ .open_flags = O_RDONLY, .result = OP_EPERM, }, { .descr = "sysctl_get_current_value sysctl:write ok", .fixup_value_insn = 6, .insns = { /* sysctl_get_current_value arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_current_value arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 8), /* sysctl_get_current_value(ctx, buf, buf_len) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_current_value), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 4, 6), /* buf[0:4] == expected) */ BPF_LD_IMM64(BPF_REG_8, FIXUP_SYSCTL_VALUE), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 2), /* return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_JMP_A(1), /* else return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_WRONLY, .newval = "600", /* same as default, should fail anyway */ .result = OP_EPERM, }, { .descr = "sysctl_get_new_value sysctl:read EINVAL", .insns = { /* sysctl_get_new_value arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, 0), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_new_value arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 8), /* sysctl_get_new_value(ctx, buf, buf_len) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_new_value), /* if (ret == expected) */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -EINVAL, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/tcp_mem", .open_flags = O_RDONLY, .result = SUCCESS, }, { .descr = "sysctl_get_new_value sysctl:write ok", .insns = { /* sysctl_get_new_value arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_new_value arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 4), /* sysctl_get_new_value(ctx, buf, buf_len) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_new_value), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 3, 4), /* buf[0:4] == "606\0") */ BPF_LDX_MEM(BPF_W, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_IMM(BPF_JNE, BPF_REG_9, bpf_ntohl(0x36303600), 2), /* return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_JMP_A(1), /* else return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_WRONLY, .newval = "606", .result = OP_EPERM, }, { .descr = "sysctl_get_new_value sysctl:write ok long", .insns = { /* sysctl_get_new_value arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -24), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_new_value arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 24), /* sysctl_get_new_value(ctx, buf, buf_len) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_new_value), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 23, 14), /* buf[0:8] == "3000000 " && */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x3330303030303020ULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 10), /* buf[8:16] == "4000000 " && */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x3430303030303020ULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 8), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 6), /* buf[16:24] == "6000000\0") */ BPF_LD_IMM64(BPF_REG_8, bpf_be64_to_cpu(0x3630303030303000ULL)), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 16), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 2), /* return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_JMP_A(1), /* else return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/tcp_mem", .open_flags = O_WRONLY, .newval = "3000000 4000000 6000000", .result = OP_EPERM, }, { .descr = "sysctl_get_new_value sysctl:write E2BIG", .insns = { /* sysctl_get_new_value arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, 0), BPF_STX_MEM(BPF_B, BPF_REG_7, BPF_REG_0, 3), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_get_new_value arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 3), /* sysctl_get_new_value(ctx, buf, buf_len) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_get_new_value), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -E2BIG, 4), /* buf[0:3] == "60\0") */ BPF_LDX_MEM(BPF_W, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_IMM(BPF_JNE, BPF_REG_9, bpf_ntohl(0x36300000), 2), /* return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_JMP_A(1), /* else return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_WRONLY, .newval = "606", .result = OP_EPERM, }, { .descr = "sysctl_set_new_value sysctl:read EINVAL", .insns = { /* sysctl_set_new_value arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, bpf_ntohl(0x36303000)), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_set_new_value arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 3), /* sysctl_set_new_value(ctx, buf, buf_len) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_set_new_value), /* if (ret == expected) */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -EINVAL, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_RDONLY, .result = SUCCESS, }, { .descr = "sysctl_set_new_value sysctl:write ok", .fixup_value_insn = 2, .insns = { /* sysctl_set_new_value arg2 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_LD_IMM64(BPF_REG_0, FIXUP_SYSCTL_VALUE), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_2, BPF_REG_7), /* sysctl_set_new_value arg3 (buf_len) */ BPF_MOV64_IMM(BPF_REG_3, 3), /* sysctl_set_new_value(ctx, buf, buf_len) */ BPF_EMIT_CALL(BPF_FUNC_sysctl_set_new_value), /* if (ret == expected) */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_WRONLY, .newval = "606", .result = SUCCESS, }, { "bpf_strtoul one number string", .insns = { /* arg1 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, bpf_ntohl(0x36303000)), BPF_STX_MEM(BPF_W, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), /* arg2 (buf_len) */ BPF_MOV64_IMM(BPF_REG_2, 4), /* arg3 (flags) */ BPF_MOV64_IMM(BPF_REG_3, 0), /* arg4 (res) */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_4, BPF_REG_7), BPF_EMIT_CALL(BPF_FUNC_strtoul), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 3, 4), /* res == expected) */ BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_IMM(BPF_JNE, BPF_REG_9, 600, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_RDONLY, .result = SUCCESS, }, { "bpf_strtoul multi number string", .insns = { /* arg1 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), /* "600 602\0" */ BPF_LD_IMM64(BPF_REG_0, bpf_be64_to_cpu(0x3630302036303200ULL)), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), /* arg2 (buf_len) */ BPF_MOV64_IMM(BPF_REG_2, 8), /* arg3 (flags) */ BPF_MOV64_IMM(BPF_REG_3, 0), /* arg4 (res) */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_4, BPF_REG_7), BPF_EMIT_CALL(BPF_FUNC_strtoul), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 3, 18), /* res == expected) */ BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_IMM(BPF_JNE, BPF_REG_9, 600, 16), /* arg1 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_ALU64_REG(BPF_ADD, BPF_REG_7, BPF_REG_0), BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), /* arg2 (buf_len) */ BPF_MOV64_IMM(BPF_REG_2, 8), BPF_ALU64_REG(BPF_SUB, BPF_REG_2, BPF_REG_0), /* arg3 (flags) */ BPF_MOV64_IMM(BPF_REG_3, 0), /* arg4 (res) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -16), BPF_MOV64_REG(BPF_REG_4, BPF_REG_7), BPF_EMIT_CALL(BPF_FUNC_strtoul), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 4, 4), /* res == expected) */ BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_IMM(BPF_JNE, BPF_REG_9, 602, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/tcp_mem", .open_flags = O_RDONLY, .result = SUCCESS, }, { "bpf_strtoul buf_len = 0, reject", .insns = { /* arg1 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, bpf_ntohl(0x36303000)), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), /* arg2 (buf_len) */ BPF_MOV64_IMM(BPF_REG_2, 0), /* arg3 (flags) */ BPF_MOV64_IMM(BPF_REG_3, 0), /* arg4 (res) */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_4, BPF_REG_7), BPF_EMIT_CALL(BPF_FUNC_strtoul), BPF_MOV64_IMM(BPF_REG_0, 1), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_RDONLY, .result = LOAD_REJECT, }, { "bpf_strtoul supported base, ok", .insns = { /* arg1 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, bpf_ntohl(0x30373700)), BPF_STX_MEM(BPF_W, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), /* arg2 (buf_len) */ BPF_MOV64_IMM(BPF_REG_2, 4), /* arg3 (flags) */ BPF_MOV64_IMM(BPF_REG_3, 8), /* arg4 (res) */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_4, BPF_REG_7), BPF_EMIT_CALL(BPF_FUNC_strtoul), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 3, 4), /* res == expected) */ BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_IMM(BPF_JNE, BPF_REG_9, 63, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_RDONLY, .result = SUCCESS, }, { "bpf_strtoul unsupported base, EINVAL", .insns = { /* arg1 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, bpf_ntohl(0x36303000)), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), /* arg2 (buf_len) */ BPF_MOV64_IMM(BPF_REG_2, 4), /* arg3 (flags) */ BPF_MOV64_IMM(BPF_REG_3, 3), /* arg4 (res) */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_4, BPF_REG_7), BPF_EMIT_CALL(BPF_FUNC_strtoul), /* if (ret == expected) */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -EINVAL, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_RDONLY, .result = SUCCESS, }, { "bpf_strtoul buf with spaces only, EINVAL", .insns = { /* arg1 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_MOV64_IMM(BPF_REG_0, bpf_ntohl(0x0d0c0a09)), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), /* arg2 (buf_len) */ BPF_MOV64_IMM(BPF_REG_2, 4), /* arg3 (flags) */ BPF_MOV64_IMM(BPF_REG_3, 0), /* arg4 (res) */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_4, BPF_REG_7), BPF_EMIT_CALL(BPF_FUNC_strtoul), /* if (ret == expected) */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -EINVAL, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_RDONLY, .result = SUCCESS, }, { "bpf_strtoul negative number, EINVAL", .insns = { /* arg1 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), /* " -6\0" */ BPF_MOV64_IMM(BPF_REG_0, bpf_ntohl(0x0a2d3600)), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), /* arg2 (buf_len) */ BPF_MOV64_IMM(BPF_REG_2, 4), /* arg3 (flags) */ BPF_MOV64_IMM(BPF_REG_3, 0), /* arg4 (res) */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_4, BPF_REG_7), BPF_EMIT_CALL(BPF_FUNC_strtoul), /* if (ret == expected) */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -EINVAL, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_RDONLY, .result = SUCCESS, }, { "bpf_strtol negative number, ok", .insns = { /* arg1 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), /* " -6\0" */ BPF_MOV64_IMM(BPF_REG_0, bpf_ntohl(0x0a2d3600)), BPF_STX_MEM(BPF_W, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), /* arg2 (buf_len) */ BPF_MOV64_IMM(BPF_REG_2, 4), /* arg3 (flags) */ BPF_MOV64_IMM(BPF_REG_3, 10), /* arg4 (res) */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_4, BPF_REG_7), BPF_EMIT_CALL(BPF_FUNC_strtol), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 3, 4), /* res == expected) */ BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_IMM(BPF_JNE, BPF_REG_9, -6, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_RDONLY, .result = SUCCESS, }, { "bpf_strtol hex number, ok", .insns = { /* arg1 (buf) */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), /* "0xfe" */ BPF_MOV64_IMM(BPF_REG_0, bpf_ntohl(0x30786665)), BPF_STX_MEM(BPF_W, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), /* arg2 (buf_len) */ BPF_MOV64_IMM(BPF_REG_2, 4), /* arg3 (flags) */ BPF_MOV64_IMM(BPF_REG_3, 0), /* arg4 (res) */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_4, BPF_REG_7), BPF_EMIT_CALL(BPF_FUNC_strtol), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 4, 4), /* res == expected) */ BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_IMM(BPF_JNE, BPF_REG_9, 254, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_RDONLY, .result = SUCCESS, }, { "bpf_strtol max long", .insns = { /* arg1 (buf) 9223372036854775807 */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -24), BPF_LD_IMM64(BPF_REG_0, bpf_be64_to_cpu(0x3932323333373230ULL)), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_LD_IMM64(BPF_REG_0, bpf_be64_to_cpu(0x3336383534373735ULL)), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 8), BPF_LD_IMM64(BPF_REG_0, bpf_be64_to_cpu(0x3830370000000000ULL)), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 16), BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), /* arg2 (buf_len) */ BPF_MOV64_IMM(BPF_REG_2, 19), /* arg3 (flags) */ BPF_MOV64_IMM(BPF_REG_3, 0), /* arg4 (res) */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_4, BPF_REG_7), BPF_EMIT_CALL(BPF_FUNC_strtol), /* if (ret == expected && */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 19, 6), /* res == expected) */ BPF_LD_IMM64(BPF_REG_8, 0x7fffffffffffffffULL), BPF_LDX_MEM(BPF_DW, BPF_REG_9, BPF_REG_7, 0), BPF_JMP_REG(BPF_JNE, BPF_REG_8, BPF_REG_9, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_RDONLY, .result = SUCCESS, }, { "bpf_strtol overflow, ERANGE", .insns = { /* arg1 (buf) 9223372036854775808 */ BPF_MOV64_REG(BPF_REG_7, BPF_REG_10), BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -24), BPF_LD_IMM64(BPF_REG_0, bpf_be64_to_cpu(0x3932323333373230ULL)), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_LD_IMM64(BPF_REG_0, bpf_be64_to_cpu(0x3336383534373735ULL)), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 8), BPF_LD_IMM64(BPF_REG_0, bpf_be64_to_cpu(0x3830380000000000ULL)), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 16), BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), /* arg2 (buf_len) */ BPF_MOV64_IMM(BPF_REG_2, 19), /* arg3 (flags) */ BPF_MOV64_IMM(BPF_REG_3, 0), /* arg4 (res) */ BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8), BPF_STX_MEM(BPF_DW, BPF_REG_7, BPF_REG_0, 0), BPF_MOV64_REG(BPF_REG_4, BPF_REG_7), BPF_EMIT_CALL(BPF_FUNC_strtol), /* if (ret == expected) */ BPF_JMP_IMM(BPF_JNE, BPF_REG_0, -ERANGE, 2), /* return ALLOW; */ BPF_MOV64_IMM(BPF_REG_0, 1), BPF_JMP_A(1), /* else return DENY; */ BPF_MOV64_IMM(BPF_REG_0, 0), BPF_EXIT_INSN(), }, .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_RDONLY, .result = SUCCESS, }, { "C prog: deny all writes", .prog_file = "./test_sysctl_prog.bpf.o", .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/tcp_mem", .open_flags = O_WRONLY, .newval = "123 456 789", .result = OP_EPERM, }, { "C prog: deny access by name", .prog_file = "./test_sysctl_prog.bpf.o", .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/route/mtu_expires", .open_flags = O_RDONLY, .result = OP_EPERM, }, { "C prog: read tcp_mem", .prog_file = "./test_sysctl_prog.bpf.o", .attach_type = BPF_CGROUP_SYSCTL, .sysctl = "net/ipv4/tcp_mem", .open_flags = O_RDONLY, .result = SUCCESS, }, }; static size_t probe_prog_length(const struct bpf_insn *fp) { size_t len; for (len = MAX_INSNS - 1; len > 0; --len) if (fp[len].code != 0 || fp[len].imm != 0) break; return len + 1; } static int fixup_sysctl_value(const char *buf, size_t buf_len, struct bpf_insn *prog, size_t insn_num) { union { uint8_t raw[sizeof(uint64_t)]; uint64_t num; } value = {}; if (buf_len > sizeof(value)) { log_err("Value is too big (%zd) to use in fixup", buf_len); return -1; } if (prog[insn_num].code != (BPF_LD | BPF_DW | BPF_IMM)) { log_err("Can fixup only BPF_LD_IMM64 insns"); return -1; } memcpy(value.raw, buf, buf_len); prog[insn_num].imm = (uint32_t)value.num; prog[insn_num + 1].imm = (uint32_t)(value.num >> 32); return 0; } static int load_sysctl_prog_insns(struct sysctl_test *test, const char *sysctl_path) { struct bpf_insn *prog = test->insns; LIBBPF_OPTS(bpf_prog_load_opts, opts); int ret, insn_cnt; insn_cnt = probe_prog_length(prog); if (test->fixup_value_insn) { char buf[128]; ssize_t len; int fd; fd = open(sysctl_path, O_RDONLY | O_CLOEXEC); if (fd < 0) { log_err("open(%s) failed", sysctl_path); return -1; } len = read(fd, buf, sizeof(buf)); if (len == -1) { log_err("read(%s) failed", sysctl_path); close(fd); return -1; } close(fd); if (fixup_sysctl_value(buf, len, prog, test->fixup_value_insn)) return -1; } opts.log_buf = bpf_log_buf; opts.log_size = BPF_LOG_BUF_SIZE; ret = bpf_prog_load(BPF_PROG_TYPE_CGROUP_SYSCTL, NULL, "GPL", prog, insn_cnt, &opts); if (ret < 0 && test->result != LOAD_REJECT) { log_err(">>> Loading program error.\n" ">>> Verifier output:\n%s\n-------\n", bpf_log_buf); } return ret; } static int load_sysctl_prog_file(struct sysctl_test *test) { struct bpf_object *obj; int prog_fd; if (bpf_prog_test_load(test->prog_file, BPF_PROG_TYPE_CGROUP_SYSCTL, &obj, &prog_fd)) { if (test->result != LOAD_REJECT) log_err(">>> Loading program (%s) error.\n", test->prog_file); return -1; } return prog_fd; } static int load_sysctl_prog(struct sysctl_test *test, const char *sysctl_path) { return test->prog_file ? load_sysctl_prog_file(test) : load_sysctl_prog_insns(test, sysctl_path); } static int access_sysctl(const char *sysctl_path, const struct sysctl_test *test) { int err = 0; int fd; fd = open(sysctl_path, test->open_flags | O_CLOEXEC); if (fd < 0) return fd; if (test->seek && lseek(fd, test->seek, SEEK_SET) == -1) { log_err("lseek(%d) failed", test->seek); goto err; } if (test->open_flags == O_RDONLY) { char buf[128]; if (read(fd, buf, sizeof(buf)) == -1) goto err; if (test->oldval && strncmp(buf, test->oldval, strlen(test->oldval))) { log_err("Read value %s != %s", buf, test->oldval); goto err; } } else if (test->open_flags == O_WRONLY) { if (!test->newval) { log_err("New value for sysctl is not set"); goto err; } if (write(fd, test->newval, strlen(test->newval)) == -1) goto err; } else { log_err("Unexpected sysctl access: neither read nor write"); goto err; } goto out; err: err = -1; out: close(fd); return err; } static int run_test_case(int cgfd, struct sysctl_test *test) { enum bpf_attach_type atype = test->attach_type; char sysctl_path[128]; int progfd = -1; int err = 0; printf("Test case: %s .. ", test->descr); snprintf(sysctl_path, sizeof(sysctl_path), "/proc/sys/%s", test->sysctl); progfd = load_sysctl_prog(test, sysctl_path); if (progfd < 0) { if (test->result == LOAD_REJECT) goto out; else goto err; } if (bpf_prog_attach(progfd, cgfd, atype, BPF_F_ALLOW_OVERRIDE) < 0) { if (test->result == ATTACH_REJECT) goto out; else goto err; } errno = 0; if (access_sysctl(sysctl_path, test) == -1) { if (test->result == OP_EPERM && errno == EPERM) goto out; else goto err; } if (test->result != SUCCESS) { log_err("Unexpected success"); goto err; } goto out; err: err = -1; out: /* Detaching w/o checking return code: best effort attempt. */ if (progfd != -1) bpf_prog_detach(cgfd, atype); close(progfd); printf("[%s]\n", err ? "FAIL" : "PASS"); return err; } static int run_tests(int cgfd) { int passes = 0; int fails = 0; int i; for (i = 0; i < ARRAY_SIZE(tests); ++i) { if (run_test_case(cgfd, &tests[i])) ++fails; else ++passes; } printf("Summary: %d PASSED, %d FAILED\n", passes, fails); return fails ? -1 : 0; } int main(int argc, char **argv) { int cgfd = -1; int err = 0; cgfd = cgroup_setup_and_join(CG_PATH); if (cgfd < 0) goto err; /* Use libbpf 1.0 API mode */ libbpf_set_strict_mode(LIBBPF_STRICT_ALL); if (run_tests(cgfd)) goto err; goto out; err: err = -1; out: close(cgfd); cleanup_cgroup_environment(); return err; }
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