| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | |
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| 3 | #include <linux/bpf.h> |
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| 4 | #include <bpf/bpf_helpers.h> |
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| 5 | #include "bpf_misc.h" |
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| 6 | |
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| 7 | #if (defined(__TARGET_ARCH_arm64) || defined(__TARGET_ARCH_x86) || \ |
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| 8 | (defined(__TARGET_ARCH_riscv) && __riscv_xlen == 64) || \ |
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| 9 | defined(__TARGET_ARCH_arm) || defined(__TARGET_ARCH_s390) || \ |
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| 10 | defined(__TARGET_ARCH_loongarch)) && \ |
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| 11 | __clang_major__ >= 18 |
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| 12 | |
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| 13 | SEC("socket" ) |
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| 14 | __description("LDSX, S8" ) |
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| 15 | __success __success_unpriv __retval(-2) |
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| 16 | __naked void ldsx_s8(void) |
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| 17 | { |
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| 18 | asm volatile ( |
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| 19 | "r1 = 0x3fe;" |
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| 20 | "*(u64 *)(r10 - 8) = r1;" |
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| 21 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
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| 22 | "r0 = *(s8 *)(r10 - 8);" |
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| 23 | #else |
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| 24 | "r0 = *(s8 *)(r10 - 1);" |
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| 25 | #endif |
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| 26 | "exit;" |
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| 27 | ::: __clobber_all); |
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| 28 | } |
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| 29 | |
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| 30 | SEC("socket" ) |
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| 31 | __description("LDSX, S16" ) |
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| 32 | __success __success_unpriv __retval(-2) |
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| 33 | __naked void ldsx_s16(void) |
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| 34 | { |
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| 35 | asm volatile ( |
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| 36 | "r1 = 0x3fffe;" |
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| 37 | "*(u64 *)(r10 - 8) = r1;" |
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| 38 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
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| 39 | "r0 = *(s16 *)(r10 - 8);" |
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| 40 | #else |
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| 41 | "r0 = *(s16 *)(r10 - 2);" |
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| 42 | #endif |
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| 43 | "exit;" |
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| 44 | ::: __clobber_all); |
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| 45 | } |
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| 46 | |
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| 47 | SEC("socket" ) |
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| 48 | __description("LDSX, S32" ) |
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| 49 | __success __success_unpriv __retval(-1) |
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| 50 | __naked void ldsx_s32(void) |
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| 51 | { |
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| 52 | asm volatile ( |
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| 53 | "r1 = 0xfffffffe;" |
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| 54 | "*(u64 *)(r10 - 8) = r1;" |
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| 55 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
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| 56 | "r0 = *(s32 *)(r10 - 8);" |
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| 57 | #else |
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| 58 | "r0 = *(s32 *)(r10 - 4);" |
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| 59 | #endif |
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| 60 | "r0 >>= 1;" |
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| 61 | "exit;" |
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| 62 | ::: __clobber_all); |
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| 63 | } |
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| 64 | |
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| 65 | SEC("socket" ) |
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| 66 | __description("LDSX, S8 range checking, privileged" ) |
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| 67 | __log_level(2) __success __retval(1) |
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| 68 | __msg("R1_w=scalar(smin=smin32=-128,smax=smax32=127)" ) |
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| 69 | __naked void ldsx_s8_range_priv(void) |
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| 70 | { |
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| 71 | asm volatile ( |
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| 72 | "call %[bpf_get_prandom_u32];" |
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| 73 | "*(u64 *)(r10 - 8) = r0;" |
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| 74 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
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| 75 | "r1 = *(s8 *)(r10 - 8);" |
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| 76 | #else |
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| 77 | "r1 = *(s8 *)(r10 - 1);" |
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| 78 | #endif |
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| 79 | /* r1 with s8 range */ |
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| 80 | "if r1 s> 0x7f goto l0_%=;" |
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| 81 | "if r1 s< -0x80 goto l0_%=;" |
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| 82 | "r0 = 1;" |
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| 83 | "l1_%=:" |
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| 84 | "exit;" |
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| 85 | "l0_%=:" |
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| 86 | "r0 = 2;" |
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| 87 | "goto l1_%=;" |
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| 88 | : |
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| 89 | : __imm(bpf_get_prandom_u32) |
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| 90 | : __clobber_all); |
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| 91 | } |
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| 92 | |
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| 93 | SEC("socket" ) |
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| 94 | __description("LDSX, S16 range checking" ) |
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| 95 | __success __success_unpriv __retval(1) |
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| 96 | __naked void ldsx_s16_range(void) |
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| 97 | { |
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| 98 | asm volatile ( |
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| 99 | "call %[bpf_get_prandom_u32];" |
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| 100 | "*(u64 *)(r10 - 8) = r0;" |
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| 101 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
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| 102 | "r1 = *(s16 *)(r10 - 8);" |
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| 103 | #else |
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| 104 | "r1 = *(s16 *)(r10 - 2);" |
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| 105 | #endif |
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| 106 | /* r1 with s16 range */ |
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| 107 | "if r1 s> 0x7fff goto l0_%=;" |
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| 108 | "if r1 s< -0x8000 goto l0_%=;" |
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| 109 | "r0 = 1;" |
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| 110 | "l1_%=:" |
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| 111 | "exit;" |
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| 112 | "l0_%=:" |
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| 113 | "r0 = 2;" |
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| 114 | "goto l1_%=;" |
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| 115 | : |
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| 116 | : __imm(bpf_get_prandom_u32) |
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| 117 | : __clobber_all); |
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| 118 | } |
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| 119 | |
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| 120 | SEC("socket" ) |
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| 121 | __description("LDSX, S32 range checking" ) |
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| 122 | __success __success_unpriv __retval(1) |
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| 123 | __naked void ldsx_s32_range(void) |
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| 124 | { |
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| 125 | asm volatile ( |
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| 126 | "call %[bpf_get_prandom_u32];" |
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| 127 | "*(u64 *)(r10 - 8) = r0;" |
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| 128 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
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| 129 | "r1 = *(s32 *)(r10 - 8);" |
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| 130 | #else |
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| 131 | "r1 = *(s32 *)(r10 - 4);" |
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| 132 | #endif |
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| 133 | /* r1 with s16 range */ |
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| 134 | "if r1 s> 0x7fffFFFF goto l0_%=;" |
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| 135 | "if r1 s< -0x80000000 goto l0_%=;" |
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| 136 | "r0 = 1;" |
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| 137 | "l1_%=:" |
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| 138 | "exit;" |
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| 139 | "l0_%=:" |
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| 140 | "r0 = 2;" |
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| 141 | "goto l1_%=;" |
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| 142 | : |
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| 143 | : __imm(bpf_get_prandom_u32) |
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| 144 | : __clobber_all); |
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| 145 | } |
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| 146 | |
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| 147 | #else |
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| 148 | |
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| 149 | SEC("socket" ) |
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| 150 | __description("cpuv4 is not supported by compiler or jit, use a dummy test" ) |
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| 151 | __success |
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| 152 | int dummy_test(void) |
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| 153 | { |
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| 154 | return 0; |
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| 155 | } |
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| 156 | |
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| 157 | #endif |
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| 158 | |
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| 159 | char _license[] SEC("license" ) = "GPL" ; |
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| 160 | |
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