diff options
| -rw-r--r-- | tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c b/tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c index dcaab61a11a0..2129e4353fd9 100644 --- a/tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c +++ b/tools/testing/selftests/bpf/progs/verifier_value_illegal_alu.c @@ -3,6 +3,7 @@ #include <linux/bpf.h> #include <bpf/bpf_helpers.h> +#include "../../../include/linux/filter.h" #include "bpf_misc.h" #define MAX_ENTRIES 11 @@ -183,4 +184,32 @@ __naked void flow_keys_illegal_variable_offset_alu(void) : __clobber_all); } +#define DEFINE_BAD_OFFSET_TEST(name, op, off, imm) \ + SEC("socket") \ + __failure __msg("BPF_ALU uses reserved fields") \ + __naked void name(void) \ + { \ + asm volatile( \ + "r0 = 1;" \ + ".8byte %[insn];" \ + "r0 = 0;" \ + "exit;" \ + : \ + : __imm_insn(insn, BPF_RAW_INSN((op), 0, 0, (off), (imm))) \ + : __clobber_all); \ + } + +/* + * Offset fields of 0 and 1 are legal for BPF_{DIV,MOD} instructions. + * Offset fields of 0 are legal for the rest of ALU instructions. + * Test that error is reported for illegal offsets, assuming that tests + * for legal offsets exist. + */ +DEFINE_BAD_OFFSET_TEST(bad_offset_divx, BPF_ALU64 | BPF_DIV | BPF_X, -1, 0) +DEFINE_BAD_OFFSET_TEST(bad_offset_modk, BPF_ALU64 | BPF_MOD | BPF_K, -1, 1) +DEFINE_BAD_OFFSET_TEST(bad_offset_addx, BPF_ALU64 | BPF_ADD | BPF_X, -1, 0) +DEFINE_BAD_OFFSET_TEST(bad_offset_divx2, BPF_ALU64 | BPF_DIV | BPF_X, 2, 0) +DEFINE_BAD_OFFSET_TEST(bad_offset_modk2, BPF_ALU64 | BPF_MOD | BPF_K, 2, 1) +DEFINE_BAD_OFFSET_TEST(bad_offset_addx2, BPF_ALU64 | BPF_ADD | BPF_X, 1, 0) + char _license[] SEC("license") = "GPL"; |