From: Alexei Starovoitov <ast@xxxxxxxxxx> Add few tests with may_goto and negative offset. Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx> --- .../bpf/progs/verifier_iterating_callbacks.c | 52 +++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c b/tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c index 8885e5239d6b..80c737b6d340 100644 --- a/tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c +++ b/tools/testing/selftests/bpf/progs/verifier_iterating_callbacks.c @@ -274,6 +274,58 @@ static __naked void iter_limit_bug_cb(void) ); } +int tmp_var; +SEC("socket") +__failure __msg("infinite loop detected at insn 2") +__naked void jgt_imm64_and_may_goto(void) +{ + asm volatile (" \ + r0 = %[tmp_var] ll; \ +l0_%=: .byte 0xe5; /* may_goto */ \ + .byte 0; /* regs */ \ + .short -3; /* off -3 */ \ + .long 0; /* imm */ \ + if r0 > 10 goto l0_%=; \ + r0 = 0; \ + exit; \ +" :: __imm_addr(tmp_var) + : __clobber_all); +} + +SEC("socket") +__failure __msg("infinite loop detected at insn 1") +__naked void may_goto_self(void) +{ + asm volatile (" \ + r0 = *(u32 *)(r10 - 4); \ +l0_%=: .byte 0xe5; /* may_goto */ \ + .byte 0; /* regs */ \ + .short -1; /* off -1 */ \ + .long 0; /* imm */ \ + if r0 > 10 goto l0_%=; \ + r0 = 0; \ + exit; \ +" ::: __clobber_all); +} + +SEC("socket") +__success __retval(0) +__naked void may_goto_neg_off(void) +{ + asm volatile (" \ + r0 = *(u32 *)(r10 - 4); \ + goto l0_%=; \ + goto l1_%=; \ +l0_%=: .byte 0xe5; /* may_goto */ \ + .byte 0; /* regs */ \ + .short -2; /* off -2 */ \ + .long 0; /* imm */ \ + if r0 > 10 goto l0_%=; \ +l1_%=: r0 = 0; \ + exit; \ +" ::: __clobber_all); +} + SEC("tc") __failure __flag(BPF_F_TEST_STATE_FREQ) -- 2.43.0