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-rw-r--r--tools/testing/selftests/bpf/progs/verifier_cfg.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/verifier_cfg.c b/tools/testing/selftests/bpf/progs/verifier_cfg.c
index df7697b940..c1f55e1d80 100644
--- a/tools/testing/selftests/bpf/progs/verifier_cfg.c
+++ b/tools/testing/selftests/bpf/progs/verifier_cfg.c
@@ -97,4 +97,66 @@ l0_%=: r2 = r0; \
" ::: __clobber_all);
}
+SEC("socket")
+__description("conditional loop (2)")
+__success
+__failure_unpriv __msg_unpriv("back-edge from insn 10 to 11")
+__naked void conditional_loop2(void)
+{
+ asm volatile (" \
+ r9 = 2 ll; \
+ r3 = 0x20 ll; \
+ r4 = 0x35 ll; \
+ r8 = r4; \
+ goto l1_%=; \
+l0_%=: r9 -= r3; \
+ r9 -= r4; \
+ r9 -= r8; \
+l1_%=: r8 += r4; \
+ if r8 < 0x64 goto l0_%=; \
+ r0 = r9; \
+ exit; \
+" ::: __clobber_all);
+}
+
+SEC("socket")
+__description("unconditional loop after conditional jump")
+__failure __msg("infinite loop detected")
+__failure_unpriv __msg_unpriv("back-edge from insn 3 to 2")
+__naked void uncond_loop_after_cond_jmp(void)
+{
+ asm volatile (" \
+ r0 = 0; \
+ if r0 > 0 goto l1_%=; \
+l0_%=: r0 = 1; \
+ goto l0_%=; \
+l1_%=: exit; \
+" ::: __clobber_all);
+}
+
+
+__naked __noinline __used
+static unsigned long never_ending_subprog()
+{
+ asm volatile (" \
+ r0 = r1; \
+ goto -1; \
+" ::: __clobber_all);
+}
+
+SEC("socket")
+__description("unconditional loop after conditional jump")
+/* infinite loop is detected *after* check_cfg() */
+__failure __msg("infinite loop detected")
+__naked void uncond_loop_in_subprog_after_cond_jmp(void)
+{
+ asm volatile (" \
+ r0 = 0; \
+ if r0 > 0 goto l1_%=; \
+l0_%=: r0 += 1; \
+ call never_ending_subprog; \
+l1_%=: exit; \
+" ::: __clobber_all);
+}
+
char _license[] SEC("license") = "GPL";