perf llvm: Fix inadvertent file creation

[platform/kernel/linux-starfive.git] / tools / perf / util / llvm-utils.c

diff --git a/tools/perf/util/llvm-utils.c b/tools/perf/util/llvm-utils.c
index 650ffe3..4e8e243 100644 (file)
--- a/tools/perf/util/llvm-utils.c
+++ b/tools/perf/util/llvm-utils.c
@@ -531,14 +531,37 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf,
 
        pr_debug("llvm compiling command template: %s\n", template);
 
+       /*
+        * Below, substitute control characters for values that can cause the
+        * echo to misbehave, then substitute the values back.
+        */
        err = -ENOMEM;
-       if (asprintf(&command_echo, "echo -n \"%s\"", template) < 0)
+       if (asprintf(&command_echo, "echo -n \a%s\a", template) < 0)
                goto errout;
 
+#define SWAP_CHAR(a, b) do { if (*p == a) *p = b; } while (0)
+       for (char *p = command_echo; *p; p++) {
+               SWAP_CHAR('<', '\001');
+               SWAP_CHAR('>', '\002');
+               SWAP_CHAR('"', '\003');
+               SWAP_CHAR('\'', '\004');
+               SWAP_CHAR('|', '\005');
+               SWAP_CHAR('&', '\006');
+               SWAP_CHAR('\a', '"');
+       }
        err = read_from_pipe(command_echo, (void **) &command_out, NULL);
        if (err)
                goto errout;
 
+       for (char *p = command_out; *p; p++) {
+               SWAP_CHAR('\001', '<');
+               SWAP_CHAR('\002', '>');
+               SWAP_CHAR('\003', '"');
+               SWAP_CHAR('\004', '\'');
+               SWAP_CHAR('\005', '|');
+               SWAP_CHAR('\006', '&');
+       }
+#undef SWAP_CHAR
        pr_debug("llvm compiling command : %s\n", command_out);
 
        err = read_from_pipe(template, &obj_buf, &obj_buf_sz);