351 lines
8.1 KiB
C
351 lines
8.1 KiB
C
/*
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* Test cases for lib/string_helpers.c module.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/string.h>
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#include <linux/string_helpers.h>
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static __init bool test_string_check_buf(const char *name, unsigned int flags,
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char *in, size_t p,
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char *out_real, size_t q_real,
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char *out_test, size_t q_test)
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{
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if (q_real == q_test && !memcmp(out_test, out_real, q_test))
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return true;
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pr_warn("Test '%s' failed: flags = %u\n", name, flags);
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print_hex_dump(KERN_WARNING, "Input: ", DUMP_PREFIX_NONE, 16, 1,
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in, p, true);
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print_hex_dump(KERN_WARNING, "Expected: ", DUMP_PREFIX_NONE, 16, 1,
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out_test, q_test, true);
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print_hex_dump(KERN_WARNING, "Got: ", DUMP_PREFIX_NONE, 16, 1,
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out_real, q_real, true);
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return false;
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}
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struct test_string {
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const char *in;
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const char *out;
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unsigned int flags;
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};
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static const struct test_string strings[] __initconst = {
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{
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.in = "\\f\\ \\n\\r\\t\\v",
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.out = "\f\\ \n\r\t\v",
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.flags = UNESCAPE_SPACE,
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},
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{
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.in = "\\40\\1\\387\\0064\\05\\040\\8a\\110\\777",
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.out = " \001\00387\0064\005 \\8aH?7",
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.flags = UNESCAPE_OCTAL,
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},
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{
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.in = "\\xv\\xa\\x2c\\xD\\x6f2",
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.out = "\\xv\n,\ro2",
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.flags = UNESCAPE_HEX,
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},
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{
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.in = "\\h\\\\\\\"\\a\\e\\",
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.out = "\\h\\\"\a\e\\",
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.flags = UNESCAPE_SPECIAL,
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},
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};
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static void __init test_string_unescape(const char *name, unsigned int flags,
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bool inplace)
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{
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int q_real = 256;
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char *in = kmalloc(q_real, GFP_KERNEL);
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char *out_test = kmalloc(q_real, GFP_KERNEL);
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char *out_real = kmalloc(q_real, GFP_KERNEL);
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int i, p = 0, q_test = 0;
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if (!in || !out_test || !out_real)
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goto out;
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for (i = 0; i < ARRAY_SIZE(strings); i++) {
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const char *s = strings[i].in;
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int len = strlen(strings[i].in);
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/* Copy string to in buffer */
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memcpy(&in[p], s, len);
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p += len;
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/* Copy expected result for given flags */
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if (flags & strings[i].flags) {
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s = strings[i].out;
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len = strlen(strings[i].out);
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}
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memcpy(&out_test[q_test], s, len);
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q_test += len;
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}
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in[p++] = '\0';
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/* Call string_unescape and compare result */
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if (inplace) {
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memcpy(out_real, in, p);
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if (flags == UNESCAPE_ANY)
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q_real = string_unescape_any_inplace(out_real);
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else
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q_real = string_unescape_inplace(out_real, flags);
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} else if (flags == UNESCAPE_ANY) {
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q_real = string_unescape_any(in, out_real, q_real);
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} else {
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q_real = string_unescape(in, out_real, q_real, flags);
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}
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test_string_check_buf(name, flags, in, p - 1, out_real, q_real,
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out_test, q_test);
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out:
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kfree(out_real);
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kfree(out_test);
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kfree(in);
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}
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struct test_string_1 {
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const char *out;
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unsigned int flags;
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};
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#define TEST_STRING_2_MAX_S1 32
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struct test_string_2 {
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const char *in;
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struct test_string_1 s1[TEST_STRING_2_MAX_S1];
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};
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#define TEST_STRING_2_DICT_0 NULL
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static const struct test_string_2 escape0[] __initconst = {{
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.in = "\f\\ \n\r\t\v",
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.s1 = {{
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.out = "\\f\\ \\n\\r\\t\\v",
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.flags = ESCAPE_SPACE,
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},{
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.out = "\\f\\134\\040\\n\\r\\t\\v",
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.flags = ESCAPE_SPACE | ESCAPE_OCTAL,
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},{
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.out = "\\f\\x5c\\x20\\n\\r\\t\\v",
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.flags = ESCAPE_SPACE | ESCAPE_HEX,
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},{
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/* terminator */
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}},
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},{
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.in = "\\h\\\"\a\e\\",
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.s1 = {{
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.out = "\\\\h\\\\\"\\a\\e\\\\",
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.flags = ESCAPE_SPECIAL,
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},{
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.out = "\\\\\\150\\\\\\042\\a\\e\\\\",
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.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL,
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},{
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.out = "\\\\\\x68\\\\\\x22\\a\\e\\\\",
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.flags = ESCAPE_SPECIAL | ESCAPE_HEX,
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},{
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/* terminator */
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}},
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},{
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.in = "\eb \\C\007\"\x90\r]",
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.s1 = {{
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.out = "\eb \\C\007\"\x90\\r]",
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.flags = ESCAPE_SPACE,
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},{
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.out = "\\eb \\\\C\\a\"\x90\r]",
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.flags = ESCAPE_SPECIAL,
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},{
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.out = "\\eb \\\\C\\a\"\x90\\r]",
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.flags = ESCAPE_SPACE | ESCAPE_SPECIAL,
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},{
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.out = "\\033\\142\\040\\134\\103\\007\\042\\220\\015\\135",
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.flags = ESCAPE_OCTAL,
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},{
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.out = "\\033\\142\\040\\134\\103\\007\\042\\220\\r\\135",
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.flags = ESCAPE_SPACE | ESCAPE_OCTAL,
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},{
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.out = "\\e\\142\\040\\\\\\103\\a\\042\\220\\015\\135",
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.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL,
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},{
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.out = "\\e\\142\\040\\\\\\103\\a\\042\\220\\r\\135",
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.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_OCTAL,
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},{
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.out = "\eb \\C\007\"\x90\r]",
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.flags = ESCAPE_NP,
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},{
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.out = "\eb \\C\007\"\x90\\r]",
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.flags = ESCAPE_SPACE | ESCAPE_NP,
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},{
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.out = "\\eb \\C\\a\"\x90\r]",
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.flags = ESCAPE_SPECIAL | ESCAPE_NP,
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},{
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.out = "\\eb \\C\\a\"\x90\\r]",
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.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_NP,
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},{
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.out = "\\033b \\C\\007\"\\220\\015]",
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.flags = ESCAPE_OCTAL | ESCAPE_NP,
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},{
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.out = "\\033b \\C\\007\"\\220\\r]",
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.flags = ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_NP,
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},{
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.out = "\\eb \\C\\a\"\\220\\r]",
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.flags = ESCAPE_SPECIAL | ESCAPE_SPACE | ESCAPE_OCTAL |
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ESCAPE_NP,
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},{
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.out = "\\x1bb \\C\\x07\"\\x90\\x0d]",
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.flags = ESCAPE_NP | ESCAPE_HEX,
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},{
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/* terminator */
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}},
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},{
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/* terminator */
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}};
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#define TEST_STRING_2_DICT_1 "b\\ \t\r"
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static const struct test_string_2 escape1[] __initconst = {{
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.in = "\f\\ \n\r\t\v",
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.s1 = {{
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.out = "\f\\134\\040\n\\015\\011\v",
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.flags = ESCAPE_OCTAL,
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},{
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.out = "\f\\x5c\\x20\n\\x0d\\x09\v",
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.flags = ESCAPE_HEX,
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},{
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/* terminator */
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}},
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},{
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.in = "\\h\\\"\a\e\\",
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.s1 = {{
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.out = "\\134h\\134\"\a\e\\134",
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.flags = ESCAPE_OCTAL,
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},{
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/* terminator */
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}},
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},{
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.in = "\eb \\C\007\"\x90\r]",
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.s1 = {{
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.out = "\e\\142\\040\\134C\007\"\x90\\015]",
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.flags = ESCAPE_OCTAL,
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},{
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/* terminator */
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}},
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},{
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/* terminator */
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}};
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static __init const char *test_string_find_match(const struct test_string_2 *s2,
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unsigned int flags)
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{
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const struct test_string_1 *s1 = s2->s1;
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unsigned int i;
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if (!flags)
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return s2->in;
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/* Test cases are NULL-aware */
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flags &= ~ESCAPE_NULL;
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/* ESCAPE_OCTAL has a higher priority */
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if (flags & ESCAPE_OCTAL)
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flags &= ~ESCAPE_HEX;
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for (i = 0; i < TEST_STRING_2_MAX_S1 && s1->out; i++, s1++)
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if (s1->flags == flags)
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return s1->out;
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return NULL;
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}
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static __init void
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test_string_escape_overflow(const char *in, int p, unsigned int flags, const char *esc,
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int q_test, const char *name)
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{
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int q_real;
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q_real = string_escape_mem(in, p, NULL, 0, flags, esc);
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if (q_real != q_test)
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pr_warn("Test '%s' failed: flags = %u, osz = 0, expected %d, got %d\n",
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name, flags, q_test, q_real);
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}
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static __init void test_string_escape(const char *name,
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const struct test_string_2 *s2,
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unsigned int flags, const char *esc)
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{
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size_t out_size = 512;
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char *out_test = kmalloc(out_size, GFP_KERNEL);
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char *out_real = kmalloc(out_size, GFP_KERNEL);
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char *in = kmalloc(256, GFP_KERNEL);
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int p = 0, q_test = 0;
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int q_real;
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if (!out_test || !out_real || !in)
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goto out;
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for (; s2->in; s2++) {
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const char *out;
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int len;
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/* NULL injection */
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if (flags & ESCAPE_NULL) {
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in[p++] = '\0';
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out_test[q_test++] = '\\';
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out_test[q_test++] = '0';
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}
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/* Don't try strings that have no output */
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out = test_string_find_match(s2, flags);
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if (!out)
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continue;
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/* Copy string to in buffer */
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len = strlen(s2->in);
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memcpy(&in[p], s2->in, len);
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p += len;
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/* Copy expected result for given flags */
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len = strlen(out);
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memcpy(&out_test[q_test], out, len);
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q_test += len;
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}
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q_real = string_escape_mem(in, p, out_real, out_size, flags, esc);
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test_string_check_buf(name, flags, in, p, out_real, q_real, out_test,
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q_test);
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test_string_escape_overflow(in, p, flags, esc, q_test, name);
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out:
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kfree(in);
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kfree(out_real);
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kfree(out_test);
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}
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static int __init test_string_helpers_init(void)
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{
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unsigned int i;
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pr_info("Running tests...\n");
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for (i = 0; i < UNESCAPE_ANY + 1; i++)
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test_string_unescape("unescape", i, false);
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test_string_unescape("unescape inplace",
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get_random_int() % (UNESCAPE_ANY + 1), true);
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/* Without dictionary */
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for (i = 0; i < (ESCAPE_ANY_NP | ESCAPE_HEX) + 1; i++)
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test_string_escape("escape 0", escape0, i, TEST_STRING_2_DICT_0);
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/* With dictionary */
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for (i = 0; i < (ESCAPE_ANY_NP | ESCAPE_HEX) + 1; i++)
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test_string_escape("escape 1", escape1, i, TEST_STRING_2_DICT_1);
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return -EINVAL;
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}
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module_init(test_string_helpers_init);
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MODULE_LICENSE("Dual BSD/GPL");
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