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https://github.com/torvalds/linux
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16c7fa0582
There are several places in kernel where modules unescapes input to convert C-Style Escape Sequences into byte codes. The patch provides generic implementation of such approach. Test cases are also included into the patch. [akpm@linux-foundation.org: clarify comment] [akpm@linux-foundation.org: export get_random_int() to modules] Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Samuel Thibault <samuel.thibault@ens-lyon.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jason Baron <jbaron@redhat.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: William Hubbs <w.d.hubbs@gmail.com> Cc: Chris Brannon <chris@the-brannons.com> Cc: Kirk Reiser <kirk@braille.uwo.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
103 lines
2.5 KiB
C
103 lines
2.5 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/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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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(unsigned int flags, bool inplace)
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{
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char in[256];
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char out_test[256];
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char out_real[256];
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int i, p = 0, q_test = 0, q_real = sizeof(out_real);
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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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if (q_real != q_test || memcmp(out_test, out_real, q_test)) {
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pr_warn("Test failed: flags = %u\n", flags);
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print_hex_dump(KERN_WARNING, "Input: ",
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DUMP_PREFIX_NONE, 16, 1, in, p - 1, true);
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print_hex_dump(KERN_WARNING, "Expected: ",
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DUMP_PREFIX_NONE, 16, 1, out_test, q_test, true);
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print_hex_dump(KERN_WARNING, "Got: ",
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DUMP_PREFIX_NONE, 16, 1, out_real, q_real, true);
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}
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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(i, false);
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test_string_unescape(get_random_int() % (UNESCAPE_ANY + 1), true);
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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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