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linux-stable/lib/test-string_helpers.c
Chris Down 91027d0a7a string_helpers: Escape double quotes in escape_special 
From an abstract point of view, escape_special's counterpart,
unescape_special, already handles the unescaping of blackslashed double
quote sequences.

As a more practical example, printk indexing is an example case where
this is already practically useful. Compare an example with
`ESCAPE_SPECIAL | ESCAPE_SPACE`, with quotes not escaped:

    [root@ktst ~]# grep drivers/pci/pci-stub.c:69 /sys/kernel/debug/printk/index/vmlinux
    <4> drivers/pci/pci-stub.c:69 pci_stub_init "pci-stub: invalid ID string "%s"\n"

...and the same after this patch:

    [root@ktst ~]# grep drivers/pci/pci-stub.c:69 /sys/kernel/debug/printk/index/vmlinux
    <4> drivers/pci/pci-stub.c:69 pci_stub_init "pci-stub: invalid ID string \"%s\"\n"

One can of course, alternatively, use ESCAPE_APPEND with a quote in
@only, but without this patch quotes are coerced into hex or octal which
can hurt readability quite significantly.

I've checked uses of ESCAPE_SPECIAL and %pE across the codebase, and I'm
pretty confident that this shouldn't affect any stable interfaces.

Signed-off-by: Chris Down <chris@chrisdown.name>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/af144c5b75e41ce417386253ba2694456bc04118.1623775748.git.chris@chrisdown.name
2021-07-19 11:39:28 +02:00

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/*
* Test cases for lib/string_helpers.c module.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/string.h>
#include <linux/string_helpers.h>
static __init bool test_string_check_buf(const char *name, unsigned int flags,
char *in, size_t p,
char *out_real, size_t q_real,
char *out_test, size_t q_test)
{
if (q_real == q_test && !memcmp(out_test, out_real, q_test))
return true;
pr_warn("Test '%s' failed: flags = %#x\n", name, flags);
print_hex_dump(KERN_WARNING, "Input: ", DUMP_PREFIX_NONE, 16, 1,
in, p, true);
print_hex_dump(KERN_WARNING, "Expected: ", DUMP_PREFIX_NONE, 16, 1,
out_test, q_test, true);
print_hex_dump(KERN_WARNING, "Got: ", DUMP_PREFIX_NONE, 16, 1,
out_real, q_real, true);
return false;
}
struct test_string {
const char *in;
const char *out;
unsigned int flags;
};
static const struct test_string strings[] __initconst = {
{
.in = "\\f\\ \\n\\r\\t\\v",
.out = "\f\\ \n\r\t\v",
.flags = UNESCAPE_SPACE,
},
{
.in = "\\40\\1\\387\\0064\\05\\040\\8a\\110\\777",
.out = " \001\00387\0064\005 \\8aH?7",
.flags = UNESCAPE_OCTAL,
},
{
.in = "\\xv\\xa\\x2c\\xD\\x6f2",
.out = "\\xv\n,\ro2",
.flags = UNESCAPE_HEX,
},
{
.in = "\\h\\\\\\\"\\a\\e\\",
.out = "\\h\\\"\a\e\\",
.flags = UNESCAPE_SPECIAL,
},
};
static void __init test_string_unescape(const char *name, unsigned int flags,
bool inplace)
{
int q_real = 256;
char *in = kmalloc(q_real, GFP_KERNEL);
char *out_test = kmalloc(q_real, GFP_KERNEL);
char *out_real = kmalloc(q_real, GFP_KERNEL);
int i, p = 0, q_test = 0;
if (!in || !out_test || !out_real)
goto out;
for (i = 0; i < ARRAY_SIZE(strings); i++) {
const char *s = strings[i].in;
int len = strlen(strings[i].in);
/* Copy string to in buffer */
memcpy(&in[p], s, len);
p += len;
/* Copy expected result for given flags */
if (flags & strings[i].flags) {
s = strings[i].out;
len = strlen(strings[i].out);
}
memcpy(&out_test[q_test], s, len);
q_test += len;
}
in[p++] = '\0';
/* Call string_unescape and compare result */
if (inplace) {
memcpy(out_real, in, p);
if (flags == UNESCAPE_ANY)
q_real = string_unescape_any_inplace(out_real);
else
q_real = string_unescape_inplace(out_real, flags);
} else if (flags == UNESCAPE_ANY) {
q_real = string_unescape_any(in, out_real, q_real);
} else {
q_real = string_unescape(in, out_real, q_real, flags);
}
test_string_check_buf(name, flags, in, p - 1, out_real, q_real,
out_test, q_test);
out:
kfree(out_real);
kfree(out_test);
kfree(in);
}
struct test_string_1 {
const char *out;
unsigned int flags;
};
#define TEST_STRING_2_MAX_S1 32
struct test_string_2 {
const char *in;
struct test_string_1 s1[TEST_STRING_2_MAX_S1];
};
#define TEST_STRING_2_DICT_0 NULL
static const struct test_string_2 escape0[] __initconst = {{
.in = "\f\\ \n\r\t\v",
.s1 = {{
.out = "\\f\\ \\n\\r\\t\\v",
.flags = ESCAPE_SPACE,
},{
.out = "\\f\\134\\040\\n\\r\\t\\v",
.flags = ESCAPE_SPACE | ESCAPE_OCTAL,
},{
.out = "\\f\\x5c\\x20\\n\\r\\t\\v",
.flags = ESCAPE_SPACE | ESCAPE_HEX,
},{
/* terminator */
}}
},{
.in = "\\h\\\"\a\e\\",
.s1 = {{
.out = "\\\\h\\\\\\\"\\a\\e\\\\",
.flags = ESCAPE_SPECIAL,
},{
.out = "\\\\\\150\\\\\\\"\\a\\e\\\\",
.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL,
},{
.out = "\\\\\\x68\\\\\\\"\\a\\e\\\\",
.flags = ESCAPE_SPECIAL | ESCAPE_HEX,
},{
/* terminator */
}}
},{
.in = "\eb \\C\007\"\x90\r]",
.s1 = {{
.out = "\eb \\C\007\"\x90\\r]",
.flags = ESCAPE_SPACE,
},{
.out = "\\eb \\\\C\\a\\\"\x90\r]",
.flags = ESCAPE_SPECIAL,
},{
.out = "\\eb \\\\C\\a\\\"\x90\\r]",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL,
},{
.out = "\\033\\142\\040\\134\\103\\007\\042\\220\\015\\135",
.flags = ESCAPE_OCTAL,
},{
.out = "\\033\\142\\040\\134\\103\\007\\042\\220\\r\\135",
.flags = ESCAPE_SPACE | ESCAPE_OCTAL,
},{
.out = "\\e\\142\\040\\\\\\103\\a\\\"\\220\\015\\135",
.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL,
},{
.out = "\\e\\142\\040\\\\\\103\\a\\\"\\220\\r\\135",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_OCTAL,
},{
.out = "\eb \\C\007\"\x90\r]",
.flags = ESCAPE_NP,
},{
.out = "\eb \\C\007\"\x90\\r]",
.flags = ESCAPE_SPACE | ESCAPE_NP,
},{
.out = "\\eb \\C\\a\"\x90\r]",
.flags = ESCAPE_SPECIAL | ESCAPE_NP,
},{
.out = "\\eb \\C\\a\"\x90\\r]",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_NP,
},{
.out = "\\033b \\C\\007\"\\220\\015]",
.flags = ESCAPE_OCTAL | ESCAPE_NP,
},{
.out = "\\033b \\C\\007\"\\220\\r]",
.flags = ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_NP,
},{
.out = "\\eb \\C\\a\"\\220\\r]",
.flags = ESCAPE_SPECIAL | ESCAPE_SPACE | ESCAPE_OCTAL |
ESCAPE_NP,
},{
.out = "\\x1bb \\C\\x07\"\\x90\\x0d]",
.flags = ESCAPE_NP | ESCAPE_HEX,
},{
/* terminator */
}}
},{
.in = "\007 \eb\"\x90\xCF\r",
.s1 = {{
.out = "\007 \eb\"\\220\\317\r",
.flags = ESCAPE_OCTAL | ESCAPE_NA,
},{
.out = "\007 \eb\"\\x90\\xcf\r",
.flags = ESCAPE_HEX | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_NA,
},{
/* terminator */
}}
},{
/* terminator */
}};
#define TEST_STRING_2_DICT_1 "b\\ \t\r\xCF"
static const struct test_string_2 escape1[] __initconst = {{
.in = "\f\\ \n\r\t\v",
.s1 = {{
.out = "\f\\134\\040\n\\015\\011\v",
.flags = ESCAPE_OCTAL,
},{
.out = "\f\\x5c\\x20\n\\x0d\\x09\v",
.flags = ESCAPE_HEX,
},{
.out = "\f\\134\\040\n\\015\\011\v",
.flags = ESCAPE_ANY | ESCAPE_APPEND,
},{
.out = "\\014\\134\\040\\012\\015\\011\\013",
.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NAP,
},{
.out = "\\x0c\\x5c\\x20\\x0a\\x0d\\x09\\x0b",
.flags = ESCAPE_HEX | ESCAPE_APPEND | ESCAPE_NAP,
},{
.out = "\f\\134\\040\n\\015\\011\v",
.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NA,
},{
.out = "\f\\x5c\\x20\n\\x0d\\x09\v",
.flags = ESCAPE_HEX | ESCAPE_APPEND | ESCAPE_NA,
},{
/* terminator */
}}
},{
.in = "\\h\\\"\a\xCF\e\\",
.s1 = {{
.out = "\\134h\\134\"\a\\317\e\\134",
.flags = ESCAPE_OCTAL,
},{
.out = "\\134h\\134\"\a\\317\e\\134",
.flags = ESCAPE_ANY | ESCAPE_APPEND,
},{
.out = "\\134h\\134\"\\007\\317\\033\\134",
.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NAP,
},{
.out = "\\134h\\134\"\a\\317\e\\134",
.flags = ESCAPE_OCTAL | ESCAPE_APPEND | ESCAPE_NA,
},{
/* terminator */
}}
},{
.in = "\eb \\C\007\"\x90\r]",
.s1 = {{
.out = "\e\\142\\040\\134C\007\"\x90\\015]",
.flags = ESCAPE_OCTAL,
},{
/* terminator */
}}
},{
.in = "\007 \eb\"\x90\xCF\r",
.s1 = {{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_SPACE | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_SPECIAL | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\317\r",
.flags = ESCAPE_OCTAL | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\317\r",
.flags = ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\317\r",
.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\317\r",
.flags = ESCAPE_ANY | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\xcf\r",
.flags = ESCAPE_HEX | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\xcf\r",
.flags = ESCAPE_SPACE | ESCAPE_HEX | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\xcf\r",
.flags = ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NA,
},{
.out = "\007 \eb\"\x90\\xcf\r",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NA,
},{
/* terminator */
}}
},{
.in = "\007 \eb\"\x90\xCF\r",
.s1 = {{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\xCF\\r",
.flags = ESCAPE_SPACE | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\xCF\r",
.flags = ESCAPE_SPECIAL | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\xCF\\r",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\317\\015",
.flags = ESCAPE_OCTAL | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\317\\r",
.flags = ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\317\\015",
.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\317\r",
.flags = ESCAPE_ANY | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\xcf\\x0d",
.flags = ESCAPE_HEX | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\xcf\\r",
.flags = ESCAPE_SPACE | ESCAPE_HEX | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\xcf\\x0d",
.flags = ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NAP,
},{
.out = "\007 \eb\"\x90\\xcf\\r",
.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_HEX | ESCAPE_NAP,
},{
/* terminator */
}}
},{
/* terminator */
}};
static const struct test_string strings_upper[] __initconst = {
{
.in = "abcdefgh1234567890test",
.out = "ABCDEFGH1234567890TEST",
},
{
.in = "abCdeFgH1234567890TesT",
.out = "ABCDEFGH1234567890TEST",
},
};
static const struct test_string strings_lower[] __initconst = {
{
.in = "ABCDEFGH1234567890TEST",
.out = "abcdefgh1234567890test",
},
{
.in = "abCdeFgH1234567890TesT",
.out = "abcdefgh1234567890test",
},
};
static __init const char *test_string_find_match(const struct test_string_2 *s2,
unsigned int flags)
{
const struct test_string_1 *s1 = s2->s1;
unsigned int i;
if (!flags)
return s2->in;
/* Test cases are NULL-aware */
flags &= ~ESCAPE_NULL;
/* ESCAPE_OCTAL has a higher priority */
if (flags & ESCAPE_OCTAL)
flags &= ~ESCAPE_HEX;
for (i = 0; i < TEST_STRING_2_MAX_S1 && s1->out; i++, s1++)
if (s1->flags == flags)
return s1->out;
return NULL;
}
static __init void
test_string_escape_overflow(const char *in, int p, unsigned int flags, const char *esc,
int q_test, const char *name)
{
int q_real;
q_real = string_escape_mem(in, p, NULL, 0, flags, esc);
if (q_real != q_test)
pr_warn("Test '%s' failed: flags = %#x, osz = 0, expected %d, got %d\n",
name, flags, q_test, q_real);
}
static __init void test_string_escape(const char *name,
const struct test_string_2 *s2,
unsigned int flags, const char *esc)
{
size_t out_size = 512;
char *out_test = kmalloc(out_size, GFP_KERNEL);
char *out_real = kmalloc(out_size, GFP_KERNEL);
char *in = kmalloc(256, GFP_KERNEL);
int p = 0, q_test = 0;
int q_real;
if (!out_test || !out_real || !in)
goto out;
for (; s2->in; s2++) {
const char *out;
int len;
/* NULL injection */
if (flags & ESCAPE_NULL) {
in[p++] = '\0';
/* '\0' passes isascii() test */
if (flags & ESCAPE_NA && !(flags & ESCAPE_APPEND && esc)) {
out_test[q_test++] = '\0';
} else {
out_test[q_test++] = '\\';
out_test[q_test++] = '0';
}
}
/* Don't try strings that have no output */
out = test_string_find_match(s2, flags);
if (!out)
continue;
/* Copy string to in buffer */
len = strlen(s2->in);
memcpy(&in[p], s2->in, len);
p += len;
/* Copy expected result for given flags */
len = strlen(out);
memcpy(&out_test[q_test], out, len);
q_test += len;
}
q_real = string_escape_mem(in, p, out_real, out_size, flags, esc);
test_string_check_buf(name, flags, in, p, out_real, q_real, out_test,
q_test);
test_string_escape_overflow(in, p, flags, esc, q_test, name);
out:
kfree(in);
kfree(out_real);
kfree(out_test);
}
#define string_get_size_maxbuf 16
#define test_string_get_size_one(size, blk_size, exp_result10, exp_result2) \
do { \
BUILD_BUG_ON(sizeof(exp_result10) >= string_get_size_maxbuf); \
BUILD_BUG_ON(sizeof(exp_result2) >= string_get_size_maxbuf); \
__test_string_get_size((size), (blk_size), (exp_result10), \
(exp_result2)); \
} while (0)
static __init void test_string_get_size_check(const char *units,
const char *exp,
char *res,
const u64 size,
const u64 blk_size)
{
if (!memcmp(res, exp, strlen(exp) + 1))
return;
res[string_get_size_maxbuf - 1] = '\0';
pr_warn("Test 'test_string_get_size' failed!\n");
pr_warn("string_get_size(size = %llu, blk_size = %llu, units = %s)\n",
size, blk_size, units);
pr_warn("expected: '%s', got '%s'\n", exp, res);
}
static __init void __test_string_get_size(const u64 size, const u64 blk_size,
const char *exp_result10,
const char *exp_result2)
{
char buf10[string_get_size_maxbuf];
char buf2[string_get_size_maxbuf];
string_get_size(size, blk_size, STRING_UNITS_10, buf10, sizeof(buf10));
string_get_size(size, blk_size, STRING_UNITS_2, buf2, sizeof(buf2));
test_string_get_size_check("STRING_UNITS_10", exp_result10, buf10,
size, blk_size);
test_string_get_size_check("STRING_UNITS_2", exp_result2, buf2,
size, blk_size);
}
static __init void test_string_get_size(void)
{
/* small values */
test_string_get_size_one(0, 512, "0 B", "0 B");
test_string_get_size_one(1, 512, "512 B", "512 B");
test_string_get_size_one(1100, 1, "1.10 kB", "1.07 KiB");
/* normal values */
test_string_get_size_one(16384, 512, "8.39 MB", "8.00 MiB");
test_string_get_size_one(500118192, 512, "256 GB", "238 GiB");
test_string_get_size_one(8192, 4096, "33.6 MB", "32.0 MiB");
/* weird block sizes */
test_string_get_size_one(3000, 1900, "5.70 MB", "5.44 MiB");
/* huge values */
test_string_get_size_one(U64_MAX, 4096, "75.6 ZB", "64.0 ZiB");
test_string_get_size_one(4096, U64_MAX, "75.6 ZB", "64.0 ZiB");
}
static void __init test_string_upper_lower(void)
{
char *dst;
int i;
for (i = 0; i < ARRAY_SIZE(strings_upper); i++) {
const char *s = strings_upper[i].in;
int len = strlen(strings_upper[i].in) + 1;
dst = kmalloc(len, GFP_KERNEL);
if (!dst)
return;
string_upper(dst, s);
if (memcmp(dst, strings_upper[i].out, len)) {
pr_warn("Test 'string_upper' failed : expected %s, got %s!\n",
strings_upper[i].out, dst);
kfree(dst);
return;
}
kfree(dst);
}
for (i = 0; i < ARRAY_SIZE(strings_lower); i++) {
const char *s = strings_lower[i].in;
int len = strlen(strings_lower[i].in) + 1;
dst = kmalloc(len, GFP_KERNEL);
if (!dst)
return;
string_lower(dst, s);
if (memcmp(dst, strings_lower[i].out, len)) {
pr_warn("Test 'string_lower failed : : expected %s, got %s!\n",
strings_lower[i].out, dst);
kfree(dst);
return;
}
kfree(dst);
}
}
static int __init test_string_helpers_init(void)
{
unsigned int i;
pr_info("Running tests...\n");
for (i = 0; i < UNESCAPE_ALL_MASK + 1; i++)
test_string_unescape("unescape", i, false);
test_string_unescape("unescape inplace",
get_random_int() % (UNESCAPE_ANY + 1), true);
/* Without dictionary */
for (i = 0; i < ESCAPE_ALL_MASK + 1; i++)
test_string_escape("escape 0", escape0, i, TEST_STRING_2_DICT_0);
/* With dictionary */
for (i = 0; i < ESCAPE_ALL_MASK + 1; i++)
test_string_escape("escape 1", escape1, i, TEST_STRING_2_DICT_1);
/* Test string_get_size() */
test_string_get_size();
/* Test string upper(), string_lower() */
test_string_upper_lower();
return -EINVAL;
}
module_init(test_string_helpers_init);
MODULE_LICENSE("Dual BSD/GPL");
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