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![Thierry Escande](/assets/img/avatar_default.png)
If the test_printf module is loaded before the crng is initialized, the plain 'p' tests will fail because the printed address will not be hashed and the buffer will contain '(ptrval)' instead. This patch adds a call to wait_for_random_bytes() before plain 'p' tests to make sure the crng is initialized. Link: http://lkml.kernel.org/r/20180604113708.11554-1-thierry.escande@linaro.org Signed-off-by: Thierry Escande <thierry.escande@linaro.org> Acked-by: Tobin C. Harding <me@tobin.cc> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: David Miller <davem@davemloft.net> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
551 lines
13 KiB
C
551 lines
13 KiB
C
/*
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* Test cases for printf facility.
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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/printk.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/bitmap.h>
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#include <linux/dcache.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/gfp.h>
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#include <linux/mm.h>
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#define BUF_SIZE 256
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#define PAD_SIZE 16
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#define FILL_CHAR '$'
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static unsigned total_tests __initdata;
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static unsigned failed_tests __initdata;
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static char *test_buffer __initdata;
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static char *alloced_buffer __initdata;
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static int __printf(4, 0) __init
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do_test(int bufsize, const char *expect, int elen,
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const char *fmt, va_list ap)
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{
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va_list aq;
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int ret, written;
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total_tests++;
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memset(alloced_buffer, FILL_CHAR, BUF_SIZE + 2*PAD_SIZE);
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va_copy(aq, ap);
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ret = vsnprintf(test_buffer, bufsize, fmt, aq);
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va_end(aq);
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if (ret != elen) {
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pr_warn("vsnprintf(buf, %d, \"%s\", ...) returned %d, expected %d\n",
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bufsize, fmt, ret, elen);
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return 1;
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}
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if (memchr_inv(alloced_buffer, FILL_CHAR, PAD_SIZE)) {
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pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote before buffer\n", bufsize, fmt);
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return 1;
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}
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if (!bufsize) {
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if (memchr_inv(test_buffer, FILL_CHAR, BUF_SIZE + PAD_SIZE)) {
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pr_warn("vsnprintf(buf, 0, \"%s\", ...) wrote to buffer\n",
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fmt);
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return 1;
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}
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return 0;
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}
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written = min(bufsize-1, elen);
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if (test_buffer[written]) {
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pr_warn("vsnprintf(buf, %d, \"%s\", ...) did not nul-terminate buffer\n",
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bufsize, fmt);
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return 1;
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}
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if (memchr_inv(test_buffer + written + 1, FILL_CHAR, BUF_SIZE + PAD_SIZE - (written + 1))) {
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pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote beyond the nul-terminator\n",
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bufsize, fmt);
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return 1;
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}
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if (memcmp(test_buffer, expect, written)) {
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pr_warn("vsnprintf(buf, %d, \"%s\", ...) wrote '%s', expected '%.*s'\n",
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bufsize, fmt, test_buffer, written, expect);
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return 1;
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}
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return 0;
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}
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static void __printf(3, 4) __init
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__test(const char *expect, int elen, const char *fmt, ...)
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{
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va_list ap;
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int rand;
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char *p;
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if (elen >= BUF_SIZE) {
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pr_err("error in test suite: expected output length %d too long. Format was '%s'.\n",
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elen, fmt);
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failed_tests++;
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return;
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}
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va_start(ap, fmt);
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/*
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* Every fmt+args is subjected to four tests: Three where we
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* tell vsnprintf varying buffer sizes (plenty, not quite
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* enough and 0), and then we also test that kvasprintf would
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* be able to print it as expected.
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*/
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failed_tests += do_test(BUF_SIZE, expect, elen, fmt, ap);
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rand = 1 + prandom_u32_max(elen+1);
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/* Since elen < BUF_SIZE, we have 1 <= rand <= BUF_SIZE. */
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failed_tests += do_test(rand, expect, elen, fmt, ap);
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failed_tests += do_test(0, expect, elen, fmt, ap);
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p = kvasprintf(GFP_KERNEL, fmt, ap);
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if (p) {
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total_tests++;
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if (memcmp(p, expect, elen+1)) {
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pr_warn("kvasprintf(..., \"%s\", ...) returned '%s', expected '%s'\n",
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fmt, p, expect);
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failed_tests++;
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}
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kfree(p);
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}
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va_end(ap);
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}
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#define test(expect, fmt, ...) \
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__test(expect, strlen(expect), fmt, ##__VA_ARGS__)
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static void __init
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test_basic(void)
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{
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/* Work around annoying "warning: zero-length gnu_printf format string". */
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char nul = '\0';
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test("", &nul);
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test("100%", "100%%");
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test("xxx%yyy", "xxx%cyyy", '%');
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__test("xxx\0yyy", 7, "xxx%cyyy", '\0');
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}
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static void __init
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test_number(void)
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{
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test("0x1234abcd ", "%#-12x", 0x1234abcd);
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test(" 0x1234abcd", "%#12x", 0x1234abcd);
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test("0|001| 12|+123| 1234|-123|-1234", "%d|%03d|%3d|%+d|% d|%+d|% d", 0, 1, 12, 123, 1234, -123, -1234);
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test("0|1|1|128|255", "%hhu|%hhu|%hhu|%hhu|%hhu", 0, 1, 257, 128, -1);
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test("0|1|1|-128|-1", "%hhd|%hhd|%hhd|%hhd|%hhd", 0, 1, 257, 128, -1);
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test("2015122420151225", "%ho%ho%#ho", 1037, 5282, -11627);
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/*
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* POSIX/C99: »The result of converting zero with an explicit
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* precision of zero shall be no characters.« Hence the output
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* from the below test should really be "00|0||| ". However,
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* the kernel's printf also produces a single 0 in that
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* case. This test case simply documents the current
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* behaviour.
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*/
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test("00|0|0|0|0", "%.2d|%.1d|%.0d|%.*d|%1.0d", 0, 0, 0, 0, 0, 0);
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#ifndef __CHAR_UNSIGNED__
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{
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/*
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* Passing a 'char' to a %02x specifier doesn't do
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* what was presumably the intention when char is
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* signed and the value is negative. One must either &
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* with 0xff or cast to u8.
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*/
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char val = -16;
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test("0xfffffff0|0xf0|0xf0", "%#02x|%#02x|%#02x", val, val & 0xff, (u8)val);
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}
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#endif
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}
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static void __init
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test_string(void)
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{
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test("", "%s%.0s", "", "123");
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test("ABCD|abc|123", "%s|%.3s|%.*s", "ABCD", "abcdef", 3, "123456");
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test("1 | 2|3 | 4|5 ", "%-3s|%3s|%-*s|%*s|%*s", "1", "2", 3, "3", 3, "4", -3, "5");
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test("1234 ", "%-10.4s", "123456");
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test(" 1234", "%10.4s", "123456");
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/*
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* POSIX and C99 say that a negative precision (which is only
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* possible to pass via a * argument) should be treated as if
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* the precision wasn't present, and that if the precision is
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* omitted (as in %.s), the precision should be taken to be
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* 0. However, the kernel's printf behave exactly opposite,
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* treating a negative precision as 0 and treating an omitted
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* precision specifier as if no precision was given.
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*
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* These test cases document the current behaviour; should
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* anyone ever feel the need to follow the standards more
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* closely, this can be revisited.
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*/
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test(" ", "%4.*s", -5, "123456");
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test("123456", "%.s", "123456");
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test("a||", "%.s|%.0s|%.*s", "a", "b", 0, "c");
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test("a | | ", "%-3.s|%-3.0s|%-3.*s", "a", "b", 0, "c");
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}
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#define PLAIN_BUF_SIZE 64 /* leave some space so we don't oops */
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#if BITS_PER_LONG == 64
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#define PTR_WIDTH 16
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#define PTR ((void *)0xffff0123456789abUL)
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#define PTR_STR "ffff0123456789ab"
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#define ZEROS "00000000" /* hex 32 zero bits */
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static int __init
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plain_format(void)
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{
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char buf[PLAIN_BUF_SIZE];
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int nchars;
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nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
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if (nchars != PTR_WIDTH || strncmp(buf, ZEROS, strlen(ZEROS)) != 0)
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return -1;
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return 0;
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}
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#else
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#define PTR_WIDTH 8
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#define PTR ((void *)0x456789ab)
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#define PTR_STR "456789ab"
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static int __init
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plain_format(void)
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{
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/* Format is implicitly tested for 32 bit machines by plain_hash() */
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return 0;
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}
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#endif /* BITS_PER_LONG == 64 */
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static int __init
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plain_hash(void)
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{
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char buf[PLAIN_BUF_SIZE];
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int nchars;
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nchars = snprintf(buf, PLAIN_BUF_SIZE, "%p", PTR);
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if (nchars != PTR_WIDTH || strncmp(buf, PTR_STR, PTR_WIDTH) == 0)
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return -1;
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return 0;
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}
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/*
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* We can't use test() to test %p because we don't know what output to expect
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* after an address is hashed.
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*/
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static void __init
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plain(void)
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{
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int err;
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/*
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* Make sure crng is ready. Otherwise we get "(ptrval)" instead
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* of a hashed address when printing '%p' in plain_hash() and
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* plain_format().
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*/
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wait_for_random_bytes();
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err = plain_hash();
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if (err) {
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pr_warn("plain 'p' does not appear to be hashed\n");
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failed_tests++;
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return;
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}
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err = plain_format();
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if (err) {
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pr_warn("hashing plain 'p' has unexpected format\n");
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failed_tests++;
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}
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}
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static void __init
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symbol_ptr(void)
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{
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}
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static void __init
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kernel_ptr(void)
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{
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/* We can't test this without access to kptr_restrict. */
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}
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static void __init
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struct_resource(void)
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{
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}
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static void __init
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addr(void)
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{
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}
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static void __init
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escaped_str(void)
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{
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}
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static void __init
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hex_string(void)
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{
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const char buf[3] = {0xc0, 0xff, 0xee};
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test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
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"%3ph|%3phC|%3phD|%3phN", buf, buf, buf, buf);
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test("c0 ff ee|c0:ff:ee|c0-ff-ee|c0ffee",
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"%*ph|%*phC|%*phD|%*phN", 3, buf, 3, buf, 3, buf, 3, buf);
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}
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static void __init
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mac(void)
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{
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const u8 addr[6] = {0x2d, 0x48, 0xd6, 0xfc, 0x7a, 0x05};
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test("2d:48:d6:fc:7a:05", "%pM", addr);
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test("05:7a:fc:d6:48:2d", "%pMR", addr);
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test("2d-48-d6-fc-7a-05", "%pMF", addr);
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test("2d48d6fc7a05", "%pm", addr);
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test("057afcd6482d", "%pmR", addr);
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}
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static void __init
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ip4(void)
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{
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struct sockaddr_in sa;
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sa.sin_family = AF_INET;
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sa.sin_port = cpu_to_be16(12345);
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sa.sin_addr.s_addr = cpu_to_be32(0x7f000001);
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test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
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test("127.000.000.001|127.0.0.1", "%piS|%pIS", &sa, &sa);
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sa.sin_addr.s_addr = cpu_to_be32(0x01020304);
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test("001.002.003.004:12345|1.2.3.4:12345", "%piSp|%pISp", &sa, &sa);
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}
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static void __init
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ip6(void)
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{
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}
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static void __init
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ip(void)
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{
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ip4();
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ip6();
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}
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static void __init
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uuid(void)
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{
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const char uuid[16] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
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0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
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test("00010203-0405-0607-0809-0a0b0c0d0e0f", "%pUb", uuid);
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test("00010203-0405-0607-0809-0A0B0C0D0E0F", "%pUB", uuid);
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test("03020100-0504-0706-0809-0a0b0c0d0e0f", "%pUl", uuid);
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test("03020100-0504-0706-0809-0A0B0C0D0E0F", "%pUL", uuid);
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}
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static struct dentry test_dentry[4] __initdata = {
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{ .d_parent = &test_dentry[0],
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.d_name = QSTR_INIT(test_dentry[0].d_iname, 3),
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.d_iname = "foo" },
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{ .d_parent = &test_dentry[0],
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.d_name = QSTR_INIT(test_dentry[1].d_iname, 5),
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.d_iname = "bravo" },
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{ .d_parent = &test_dentry[1],
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.d_name = QSTR_INIT(test_dentry[2].d_iname, 4),
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.d_iname = "alfa" },
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{ .d_parent = &test_dentry[2],
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.d_name = QSTR_INIT(test_dentry[3].d_iname, 5),
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.d_iname = "romeo" },
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};
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static void __init
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dentry(void)
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{
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test("foo", "%pd", &test_dentry[0]);
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test("foo", "%pd2", &test_dentry[0]);
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test("romeo", "%pd", &test_dentry[3]);
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test("alfa/romeo", "%pd2", &test_dentry[3]);
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test("bravo/alfa/romeo", "%pd3", &test_dentry[3]);
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test("/bravo/alfa/romeo", "%pd4", &test_dentry[3]);
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test("/bravo/alfa", "%pd4", &test_dentry[2]);
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test("bravo/alfa |bravo/alfa ", "%-12pd2|%*pd2", &test_dentry[2], -12, &test_dentry[2]);
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test(" bravo/alfa| bravo/alfa", "%12pd2|%*pd2", &test_dentry[2], 12, &test_dentry[2]);
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}
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static void __init
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struct_va_format(void)
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{
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}
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static void __init
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struct_clk(void)
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{
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}
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static void __init
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large_bitmap(void)
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{
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const int nbits = 1 << 16;
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unsigned long *bits = kcalloc(BITS_TO_LONGS(nbits), sizeof(long), GFP_KERNEL);
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if (!bits)
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return;
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bitmap_set(bits, 1, 20);
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bitmap_set(bits, 60000, 15);
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test("1-20,60000-60014", "%*pbl", nbits, bits);
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kfree(bits);
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}
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static void __init
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bitmap(void)
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{
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DECLARE_BITMAP(bits, 20);
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const int primes[] = {2,3,5,7,11,13,17,19};
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int i;
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bitmap_zero(bits, 20);
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test("00000|00000", "%20pb|%*pb", bits, 20, bits);
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test("|", "%20pbl|%*pbl", bits, 20, bits);
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for (i = 0; i < ARRAY_SIZE(primes); ++i)
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set_bit(primes[i], bits);
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test("a28ac|a28ac", "%20pb|%*pb", bits, 20, bits);
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test("2-3,5,7,11,13,17,19|2-3,5,7,11,13,17,19", "%20pbl|%*pbl", bits, 20, bits);
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bitmap_fill(bits, 20);
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test("fffff|fffff", "%20pb|%*pb", bits, 20, bits);
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test("0-19|0-19", "%20pbl|%*pbl", bits, 20, bits);
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large_bitmap();
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}
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static void __init
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netdev_features(void)
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{
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}
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static void __init
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flags(void)
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{
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unsigned long flags;
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gfp_t gfp;
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char *cmp_buffer;
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flags = 0;
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test("", "%pGp", &flags);
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/* Page flags should filter the zone id */
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flags = 1UL << NR_PAGEFLAGS;
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test("", "%pGp", &flags);
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flags |= 1UL << PG_uptodate | 1UL << PG_dirty | 1UL << PG_lru
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| 1UL << PG_active | 1UL << PG_swapbacked;
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test("uptodate|dirty|lru|active|swapbacked", "%pGp", &flags);
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|
|
|
|
|
flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC
|
|
| VM_DENYWRITE;
|
|
test("read|exec|mayread|maywrite|mayexec|denywrite", "%pGv", &flags);
|
|
|
|
gfp = GFP_TRANSHUGE;
|
|
test("GFP_TRANSHUGE", "%pGg", &gfp);
|
|
|
|
gfp = GFP_ATOMIC|__GFP_DMA;
|
|
test("GFP_ATOMIC|GFP_DMA", "%pGg", &gfp);
|
|
|
|
gfp = __GFP_ATOMIC;
|
|
test("__GFP_ATOMIC", "%pGg", &gfp);
|
|
|
|
cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
|
|
if (!cmp_buffer)
|
|
return;
|
|
|
|
/* Any flags not translated by the table should remain numeric */
|
|
gfp = ~__GFP_BITS_MASK;
|
|
snprintf(cmp_buffer, BUF_SIZE, "%#lx", (unsigned long) gfp);
|
|
test(cmp_buffer, "%pGg", &gfp);
|
|
|
|
snprintf(cmp_buffer, BUF_SIZE, "__GFP_ATOMIC|%#lx",
|
|
(unsigned long) gfp);
|
|
gfp |= __GFP_ATOMIC;
|
|
test(cmp_buffer, "%pGg", &gfp);
|
|
|
|
kfree(cmp_buffer);
|
|
}
|
|
|
|
static void __init
|
|
test_pointer(void)
|
|
{
|
|
plain();
|
|
symbol_ptr();
|
|
kernel_ptr();
|
|
struct_resource();
|
|
addr();
|
|
escaped_str();
|
|
hex_string();
|
|
mac();
|
|
ip();
|
|
uuid();
|
|
dentry();
|
|
struct_va_format();
|
|
struct_clk();
|
|
bitmap();
|
|
netdev_features();
|
|
flags();
|
|
}
|
|
|
|
static int __init
|
|
test_printf_init(void)
|
|
{
|
|
alloced_buffer = kmalloc(BUF_SIZE + 2*PAD_SIZE, GFP_KERNEL);
|
|
if (!alloced_buffer)
|
|
return -ENOMEM;
|
|
test_buffer = alloced_buffer + PAD_SIZE;
|
|
|
|
test_basic();
|
|
test_number();
|
|
test_string();
|
|
test_pointer();
|
|
|
|
kfree(alloced_buffer);
|
|
|
|
if (failed_tests == 0)
|
|
pr_info("all %u tests passed\n", total_tests);
|
|
else
|
|
pr_warn("failed %u out of %u tests\n", failed_tests, total_tests);
|
|
|
|
return failed_tests ? -EINVAL : 0;
|
|
}
|
|
|
|
module_init(test_printf_init);
|
|
|
|
MODULE_AUTHOR("Rasmus Villemoes <linux@rasmusvillemoes.dk>");
|
|
MODULE_LICENSE("GPL");
|