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-rw-r--r--lib/Kconfig3
-rw-r--r--lib/string.c129
2 files changed, 132 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 6762529ad9e4..40b114a11d7c 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -575,4 +575,7 @@ config PARMAN
config PRIME_NUMBERS
tristate
+config STRING_SELFTEST
+ bool "Test string functions"
+
endmenu
diff --git a/lib/string.c b/lib/string.c
index 198148bb61fd..abf6499e3915 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -1051,3 +1051,132 @@ void fortify_panic(const char *name)
BUG();
}
EXPORT_SYMBOL(fortify_panic);
+
+#ifdef CONFIG_STRING_SELFTEST
+#include <linux/slab.h>
+#include <linux/module.h>
+
+static __init int memset16_selftest(void)
+{
+ unsigned i, j, k;
+ u16 v, *p = kmalloc(256 * 2 * 2, GFP_KERNEL);
+
+ for (i = 0; i < 256; i++) {
+ for (j = 0; j < 256; j++) {
+ memset(p, 0xa1, 256 * 2 * sizeof(v));
+ memset16(p + i, 0xb1b2, j);
+ for (k = 0; k < 512; k++) {
+ v = p[k];
+ if (k < i) {
+ if (v != 0xa1a1)
+ goto fail;
+ } else if (k < i + j) {
+ if (v != 0xb1b2)
+ goto fail;
+ } else {
+ if (v != 0xa1a1)
+ goto fail;
+ }
+ }
+ }
+ }
+
+fail:
+ kfree(p);
+ if (i < 256)
+ return (i << 24) | (j << 16) | k;
+ return 0;
+}
+
+static __init int memset32_selftest(void)
+{
+ unsigned i, j, k;
+ u32 v, *p = kmalloc(256 * 2 * 4, GFP_KERNEL);
+
+ for (i = 0; i < 256; i++) {
+ for (j = 0; j < 256; j++) {
+ memset(p, 0xa1, 256 * 2 * sizeof(v));
+ memset32(p + i, 0xb1b2b3b4, j);
+ for (k = 0; k < 512; k++) {
+ v = p[k];
+ if (k < i) {
+ if (v != 0xa1a1a1a1)
+ goto fail;
+ } else if (k < i + j) {
+ if (v != 0xb1b2b3b4)
+ goto fail;
+ } else {
+ if (v != 0xa1a1a1a1)
+ goto fail;
+ }
+ }
+ }
+ }
+
+fail:
+ kfree(p);
+ if (i < 256)
+ return (i << 24) | (j << 16) | k;
+ return 0;
+}
+
+static __init int memset64_selftest(void)
+{
+ unsigned i, j, k;
+ u64 v, *p = kmalloc(256 * 2 * 8, GFP_KERNEL);
+
+ for (i = 0; i < 256; i++) {
+ for (j = 0; j < 256; j++) {
+ memset(p, 0xa1, 256 * 2 * sizeof(v));
+ memset64(p + i, 0xb1b2b3b4b5b6b7b8ULL, j);
+ for (k = 0; k < 512; k++) {
+ v = p[k];
+ if (k < i) {
+ if (v != 0xa1a1a1a1a1a1a1a1ULL)
+ goto fail;
+ } else if (k < i + j) {
+ if (v != 0xb1b2b3b4b5b6b7b8ULL)
+ goto fail;
+ } else {
+ if (v != 0xa1a1a1a1a1a1a1a1ULL)
+ goto fail;
+ }
+ }
+ }
+ }
+
+fail:
+ kfree(p);
+ if (i < 256)
+ return (i << 24) | (j << 16) | k;
+ return 0;
+}
+
+static __init int string_selftest_init(void)
+{
+ int test, subtest;
+
+ test = 1;
+ subtest = memset16_selftest();
+ if (subtest)
+ goto fail;
+
+ test = 2;
+ subtest = memset32_selftest();
+ if (subtest)
+ goto fail;
+
+ test = 3;
+ subtest = memset64_selftest();
+ if (subtest)
+ goto fail;
+
+ pr_info("String selftests succeeded\n");
+ return 0;
+fail:
+ pr_crit("String selftest failure %d.%08x\n", test, subtest);
+ return 0;
+}
+
+module_init(string_selftest_init);
+#endif /* CONFIG_STRING_SELFTEST */