cregit-Linux how code gets into the kernel

Release 4.15 lib/test_string.c

Directory: lib
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/string.h>


static __init int memset16_selftest(void) { unsigned i, j, k; u16 v, *p; p = kmalloc(256 * 2 * 2, GFP_KERNEL); if (!p) return -1; 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; }

Contributors

PersonTokensPropCommitsCommitProp
Geert Uytterhoeven203100.00%1100.00%
Total203100.00%1100.00%


static __init int memset32_selftest(void) { unsigned i, j, k; u32 v, *p; p = kmalloc(256 * 2 * 4, GFP_KERNEL); if (!p) return -1; 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; }

Contributors

PersonTokensPropCommitsCommitProp
Geert Uytterhoeven203100.00%1100.00%
Total203100.00%1100.00%


static __init int memset64_selftest(void) { unsigned i, j, k; u64 v, *p; p = kmalloc(256 * 2 * 8, GFP_KERNEL); if (!p) return -1; 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; }

Contributors

PersonTokensPropCommitsCommitProp
Geert Uytterhoeven203100.00%1100.00%
Total203100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Geert Uytterhoeven84100.00%1100.00%
Total84100.00%1100.00%

module_init(string_selftest_init); MODULE_LICENSE("GPL v2");

Overall Contributors

PersonTokensPropCommitsCommitProp
Geert Uytterhoeven715100.00%1100.00%
Total715100.00%1100.00%
Directory: lib
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