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authorLinus Torvalds2019-07-17 17:58:04 +0200
committerLinus Torvalds2019-07-17 17:58:04 +0200
commit57a8ec387e1441ea5e1232bc0749fb99a8cba7e7 (patch)
treeb5fb03fc6bc5754de8b5b1f8b0e4f36d67c8315c /lib
parentMerge tag 'for-linus-5.3-ofs1' of git://git.kernel.org/pub/scm/linux/kernel/g... (diff)
parentfs/select.c: use struct_size() in kmalloc() (diff)
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Merge branch 'akpm' (patches from Andrew)
Merge more updates from Andrew Morton: "VM: - z3fold fixes and enhancements by Henry Burns and Vitaly Wool - more accurate reclaimed slab caches calculations by Yafang Shao - fix MAP_UNINITIALIZED UAPI symbol to not depend on config, by Christoph Hellwig - !CONFIG_MMU fixes by Christoph Hellwig - new novmcoredd parameter to omit device dumps from vmcore, by Kairui Song - new test_meminit module for testing heap and pagealloc initialization, by Alexander Potapenko - ioremap improvements for huge mappings, by Anshuman Khandual - generalize kprobe page fault handling, by Anshuman Khandual - device-dax hotplug fixes and improvements, by Pavel Tatashin - enable synchronous DAX fault on powerpc, by Aneesh Kumar K.V - add pte_devmap() support for arm64, by Robin Murphy - unify locked_vm accounting with a helper, by Daniel Jordan - several misc fixes core/lib: - new typeof_member() macro including some users, by Alexey Dobriyan - make BIT() and GENMASK() available in asm, by Masahiro Yamada - changed LIST_POISON2 on x86_64 to 0xdead000000000122 for better code generation, by Alexey Dobriyan - rbtree code size optimizations, by Michel Lespinasse - convert struct pid count to refcount_t, by Joel Fernandes get_maintainer.pl: - add --no-moderated switch to skip moderated ML's, by Joe Perches misc: - ptrace PTRACE_GET_SYSCALL_INFO interface - coda updates - gdb scripts, various" [ Using merge message suggestion from Vlastimil Babka, with some editing - Linus ] * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (100 commits) fs/select.c: use struct_size() in kmalloc() mm: add account_locked_vm utility function arm64: mm: implement pte_devmap support mm: introduce ARCH_HAS_PTE_DEVMAP mm: clean up is_device_*_page() definitions mm/mmap: move common defines to mman-common.h mm: move MAP_SYNC to asm-generic/mman-common.h device-dax: "Hotremove" persistent memory that is used like normal RAM mm/hotplug: make remove_memory() interface usable device-dax: fix memory and resource leak if hotplug fails include/linux/lz4.h: fix spelling and copy-paste errors in documentation ipc/mqueue.c: only perform resource calculation if user valid include/asm-generic/bug.h: fix "cut here" for WARN_ON for __WARN_TAINT architectures scripts/gdb: add helpers to find and list devices scripts/gdb: add lx-genpd-summary command drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl kernel/pid.c: convert struct pid count to refcount_t drivers/rapidio/devices/rio_mport_cdev.c: NUL terminate some strings select: shift restore_saved_sigmask_unless() into poll_select_copy_remaining() select: change do_poll() to return -ERESTARTNOHAND rather than -EINTR ...
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug8
-rw-r--r--lib/Makefile1
-rw-r--r--lib/ioremap.c11
-rw-r--r--lib/mpi/longlong.h16
-rw-r--r--lib/rbtree.c40
-rw-r--r--lib/string.c11
-rw-r--r--lib/string_helpers.c77
-rw-r--r--lib/test_meminit.c364
-rw-r--r--lib/test_overflow.c11
-rw-r--r--lib/test_string.c83
10 files changed, 531 insertions, 91 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index a858b55e8ac7..bc6673ab3a08 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2076,6 +2076,14 @@ config TEST_STACKINIT
If unsure, say N.
+config TEST_MEMINIT
+ tristate "Test heap/page initialization"
+ help
+ Test if the kernel is zero-initializing heap and page allocations.
+ This can be useful to test init_on_alloc and init_on_free features.
+
+ If unsure, say N.
+
endif # RUNTIME_TESTING_MENU
config MEMTEST
diff --git a/lib/Makefile b/lib/Makefile
index fdd56bc219b8..59067f51f3ab 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -92,6 +92,7 @@ obj-$(CONFIG_TEST_MEMCAT_P) += test_memcat_p.o
obj-$(CONFIG_TEST_OBJAGG) += test_objagg.o
obj-$(CONFIG_TEST_STACKINIT) += test_stackinit.o
obj-$(CONFIG_TEST_BLACKHOLE_DEV) += test_blackhole_dev.o
+obj-$(CONFIG_TEST_MEMINIT) += test_meminit.o
obj-$(CONFIG_TEST_LIVEPATCH) += livepatch/
diff --git a/lib/ioremap.c b/lib/ioremap.c
index 063213685563..0a2ffadc6d71 100644
--- a/lib/ioremap.c
+++ b/lib/ioremap.c
@@ -30,6 +30,8 @@ early_param("nohugeiomap", set_nohugeiomap);
void __init ioremap_huge_init(void)
{
if (!ioremap_huge_disabled) {
+ if (arch_ioremap_p4d_supported())
+ ioremap_p4d_capable = 1;
if (arch_ioremap_pud_supported())
ioremap_pud_capable = 1;
if (arch_ioremap_pmd_supported())
@@ -86,6 +88,9 @@ static int ioremap_try_huge_pmd(pmd_t *pmd, unsigned long addr,
if ((end - addr) != PMD_SIZE)
return 0;
+ if (!IS_ALIGNED(addr, PMD_SIZE))
+ return 0;
+
if (!IS_ALIGNED(phys_addr, PMD_SIZE))
return 0;
@@ -126,6 +131,9 @@ static int ioremap_try_huge_pud(pud_t *pud, unsigned long addr,
if ((end - addr) != PUD_SIZE)
return 0;
+ if (!IS_ALIGNED(addr, PUD_SIZE))
+ return 0;
+
if (!IS_ALIGNED(phys_addr, PUD_SIZE))
return 0;
@@ -166,6 +174,9 @@ static int ioremap_try_huge_p4d(p4d_t *p4d, unsigned long addr,
if ((end - addr) != P4D_SIZE)
return 0;
+ if (!IS_ALIGNED(addr, P4D_SIZE))
+ return 0;
+
if (!IS_ALIGNED(phys_addr, P4D_SIZE))
return 0;
diff --git a/lib/mpi/longlong.h b/lib/mpi/longlong.h
index 08c60d10747f..3bb6260d8f42 100644
--- a/lib/mpi/longlong.h
+++ b/lib/mpi/longlong.h
@@ -397,8 +397,8 @@ do { \
#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
__asm__ ("addl %5,%1\n" \
"adcl %3,%0" \
- : "=r" ((USItype)(sh)), \
- "=&r" ((USItype)(sl)) \
+ : "=r" (sh), \
+ "=&r" (sl) \
: "%0" ((USItype)(ah)), \
"g" ((USItype)(bh)), \
"%1" ((USItype)(al)), \
@@ -406,22 +406,22 @@ do { \
#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
__asm__ ("subl %5,%1\n" \
"sbbl %3,%0" \
- : "=r" ((USItype)(sh)), \
- "=&r" ((USItype)(sl)) \
+ : "=r" (sh), \
+ "=&r" (sl) \
: "0" ((USItype)(ah)), \
"g" ((USItype)(bh)), \
"1" ((USItype)(al)), \
"g" ((USItype)(bl)))
#define umul_ppmm(w1, w0, u, v) \
__asm__ ("mull %3" \
- : "=a" ((USItype)(w0)), \
- "=d" ((USItype)(w1)) \
+ : "=a" (w0), \
+ "=d" (w1) \
: "%0" ((USItype)(u)), \
"rm" ((USItype)(v)))
#define udiv_qrnnd(q, r, n1, n0, d) \
__asm__ ("divl %4" \
- : "=a" ((USItype)(q)), \
- "=d" ((USItype)(r)) \
+ : "=a" (q), \
+ "=d" (r) \
: "0" ((USItype)(n0)), \
"1" ((USItype)(n1)), \
"rm" ((USItype)(d)))
diff --git a/lib/rbtree.c b/lib/rbtree.c
index 1ef6e25d031c..abc86c6a3177 100644
--- a/lib/rbtree.c
+++ b/lib/rbtree.c
@@ -83,14 +83,10 @@ __rb_rotate_set_parents(struct rb_node *old, struct rb_node *new,
static __always_inline void
__rb_insert(struct rb_node *node, struct rb_root *root,
- bool newleft, struct rb_node **leftmost,
void (*augment_rotate)(struct rb_node *old, struct rb_node *new))
{
struct rb_node *parent = rb_red_parent(node), *gparent, *tmp;
- if (newleft)
- *leftmost = node;
-
while (true) {
/*
* Loop invariant: node is red.
@@ -437,38 +433,19 @@ static const struct rb_augment_callbacks dummy_callbacks = {
void rb_insert_color(struct rb_node *node, struct rb_root *root)
{
- __rb_insert(node, root, false, NULL, dummy_rotate);
+ __rb_insert(node, root, dummy_rotate);
}
EXPORT_SYMBOL(rb_insert_color);
void rb_erase(struct rb_node *node, struct rb_root *root)
{
struct rb_node *rebalance;
- rebalance = __rb_erase_augmented(node, root,
- NULL, &dummy_callbacks);
+ rebalance = __rb_erase_augmented(node, root, &dummy_callbacks);
if (rebalance)
____rb_erase_color(rebalance, root, dummy_rotate);
}
EXPORT_SYMBOL(rb_erase);
-void rb_insert_color_cached(struct rb_node *node,
- struct rb_root_cached *root, bool leftmost)
-{
- __rb_insert(node, &root->rb_root, leftmost,
- &root->rb_leftmost, dummy_rotate);
-}
-EXPORT_SYMBOL(rb_insert_color_cached);
-
-void rb_erase_cached(struct rb_node *node, struct rb_root_cached *root)
-{
- struct rb_node *rebalance;
- rebalance = __rb_erase_augmented(node, &root->rb_root,
- &root->rb_leftmost, &dummy_callbacks);
- if (rebalance)
- ____rb_erase_color(rebalance, &root->rb_root, dummy_rotate);
-}
-EXPORT_SYMBOL(rb_erase_cached);
-
/*
* Augmented rbtree manipulation functions.
*
@@ -477,10 +454,9 @@ EXPORT_SYMBOL(rb_erase_cached);
*/
void __rb_insert_augmented(struct rb_node *node, struct rb_root *root,
- bool newleft, struct rb_node **leftmost,
void (*augment_rotate)(struct rb_node *old, struct rb_node *new))
{
- __rb_insert(node, root, newleft, leftmost, augment_rotate);
+ __rb_insert(node, root, augment_rotate);
}
EXPORT_SYMBOL(__rb_insert_augmented);
@@ -591,16 +567,6 @@ void rb_replace_node(struct rb_node *victim, struct rb_node *new,
}
EXPORT_SYMBOL(rb_replace_node);
-void rb_replace_node_cached(struct rb_node *victim, struct rb_node *new,
- struct rb_root_cached *root)
-{
- rb_replace_node(victim, new, &root->rb_root);
-
- if (root->rb_leftmost == victim)
- root->rb_leftmost = new;
-}
-EXPORT_SYMBOL(rb_replace_node_cached);
-
void rb_replace_node_rcu(struct rb_node *victim, struct rb_node *new,
struct rb_root *root)
{
diff --git a/lib/string.c b/lib/string.c
index 6016eb3ac73d..461fb620f85f 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -400,6 +400,9 @@ EXPORT_SYMBOL(strncmp);
* strchr - Find the first occurrence of a character in a string
* @s: The string to be searched
* @c: The character to search for
+ *
+ * Note that the %NUL-terminator is considered part of the string, and can
+ * be searched for.
*/
char *strchr(const char *s, int c)
{
@@ -453,12 +456,18 @@ EXPORT_SYMBOL(strrchr);
* @s: The string to be searched
* @count: The number of characters to be searched
* @c: The character to search for
+ *
+ * Note that the %NUL-terminator is considered part of the string, and can
+ * be searched for.
*/
char *strnchr(const char *s, size_t count, int c)
{
- for (; count-- && *s != '\0'; ++s)
+ while (count--) {
if (*s == (char)c)
return (char *)s;
+ if (*s++ == '\0')
+ break;
+ }
return NULL;
}
EXPORT_SYMBOL(strnchr);
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 3a90a9e2b94a..963050c0283e 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -231,35 +231,36 @@ static bool unescape_special(char **src, char **dst)
* @src: source buffer (escaped)
* @dst: destination buffer (unescaped)
* @size: size of the destination buffer (0 to unlimit)
- * @flags: combination of the flags (bitwise OR):
- * %UNESCAPE_SPACE:
+ * @flags: combination of the flags.
+ *
+ * Description:
+ * The function unquotes characters in the given string.
+ *
+ * Because the size of the output will be the same as or less than the size of
+ * the input, the transformation may be performed in place.
+ *
+ * Caller must provide valid source and destination pointers. Be aware that
+ * destination buffer will always be NULL-terminated. Source string must be
+ * NULL-terminated as well. The supported flags are::
+ *
+ * UNESCAPE_SPACE:
* '\f' - form feed
* '\n' - new line
* '\r' - carriage return
* '\t' - horizontal tab
* '\v' - vertical tab
- * %UNESCAPE_OCTAL:
+ * UNESCAPE_OCTAL:
* '\NNN' - byte with octal value NNN (1 to 3 digits)
- * %UNESCAPE_HEX:
+ * UNESCAPE_HEX:
* '\xHH' - byte with hexadecimal value HH (1 to 2 digits)
- * %UNESCAPE_SPECIAL:
+ * UNESCAPE_SPECIAL:
* '\"' - double quote
* '\\' - backslash
* '\a' - alert (BEL)
* '\e' - escape
- * %UNESCAPE_ANY:
+ * UNESCAPE_ANY:
* all previous together
*
- * Description:
- * The function unquotes characters in the given string.
- *
- * Because the size of the output will be the same as or less than the size of
- * the input, the transformation may be performed in place.
- *
- * Caller must provide valid source and destination pointers. Be aware that
- * destination buffer will always be NULL-terminated. Source string must be
- * NULL-terminated as well.
- *
* Return:
* The amount of the characters processed to the destination buffer excluding
* trailing '\0' is returned.
@@ -441,7 +442,29 @@ static bool escape_hex(unsigned char c, char **dst, char *end)
* @isz: source buffer size
* @dst: destination buffer (escaped)
* @osz: destination buffer size
- * @flags: combination of the flags (bitwise OR):
+ * @flags: combination of the flags
+ * @only: NULL-terminated string containing characters used to limit
+ * the selected escape class. If characters are included in @only
+ * that would not normally be escaped by the classes selected
+ * in @flags, they will be copied to @dst unescaped.
+ *
+ * Description:
+ * The process of escaping byte buffer includes several parts. They are applied
+ * in the following sequence.
+ *
+ * 1. The character is matched to the printable class, if asked, and in
+ * case of match it passes through to the output.
+ * 2. The character is not matched to the one from @only string and thus
+ * must go as-is to the output.
+ * 3. The character is checked if it falls into the class given by @flags.
+ * %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
+ * character. Note that they actually can't go together, otherwise
+ * %ESCAPE_HEX will be ignored.
+ *
+ * Caller must provide valid source and destination pointers. Be aware that
+ * destination buffer will not be NULL-terminated, thus caller have to append
+ * it if needs. The supported flags are::
+ *
* %ESCAPE_SPACE: (special white space, not space itself)
* '\f' - form feed
* '\n' - new line
@@ -464,26 +487,6 @@ static bool escape_hex(unsigned char c, char **dst, char *end)
* all previous together
* %ESCAPE_HEX:
* '\xHH' - byte with hexadecimal value HH (2 digits)
- * @only: NULL-terminated string containing characters used to limit
- * the selected escape class. If characters are included in @only
- * that would not normally be escaped by the classes selected
- * in @flags, they will be copied to @dst unescaped.
- *
- * Description:
- * The process of escaping byte buffer includes several parts. They are applied
- * in the following sequence.
- * 1. The character is matched to the printable class, if asked, and in
- * case of match it passes through to the output.
- * 2. The character is not matched to the one from @only string and thus
- * must go as-is to the output.
- * 3. The character is checked if it falls into the class given by @flags.
- * %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
- * character. Note that they actually can't go together, otherwise
- * %ESCAPE_HEX will be ignored.
- *
- * Caller must provide valid source and destination pointers. Be aware that
- * destination buffer will not be NULL-terminated, thus caller have to append
- * it if needs.
*
* Return:
* The total size of the escaped output that would be generated for
diff --git a/lib/test_meminit.c b/lib/test_meminit.c
new file mode 100644
index 000000000000..62d19f270cad
--- /dev/null
+++ b/lib/test_meminit.c
@@ -0,0 +1,364 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Test cases for SL[AOU]B/page initialization at alloc/free time.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/vmalloc.h>
+
+#define GARBAGE_INT (0x09A7BA9E)
+#define GARBAGE_BYTE (0x9E)
+
+#define REPORT_FAILURES_IN_FN() \
+ do { \
+ if (failures) \
+ pr_info("%s failed %d out of %d times\n", \
+ __func__, failures, num_tests); \
+ else \
+ pr_info("all %d tests in %s passed\n", \
+ num_tests, __func__); \
+ } while (0)
+
+/* Calculate the number of uninitialized bytes in the buffer. */
+static int __init count_nonzero_bytes(void *ptr, size_t size)
+{
+ int i, ret = 0;
+ unsigned char *p = (unsigned char *)ptr;
+
+ for (i = 0; i < size; i++)
+ if (p[i])
+ ret++;
+ return ret;
+}
+
+/* Fill a buffer with garbage, skipping |skip| first bytes. */
+static void __init fill_with_garbage_skip(void *ptr, int size, size_t skip)
+{
+ unsigned int *p = (unsigned int *)((char *)ptr + skip);
+ int i = 0;
+
+ WARN_ON(skip > size);
+ size -= skip;
+
+ while (size >= sizeof(*p)) {
+ p[i] = GARBAGE_INT;
+ i++;
+ size -= sizeof(*p);
+ }
+ if (size)
+ memset(&p[i], GARBAGE_BYTE, size);
+}
+
+static void __init fill_with_garbage(void *ptr, size_t size)
+{
+ fill_with_garbage_skip(ptr, size, 0);
+}
+
+static int __init do_alloc_pages_order(int order, int *total_failures)
+{
+ struct page *page;
+ void *buf;
+ size_t size = PAGE_SIZE << order;
+
+ page = alloc_pages(GFP_KERNEL, order);
+ buf = page_address(page);
+ fill_with_garbage(buf, size);
+ __free_pages(page, order);
+
+ page = alloc_pages(GFP_KERNEL, order);
+ buf = page_address(page);
+ if (count_nonzero_bytes(buf, size))
+ (*total_failures)++;
+ fill_with_garbage(buf, size);
+ __free_pages(page, order);
+ return 1;
+}
+
+/* Test the page allocator by calling alloc_pages with different orders. */
+static int __init test_pages(int *total_failures)
+{
+ int failures = 0, num_tests = 0;
+ int i;
+
+ for (i = 0; i < 10; i++)
+ num_tests += do_alloc_pages_order(i, &failures);
+
+ REPORT_FAILURES_IN_FN();
+ *total_failures += failures;
+ return num_tests;
+}
+
+/* Test kmalloc() with given parameters. */
+static int __init do_kmalloc_size(size_t size, int *total_failures)
+{
+ void *buf;
+
+ buf = kmalloc(size, GFP_KERNEL);
+ fill_with_garbage(buf, size);
+ kfree(buf);
+
+ buf = kmalloc(size, GFP_KERNEL);
+ if (count_nonzero_bytes(buf, size))
+ (*total_failures)++;
+ fill_with_garbage(buf, size);
+ kfree(buf);
+ return 1;
+}
+
+/* Test vmalloc() with given parameters. */
+static int __init do_vmalloc_size(size_t size, int *total_failures)
+{
+ void *buf;
+
+ buf = vmalloc(size);
+ fill_with_garbage(buf, size);
+ vfree(buf);
+
+ buf = vmalloc(size);
+ if (count_nonzero_bytes(buf, size))
+ (*total_failures)++;
+ fill_with_garbage(buf, size);
+ vfree(buf);
+ return 1;
+}
+
+/* Test kmalloc()/vmalloc() by allocating objects of different sizes. */
+static int __init test_kvmalloc(int *total_failures)
+{
+ int failures = 0, num_tests = 0;
+ int i, size;
+
+ for (i = 0; i < 20; i++) {
+ size = 1 << i;
+ num_tests += do_kmalloc_size(size, &failures);
+ num_tests += do_vmalloc_size(size, &failures);
+ }
+
+ REPORT_FAILURES_IN_FN();
+ *total_failures += failures;
+ return num_tests;
+}
+
+#define CTOR_BYTES (sizeof(unsigned int))
+#define CTOR_PATTERN (0x41414141)
+/* Initialize the first 4 bytes of the object. */
+static void test_ctor(void *obj)
+{
+ *(unsigned int *)obj = CTOR_PATTERN;
+}
+
+/*
+ * Check the invariants for the buffer allocated from a slab cache.
+ * If the cache has a test constructor, the first 4 bytes of the object must
+ * always remain equal to CTOR_PATTERN.
+ * If the cache isn't an RCU-typesafe one, or if the allocation is done with
+ * __GFP_ZERO, then the object contents must be zeroed after allocation.
+ * If the cache is an RCU-typesafe one, the object contents must never be
+ * zeroed after the first use. This is checked by memcmp() in
+ * do_kmem_cache_size().
+ */
+static bool __init check_buf(void *buf, int size, bool want_ctor,
+ bool want_rcu, bool want_zero)
+{
+ int bytes;
+ bool fail = false;
+
+ bytes = count_nonzero_bytes(buf, size);
+ WARN_ON(want_ctor && want_zero);
+ if (want_zero)
+ return bytes;
+ if (want_ctor) {
+ if (*(unsigned int *)buf != CTOR_PATTERN)
+ fail = 1;
+ } else {
+ if (bytes)
+ fail = !want_rcu;
+ }
+ return fail;
+}
+
+/*
+ * Test kmem_cache with given parameters:
+ * want_ctor - use a constructor;
+ * want_rcu - use SLAB_TYPESAFE_BY_RCU;
+ * want_zero - use __GFP_ZERO.
+ */
+static int __init do_kmem_cache_size(size_t size, bool want_ctor,
+ bool want_rcu, bool want_zero,
+ int *total_failures)
+{
+ struct kmem_cache *c;
+ int iter;
+ bool fail = false;
+ gfp_t alloc_mask = GFP_KERNEL | (want_zero ? __GFP_ZERO : 0);
+ void *buf, *buf_copy;
+
+ c = kmem_cache_create("test_cache", size, 1,
+ want_rcu ? SLAB_TYPESAFE_BY_RCU : 0,
+ want_ctor ? test_ctor : NULL);
+ for (iter = 0; iter < 10; iter++) {
+ buf = kmem_cache_alloc(c, alloc_mask);
+ /* Check that buf is zeroed, if it must be. */
+ fail = check_buf(buf, size, want_ctor, want_rcu, want_zero);
+ fill_with_garbage_skip(buf, size, want_ctor ? CTOR_BYTES : 0);
+
+ if (!want_rcu) {
+ kmem_cache_free(c, buf);
+ continue;
+ }
+
+ /*
+ * If this is an RCU cache, use a critical section to ensure we
+ * can touch objects after they're freed.
+ */
+ rcu_read_lock();
+ /*
+ * Copy the buffer to check that it's not wiped on
+ * free().
+ */
+ buf_copy = kmalloc(size, GFP_KERNEL);
+ if (buf_copy)
+ memcpy(buf_copy, buf, size);
+
+ kmem_cache_free(c, buf);
+ /*
+ * Check that |buf| is intact after kmem_cache_free().
+ * |want_zero| is false, because we wrote garbage to
+ * the buffer already.
+ */
+ fail |= check_buf(buf, size, want_ctor, want_rcu,
+ false);
+ if (buf_copy) {
+ fail |= (bool)memcmp(buf, buf_copy, size);
+ kfree(buf_copy);
+ }
+ rcu_read_unlock();
+ }
+ kmem_cache_destroy(c);
+
+ *total_failures += fail;
+ return 1;
+}
+
+/*
+ * Check that the data written to an RCU-allocated object survives
+ * reallocation.
+ */
+static int __init do_kmem_cache_rcu_persistent(int size, int *total_failures)
+{
+ struct kmem_cache *c;
+ void *buf, *buf_contents, *saved_ptr;
+ void **used_objects;
+ int i, iter, maxiter = 1024;
+ bool fail = false;
+
+ c = kmem_cache_create("test_cache", size, size, SLAB_TYPESAFE_BY_RCU,
+ NULL);
+ buf = kmem_cache_alloc(c, GFP_KERNEL);
+ saved_ptr = buf;
+ fill_with_garbage(buf, size);
+ buf_contents = kmalloc(size, GFP_KERNEL);
+ if (!buf_contents)
+ goto out;
+ used_objects = kmalloc_array(maxiter, sizeof(void *), GFP_KERNEL);
+ if (!used_objects) {
+ kfree(buf_contents);
+ goto out;
+ }
+ memcpy(buf_contents, buf, size);
+ kmem_cache_free(c, buf);
+ /*
+ * Run for a fixed number of iterations. If we never hit saved_ptr,
+ * assume the test passes.
+ */
+ for (iter = 0; iter < maxiter; iter++) {
+ buf = kmem_cache_alloc(c, GFP_KERNEL);
+ used_objects[iter] = buf;
+ if (buf == saved_ptr) {
+ fail = memcmp(buf_contents, buf, size);
+ for (i = 0; i <= iter; i++)
+ kmem_cache_free(c, used_objects[i]);
+ goto free_out;
+ }
+ }
+
+free_out:
+ kmem_cache_destroy(c);
+ kfree(buf_contents);
+ kfree(used_objects);
+out:
+ *total_failures += fail;
+ return 1;
+}
+
+/*
+ * Test kmem_cache allocation by creating caches of different sizes, with and
+ * without constructors, with and without SLAB_TYPESAFE_BY_RCU.
+ */
+static int __init test_kmemcache(int *total_failures)
+{
+ int failures = 0, num_tests = 0;
+ int i, flags, size;
+ bool ctor, rcu, zero;
+
+ for (i = 0; i < 10; i++) {
+ size = 8 << i;
+ for (flags = 0; flags < 8; flags++) {
+ ctor = flags & 1;
+ rcu = flags & 2;
+ zero = flags & 4;
+ if (ctor & zero)
+ continue;
+ num_tests += do_kmem_cache_size(size, ctor, rcu, zero,
+ &failures);
+ }
+ }
+ REPORT_FAILURES_IN_FN();
+ *total_failures += failures;
+ return num_tests;
+}
+
+/* Test the behavior of SLAB_TYPESAFE_BY_RCU caches of different sizes. */
+static int __init test_rcu_persistent(int *total_failures)
+{
+ int failures = 0, num_tests = 0;
+ int i, size;
+
+ for (i = 0; i < 10; i++) {
+ size = 8 << i;
+ num_tests += do_kmem_cache_rcu_persistent(size, &failures);
+ }
+ REPORT_FAILURES_IN_FN();
+ *total_failures += failures;
+ return num_tests;
+}
+
+/*
+ * Run the tests. Each test function returns the number of executed tests and
+ * updates |failures| with the number of failed tests.
+ */
+static int __init test_meminit_init(void)
+{
+ int failures = 0, num_tests = 0;
+
+ num_tests += test_pages(&failures);
+ num_tests += test_kvmalloc(&failures);
+ num_tests += test_kmemcache(&failures);
+ num_tests += test_rcu_persistent(&failures);
+
+ if (failures == 0)
+ pr_info("all %d tests passed!\n", num_tests);
+ else
+ pr_info("failures: %d out of %d\n", failures, num_tests);
+
+ return failures ? -EINVAL : 0;
+}
+module_init(test_meminit_init);
+
+MODULE_LICENSE("GPL");
diff --git a/lib/test_overflow.c b/lib/test_overflow.c
index fc680562d8b6..7a4b6f6c5473 100644
--- a/lib/test_overflow.c
+++ b/lib/test_overflow.c
@@ -486,16 +486,17 @@ static int __init test_overflow_shift(void)
* Deal with the various forms of allocator arguments. See comments above
* the DEFINE_TEST_ALLOC() instances for mapping of the "bits".
*/
-#define alloc010(alloc, arg, sz) alloc(sz, GFP_KERNEL)
-#define alloc011(alloc, arg, sz) alloc(sz, GFP_KERNEL, NUMA_NO_NODE)
+#define alloc_GFP (GFP_KERNEL | __GFP_NOWARN)
+#define alloc010(alloc, arg, sz) alloc(sz, alloc_GFP)
+#define alloc011(alloc, arg, sz) alloc(sz, alloc_GFP, NUMA_NO_NODE)
#define alloc000(alloc, arg, sz) alloc(sz)
#define alloc001(alloc, arg, sz) alloc(sz, NUMA_NO_NODE)
-#define alloc110(alloc, arg, sz) alloc(arg, sz, GFP_KERNEL)
+#define alloc110(alloc, arg, sz) alloc(arg, sz, alloc_GFP)
#define free0(free, arg, ptr) free(ptr)
#define free1(free, arg, ptr) free(arg, ptr)
-/* Wrap around to 8K */
-#define TEST_SIZE (9 << PAGE_SHIFT)
+/* Wrap around to 16K */
+#define TEST_SIZE (5 * 4096)
#define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\
static int __init test_ ## func (void *arg) \
diff --git a/lib/test_string.c b/lib/test_string.c
index bf8def01ed20..7b31f4a505bf 100644
--- a/lib/test_string.c
+++ b/lib/test_string.c
@@ -36,7 +36,7 @@ static __init int memset16_selftest(void)
fail:
kfree(p);
if (i < 256)
- return (i << 24) | (j << 16) | k;
+ return (i << 24) | (j << 16) | k | 0x8000;
return 0;
}
@@ -72,7 +72,7 @@ static __init int memset32_selftest(void)
fail:
kfree(p);
if (i < 256)
- return (i << 24) | (j << 16) | k;
+ return (i << 24) | (j << 16) | k | 0x8000;
return 0;
}
@@ -108,7 +108,74 @@ static __init int memset64_selftest(void)
fail:
kfree(p);
if (i < 256)
- return (i << 24) | (j << 16) | k;
+ return (i << 24) | (j << 16) | k | 0x8000;
+ return 0;
+}
+
+static __init int strchr_selftest(void)
+{
+ const char *test_string = "abcdefghijkl";
+ const char *empty_string = "";
+ char *result;
+ int i;
+
+ for (i = 0; i < strlen(test_string) + 1; i++) {
+ result = strchr(test_string, test_string[i]);
+ if (result - test_string != i)
+ return i + 'a';
+ }
+
+ result = strchr(empty_string, '\0');
+ if (result != empty_string)
+ return 0x101;
+
+ result = strchr(empty_string, 'a');
+ if (result)
+ return 0x102;
+
+ result = strchr(test_string, 'z');
+ if (result)
+ return 0x103;
+
+ return 0;
+}
+
+static __init int strnchr_selftest(void)
+{
+ const char *test_string = "abcdefghijkl";
+ const char *empty_string = "";
+ char *result;
+ int i, j;
+
+ for (i = 0; i < strlen(test_string) + 1; i++) {
+ for (j = 0; j < strlen(test_string) + 2; j++) {
+ result = strnchr(test_string, j, test_string[i]);
+ if (j <= i) {
+ if (!result)
+ continue;
+ return ((i + 'a') << 8) | j;
+ }
+ if (result - test_string != i)
+ return ((i + 'a') << 8) | j;
+ }
+ }
+
+ result = strnchr(empty_string, 0, '\0');
+ if (result)
+ return 0x10001;
+
+ result = strnchr(empty_string, 1, '\0');
+ if (result != empty_string)
+ return 0x10002;
+
+ result = strnchr(empty_string, 1, 'a');
+ if (result)
+ return 0x10003;
+
+ result = strnchr(NULL, 0, '\0');
+ if (result)
+ return 0x10004;
+
return 0;
}
@@ -131,6 +198,16 @@ static __init int string_selftest_init(void)
if (subtest)
goto fail;
+ test = 4;
+ subtest = strchr_selftest();
+ if (subtest)
+ goto fail;
+
+ test = 5;
+ subtest = strnchr_selftest();
+ if (subtest)
+ goto fail;
+
pr_info("String selftests succeeded\n");
return 0;
fail: