tools: Copy linux/{hash,poison}.h and check for drift
authorArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 18 Jul 2016 21:39:36 +0000 (18:39 -0300)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 18 Jul 2016 21:41:50 +0000 (18:41 -0300)
We were also using this directly from the kernel sources, the two last
cases, fix it.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-7o14xvacqcjc5llc7gvjjyl8@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/include/linux/hash.h
tools/include/linux/poison.h
tools/perf/MANIFEST
tools/perf/Makefile.perf

index d026c6573018b5fe5595265cef38d20b2cc4e5ec..ad6fa21d977b59fb938bde3c7e727deb24b28fca 100644 (file)
@@ -1,5 +1,104 @@
-#include "../../../include/linux/hash.h"
+#ifndef _LINUX_HASH_H
+#define _LINUX_HASH_H
+/* Fast hashing routine for ints,  longs and pointers.
+   (C) 2002 Nadia Yvette Chambers, IBM */
 
-#ifndef _TOOLS_LINUX_HASH_H
-#define _TOOLS_LINUX_HASH_H
+#include <asm/types.h>
+#include <linux/compiler.h>
+
+/*
+ * The "GOLDEN_RATIO_PRIME" is used in ifs/btrfs/brtfs_inode.h and
+ * fs/inode.c.  It's not actually prime any more (the previous primes
+ * were actively bad for hashing), but the name remains.
+ */
+#if BITS_PER_LONG == 32
+#define GOLDEN_RATIO_PRIME GOLDEN_RATIO_32
+#define hash_long(val, bits) hash_32(val, bits)
+#elif BITS_PER_LONG == 64
+#define hash_long(val, bits) hash_64(val, bits)
+#define GOLDEN_RATIO_PRIME GOLDEN_RATIO_64
+#else
+#error Wordsize not 32 or 64
+#endif
+
+/*
+ * This hash multiplies the input by a large odd number and takes the
+ * high bits.  Since multiplication propagates changes to the most
+ * significant end only, it is essential that the high bits of the
+ * product be used for the hash value.
+ *
+ * Chuck Lever verified the effectiveness of this technique:
+ * http://www.citi.umich.edu/techreports/reports/citi-tr-00-1.pdf
+ *
+ * Although a random odd number will do, it turns out that the golden
+ * ratio phi = (sqrt(5)-1)/2, or its negative, has particularly nice
+ * properties.  (See Knuth vol 3, section 6.4, exercise 9.)
+ *
+ * These are the negative, (1 - phi) = phi**2 = (3 - sqrt(5))/2,
+ * which is very slightly easier to multiply by and makes no
+ * difference to the hash distribution.
+ */
+#define GOLDEN_RATIO_32 0x61C88647
+#define GOLDEN_RATIO_64 0x61C8864680B583EBull
+
+#ifdef CONFIG_HAVE_ARCH_HASH
+/* This header may use the GOLDEN_RATIO_xx constants */
+#include <asm/hash.h>
+#endif
+
+/*
+ * The _generic versions exist only so lib/test_hash.c can compare
+ * the arch-optimized versions with the generic.
+ *
+ * Note that if you change these, any <asm/hash.h> that aren't updated
+ * to match need to have their HAVE_ARCH_* define values updated so the
+ * self-test will not false-positive.
+ */
+#ifndef HAVE_ARCH__HASH_32
+#define __hash_32 __hash_32_generic
+#endif
+static inline u32 __hash_32_generic(u32 val)
+{
+       return val * GOLDEN_RATIO_32;
+}
+
+#ifndef HAVE_ARCH_HASH_32
+#define hash_32 hash_32_generic
 #endif
+static inline u32 hash_32_generic(u32 val, unsigned int bits)
+{
+       /* High bits are more random, so use them. */
+       return __hash_32(val) >> (32 - bits);
+}
+
+#ifndef HAVE_ARCH_HASH_64
+#define hash_64 hash_64_generic
+#endif
+static __always_inline u32 hash_64_generic(u64 val, unsigned int bits)
+{
+#if BITS_PER_LONG == 64
+       /* 64x64-bit multiply is efficient on all 64-bit processors */
+       return val * GOLDEN_RATIO_64 >> (64 - bits);
+#else
+       /* Hash 64 bits using only 32x32-bit multiply. */
+       return hash_32((u32)val ^ __hash_32(val >> 32), bits);
+#endif
+}
+
+static inline u32 hash_ptr(const void *ptr, unsigned int bits)
+{
+       return hash_long((unsigned long)ptr, bits);
+}
+
+/* This really should be called fold32_ptr; it does no hashing to speak of. */
+static inline u32 hash32_ptr(const void *ptr)
+{
+       unsigned long val = (unsigned long)ptr;
+
+#if BITS_PER_LONG == 64
+       val ^= (val >> 32);
+#endif
+       return (u32)val;
+}
+
+#endif /* _LINUX_HASH_H */
index 0c27bdf142334570b0090b8c211f419ecccfbe5b..51334edec506815a70868dd451d5c72944ed0a59 100644 (file)
@@ -1 +1,90 @@
-#include "../../../include/linux/poison.h"
+#ifndef _LINUX_POISON_H
+#define _LINUX_POISON_H
+
+/********** include/linux/list.h **********/
+
+/*
+ * Architectures might want to move the poison pointer offset
+ * into some well-recognized area such as 0xdead000000000000,
+ * that is also not mappable by user-space exploits:
+ */
+#ifdef CONFIG_ILLEGAL_POINTER_VALUE
+# define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL)
+#else
+# define POISON_POINTER_DELTA 0
+#endif
+
+/*
+ * These are non-NULL pointers that will result in page faults
+ * under normal circumstances, used to verify that nobody uses
+ * non-initialized list entries.
+ */
+#define LIST_POISON1  ((void *) 0x100 + POISON_POINTER_DELTA)
+#define LIST_POISON2  ((void *) 0x200 + POISON_POINTER_DELTA)
+
+/********** include/linux/timer.h **********/
+/*
+ * Magic number "tsta" to indicate a static timer initializer
+ * for the object debugging code.
+ */
+#define TIMER_ENTRY_STATIC     ((void *) 0x300 + POISON_POINTER_DELTA)
+
+/********** mm/debug-pagealloc.c **********/
+#ifdef CONFIG_PAGE_POISONING_ZERO
+#define PAGE_POISON 0x00
+#else
+#define PAGE_POISON 0xaa
+#endif
+
+/********** mm/page_alloc.c ************/
+
+#define TAIL_MAPPING   ((void *) 0x400 + POISON_POINTER_DELTA)
+
+/********** mm/slab.c **********/
+/*
+ * Magic nums for obj red zoning.
+ * Placed in the first word before and the first word after an obj.
+ */
+#define        RED_INACTIVE    0x09F911029D74E35BULL   /* when obj is inactive */
+#define        RED_ACTIVE      0xD84156C5635688C0ULL   /* when obj is active */
+
+#define SLUB_RED_INACTIVE      0xbb
+#define SLUB_RED_ACTIVE                0xcc
+
+/* ...and for poisoning */
+#define        POISON_INUSE    0x5a    /* for use-uninitialised poisoning */
+#define POISON_FREE    0x6b    /* for use-after-free poisoning */
+#define        POISON_END      0xa5    /* end-byte of poisoning */
+
+/********** arch/$ARCH/mm/init.c **********/
+#define POISON_FREE_INITMEM    0xcc
+
+/********** arch/ia64/hp/common/sba_iommu.c **********/
+/*
+ * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
+ * value of "SBAIOMMU POISON\0" for spill-over poisoning.
+ */
+
+/********** fs/jbd/journal.c **********/
+#define JBD_POISON_FREE                0x5b
+#define JBD2_POISON_FREE       0x5c
+
+/********** drivers/base/dmapool.c **********/
+#define        POOL_POISON_FREED       0xa7    /* !inuse */
+#define        POOL_POISON_ALLOCATED   0xa9    /* !initted */
+
+/********** drivers/atm/ **********/
+#define ATM_POISON_FREE                0x12
+#define ATM_POISON             0xdeadbeef
+
+/********** kernel/mutexes **********/
+#define MUTEX_DEBUG_INIT       0x11
+#define MUTEX_DEBUG_FREE       0x22
+
+/********** lib/flex_array.c **********/
+#define FLEX_ARRAY_FREE        0x6c    /* for use-after-free poisoning */
+
+/********** security/ **********/
+#define KEY_DESTROY            0xbd
+
+#endif
index 3ac7f8dff47f24c49709a91cf393a4cd0760f313..ad2534df4ba6ce988429510b5c35360c253299cf 100644 (file)
@@ -77,6 +77,4 @@ tools/include/linux/stringify.h
 tools/include/linux/types.h
 tools/include/linux/err.h
 tools/include/linux/bitmap.h
-include/linux/hash.h
 tools/arch/*/include/uapi/asm/perf_regs.h
-include/linux/poison.h
index 580f4e208c7a1cc9cf5203602478ad3c3d5c0458..6641abb97f0ab8e81e805c3d9e95589369905c99 100644 (file)
@@ -351,6 +351,9 @@ $(PERF_IN): prepare FORCE
        @(test -f ../../include/uapi/linux/perf_event.h && ( \
         (diff -B ../include/uapi/linux/perf_event.h ../../include/uapi/linux/perf_event.h >/dev/null) \
         || echo "Warning: tools/include/uapi/linux/perf_event.h differs from kernel" >&2 )) || true
+       @(test -f ../../include/linux/hash.h && ( \
+        (diff -B ../include/linux/hash.h ../../include/linux/hash.h >/dev/null) \
+        || echo "Warning: tools/include/linux/hash.h differs from kernel" >&2 )) || true
        @(test -f ../../include/uapi/linux/hw_breakpoint.h && ( \
         (diff -B ../include/uapi/linux/hw_breakpoint.h ../../include/uapi/linux/hw_breakpoint.h >/dev/null) \
         || echo "Warning: tools/include/uapi/linux/hw_breakpoint.h differs from kernel" >&2 )) || true